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Revision 423 - (hide annotations) (download)
Sat Aug 15 18:17:31 2009 UTC (5 years, 8 months ago) by ph10
File size: 167300 byte(s)
Add libpcreposix.pc for pkg-config, which was missing.

1 nigel 3 ChangeLog for PCRE
2     ------------------
4 ph10 418 Version 8.00 ??-???-??
5     ----------------------
7     1. The table for translating pcre_compile() error codes into POSIX error codes
8     was out-of-date, and there was no check on the pcre_compile() error code
9     being within the table. This could lead to an OK return being given in
10     error.
11 ph10 419
12     2. Changed the call to open a subject file in pcregrep from fopen(pathname,
13     "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
14     in a Windows environment.
15 ph10 420
16     3. The pcregrep --count option prints the count for each file even when it is
17     zero, as does GNU grep. However, pcregrep was also printing all files when
18     --files-with-matches was added. Now, when both options are given, it prints
19     counts only for those files that have at least one match. (GNU grep just
20     prints the file name in this circumstance, but including the count seems
21     more useful - otherwise, why use --count?) Also ensured that the
22     combination -clh just lists non-zero counts, with no names.
24 ph10 421 4. The long form of the pcregrep -F option was incorrectly implemented as
25     --fixed_strings instead of --fixed-strings. This is an incompatible change,
26     but it seems right to fix it, and I didn't think it was worth preserving
27     the old behaviour.
29 ph10 422 5. The command line items --regex=pattern and --regexp=pattern were not
30     recognized by pcregrep, which required --regex pattern or --regexp pattern
31     (with a space rather than an '='). The man page documented the '=' forms,
32     which are compatible with GNU grep; these now work.
34 ph10 423 6. No libpcreposix.pc file was created for pkg-config; there was just
35     libpcre.pc and libpcrecpp.pc. The omission has been rectified.
37 ph10 418
38 ph10 412 Version 7.9 11-Apr-09
39 ph10 376 ---------------------
41 ph10 392 1. When building with support for bzlib/zlib (pcregrep) and/or readline
42 ph10 376 (pcretest), all targets were linked against these libraries. This included
43     libpcre, libpcreposix, and libpcrecpp, even though they do not use these
44     libraries. This caused unwanted dependencies to be created. This problem
45 ph10 392 has been fixed, and now only pcregrep is linked with bzlib/zlib and only
46 ph10 376 pcretest is linked with readline.
47 ph10 392
48 ph10 376 2. The "typedef int BOOL" in pcre_internal.h that was included inside the
49     "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
50     moved outside it again, because FALSE and TRUE are already defined in AIX,
51     but BOOL is not.
52 ph10 392
53     3. The pcre_config() function was treating the PCRE_MATCH_LIMIT and
54 ph10 409 PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
55 ph10 392
56 ph10 376 4. The pcregrep documentation said spaces were inserted as well as colons (or
57     hyphens) following file names and line numbers when outputting matching
58 ph10 392 lines. This is not true; no spaces are inserted. I have also clarified the
59 ph10 376 wording for the --colour (or --color) option.
60 ph10 392
61 ph10 378 5. In pcregrep, when --colour was used with -o, the list of matching strings
62     was not coloured; this is different to GNU grep, so I have changed it to be
63     the same.
64 ph10 392
65 ph10 378 6. When --colo(u)r was used in pcregrep, only the first matching substring in
66 ph10 392 each matching line was coloured. Now it goes on to look for further matches
67     of any of the test patterns, which is the same behaviour as GNU grep.
69     7. A pattern that could match an empty string could cause pcregrep to loop; it
70     doesn't make sense to accept an empty string match in pcregrep, so I have
71 ph10 379 locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
72     seems to be how GNU grep behaves.
73 ph10 392
74 ph10 380 8. The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
75 ph10 392 start or after a newline", because the conditional assertion was not being
76     correctly handled. The rule now is that both the assertion and what follows
77     in the first alternative must satisfy the test.
79 ph10 405 9. If auto-callout was enabled in a pattern with a conditional group whose
80 ph10 399 condition was an assertion, PCRE could crash during matching, both with
81     pcre_exec() and pcre_dfa_exec().
82 ph10 392
83     10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
84     used for matching.
86     11. Unicode property support in character classes was not working for
87 ph10 385 characters (bytes) greater than 127 when not in UTF-8 mode.
88 ph10 388
89 ph10 392 12. Added the -M command line option to pcretest.
91 ph10 388 14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
92 ph10 389
93     15. Added the PCRE_NO_START_OPTIMIZE match-time option.
94 ph10 390
95 ph10 392 16. Added comments and documentation about mis-use of no_arg in the C++
96 ph10 390 wrapper.
97 ph10 392
98 ph10 391 17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
99 ph10 392 from Martin Jerabek that uses macro names for all relevant character and
100 ph10 391 string constants.
101 ph10 405
102 ph10 393 18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
103     SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
104 ph10 405 SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
105     these, but not everybody uses configure.
107     19. A conditional group that had only one branch was not being correctly
108     recognized as an item that could match an empty string. This meant that an
109     enclosing group might also not be so recognized, causing infinite looping
110     (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
111     with the subject "ab", where knowledge that the repeated group can match
112 ph10 396 nothing is needed in order to break the loop.
113 ph10 405
114 ph10 397 20. If a pattern that was compiled with callouts was matched using pcre_dfa_
115 ph10 405 exec(), but without supplying a callout function, matching went wrong.
117     21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
118     leak if the size of the offset vector was greater than 30. When the vector
119     is smaller, the saved offsets during recursion go onto a local stack
120     vector, but for larger vectors malloc() is used. It was failing to free
121     when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
122 ph10 400 error, in fact).
123 ph10 405
124 ph10 402 22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
125 ph10 405 heapframe that is used only when UTF-8 support is enabled. This caused no
126     problem, but was untidy.
127 ph10 376
128 ph10 405 23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
129     CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
130     included within another project.
131 ph10 411
132 ph10 407 24. Steven Van Ingelgem's patches to add more options to the CMake support,
133     slightly modified by me:
134 ph10 411
135     (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
136     not building pcregrep.
138 ph10 407 (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
139 ph10 411 if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
141 ph10 408 25. Forward references, both numeric and by name, in patterns that made use of
142     duplicate group numbers, could behave incorrectly or give incorrect errors,
143     because when scanning forward to find the reference group, PCRE was not
144     taking into account the duplicate group numbers. A pattern such as
145     ^X(?3)(a)(?|(b)|(q))(Y) is an example.
146 ph10 411
147     26. Changed a few more instances of "const unsigned char *" to USPTR, making
148     the feature of a custom pointer more persuasive (as requested by a user).
149 ph10 416
150 ph10 411 27. Wrapped the definitions of fileno and isatty for Windows, which appear in
151 ph10 416 pcretest.c, inside #ifndefs, because it seems they are sometimes already
152     pre-defined.
153 ph10 392
154 ph10 416 28. Added support for (*UTF8) at the start of a pattern.
156 ph10 413 29. Arrange for flags added by the "release type" setting in CMake to be shown
157     in the configuration summary.
158 ph10 405
159 ph10 411
160 ph10 374 Version 7.8 05-Sep-08
161 ph10 349 ---------------------
163     1. Replaced UCP searching code with optimized version as implemented for Ad
164     Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
165 ph10 351 stage table and inline lookup instead of a function, giving speed ups of 2
166     to 5 times on some simple patterns that I tested. Permission was given to
167     distribute the MultiStage2.py script that generates the tables (it's not in
168     the tarball, but is in the Subversion repository).
169 ph10 349
170 ph10 351 2. Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
171     scripts.
172 ph10 358
173 ph10 353 3. Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
174     a group with a zero qualifier. The result of the study could be incorrect,
175 ph10 358 or the function might crash, depending on the pattern.
177     4. Caseless matching was not working for non-ASCII characters in back
178 ph10 354 references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
179 ph10 358 It now works when Unicode Property Support is available.
181 ph10 355 5. In pcretest, an escape such as \x{de} in the data was always generating
182     a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
183     non-UTF-8 mode. If the value is greater than 255, it gives a warning about
184 ph10 358 truncation.
185 ph10 349
186 ph10 358 6. Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
188 ph10 357 7. Added two (int) casts to pcregrep when printing the difference of two
189     pointers, in case they are 64-bit values.
190 ph10 371
191     8. Added comments about Mac OS X stack usage to the pcrestack man page and to
192     test 2 if it fails.
194 ph10 359 9. Added PCRE_CALL_CONVENTION just before the names of all exported functions,
195 ph10 371 and a #define of that name to empty if it is not externally set. This is to
196     allow users of MSVC to set it if necessary.
198     10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
199 ph10 359 the convenience functions in the pcre_get.c source file.
200 ph10 371
201 ph10 360 11. An option change at the start of a pattern that had top-level alternatives
202     could cause overwriting and/or a crash. This command provoked a crash in
203 ph10 371 some environments:
205     printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
207 ph10 360 This potential security problem was recorded as CVE-2008-2371.
208 ph10 371
209 ph10 361 12. For a pattern where the match had to start at the beginning or immediately
210     after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
211 ph10 371 pcre_dfa_exec() could read past the end of the passed subject if there was
212 ph10 361 no match. To help with detecting such bugs (e.g. with valgrind), I modified
213     pcretest so that it places the subject at the end of its malloc-ed buffer.
214 ph10 371
215 ph10 364 13. The change to pcretest in 12 above threw up a couple more cases when pcre_
216 ph10 371 exec() might read past the end of the data buffer in UTF-8 mode.
218 ph10 364 14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
219 ph10 371 the data contained the byte 0x85 as part of a UTF-8 character within its
220     first line. This applied both to normal and DFA matching.
222 ph10 366 15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
223 ph10 371 /^[^d]*?$/8 failed to match "abc".
224 ph10 351
225 ph10 371 16. Added a missing copyright notice to pcrecpp_internal.h.
227     17. Make it more clear in the documentation that values returned from
228 ph10 368 pcre_exec() in ovector are byte offsets, not character counts.
229 ph10 357
230 ph10 371 18. Tidied a few places to stop certain compilers from issuing warnings.
231 ph10 368
232 ph10 373 19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
233     supplied by Stefan Weber. I made a further small update for 7.8 because
234 ph10 374 there is a change of source arrangements: the pcre_searchfuncs.c module is
235     replaced by pcre_ucd.c.
236 ph10 371
237 ph10 373
238 ph10 347 Version 7.7 07-May-08
239 ph10 321 ---------------------
241     1. Applied Craig's patch to sort out a long long problem: "If we can't convert
242 ph10 345 a string to a long long, pretend we don't even have a long long." This is
243 ph10 321 done by checking for the strtoq, strtoll, and _strtoi64 functions.
244 ph10 345
245 ph10 322 2. Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
246     pre-7.6 versions, which defined a global no_arg variable instead of putting
247 ph10 332 it in the RE class. (See also #8 below.)
248 ph10 345
249     3. Remove a line of dead code, identified by coverity and reported by Nuno
250     Lopes.
252 ph10 324 4. Fixed two related pcregrep bugs involving -r with --include or --exclude:
253 ph10 321
254 ph10 324 (1) The include/exclude patterns were being applied to the whole pathnames
255 ph10 345 of files, instead of just to the final components.
257 ph10 324 (2) If there was more than one level of directory, the subdirectories were
258     skipped unless they satisfied the include/exclude conditions. This is
259     inconsistent with GNU grep (and could even be seen as contrary to the
260     pcregrep specification - which I improved to make it absolutely clear).
261     The action now is always to scan all levels of directory, and just
262     apply the include/exclude patterns to regular files.
263 ph10 345
264 ph10 325 5. Added the --include_dir and --exclude_dir patterns to pcregrep, and used
265 ph10 345 --exclude_dir in the tests to avoid scanning .svn directories.
267 ph10 326 6. Applied Craig's patch to the QuoteMeta function so that it escapes the
268 ph10 345 NUL character as backslash + 0 rather than backslash + NUL, because PCRE
269 ph10 326 doesn't support NULs in patterns.
270 ph10 345
271     7. Added some missing "const"s to declarations of static tables in
272     pcre_compile.c and pcre_dfa_exec.c.
274 ph10 328 8. Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
275 ph10 329 caused by fix #2 above. (Subsequently also a second patch to fix the
276 ph10 345 first patch. And a third patch - this was a messy problem.)
277 ph10 321
278 ph10 345 9. Applied Craig's patch to remove the use of push_back().
280 ph10 332 10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
281     matching function regexec().
282 ph10 345
283     11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
284     which, however, unlike Perl's \g{...}, are subroutine calls, not back
285 ph10 333 references. PCRE supports relative numbers with this syntax (I don't think
286     Oniguruma does).
287 ph10 345
288     12. Previously, a group with a zero repeat such as (...){0} was completely
289 ph10 335 omitted from the compiled regex. However, this means that if the group
290     was called as a subroutine from elsewhere in the pattern, things went wrong
291 ph10 345 (an internal error was given). Such groups are now left in the compiled
292     pattern, with a new opcode that causes them to be skipped at execution
293 ph10 335 time.
294 ph10 345
295 ph10 341 13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
296     to the way PCRE behaves:
297 ph10 345
298 ph10 336 (a) A lone ] character is dis-allowed (Perl treats it as data).
299 ph10 345
300     (b) A back reference to an unmatched subpattern matches an empty string
301 ph10 336 (Perl fails the current match path).
302 ph10 345
303 ph10 341 (c) A data ] in a character class must be notated as \] because if the
304 ph10 345 first data character in a class is ], it defines an empty class. (In
305 ph10 341 Perl it is not possible to have an empty class.) The empty class []
306     never matches; it forces failure and is equivalent to (*FAIL) or (?!).
307     The negative empty class [^] matches any one character, independently
308     of the DOTALL setting.
309 ph10 345
310     14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
311 ph10 340 non-existent subpattern following a character class starting with ']' and
312     containing () gave an internal compiling error instead of "reference to
313     non-existent subpattern". Fortunately, when the pattern did exist, the
314 ph10 345 compiled code was correct. (When scanning forwards to check for the
315 ph10 340 existencd of the subpattern, it was treating the data ']' as terminating
316 ph10 345 the class, so got the count wrong. When actually compiling, the reference
317 ph10 340 was subsequently set up correctly.)
318 ph10 345
319 ph10 341 15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
320 ph10 345 it was being rejected as not supported by pcre_dfa_exec(), even though
321     other assertions are supported. I have made pcre_dfa_exec() support
322     (*FAIL).
324 ph10 342 16. The implementation of 13c above involved the invention of a new opcode,
325 ph10 345 OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
326     cannot be changed at match time, I realized I could make a small
327     improvement to matching performance by compiling OP_ALLANY instead of
328     OP_ANY for "." when DOTALL was set, and then removing the runtime tests
329     on the OP_ANY path.
331     17. Compiling pcretest on Windows with readline support failed without the
332 ph10 343 following two fixes: (1) Make the unistd.h include conditional on
333 ph10 345 HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
335 ph10 344 18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
336 ph10 345 ncurses library to be included for pcretest when ReadLine support is
337     requested, but also to allow for it to be overridden. This patch came from
338     Daniel Bergström.
339 ph10 347
340 ph10 346 19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
341 ph10 347 as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
342     any errors with the current Unicode tables. Thanks to Peter Kankowski for
343     spotting this.
344 ph10 324
345 ph10 332
346 ph10 319 Version 7.6 28-Jan-08
347 ph10 300 ---------------------
349 ph10 302 1. A character class containing a very large number of characters with
350     codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
351     overflow.
352 ph10 309
353     2. Patch to cut out the "long long" test in pcrecpp_unittest when
354     HAVE_LONG_LONG is not defined.
356 ph10 303 3. Applied Christian Ehrlicher's patch to update the CMake build files to
357 ph10 304 bring them up to date and include new features. This patch includes:
358 ph10 309
359 ph10 304 - Fixed PH's badly added libz and libbz2 support.
360     - Fixed a problem with static linking.
361 ph10 312 - Added pcredemo. [But later removed - see 7 below.]
362 ph10 304 - Fixed dftables problem and added an option.
363     - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
365     - Added readline support for pcretest.
366 ph10 309 - Added an listing of the option settings after cmake has run.
368 ph10 314 4. A user submitted a patch to Makefile that makes it easy to create
369     "pcre.dll" under mingw when using Configure/Make. I added stuff to
370     Makefile.am that cause it to include this special target, without
371     affecting anything else. Note that the same mingw target plus all
372     the other distribution libraries and programs are now supported
373     when configuring with CMake (see 6 below) instead of with
374     Configure/Make.
375 ph10 309
376 ph10 308 5. Applied Craig's patch that moves no_arg into the RE class in the C++ code.
377     This is an attempt to solve the reported problem "pcrecpp::no_arg is not
378 ph10 309 exported in the Windows port". It has not yet been confirmed that the patch
379     solves the problem, but it does no harm.
380 ph10 313
381 ph10 311 6. Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
382 ph10 319 NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
383 ph10 314 with CMake, and also correct the comment about stack recursion.
384 ph10 313
385 ph10 312 7. Remove the automatic building of pcredemo from the ./configure system and
386 ph10 313 from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
387     of a program that users should build themselves after PCRE is installed, so
388     building it automatically is not really right. What is more, it gave
389 ph10 312 trouble in some build environments.
390 ph10 300
391 ph10 319 8. Further tidies to CMakeLists.txt from Sheri and Christian.
392 ph10 308
393 ph10 319
394 ph10 298 Version 7.5 10-Jan-08
395 ph10 263 ---------------------
397     1. Applied a patch from Craig: "This patch makes it possible to 'ignore'
398     values in parens when parsing an RE using the C++ wrapper."
399 ph10 286
400 ph10 264 2. Negative specials like \S did not work in character classes in UTF-8 mode.
401     Characters greater than 255 were excluded from the class instead of being
402     included.
403 ph10 286
404     3. The same bug as (2) above applied to negated POSIX classes such as
405 ph10 265 [:^space:].
406 ph10 286
407 ph10 267 4. PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
408     defined or documented. It seems to have been a typo for PCRE_STATIC, so
409 ph10 286 I have changed it.
411 ph10 268 5. The construct (?&) was not diagnosed as a syntax error (it referenced the
412 ph10 286 first named subpattern) and a construct such as (?&a) would reference the
413     first named subpattern whose name started with "a" (in other words, the
414 ph10 272 length check was missing). Both these problems are fixed. "Subpattern name
415     expected" is now given for (?&) (a zero-length name), and this patch also
416     makes it give the same error for \k'' (previously it complained that that
417     was a reference to a non-existent subpattern).
418 ph10 286
419 ph10 269 6. The erroneous patterns (?+-a) and (?-+a) give different error messages;
420 ph10 286 this is right because (?- can be followed by option settings as well as by
421 ph10 269 digits. I have, however, made the messages clearer.
422 ph10 286
423 ph10 270 7. Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
424     than the number used in the conditional) now cause a compile-time error.
425     This is actually not compatible with Perl, which accepts such patterns, but
426     treats the conditional as always being FALSE (as PCRE used to), but it
427     seems to me that giving a diagnostic is better.
428 ph10 286
429 ph10 274 8. Change "alphameric" to the more common word "alphanumeric" in comments
430 ph10 275 and messages.
431 ph10 286
432     9. Fix two occurrences of "backslash" in comments that should have been
433     "backspace".
435     10. Remove two redundant lines of code that can never be obeyed (their function
436     was moved elsewhere).
438     11. The program that makes PCRE's Unicode character property table had a bug
439     which caused it to generate incorrect table entries for sequences of
440 ph10 277 characters that have the same character type, but are in different scripts.
441 ph10 286 It amalgamated them into a single range, with the script of the first of
442 ph10 277 them. In other words, some characters were in the wrong script. There were
443     thirteen such cases, affecting characters in the following ranges:
444 ph10 286
445 ph10 277 U+002b0 - U+002c1
446     U+0060c - U+0060d
447 ph10 286 U+0061e - U+00612
448 ph10 277 U+0064b - U+0065e
449     U+0074d - U+0076d
450     U+01800 - U+01805
451     U+01d00 - U+01d77
452     U+01d9b - U+01dbf
453     U+0200b - U+0200f
454     U+030fc - U+030fe
455     U+03260 - U+0327f
456     U+0fb46 - U+0fbb1
457     U+10450 - U+1049d
458 ph10 286
459 ph10 279 12. The -o option (show only the matching part of a line) for pcregrep was not
460     compatible with GNU grep in that, if there was more than one match in a
461     line, it showed only the first of them. It now behaves in the same way as
462     GNU grep.
463 ph10 286
464     13. If the -o and -v options were combined for pcregrep, it printed a blank
465     line for every non-matching line. GNU grep prints nothing, and pcregrep now
466     does the same. The return code can be used to tell if there were any
467     non-matching lines.
469 ph10 289 14. Added --file-offsets and --line-offsets to pcregrep.
471     15. The pattern (?=something)(?R) was not being diagnosed as a potentially
472 ph10 282 infinitely looping recursion. The bug was that positive lookaheads were not
473 ph10 286 being skipped when checking for a possible empty match (negative lookaheads
474     and both kinds of lookbehind were skipped).
476 ph10 289 16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
477 ph10 284 inclusion of <windows.h> to before rather than after the definition of
478     INVALID_FILE_ATTRIBUTES (patch from David Byron).
479 ph10 263
480 ph10 289 17. Specifying a possessive quantifier with a specific limit for a Unicode
481 ph10 286 character property caused pcre_compile() to compile bad code, which led at
482     runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
483     are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
484     caused the error; without that there was no problem.
485 ph10 263
486 ph10 289 18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
487 ph10 286
488 ph10 289 19. Added --enable-pcretest-libreadline.
489 ph10 286
490 ph10 289 20. In pcrecpp.cc, the variable 'count' was incremented twice in
491 ph10 288 RE::GlobalReplace(). As a result, the number of replacements returned was
492 ph10 298 double what it should be. I removed one of the increments, but Craig sent a
493     later patch that removed the other one (the right fix) and added unit tests
494     that check the return values (which was not done before).
495 ph10 292
496 ph10 291 21. Several CMake things:
497 ph10 287
498 ph10 291 (1) Arranged that, when cmake is used on Unix, the libraries end up with
499 ph10 292 the names libpcre and libpcreposix, not just pcre and pcreposix.
500 ph10 288
501 ph10 292 (2) The above change means that pcretest and pcregrep are now correctly
502     linked with the newly-built libraries, not previously installed ones.
503 ph10 291
505 ph10 298
506     22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
507     crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
508     UTF-8 newline character). The key issue is that the pattern starts .*;
509     this means that the match must be either at the beginning, or after a
510     newline. The bug was in the code for advancing after a failed match and
511     checking that the new position followed a newline. It was not taking
512 ph10 294 account of UTF-8 characters correctly.
513 ph10 298
514     23. PCRE was behaving differently from Perl in the way it recognized POSIX
515     character classes. PCRE was not treating the sequence [:...:] as a
516     character class unless the ... were all letters. Perl, however, seems to
517     allow any characters between [: and :], though of course it rejects as
518     unknown any "names" that contain non-letters, because all the known class
519     names consist only of letters. Thus, Perl gives an error for [[:1234:]],
520     for example, whereas PCRE did not - it did not recognize a POSIX character
521     class. This seemed a bit dangerous, so the code has been changed to be
522     closer to Perl. The behaviour is not identical to Perl, because PCRE will
523     diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
524     treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
525     Perl does, and where it didn't before.
527 ph10 296 24. Rewrite so as to remove the single use of %n from pcregrep because in some
528     Windows environments %n is disabled by default.
529 ph10 292
531 ph10 260 Version 7.4 21-Sep-07
532 ph10 230 ---------------------
534     1. Change 7.3/28 was implemented for classes by looking at the bitmap. This
535 ph10 231 means that a class such as [\s] counted as "explicit reference to CR or
536     LF". That isn't really right - the whole point of the change was to try to
537     help when there was an actual mention of one of the two characters. So now
538     the change happens only if \r or \n (or a literal CR or LF) character is
539 ph10 230 encountered.
540 ph10 231
541     2. The 32-bit options word was also used for 6 internal flags, but the numbers
542     of both had grown to the point where there were only 3 bits left.
543     Fortunately, there was spare space in the data structure, and so I have
544     moved the internal flags into a new 16-bit field to free up more option
545 ph10 230 bits.
546 ph10 231
547     3. The appearance of (?J) at the start of a pattern set the DUPNAMES option,
548     but did not set the internal JCHANGED flag - either of these is enough to
549     control the way the "get" function works - but the PCRE_INFO_JCHANGED
550     facility is supposed to tell if (?J) was ever used, so now (?J) at the
551 ph10 230 start sets both bits.
553 ph10 231 4. Added options (at build time, compile time, exec time) to change \R from
554     matching any Unicode line ending sequence to just matching CR, LF, or CRLF.
555 ph10 230
556 ph10 243 5. doc/pcresyntax.html was missing from the distribution.
558     6. Put back the definition of PCRE_ERROR_NULLWSLIMIT, for backward
559 ph10 233 compatibility, even though it is no longer used.
560 ph10 243
561     7. Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and
562 ph10 254 strtoull to pcrecpp.cc to select the available functions in WIN32 when the
563 ph10 259 windows.h file is present (where different names are used). [This was
564 ph10 257 reversed later after testing - see 16 below.]
565 ph10 243
566     8. Changed all #include <config.h> to #include "config.h". There were also
567 ph10 236 some further <pcre.h> cases that I changed to "pcre.h".
568 ph10 243
569 ph10 239 9. When pcregrep was used with the --colour option, it missed the line ending
570 ph10 243 sequence off the lines that it output.
572     10. It was pointed out to me that arrays of string pointers cause lots of
573     relocations when a shared library is dynamically loaded. A technique of
574     using a single long string with a table of offsets can drastically reduce
575     these. I have refactored PCRE in four places to do this. The result is
576 ph10 240 dramatic:
577 ph10 243
578 ph10 240 Originally: 290
579     After changing UCP table: 187
580 ph10 243 After changing error message table: 43
581 ph10 240 After changing table of "verbs" 36
582     After changing table of Posix names 22
583 ph10 243
584 ph10 240 Thanks to the folks working on Gregex for glib for this insight.
585 ph10 247
586 ph10 244 11. --disable-stack-for-recursion caused compiling to fail unless -enable-
587 ph10 247 unicode-properties was also set.
589 ph10 248 12. Updated the tests so that they work when \R is defaulted to ANYCRLF.
590 ph10 231
591 ph10 253 13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously
592     checked only for CRLF.
593 ph10 233
594 ph10 259 14. Added casts to pcretest.c to avoid compiler warnings.
596 ph10 256 15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
597 ph10 253
598 ph10 257 16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
599 ph10 259 and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
600     entirely. This removes changes made in 7 above.
601 ph10 256
602 ph10 261 17. The CMake files have been updated, and there is now more information about
603     building with CMake in the NON-UNIX-USE document.
604 ph10 257
605 ph10 261
606 ph10 228 Version 7.3 28-Aug-07
607 ph10 157 ---------------------
609 ph10 189 1. In the rejigging of the build system that eventually resulted in 7.1, the
610     line "#include <pcre.h>" was included in pcre_internal.h. The use of angle
611     brackets there is not right, since it causes compilers to look for an
612     installed pcre.h, not the version that is in the source that is being
613     compiled (which of course may be different). I have changed it back to:
614 ph10 197
615 ph10 189 #include "pcre.h"
616 ph10 197
617     I have a vague recollection that the change was concerned with compiling in
618     different directories, but in the new build system, that is taken care of
619     by the VPATH setting the Makefile.
621 ph10 190 2. The pattern .*$ when run in not-DOTALL UTF-8 mode with newline=any failed
622     when the subject happened to end in the byte 0x85 (e.g. if the last
623     character was \x{1ec5}). *Character* 0x85 is one of the "any" newline
624     characters but of course it shouldn't be taken as a newline when it is part
625     of another character. The bug was that, for an unlimited repeat of . in
626     not-DOTALL UTF-8 mode, PCRE was advancing by bytes rather than by
627     characters when looking for a newline.
628 ph10 197
629     3. A small performance improvement in the DOTALL UTF-8 mode .* case.
631     4. Debugging: adjusted the names of opcodes for different kinds of parentheses
632     in debug output.
634 ph10 201 5. Arrange to use "%I64d" instead of "%lld" and "%I64u" instead of "%llu" for
635     long printing in the pcrecpp unittest when running under MinGW.
636 ph10 189
637 ph10 197 6. ESC_K was left out of the EBCDIC table.
638 ph10 189
639 ph10 197 7. Change 7.0/38 introduced a new limit on the number of nested non-capturing
640     parentheses; I made it 1000, which seemed large enough. Unfortunately, the
641     limit also applies to "virtual nesting" when a pattern is recursive, and in
642     this case 1000 isn't so big. I have been able to remove this limit at the
643     expense of backing off one optimization in certain circumstances. Normally,
644     when pcre_exec() would call its internal match() function recursively and
645     immediately return the result unconditionally, it uses a "tail recursion"
646     feature to save stack. However, when a subpattern that can match an empty
647     string has an unlimited repetition quantifier, it no longer makes this
648     optimization. That gives it a stack frame in which to save the data for
649     checking that an empty string has been matched. Previously this was taken
650     from the 1000-entry workspace that had been reserved. So now there is no
651     explicit limit, but more stack is used.
652 ph10 189
653 ph10 200 8. Applied Daniel's patches to solve problems with the import/export magic
654     syntax that is required for Windows, and which was going wrong for the
655     pcreposix and pcrecpp parts of the library. These were overlooked when this
656     problem was solved for the main library.
657 ph10 197
658 ph10 202 9. There were some crude static tests to avoid integer overflow when computing
659     the size of patterns that contain repeated groups with explicit upper
660     limits. As the maximum quantifier is 65535, the maximum group length was
661     set at 30,000 so that the product of these two numbers did not overflow a
662     32-bit integer. However, it turns out that people want to use groups that
663     are longer than 30,000 bytes (though not repeat them that many times).
664     Change 7.0/17 (the refactoring of the way the pattern size is computed) has
665     made it possible to implement the integer overflow checks in a much more
666     dynamic way, which I have now done. The artificial limitation on group
667     length has been removed - we now have only the limit on the total length of
668     the compiled pattern, which depends on the LINK_SIZE setting.
669 ph10 208
670     10. Fixed a bug in the documentation for get/copy named substring when
671     duplicate names are permitted. If none of the named substrings are set, the
672     functions return PCRE_ERROR_NOSUBSTRING (7); the doc said they returned an
673     empty string.
675     11. Because Perl interprets \Q...\E at a high level, and ignores orphan \E
676     instances, patterns such as [\Q\E] or [\E] or even [^\E] cause an error,
677     because the ] is interpreted as the first data character and the
678     terminating ] is not found. PCRE has been made compatible with Perl in this
679     regard. Previously, it interpreted [\Q\E] as an empty class, and [\E] could
680     cause memory overwriting.
682 ph10 206 10. Like Perl, PCRE automatically breaks an unlimited repeat after an empty
683     string has been matched (to stop an infinite loop). It was not recognizing
684 ph10 208 a conditional subpattern that could match an empty string if that
685 ph10 206 subpattern was within another subpattern. For example, it looped when
686 ph10 208 trying to match (((?(1)X|))*) but it was OK with ((?(1)X|)*) where the
687 ph10 206 condition was not nested. This bug has been fixed.
688 ph10 208
689 ph10 207 12. A pattern like \X?\d or \P{L}?\d in non-UTF-8 mode could cause a backtrack
690     past the start of the subject in the presence of bytes with the top bit
691     set, for example "\x8aBCD".
692 ph10 211
693 ph10 210 13. Added Perl 5.10 experimental backtracking controls (*FAIL), (*F), (*PRUNE),
694     (*SKIP), (*THEN), (*COMMIT), and (*ACCEPT).
695 ph10 200
696 ph10 211 14. Optimized (?!) to (*FAIL).
697 ph10 202
698 ph10 212 15. Updated the test for a valid UTF-8 string to conform to the later RFC 3629.
699     This restricts code points to be within the range 0 to 0x10FFFF, excluding
700     the "low surrogate" sequence 0xD800 to 0xDFFF. Previously, PCRE allowed the
701     full range 0 to 0x7FFFFFFF, as defined by RFC 2279. Internally, it still
702     does: it's just the validity check that is more restrictive.
703 ph10 220
704     16. Inserted checks for integer overflows during escape sequence (backslash)
705     processing, and also fixed erroneous offset values for syntax errors during
706     backslash processing.
708 ph10 214 17. Fixed another case of looking too far back in non-UTF-8 mode (cf 12 above)
709 ph10 220 for patterns like [\PPP\x8a]{1,}\x80 with the subject "A\x80".
711 ph10 215 18. An unterminated class in a pattern like (?1)\c[ with a "forward reference"
712     caused an overrun.
713 ph10 220
714     19. A pattern like (?:[\PPa*]*){8,} which had an "extended class" (one with
715     something other than just ASCII characters) inside a group that had an
716     unlimited repeat caused a loop at compile time (while checking to see
717     whether the group could match an empty string).
719 ph10 217 20. Debugging a pattern containing \p or \P could cause a crash. For example,
720     [\P{Any}] did so. (Error in the code for printing property names.)
721 ph10 210
722 ph10 220 21. An orphan \E inside a character class could cause a crash.
724     22. A repeated capturing bracket such as (A)? could cause a wild memory
725 ph10 218 reference during compilation.
726 ph10 220
727     23. There are several functions in pcre_compile() that scan along a compiled
728     expression for various reasons (e.g. to see if it's fixed length for look
729 ph10 218 behind). There were bugs in these functions when a repeated \p or \P was
730 ph10 220 present in the pattern. These operators have additional parameters compared
731     with \d, etc, and these were not being taken into account when moving along
732 ph10 218 the compiled data. Specifically:
733 ph10 220
734     (a) A item such as \p{Yi}{3} in a lookbehind was not treated as fixed
735     length.
737     (b) An item such as \pL+ within a repeated group could cause crashes or
738 ph10 218 loops.
739 ph10 220
740 ph10 218 (c) A pattern such as \p{Yi}+(\P{Yi}+)(?1) could give an incorrect
741 ph10 220 "reference to non-existent subpattern" error.
743 ph10 221 (d) A pattern like (\P{Yi}{2}\277)? could loop at compile time.
745 ph10 219 24. A repeated \S or \W in UTF-8 mode could give wrong answers when multibyte
746 ph10 220 characters were involved (for example /\S{2}/8g with "A\x{a3}BC").
747 ph10 211
748 ph10 222 25. Using pcregrep in multiline, inverted mode (-Mv) caused it to loop.
749 ph10 218
750 ph10 227 26. Patterns such as [\P{Yi}A] which include \p or \P and just one other
751 ph10 223 character were causing crashes (broken optimization).
752 ph10 227
753 ph10 224 27. Patterns such as (\P{Yi}*\277)* (group with possible zero repeat containing
754 ph10 227 \p or \P) caused a compile-time loop.
756 ph10 226 28. More problems have arisen in unanchored patterns when CRLF is a valid line
757     break. For example, the unstudied pattern [\r\n]A does not match the string
758     "\r\nA" because change 7.0/46 below moves the current point on by two
759     characters after failing to match at the start. However, the pattern \nA
760 ph10 227 *does* match, because it doesn't start till \n, and if [\r\n]A is studied,
761     the same is true. There doesn't seem any very clean way out of this, but
762     what I have chosen to do makes the common cases work: PCRE now takes note
763     of whether there can be an explicit match for \r or \n anywhere in the
764     pattern, and if so, 7.0/46 no longer applies. As part of this change,
765     there's a new PCRE_INFO_HASCRORLF option for finding out whether a compiled
766     pattern has explicit CR or LF references.
767 ph10 222
768 ph10 227 29. Added (*CR) etc for changing newline setting at start of pattern.
769 ph10 223
770 ph10 227
771 ph10 189 Version 7.2 19-Jun-07
772     ---------------------
774 ph10 157 1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
775     which is apparently normally available under Windows.
776 ph10 159
777     2. Re-jig the pcregrep tests with different newline settings in an attempt
778     to make them independent of the local environment's newline setting.
779 ph10 157
780 ph10 160 3. Add code to configure.ac to remove -g from the CFLAGS default settings.
781 ph10 165
782 ph10 161 4. Some of the "internals" tests were previously cut out when the link size
783     was not 2, because the output contained actual offsets. The recent new
784 ph10 165 "Z" feature of pcretest means that these can be cut out, making the tests
785     usable with all link sizes.
787 ph10 164 5. Implemented Stan Switzer's goto replacement for longjmp() when not using
788     stack recursion. This gives a massive performance boost under BSD, but just
789 ph10 165 a small improvement under Linux. However, it saves one field in the frame
790 ph10 164 in all cases.
791 ph10 172
792 ph10 166 6. Added more features from the forthcoming Perl 5.10:
793 ph10 172
794 ph10 166 (a) (?-n) (where n is a string of digits) is a relative subroutine or
795     recursion call. It refers to the nth most recently opened parentheses.
796 ph10 172
797 ph10 166 (b) (?+n) is also a relative subroutine call; it refers to the nth next
798 ph10 172 to be opened parentheses.
800     (c) Conditions that refer to capturing parentheses can be specified
801 ph10 167 relatively, for example, (?(-2)... or (?(+3)...
802 ph10 172
803 ph10 168 (d) \K resets the start of the current match so that everything before
804 ph10 172 is not part of it.
806 ph10 171 (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
807 ph10 172
808 ph10 171 (f) \g{name} is another synonym - part of Perl 5.10's unification of
809 ph10 172 reference syntax.
810 ph10 182
811 ph10 175 (g) (?| introduces a group in which the numbering of parentheses in each
812 ph10 182 alternative starts with the same number.
813 ph10 172
814 ph10 182 (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
816 ph10 172 7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
819     8. A pattern such as (.*(.)?)* caused pcre_exec() to fail by either not
820     terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
821 ph10 170 for detecting groups that can match an empty string.
822 ph10 159
823 ph10 172 9. A pattern with a very large number of alternatives (more than several
824     hundred) was running out of internal workspace during the pre-compile
825     phase, where pcre_compile() figures out how much memory will be needed. A
826     bit of new cunning has reduced the workspace needed for groups with
827     alternatives. The 1000-alternative test pattern now uses 12 bytes of
828     workspace instead of running out of the 4096 that are available.
829 ph10 182
830 ph10 176 10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
831 ph10 172
832 ph10 179 11. Applied patch from Google to remove an optimization that didn't quite work.
833     The report of the bug said:
834 ph10 182
835 ph10 179 pcrecpp::RE("a*").FullMatch("aaa") matches, while
836     pcrecpp::RE("a*?").FullMatch("aaa") does not, and
837 ph10 182 pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
838 ph10 185
839 ph10 184 12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
840 ph10 185 it matched the wrong number of bytes.
841 ph10 172
842 ph10 179
843 ph10 155 Version 7.1 24-Apr-07
844 ph10 98 ---------------------
846 ph10 111 1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
847 ph10 122 that is more "standard", making use of automake and other Autotools. There
848 ph10 99 is some re-arrangement of the files and adjustment of comments consequent
849     on this.
850 ph10 111
851     2. Part of the patch fixed a problem with the pcregrep tests. The test of -r
852     for recursive directory scanning broke on some systems because the files
853     are not scanned in any specific order and on different systems the order
854     was different. A call to "sort" has been inserted into RunGrepTest for the
855     approprate test as a short-term fix. In the longer term there may be an
856 ph10 100 alternative.
857 ph10 111
858 ph10 100 3. I had an email from Eric Raymond about problems translating some of PCRE's
859 ph10 111 man pages to HTML (despite the fact that I distribute HTML pages, some
860     people do their own conversions for various reasons). The problems
861     concerned the use of low-level troff macros .br and .in. I have therefore
862     removed all such uses from the man pages (some were redundant, some could
863 ph10 113 be replaced by .nf/.fi pairs). The 132html script that I use to generate
864     HTML has been updated to handle .nf/.fi and to complain if it encounters
865     .br or .in.
866 ph10 111
867 ph10 100 4. Updated comments in configure.ac that get placed in config.h.in and also
868 ph10 123 arranged for config.h to be included in the distribution, with the name
869 ph10 111 config.h.generic, for the benefit of those who have to compile without
870     Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
872     5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan
873     Weber: (1) pcre_internal.h was missing some function renames; (2) updated
874 ph10 127 makevp.bat for the current PCRE, using the additional files
875 ph10 135 makevp_c.txt, makevp_l.txt, and pcregexp.pas.
876 ph10 111
877     6. A Windows user reported a minor discrepancy with test 2, which turned out
878     to be caused by a trailing space on an input line that had got lost in his
879 ph10 102 copy. The trailing space was an accident, so I've just removed it.
880 ph10 111
881 ph10 104 7. Add -Wl,-R... flags in pcre-config.in for *BSD* systems, as I'm told
882 ph10 111 that is needed.
884 ph10 105 8. Mark ucp_table (in ucptable.h) and ucp_gentype (in pcre_ucp_searchfuncs.c)
885     as "const" (a) because they are and (b) because it helps the PHP
886     maintainers who have recently made a script to detect big data structures
887 ph10 111 in the php code that should be moved to the .rodata section. I remembered
888     to update Builducptable as well, so it won't revert if ucptable.h is ever
889 ph10 105 re-created.
890 ph10 111
891     9. Added some extra #ifdef SUPPORT_UTF8 conditionals into pcretest.c,
892 ph10 107 pcre_printint.src, pcre_compile.c, pcre_study.c, and pcre_tables.c, in
893 ph10 111 order to be able to cut out the UTF-8 tables in the latter when UTF-8
894     support is not required. This saves 1.5-2K of code, which is important in
895 ph10 107 some applications.
896 ph10 111
897 ph10 110 Later: more #ifdefs are needed in pcre_ord2utf8.c and pcre_valid_utf8.c
898 ph10 111 so as not to refer to the tables, even though these functions will never be
899     called when UTF-8 support is disabled. Otherwise there are problems with a
900     shared library.
902 ph10 118 10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:
904     (a) It was defining its arguments as char * instead of void *.
906 ph10 123 (b) It was assuming that all moves were upwards in memory; this was true
907     a long time ago when I wrote it, but is no longer the case.
909 ph10 118 The emulated memove() is provided for those environments that have neither
910 ph10 123 memmove() nor bcopy(). I didn't think anyone used it these days, but that
911 ph10 118 is clearly not the case, as these two bugs were recently reported.
912 ph10 123
913 ph10 111 11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
914 ph10 123 and Detrail to create the HTML documentation, the .txt form of the man
915     pages, and it removes trailing spaces from listed files. It also creates
916     pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter
917     case, it wraps all the #defines with #ifndefs. This script should be run
918 ph10 111 before "make dist".
919 ph10 123
920 ph10 115 12. Fixed two fairly obscure bugs concerned with quantified caseless matching
921     with Unicode property support.
922 ph10 123
923     (a) For a maximizing quantifier, if the two different cases of the
924     character were of different lengths in their UTF-8 codings (there are
925     some cases like this - I found 11), and the matching function had to
926 ph10 115 back up over a mixture of the two cases, it incorrectly assumed they
927     were both the same length.
928 ph10 123
929     (b) When PCRE was configured to use the heap rather than the stack for
930     recursion during matching, it was not correctly preserving the data for
931     the other case of a UTF-8 character when checking ahead for a match
932     while processing a minimizing repeat. If the check also involved
933 ph10 115 matching a wide character, but failed, corruption could cause an
934     erroneous result when trying to check for a repeat of the original
935     character.
936 ph10 123
937 ph10 116 13. Some tidying changes to the testing mechanism:
938 ph10 98
939 ph10 116 (a) The RunTest script now detects the internal link size and whether there
940     is UTF-8 and UCP support by running ./pcretest -C instead of relying on
941 ph10 123 values substituted by "configure". (The RunGrepTest script already did
942     this for UTF-8.) The configure.ac script no longer substitutes the
943     relevant variables.
945 ph10 116 (b) The debugging options /B and /D in pcretest show the compiled bytecode
946     with length and offset values. This means that the output is different
947     for different internal link sizes. Test 2 is skipped for link sizes
948     other than 2 because of this, bypassing the problem. Unfortunately,
949     there was also a test in test 3 (the locale tests) that used /B and
950 ph10 123 failed for link sizes other than 2. Rather than cut the whole test out,
951     I have added a new /Z option to pcretest that replaces the length and
952     offset values with spaces. This is now used to make test 3 independent
953 ph10 122 of link size. (Test 2 will be tidied up later.)
954 ph10 123
955     14. If erroroffset was passed as NULL to pcre_compile, it provoked a
956 ph10 122 segmentation fault instead of returning the appropriate error message.
957 ph10 134
958 ph10 131 15. In multiline mode when the newline sequence was set to "any", the pattern
959 ph10 134 ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
960     This doesn't seem right; it now treats the CRLF combination as the line
961     ending, and so does not match in that case. It's only a pattern such as ^$
962     that would hit this one: something like ^ABC$ would have failed after \r
963     and then tried again after \r\n.
965 ph10 131 16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
966 ph10 134 in an attempt to make files that differ only in their line terminators
967     compare equal. This works on Linux.
968 ph10 142
969 ph10 141 17. Under certain error circumstances pcregrep might try to free random memory
970     as it exited. This is now fixed, thanks to valgrind.
971 ph10 142
972 ph10 141 19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
973 ph10 142 "abc\r\n\r\n", it found an unwanted second match after the second \r. This
974     was because its rules for how to advance for /g after matching an empty
975 ph10 143 string at the end of a line did not allow for this case. They now check for
976     it specially.
977 ph10 150
978     20. pcretest is supposed to handle patterns and data of any length, by
979     extending its buffers when necessary. It was getting this wrong when the
980 ph10 147 buffer for a data line had to be extended.
981 ph10 150
982 ph10 149 21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
983 ph10 150 CRLF as a newline sequence.
984 ph10 152
985 ph10 151 22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
986 ph10 152 out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
987     I have nevertheless tidied it up.
988 ph10 111
989 ph10 152 23. Added some casts to kill warnings from HP-UX ia64 compiler.
990 ph10 123
991 ph10 153 24. Added a man page for pcre-config.
992 ph10 152
993 ph10 153
994 nigel 93 Version 7.0 19-Dec-06
995     ---------------------
997     1. Fixed a signed/unsigned compiler warning in pcre_compile.c, shown up by
998     moving to gcc 4.1.1.
1000     2. The -S option for pcretest uses setrlimit(); I had omitted to #include
1001     sys/time.h, which is documented as needed for this function. It doesn't
1002     seem to matter on Linux, but it showed up on some releases of OS X.
1004     3. It seems that there are systems where bytes whose values are greater than
1005     127 match isprint() in the "C" locale. The "C" locale should be the
1006     default when a C program starts up. In most systems, only ASCII printing
1007     characters match isprint(). This difference caused the output from pcretest
1008     to vary, making some of the tests fail. I have changed pcretest so that:
1010     (a) When it is outputting text in the compiled version of a pattern, bytes
1011     other than 32-126 are always shown as hex escapes.
1013     (b) When it is outputting text that is a matched part of a subject string,
1014     it does the same, unless a different locale has been set for the match
1015     (using the /L modifier). In this case, it uses isprint() to decide.
1017     4. Fixed a major bug that caused incorrect computation of the amount of memory
1018     required for a compiled pattern when options that changed within the
1019     pattern affected the logic of the preliminary scan that determines the
1020     length. The relevant options are -x, and -i in UTF-8 mode. The result was
1021     that the computed length was too small. The symptoms of this bug were
1022     either the PCRE error "internal error: code overflow" from pcre_compile(),
1023     or a glibc crash with a message such as "pcretest: free(): invalid next
1024     size (fast)". Examples of patterns that provoked this bug (shown in
1025     pcretest format) are:
1027     /(?-x: )/x
1028     /(?x)(?-x: \s*#\s*)/
1029     /((?i)[\x{c0}])/8
1030     /(?i:[\x{c0}])/8
1032     HOWEVER: Change 17 below makes this fix obsolete as the memory computation
1033     is now done differently.
1035     5. Applied patches from Google to: (a) add a QuoteMeta function to the C++
1036     wrapper classes; (b) implement a new function in the C++ scanner that is
1037     more efficient than the old way of doing things because it avoids levels of
1038     recursion in the regex matching; (c) add a paragraph to the documentation
1039     for the FullMatch() function.
1041     6. The escape sequence \n was being treated as whatever was defined as
1042     "newline". Not only was this contrary to the documentation, which states
1043     that \n is character 10 (hex 0A), but it also went horribly wrong when
1044     "newline" was defined as CRLF. This has been fixed.
1046     7. In pcre_dfa_exec.c the value of an unsigned integer (the variable called c)
1047     was being set to -1 for the "end of line" case (supposedly a value that no
1048     character can have). Though this value is never used (the check for end of
1049     line is "zero bytes in current character"), it caused compiler complaints.
1050     I've changed it to 0xffffffff.
1052     8. In pcre_version.c, the version string was being built by a sequence of
1053     C macros that, in the event of PCRE_PRERELEASE being defined as an empty
1054     string (as it is for production releases) called a macro with an empty
1055     argument. The C standard says the result of this is undefined. The gcc
1056     compiler treats it as an empty string (which was what was wanted) but it is
1057     reported that Visual C gives an error. The source has been hacked around to
1058     avoid this problem.
1060     9. On the advice of a Windows user, included <io.h> and <fcntl.h> in Windows
1061     builds of pcretest, and changed the call to _setmode() to use _O_BINARY
1062     instead of 0x8000. Made all the #ifdefs test both _WIN32 and WIN32 (not all
1063     of them did).
1065     10. Originally, pcretest opened its input and output without "b"; then I was
1066     told that "b" was needed in some environments, so it was added for release
1067     5.0 to both the input and output. (It makes no difference on Unix-like
1068     systems.) Later I was told that it is wrong for the input on Windows. I've
1069     now abstracted the modes into two macros, to make it easier to fiddle with
1070     them, and removed "b" from the input mode under Windows.
1072     11. Added pkgconfig support for the C++ wrapper library, libpcrecpp.
1074     12. Added -help and --help to pcretest as an official way of being reminded
1075     of the options.
1077     13. Removed some redundant semicolons after macro calls in pcrecpparg.h.in
1078     and pcrecpp.cc because they annoy compilers at high warning levels.
1080     14. A bit of tidying/refactoring in pcre_exec.c in the main bumpalong loop.
1082     15. Fixed an occurrence of == in configure.ac that should have been = (shell
1083     scripts are not C programs :-) and which was not noticed because it works
1084     on Linux.
1086     16. pcretest is supposed to handle any length of pattern and data line (as one
1087     line or as a continued sequence of lines) by extending its input buffer if
1088     necessary. This feature was broken for very long pattern lines, leading to
1089     a string of junk being passed to pcre_compile() if the pattern was longer
1090     than about 50K.
1092     17. I have done a major re-factoring of the way pcre_compile() computes the
1093     amount of memory needed for a compiled pattern. Previously, there was code
1094     that made a preliminary scan of the pattern in order to do this. That was
1095     OK when PCRE was new, but as the facilities have expanded, it has become
1096     harder and harder to keep it in step with the real compile phase, and there
1097     have been a number of bugs (see for example, 4 above). I have now found a
1098     cunning way of running the real compile function in a "fake" mode that
1099     enables it to compute how much memory it would need, while actually only
1100     ever using a few hundred bytes of working memory and without too many
1101     tests of the mode. This should make future maintenance and development
1102     easier. A side effect of this work is that the limit of 200 on the nesting
1103     depth of parentheses has been removed (though this was never a serious
1104     limitation, I suspect). However, there is a downside: pcre_compile() now
1105     runs more slowly than before (30% or more, depending on the pattern). I
1106     hope this isn't a big issue. There is no effect on runtime performance.
1108     18. Fixed a minor bug in pcretest: if a pattern line was not terminated by a
1109     newline (only possible for the last line of a file) and it was a
1110     pattern that set a locale (followed by /Lsomething), pcretest crashed.
1112     19. Added additional timing features to pcretest. (1) The -tm option now times
1113     matching only, not compiling. (2) Both -t and -tm can be followed, as a
1114     separate command line item, by a number that specifies the number of
1115     repeats to use when timing. The default is 50000; this gives better
1116     precision, but takes uncomfortably long for very large patterns.
1118     20. Extended pcre_study() to be more clever in cases where a branch of a
1119     subpattern has no definite first character. For example, (a*|b*)[cd] would
1120     previously give no result from pcre_study(). Now it recognizes that the
1121     first character must be a, b, c, or d.
1123     21. There was an incorrect error "recursive call could loop indefinitely" if
1124     a subpattern (or the entire pattern) that was being tested for matching an
1125     empty string contained only one non-empty item after a nested subpattern.
1126     For example, the pattern (?>\x{100}*)\d(?R) provoked this error
1127     incorrectly, because the \d was being skipped in the check.
1129     22. The pcretest program now has a new pattern option /B and a command line
1130     option -b, which is equivalent to adding /B to every pattern. This causes
1131     it to show the compiled bytecode, without the additional information that
1132     -d shows. The effect of -d is now the same as -b with -i (and similarly, /D
1133     is the same as /B/I).
1135     23. A new optimization is now able automatically to treat some sequences such
1136     as a*b as a*+b. More specifically, if something simple (such as a character
1137     or a simple class like \d) has an unlimited quantifier, and is followed by
1138     something that cannot possibly match the quantified thing, the quantifier
1139     is automatically "possessified".
1141     24. A recursive reference to a subpattern whose number was greater than 39
1142     went wrong under certain circumstances in UTF-8 mode. This bug could also
1143     have affected the operation of pcre_study().
1145     25. Realized that a little bit of performance could be had by replacing
1146     (c & 0xc0) == 0xc0 with c >= 0xc0 when processing UTF-8 characters.
1148     26. Timing data from pcretest is now shown to 4 decimal places instead of 3.
1150     27. Possessive quantifiers such as a++ were previously implemented by turning
1151     them into atomic groups such as ($>a+). Now they have their own opcodes,
1152     which improves performance. This includes the automatically created ones
1153     from 23 above.
1155     28. A pattern such as (?=(\w+))\1: which simulates an atomic group using a
1156     lookahead was broken if it was not anchored. PCRE was mistakenly expecting
1157     the first matched character to be a colon. This applied both to named and
1158     numbered groups.
1160     29. The ucpinternal.h header file was missing its idempotency #ifdef.
1162     30. I was sent a "project" file called libpcre.a.dev which I understand makes
1163     building PCRE on Windows easier, so I have included it in the distribution.
1165     31. There is now a check in pcretest against a ridiculously large number being
1166     returned by pcre_exec() or pcre_dfa_exec(). If this happens in a /g or /G
1167     loop, the loop is abandoned.
1169     32. Forward references to subpatterns in conditions such as (?(2)...) where
1170     subpattern 2 is defined later cause pcre_compile() to search forwards in
1171     the pattern for the relevant set of parentheses. This search went wrong
1172     when there were unescaped parentheses in a character class, parentheses
1173     escaped with \Q...\E, or parentheses in a #-comment in /x mode.
1175     33. "Subroutine" calls and backreferences were previously restricted to
1176     referencing subpatterns earlier in the regex. This restriction has now
1177     been removed.
1179     34. Added a number of extra features that are going to be in Perl 5.10. On the
1180     whole, these are just syntactic alternatives for features that PCRE had
1181     previously implemented using the Python syntax or my own invention. The
1182     other formats are all retained for compatibility.
1184     (a) Named groups can now be defined as (?<name>...) or (?'name'...) as well
1185     as (?P<name>...). The new forms, as well as being in Perl 5.10, are
1186     also .NET compatible.
1188     (b) A recursion or subroutine call to a named group can now be defined as
1189     (?&name) as well as (?P>name).
1191     (c) A backreference to a named group can now be defined as \k<name> or
1192     \k'name' as well as (?P=name). The new forms, as well as being in Perl
1193     5.10, are also .NET compatible.
1195     (d) A conditional reference to a named group can now use the syntax
1196     (?(<name>) or (?('name') as well as (?(name).
1198     (e) A "conditional group" of the form (?(DEFINE)...) can be used to define
1199     groups (named and numbered) that are never evaluated inline, but can be
1200     called as "subroutines" from elsewhere. In effect, the DEFINE condition
1201     is always false. There may be only one alternative in such a group.
1203     (f) A test for recursion can be given as (?(R1).. or (?(R&name)... as well
1204     as the simple (?(R). The condition is true only if the most recent
1205     recursion is that of the given number or name. It does not search out
1206     through the entire recursion stack.
1208     (g) The escape \gN or \g{N} has been added, where N is a positive or
1209     negative number, specifying an absolute or relative reference.
1211     35. Tidied to get rid of some further signed/unsigned compiler warnings and
1212     some "unreachable code" warnings.
1214     36. Updated the Unicode property tables to Unicode version 5.0.0. Amongst other
1215     things, this adds five new scripts.
1217     37. Perl ignores orphaned \E escapes completely. PCRE now does the same.
1218     There were also incompatibilities regarding the handling of \Q..\E inside
1219     character classes, for example with patterns like [\Qa\E-\Qz\E] where the
1220     hyphen was adjacent to \Q or \E. I hope I've cleared all this up now.
1222     38. Like Perl, PCRE detects when an indefinitely repeated parenthesized group
1223     matches an empty string, and forcibly breaks the loop. There were bugs in
1224     this code in non-simple cases. For a pattern such as ^(a()*)* matched
1225     against aaaa the result was just "a" rather than "aaaa", for example. Two
1226     separate and independent bugs (that affected different cases) have been
1227     fixed.
1229     39. Refactored the code to abolish the use of different opcodes for small
1230     capturing bracket numbers. This is a tidy that I avoided doing when I
1231     removed the limit on the number of capturing brackets for 3.5 back in 2001.
1232     The new approach is not only tidier, it makes it possible to reduce the
1233     memory needed to fix the previous bug (38).
1235     40. Implemented PCRE_NEWLINE_ANY to recognize any of the Unicode newline
1236     sequences (http://unicode.org/unicode/reports/tr18/) as "newline" when
1237     processing dot, circumflex, or dollar metacharacters, or #-comments in /x
1238     mode.
1240     41. Add \R to match any Unicode newline sequence, as suggested in the Unicode
1241     report.
1243     42. Applied patch, originally from Ari Pollak, modified by Google, to allow
1244     copy construction and assignment in the C++ wrapper.
1246     43. Updated pcregrep to support "--newline=any". In the process, I fixed a
1247     couple of bugs that could have given wrong results in the "--newline=crlf"
1248     case.
1250     44. Added a number of casts and did some reorganization of signed/unsigned int
1251     variables following suggestions from Dair Grant. Also renamed the variable
1252     "this" as "item" because it is a C++ keyword.
1254     45. Arranged for dftables to add
1256     #include "pcre_internal.h"
1258     to pcre_chartables.c because without it, gcc 4.x may remove the array
1259     definition from the final binary if PCRE is built into a static library and
1260     dead code stripping is activated.
1262     46. For an unanchored pattern, if a match attempt fails at the start of a
1263     newline sequence, and the newline setting is CRLF or ANY, and the next two
1264     characters are CRLF, advance by two characters instead of one.
1267 nigel 91 Version 6.7 04-Jul-06
1268     ---------------------
1270     1. In order to handle tests when input lines are enormously long, pcretest has
1271     been re-factored so that it automatically extends its buffers when
1272     necessary. The code is crude, but this _is_ just a test program. The
1273     default size has been increased from 32K to 50K.
1275     2. The code in pcre_study() was using the value of the re argument before
1276     testing it for NULL. (Of course, in any sensible call of the function, it
1277     won't be NULL.)
1279     3. The memmove() emulation function in pcre_internal.h, which is used on
1280     systems that lack both memmove() and bcopy() - that is, hardly ever -
1281     was missing a "static" storage class specifier.
1283     4. When UTF-8 mode was not set, PCRE looped when compiling certain patterns
1284     containing an extended class (one that cannot be represented by a bitmap
1285     because it contains high-valued characters or Unicode property items, e.g.
1286     [\pZ]). Almost always one would set UTF-8 mode when processing such a
1287     pattern, but PCRE should not loop if you do not (it no longer does).
1288     [Detail: two cases were found: (a) a repeated subpattern containing an
1289     extended class; (b) a recursive reference to a subpattern that followed a
1290     previous extended class. It wasn't skipping over the extended class
1291     correctly when UTF-8 mode was not set.]
1293     5. A negated single-character class was not being recognized as fixed-length
1294     in lookbehind assertions such as (?<=[^f]), leading to an incorrect
1295     compile error "lookbehind assertion is not fixed length".
1297     6. The RunPerlTest auxiliary script was showing an unexpected difference
1298     between PCRE and Perl for UTF-8 tests. It turns out that it is hard to
1299     write a Perl script that can interpret lines of an input file either as
1300     byte characters or as UTF-8, which is what "perltest" was being required to
1301     do for the non-UTF-8 and UTF-8 tests, respectively. Essentially what you
1302     can't do is switch easily at run time between having the "use utf8;" pragma
1303     or not. In the end, I fudged it by using the RunPerlTest script to insert
1304     "use utf8;" explicitly for the UTF-8 tests.
1306     7. In multiline (/m) mode, PCRE was matching ^ after a terminating newline at
1307     the end of the subject string, contrary to the documentation and to what
1308     Perl does. This was true of both matching functions. Now it matches only at
1309     the start of the subject and immediately after *internal* newlines.
1311     8. A call of pcre_fullinfo() from pcretest to get the option bits was passing
1312     a pointer to an int instead of a pointer to an unsigned long int. This
1313     caused problems on 64-bit systems.
1315     9. Applied a patch from the folks at Google to pcrecpp.cc, to fix "another
1316     instance of the 'standard' template library not being so standard".
1318     10. There was no check on the number of named subpatterns nor the maximum
1319     length of a subpattern name. The product of these values is used to compute
1320     the size of the memory block for a compiled pattern. By supplying a very
1321     long subpattern name and a large number of named subpatterns, the size
1322     computation could be caused to overflow. This is now prevented by limiting
1323     the length of names to 32 characters, and the number of named subpatterns
1324     to 10,000.
1326     11. Subpatterns that are repeated with specific counts have to be replicated in
1327     the compiled pattern. The size of memory for this was computed from the
1328     length of the subpattern and the repeat count. The latter is limited to
1329     65535, but there was no limit on the former, meaning that integer overflow
1330     could in principle occur. The compiled length of a repeated subpattern is
1331     now limited to 30,000 bytes in order to prevent this.
1333     12. Added the optional facility to have named substrings with the same name.
1335     13. Added the ability to use a named substring as a condition, using the
1336     Python syntax: (?(name)yes|no). This overloads (?(R)... and names that
1337     are numbers (not recommended). Forward references are permitted.
1339     14. Added forward references in named backreferences (if you see what I mean).
1341     15. In UTF-8 mode, with the PCRE_DOTALL option set, a quantified dot in the
1342     pattern could run off the end of the subject. For example, the pattern
1343     "(?s)(.{1,5})"8 did this with the subject "ab".
1345     16. If PCRE_DOTALL or PCRE_MULTILINE were set, pcre_dfa_exec() behaved as if
1346     PCRE_CASELESS was set when matching characters that were quantified with ?
1347     or *.
1349     17. A character class other than a single negated character that had a minimum
1350     but no maximum quantifier - for example [ab]{6,} - was not handled
1351     correctly by pce_dfa_exec(). It would match only one character.
1353     18. A valid (though odd) pattern that looked like a POSIX character
1354     class but used an invalid character after [ (for example [[,abc,]]) caused
1355     pcre_compile() to give the error "Failed: internal error: code overflow" or
1356     in some cases to crash with a glibc free() error. This could even happen if
1357     the pattern terminated after [[ but there just happened to be a sequence of
1358     letters, a binary zero, and a closing ] in the memory that followed.
1360     19. Perl's treatment of octal escapes in the range \400 to \777 has changed
1361     over the years. Originally (before any Unicode support), just the bottom 8
1362     bits were taken. Thus, for example, \500 really meant \100. Nowadays the
1363     output from "man perlunicode" includes this:
1365     The regular expression compiler produces polymorphic opcodes. That
1366     is, the pattern adapts to the data and automatically switches to
1367     the Unicode character scheme when presented with Unicode data--or
1368     instead uses a traditional byte scheme when presented with byte
1369     data.
1371     Sadly, a wide octal escape does not cause a switch, and in a string with
1372     no other multibyte characters, these octal escapes are treated as before.
1373     Thus, in Perl, the pattern /\500/ actually matches \100 but the pattern
1374     /\500|\x{1ff}/ matches \500 or \777 because the whole thing is treated as a
1375     Unicode string.
1377     I have not perpetrated such confusion in PCRE. Up till now, it took just
1378     the bottom 8 bits, as in old Perl. I have now made octal escapes with
1379     values greater than \377 illegal in non-UTF-8 mode. In UTF-8 mode they
1380     translate to the appropriate multibyte character.
1382     29. Applied some refactoring to reduce the number of warnings from Microsoft
1383     and Borland compilers. This has included removing the fudge introduced
1384     seven years ago for the OS/2 compiler (see 2.02/2 below) because it caused
1385     a warning about an unused variable.
1387     21. PCRE has not included VT (character 0x0b) in the set of whitespace
1388     characters since release 4.0, because Perl (from release 5.004) does not.
1389     [Or at least, is documented not to: some releases seem to be in conflict
1390     with the documentation.] However, when a pattern was studied with
1391     pcre_study() and all its branches started with \s, PCRE still included VT
1392     as a possible starting character. Of course, this did no harm; it just
1393     caused an unnecessary match attempt.
1395     22. Removed a now-redundant internal flag bit that recorded the fact that case
1396     dependency changed within the pattern. This was once needed for "required
1397     byte" processing, but is no longer used. This recovers a now-scarce options
1398     bit. Also moved the least significant internal flag bit to the most-
1399     significant bit of the word, which was not previously used (hangover from
1400     the days when it was an int rather than a uint) to free up another bit for
1401     the future.
1403     23. Added support for CRLF line endings as well as CR and LF. As well as the
1404     default being selectable at build time, it can now be changed at runtime
1405     via the PCRE_NEWLINE_xxx flags. There are now options for pcregrep to
1406     specify that it is scanning data with non-default line endings.
1408     24. Changed the definition of CXXLINK to make it agree with the definition of
1409     LINK in the Makefile, by replacing LDFLAGS to CXXFLAGS.
1411     25. Applied Ian Taylor's patches to avoid using another stack frame for tail
1412     recursions. This makes a big different to stack usage for some patterns.
1414     26. If a subpattern containing a named recursion or subroutine reference such
1415     as (?P>B) was quantified, for example (xxx(?P>B)){3}, the calculation of
1416     the space required for the compiled pattern went wrong and gave too small a
1417     value. Depending on the environment, this could lead to "Failed: internal
1418     error: code overflow at offset 49" or "glibc detected double free or
1419     corruption" errors.
1421     27. Applied patches from Google (a) to support the new newline modes and (b) to
1422     advance over multibyte UTF-8 characters in GlobalReplace.
1424     28. Change free() to pcre_free() in pcredemo.c. Apparently this makes a
1425     difference for some implementation of PCRE in some Windows version.
1427     29. Added some extra testing facilities to pcretest:
1429     \q<number> in a data line sets the "match limit" value
1430     \Q<number> in a data line sets the "match recursion limt" value
1431     -S <number> sets the stack size, where <number> is in megabytes
1433     The -S option isn't available for Windows.
1436 nigel 89 Version 6.6 06-Feb-06
1437     ---------------------
1439     1. Change 16(a) for 6.5 broke things, because PCRE_DATA_SCOPE was not defined
1440     in pcreposix.h. I have copied the definition from pcre.h.
1442     2. Change 25 for 6.5 broke compilation in a build directory out-of-tree
1443     because pcre.h is no longer a built file.
1445     3. Added Jeff Friedl's additional debugging patches to pcregrep. These are
1446     not normally included in the compiled code.
1449 nigel 87 Version 6.5 01-Feb-06
1450     ---------------------
1452     1. When using the partial match feature with pcre_dfa_exec(), it was not
1453     anchoring the second and subsequent partial matches at the new starting
1454     point. This could lead to incorrect results. For example, with the pattern
1455     /1234/, partially matching against "123" and then "a4" gave a match.
1457     2. Changes to pcregrep:
1459     (a) All non-match returns from pcre_exec() were being treated as failures
1460     to match the line. Now, unless the error is PCRE_ERROR_NOMATCH, an
1461     error message is output. Some extra information is given for the
1463     probably the only errors that are likely to be caused by users (by
1464     specifying a regex that has nested indefinite repeats, for instance).
1465     If there are more than 20 of these errors, pcregrep is abandoned.
1467     (b) A binary zero was treated as data while matching, but terminated the
1468     output line if it was written out. This has been fixed: binary zeroes
1469     are now no different to any other data bytes.
1471     (c) Whichever of the LC_ALL or LC_CTYPE environment variables is set is
1472     used to set a locale for matching. The --locale=xxxx long option has
1473     been added (no short equivalent) to specify a locale explicitly on the
1474     pcregrep command, overriding the environment variables.
1476     (d) When -B was used with -n, some line numbers in the output were one less
1477     than they should have been.
1479     (e) Added the -o (--only-matching) option.
1481     (f) If -A or -C was used with -c (count only), some lines of context were
1482     accidentally printed for the final match.
1484     (g) Added the -H (--with-filename) option.
1486     (h) The combination of options -rh failed to suppress file names for files
1487     that were found from directory arguments.
1489     (i) Added the -D (--devices) and -d (--directories) options.
1491     (j) Added the -F (--fixed-strings) option.
1493     (k) Allow "-" to be used as a file name for -f as well as for a data file.
1495     (l) Added the --colo(u)r option.
1497     (m) Added Jeffrey Friedl's -S testing option, but within #ifdefs so that it
1498     is not present by default.
1500     3. A nasty bug was discovered in the handling of recursive patterns, that is,
1501     items such as (?R) or (?1), when the recursion could match a number of
1502     alternatives. If it matched one of the alternatives, but subsequently,
1503     outside the recursion, there was a failure, the code tried to back up into
1504     the recursion. However, because of the way PCRE is implemented, this is not
1505     possible, and the result was an incorrect result from the match.
1507     In order to prevent this happening, the specification of recursion has
1508     been changed so that all such subpatterns are automatically treated as
1509     atomic groups. Thus, for example, (?R) is treated as if it were (?>(?R)).
1511     4. I had overlooked the fact that, in some locales, there are characters for
1512     which isalpha() is true but neither isupper() nor islower() are true. In
1513     the fr_FR locale, for instance, the \xAA and \xBA characters (ordmasculine
1514     and ordfeminine) are like this. This affected the treatment of \w and \W
1515     when they appeared in character classes, but not when they appeared outside
1516     a character class. The bit map for "word" characters is now created
1517     separately from the results of isalnum() instead of just taking it from the
1518     upper, lower, and digit maps. (Plus the underscore character, of course.)
1520     5. The above bug also affected the handling of POSIX character classes such as
1521     [[:alpha:]] and [[:alnum:]]. These do not have their own bit maps in PCRE's
1522     permanent tables. Instead, the bit maps for such a class were previously
1523     created as the appropriate unions of the upper, lower, and digit bitmaps.
1524     Now they are created by subtraction from the [[:word:]] class, which has
1525     its own bitmap.
1527     6. The [[:blank:]] character class matches horizontal, but not vertical space.
1528     It is created by subtracting the vertical space characters (\x09, \x0a,
1529     \x0b, \x0c) from the [[:space:]] bitmap. Previously, however, the
1530     subtraction was done in the overall bitmap for a character class, meaning
1531     that a class such as [\x0c[:blank:]] was incorrect because \x0c would not
1532     be recognized. This bug has been fixed.
1534     7. Patches from the folks at Google:
1536     (a) pcrecpp.cc: "to handle a corner case that may or may not happen in
1537     real life, but is still worth protecting against".
1539     (b) pcrecpp.cc: "corrects a bug when negative radixes are used with
1540     regular expressions".
1542     (c) pcre_scanner.cc: avoid use of std::count() because not all systems
1543     have it.
1545     (d) Split off pcrecpparg.h from pcrecpp.h and had the former built by
1546     "configure" and the latter not, in order to fix a problem somebody had
1547     with compiling the Arg class on HP-UX.
1549     (e) Improve the error-handling of the C++ wrapper a little bit.
1551     (f) New tests for checking recursion limiting.
1553     8. The pcre_memmove() function, which is used only if the environment does not
1554     have a standard memmove() function (and is therefore rarely compiled),
1555     contained two bugs: (a) use of int instead of size_t, and (b) it was not
1556     returning a result (though PCRE never actually uses the result).
1558     9. In the POSIX regexec() interface, if nmatch is specified as a ridiculously
1559     large number - greater than INT_MAX/(3*sizeof(int)) - REG_ESPACE is
1560     returned instead of calling malloc() with an overflowing number that would
1561     most likely cause subsequent chaos.
1563     10. The debugging option of pcretest was not showing the NO_AUTO_CAPTURE flag.
1565     11. The POSIX flag REG_NOSUB is now supported. When a pattern that was compiled
1566     with this option is matched, the nmatch and pmatch options of regexec() are
1567     ignored.
1569     12. Added REG_UTF8 to the POSIX interface. This is not defined by POSIX, but is
1570     provided in case anyone wants to the the POSIX interface with UTF-8
1571     strings.
1573     13. Added CXXLDFLAGS to the Makefile parameters to provide settings only on the
1574     C++ linking (needed for some HP-UX environments).
1576     14. Avoid compiler warnings in get_ucpname() when compiled without UCP support
1577     (unused parameter) and in the pcre_printint() function (omitted "default"
1578     switch label when the default is to do nothing).
1580     15. Added some code to make it possible, when PCRE is compiled as a C++
1581     library, to replace subject pointers for pcre_exec() with a smart pointer
1582     class, thus making it possible to process discontinuous strings.
1584     16. The two macros PCRE_EXPORT and PCRE_DATA_SCOPE are confusing, and perform
1585     much the same function. They were added by different people who were trying
1586     to make PCRE easy to compile on non-Unix systems. It has been suggested
1587     that PCRE_EXPORT be abolished now that there is more automatic apparatus
1588     for compiling on Windows systems. I have therefore replaced it with
1589     PCRE_DATA_SCOPE. This is set automatically for Windows; if not set it
1590     defaults to "extern" for C or "extern C" for C++, which works fine on
1591     Unix-like systems. It is now possible to override the value of PCRE_DATA_
1592     SCOPE with something explicit in config.h. In addition:
1594     (a) pcreposix.h still had just "extern" instead of either of these macros;
1595     I have replaced it with PCRE_DATA_SCOPE.
1597     (b) Functions such as _pcre_xclass(), which are internal to the library,
1598     but external in the C sense, all had PCRE_EXPORT in their definitions.
1599     This is apparently wrong for the Windows case, so I have removed it.
1600     (It makes no difference on Unix-like systems.)
1602     17. Added a new limit, MATCH_LIMIT_RECURSION, which limits the depth of nesting
1603     of recursive calls to match(). This is different to MATCH_LIMIT because
1604     that limits the total number of calls to match(), not all of which increase
1605     the depth of recursion. Limiting the recursion depth limits the amount of
1606     stack (or heap if NO_RECURSE is set) that is used. The default can be set
1607     when PCRE is compiled, and changed at run time. A patch from Google adds
1608     this functionality to the C++ interface.
1610     18. Changes to the handling of Unicode character properties:
1612     (a) Updated the table to Unicode 4.1.0.
1614     (b) Recognize characters that are not in the table as "Cn" (undefined).
1616     (c) I revised the way the table is implemented to a much improved format
1617     which includes recognition of ranges. It now supports the ranges that
1618     are defined in UnicodeData.txt, and it also amalgamates other
1619     characters into ranges. This has reduced the number of entries in the
1620     table from around 16,000 to around 3,000, thus reducing its size
1621     considerably. I realized I did not need to use a tree structure after
1622     all - a binary chop search is just as efficient. Having reduced the
1623     number of entries, I extended their size from 6 bytes to 8 bytes to
1624     allow for more data.
1626     (d) Added support for Unicode script names via properties such as \p{Han}.
1628     19. In UTF-8 mode, a backslash followed by a non-Ascii character was not
1629     matching that character.
1631     20. When matching a repeated Unicode property with a minimum greater than zero,
1632     (for example \pL{2,}), PCRE could look past the end of the subject if it
1633     reached it while seeking the minimum number of characters. This could
1634     happen only if some of the characters were more than one byte long, because
1635     there is a check for at least the minimum number of bytes.
1637     21. Refactored the implementation of \p and \P so as to be more general, to
1638     allow for more different types of property in future. This has changed the
1639     compiled form incompatibly. Anybody with saved compiled patterns that use
1640     \p or \P will have to recompile them.
1642     22. Added "Any" and "L&" to the supported property types.
1644     23. Recognize \x{...} as a code point specifier, even when not in UTF-8 mode,
1645     but give a compile time error if the value is greater than 0xff.
1647     24. The man pages for pcrepartial, pcreprecompile, and pcre_compile2 were
1648     accidentally not being installed or uninstalled.
1650     25. The pcre.h file was built from pcre.h.in, but the only changes that were
1651     made were to insert the current release number. This seemed silly, because
1652     it made things harder for people building PCRE on systems that don't run
1653     "configure". I have turned pcre.h into a distributed file, no longer built
1654     by "configure", with the version identification directly included. There is
1655     no longer a pcre.h.in file.
1657     However, this change necessitated a change to the pcre-config script as
1658     well. It is built from pcre-config.in, and one of the substitutions was the
1659     release number. I have updated configure.ac so that ./configure now finds
1660     the release number by grepping pcre.h.
1662     26. Added the ability to run the tests under valgrind.
1665 nigel 85 Version 6.4 05-Sep-05
1666     ---------------------
1668     1. Change 6.0/10/(l) to pcregrep introduced a bug that caused separator lines
1669     "--" to be printed when multiple files were scanned, even when none of the
1670     -A, -B, or -C options were used. This is not compatible with Gnu grep, so I
1671     consider it to be a bug, and have restored the previous behaviour.
1673     2. A couple of code tidies to get rid of compiler warnings.
1675     3. The pcretest program used to cheat by referring to symbols in the library
1676     whose names begin with _pcre_. These are internal symbols that are not
1677     really supposed to be visible externally, and in some environments it is
1678     possible to suppress them. The cheating is now confined to including
1679     certain files from the library's source, which is a bit cleaner.
1681     4. Renamed pcre.in as pcre.h.in to go with pcrecpp.h.in; it also makes the
1682     file's purpose clearer.
1684     5. Reorganized pcre_ucp_findchar().
1687 nigel 83 Version 6.3 15-Aug-05
1688     ---------------------
1690     1. The file libpcre.pc.in did not have general read permission in the tarball.
1692     2. There were some problems when building without C++ support:
1694     (a) If C++ support was not built, "make install" and "make test" still
1695     tried to test it.
1697     (b) There were problems when the value of CXX was explicitly set. Some
1698     changes have been made to try to fix these, and ...
1700     (c) --disable-cpp can now be used to explicitly disable C++ support.
1702     (d) The use of @CPP_OBJ@ directly caused a blank line preceded by a
1703     backslash in a target when C++ was disabled. This confuses some
1704     versions of "make", apparently. Using an intermediate variable solves
1705     this. (Same for CPP_LOBJ.)
1707     3. $(LINK_FOR_BUILD) now includes $(CFLAGS_FOR_BUILD) and $(LINK)
1708     (non-Windows) now includes $(CFLAGS) because these flags are sometimes
1709     necessary on certain architectures.
1711     4. Added a setting of -export-symbols-regex to the link command to remove
1712     those symbols that are exported in the C sense, but actually are local
1713     within the library, and not documented. Their names all begin with
1714     "_pcre_". This is not a perfect job, because (a) we have to except some
1715     symbols that pcretest ("illegally") uses, and (b) the facility isn't always
1716     available (and never for static libraries). I have made a note to try to
1717     find a way round (a) in the future.
1720 nigel 81 Version 6.2 01-Aug-05
1721     ---------------------
1723     1. There was no test for integer overflow of quantifier values. A construction
1724     such as {1111111111111111} would give undefined results. What is worse, if
1725     a minimum quantifier for a parenthesized subpattern overflowed and became
1726     negative, the calculation of the memory size went wrong. This could have
1727     led to memory overwriting.
1729     2. Building PCRE using VPATH was broken. Hopefully it is now fixed.
1731     3. Added "b" to the 2nd argument of fopen() in dftables.c, for non-Unix-like
1732     operating environments where this matters.
1734     4. Applied Giuseppe Maxia's patch to add additional features for controlling
1735     PCRE options from within the C++ wrapper.
1737     5. Named capturing subpatterns were not being correctly counted when a pattern
1738     was compiled. This caused two problems: (a) If there were more than 100
1739     such subpatterns, the calculation of the memory needed for the whole
1740     compiled pattern went wrong, leading to an overflow error. (b) Numerical
1741     back references of the form \12, where the number was greater than 9, were
1742     not recognized as back references, even though there were sufficient
1743     previous subpatterns.
1745     6. Two minor patches to pcrecpp.cc in order to allow it to compile on older
1746     versions of gcc, e.g. 2.95.4.
1749 nigel 79 Version 6.1 21-Jun-05
1750     ---------------------
1752     1. There was one reference to the variable "posix" in pcretest.c that was not
1753     surrounded by "#if !defined NOPOSIX".
1755     2. Make it possible to compile pcretest without DFA support, UTF8 support, or
1756     the cross-check on the old pcre_info() function, for the benefit of the
1757     cut-down version of PCRE that is currently imported into Exim.
1759     3. A (silly) pattern starting with (?i)(?-i) caused an internal space
1760     allocation error. I've done the easy fix, which wastes 2 bytes for sensible
1761     patterns that start (?i) but I don't think that matters. The use of (?i) is
1762     just an example; this all applies to the other options as well.
1764     4. Since libtool seems to echo the compile commands it is issuing, the output
1765     from "make" can be reduced a bit by putting "@" in front of each libtool
1766     compile command.
1768     5. Patch from the folks at Google for configure.in to be a bit more thorough
1769     in checking for a suitable C++ installation before trying to compile the
1770     C++ stuff. This should fix a reported problem when a compiler was present,
1771     but no suitable headers.
1773     6. The man pages all had just "PCRE" as their title. I have changed them to
1774     be the relevant file name. I have also arranged that these names are
1775     retained in the file doc/pcre.txt, which is a concatenation in text format
1776     of all the man pages except the little individual ones for each function.
1778     7. The NON-UNIX-USE file had not been updated for the different set of source
1779     files that come with release 6. I also added a few comments about the C++
1780     wrapper.
1783 nigel 77 Version 6.0 07-Jun-05
1784     ---------------------
1786     1. Some minor internal re-organization to help with my DFA experiments.
1788     2. Some missing #ifdef SUPPORT_UCP conditionals in pcretest and printint that
1789     didn't matter for the library itself when fully configured, but did matter
1790     when compiling without UCP support, or within Exim, where the ucp files are
1791     not imported.
1793     3. Refactoring of the library code to split up the various functions into
1794     different source modules. The addition of the new DFA matching code (see
1795     below) to a single monolithic source would have made it really too
1796     unwieldy, quite apart from causing all the code to be include in a
1797     statically linked application, when only some functions are used. This is
1798     relevant even without the DFA addition now that patterns can be compiled in
1799     one application and matched in another.
1801     The downside of splitting up is that there have to be some external
1802     functions and data tables that are used internally in different modules of
1803     the library but which are not part of the API. These have all had their
1804     names changed to start with "_pcre_" so that they are unlikely to clash
1805     with other external names.
1807     4. Added an alternate matching function, pcre_dfa_exec(), which matches using
1808     a different (DFA) algorithm. Although it is slower than the original
1809     function, it does have some advantages for certain types of matching
1810     problem.
1812     5. Upgrades to pcretest in order to test the features of pcre_dfa_exec(),
1813     including restarting after a partial match.
1815     6. A patch for pcregrep that defines INVALID_FILE_ATTRIBUTES if it is not
1816     defined when compiling for Windows was sent to me. I have put it into the
1817     code, though I have no means of testing or verifying it.
1819     7. Added the pcre_refcount() auxiliary function.
1821     8. Added the PCRE_FIRSTLINE option. This constrains an unanchored pattern to
1822     match before or at the first newline in the subject string. In pcretest,
1823     the /f option on a pattern can be used to set this.
1825     9. A repeated \w when used in UTF-8 mode with characters greater than 256
1826     would behave wrongly. This has been present in PCRE since release 4.0.
1828     10. A number of changes to the pcregrep command:
1830     (a) Refactored how -x works; insert ^(...)$ instead of setting
1831     PCRE_ANCHORED and checking the length, in preparation for adding
1832     something similar for -w.
1834     (b) Added the -w (match as a word) option.
1836     (c) Refactored the way lines are read and buffered so as to have more
1837     than one at a time available.
1839     (d) Implemented a pcregrep test script.
1841     (e) Added the -M (multiline match) option. This allows patterns to match
1842     over several lines of the subject. The buffering ensures that at least
1843     8K, or the rest of the document (whichever is the shorter) is available
1844     for matching (and similarly the previous 8K for lookbehind assertions).
1846     (f) Changed the --help output so that it now says
1848     -w, --word-regex(p)
1850     instead of two lines, one with "regex" and the other with "regexp"
1851     because that confused at least one person since the short forms are the
1852     same. (This required a bit of code, as the output is generated
1853     automatically from a table. It wasn't just a text change.)
1855     (g) -- can be used to terminate pcregrep options if the next thing isn't an
1856     option but starts with a hyphen. Could be a pattern or a path name
1857     starting with a hyphen, for instance.
1859     (h) "-" can be given as a file name to represent stdin.
1861     (i) When file names are being printed, "(standard input)" is used for
1862     the standard input, for compatibility with GNU grep. Previously
1863     "<stdin>" was used.
1865     (j) The option --label=xxx can be used to supply a name to be used for
1866     stdin when file names are being printed. There is no short form.
1868     (k) Re-factored the options decoding logic because we are going to add
1869     two more options that take data. Such options can now be given in four
1870     different ways, e.g. "-fname", "-f name", "--file=name", "--file name".
1872     (l) Added the -A, -B, and -C options for requesting that lines of context
1873     around matches be printed.
1875     (m) Added the -L option to print the names of files that do not contain
1876     any matching lines, that is, the complement of -l.
1878     (n) The return code is 2 if any file cannot be opened, but pcregrep does
1879     continue to scan other files.
1881     (o) The -s option was incorrectly implemented. For compatibility with other
1882     greps, it now suppresses the error message for a non-existent or non-
1883     accessible file (but not the return code). There is a new option called
1884     -q that suppresses the output of matching lines, which was what -s was
1885     previously doing.
1887     (p) Added --include and --exclude options to specify files for inclusion
1888     and exclusion when recursing.
1890     11. The Makefile was not using the Autoconf-supported LDFLAGS macro properly.
1891     Hopefully, it now does.
1893     12. Missing cast in pcre_study().
1895     13. Added an "uninstall" target to the makefile.
1897     14. Replaced "extern" in the function prototypes in Makefile.in with
1898     "PCRE_DATA_SCOPE", which defaults to 'extern' or 'extern "C"' in the Unix
1899     world, but is set differently for Windows.
1901     15. Added a second compiling function called pcre_compile2(). The only
1902     difference is that it has an extra argument, which is a pointer to an
1903     integer error code. When there is a compile-time failure, this is set
1904     non-zero, in addition to the error test pointer being set to point to an
1905     error message. The new argument may be NULL if no error number is required
1906     (but then you may as well call pcre_compile(), which is now just a
1907     wrapper). This facility is provided because some applications need a
1908     numeric error indication, but it has also enabled me to tidy up the way
1909     compile-time errors are handled in the POSIX wrapper.
1911     16. Added VPATH=.libs to the makefile; this should help when building with one
1912     prefix path and installing with another. (Or so I'm told by someone who
1913     knows more about this stuff than I do.)
1915     17. Added a new option, REG_DOTALL, to the POSIX function regcomp(). This
1916     passes PCRE_DOTALL to the pcre_compile() function, making the "." character
1917     match everything, including newlines. This is not POSIX-compatible, but
1918     somebody wanted the feature. From pcretest it can be activated by using
1919     both the P and the s flags.
1921     18. AC_PROG_LIBTOOL appeared twice in Makefile.in. Removed one.
1923     19. libpcre.pc was being incorrectly installed as executable.
1925     20. A couple of places in pcretest check for end-of-line by looking for '\n';
1926     it now also looks for '\r' so that it will work unmodified on Windows.
1928     21. Added Google's contributed C++ wrapper to the distribution.
1930     22. Added some untidy missing memory free() calls in pcretest, to keep
1931     Electric Fence happy when testing.
1935 nigel 75 Version 5.0 13-Sep-04
1936     ---------------------
1938     1. Internal change: literal characters are no longer packed up into items
1939     containing multiple characters in a single byte-string. Each character
1940     is now matched using a separate opcode. However, there may be more than one
1941     byte in the character in UTF-8 mode.
1943     2. The pcre_callout_block structure has two new fields: pattern_position and
1944     next_item_length. These contain the offset in the pattern to the next match
1945     item, and its length, respectively.
1947     3. The PCRE_AUTO_CALLOUT option for pcre_compile() requests the automatic
1948     insertion of callouts before each pattern item. Added the /C option to
1949     pcretest to make use of this.
1951     4. On the advice of a Windows user, the lines
1953     #if defined(_WIN32) || defined(WIN32)
1954     _setmode( _fileno( stdout ), 0x8000 );
1955     #endif /* defined(_WIN32) || defined(WIN32) */
1957     have been added to the source of pcretest. This apparently does useful
1958     magic in relation to line terminators.
1960     5. Changed "r" and "w" in the calls to fopen() in pcretest to "rb" and "wb"
1961     for the benefit of those environments where the "b" makes a difference.
1963     6. The icc compiler has the same options as gcc, but "configure" doesn't seem
1964     to know about it. I have put a hack into configure.in that adds in code
1965     to set GCC=yes if CC=icc. This seems to end up at a point in the
1966     generated configure script that is early enough to affect the setting of
1967     compiler options, which is what is needed, but I have no means of testing
1968     whether it really works. (The user who reported this had patched the
1969     generated configure script, which of course I cannot do.)
1971     LATER: After change 22 below (new libtool files), the configure script
1972     seems to know about icc (and also ecc). Therefore, I have commented out
1973     this hack in configure.in.
1975     7. Added support for pkg-config (2 patches were sent in).
1977     8. Negated POSIX character classes that used a combination of internal tables
1978     were completely broken. These were [[:^alpha:]], [[:^alnum:]], and
1979     [[:^ascii]]. Typically, they would match almost any characters. The other
1980     POSIX classes were not broken in this way.
1982     9. Matching the pattern "\b.*?" against "ab cd", starting at offset 1, failed
1983     to find the match, as PCRE was deluded into thinking that the match had to
1984     start at the start point or following a newline. The same bug applied to
1985     patterns with negative forward assertions or any backward assertions
1986     preceding ".*" at the start, unless the pattern required a fixed first
1987     character. This was a failing pattern: "(?!.bcd).*". The bug is now fixed.
1989     10. In UTF-8 mode, when moving forwards in the subject after a failed match
1990     starting at the last subject character, bytes beyond the end of the subject
1991     string were read.
1993     11. Renamed the variable "class" as "classbits" to make life easier for C++
1994     users. (Previously there was a macro definition, but it apparently wasn't
1995     enough.)
1997     12. Added the new field "tables" to the extra data so that tables can be passed
1998     in at exec time, or the internal tables can be re-selected. This allows
1999     a compiled regex to be saved and re-used at a later time by a different
2000     program that might have everything at different addresses.
2002     13. Modified the pcre-config script so that, when run on Solaris, it shows a
2003     -R library as well as a -L library.
2005     14. The debugging options of pcretest (-d on the command line or D on a
2006     pattern) showed incorrect output for anything following an extended class
2007     that contained multibyte characters and which was followed by a quantifier.
2009     15. Added optional support for general category Unicode character properties
2010     via the \p, \P, and \X escapes. Unicode property support implies UTF-8
2011     support. It adds about 90K to the size of the library. The meanings of the
2012     inbuilt class escapes such as \d and \s have NOT been changed.
2014     16. Updated pcredemo.c to include calls to free() to release the memory for the
2015     compiled pattern.
2017     17. The generated file chartables.c was being created in the source directory
2018     instead of in the building directory. This caused the build to fail if the
2019     source directory was different from the building directory, and was
2020     read-only.
2022     18. Added some sample Win commands from Mark Tetrode into the NON-UNIX-USE
2023     file. No doubt somebody will tell me if they don't make sense... Also added
2024     Dan Mooney's comments about building on OpenVMS.
2026     19. Added support for partial matching via the PCRE_PARTIAL option for
2027     pcre_exec() and the \P data escape in pcretest.
2029     20. Extended pcretest with 3 new pattern features:
2031     (i) A pattern option of the form ">rest-of-line" causes pcretest to
2032     write the compiled pattern to the file whose name is "rest-of-line".
2033     This is a straight binary dump of the data, with the saved pointer to
2034     the character tables forced to be NULL. The study data, if any, is
2035     written too. After writing, pcretest reads a new pattern.
2037     (ii) If, instead of a pattern, "<rest-of-line" is given, pcretest reads a
2038     compiled pattern from the given file. There must not be any
2039     occurrences of "<" in the file name (pretty unlikely); if there are,
2040     pcretest will instead treat the initial "<" as a pattern delimiter.
2041     After reading in the pattern, pcretest goes on to read data lines as
2042     usual.
2044     (iii) The F pattern option causes pcretest to flip the bytes in the 32-bit
2045     and 16-bit fields in a compiled pattern, to simulate a pattern that
2046     was compiled on a host of opposite endianness.
2048     21. The pcre-exec() function can now cope with patterns that were compiled on
2049     hosts of opposite endianness, with this restriction:
2051     As for any compiled expression that is saved and used later, the tables
2052     pointer field cannot be preserved; the extra_data field in the arguments
2053     to pcre_exec() should be used to pass in a tables address if a value
2054     other than the default internal tables were used at compile time.
2056     22. Calling pcre_exec() with a negative value of the "ovecsize" parameter is
2057     now diagnosed as an error. Previously, most of the time, a negative number
2058     would have been treated as zero, but if in addition "ovector" was passed as
2059     NULL, a crash could occur.
2061     23. Updated the files ltmain.sh, config.sub, config.guess, and aclocal.m4 with
2062     new versions from the libtool 1.5 distribution (the last one is a copy of
2063     a file called libtool.m4). This seems to have fixed the need to patch
2064     "configure" to support Darwin 1.3 (which I used to do). However, I still
2065     had to patch ltmain.sh to ensure that ${SED} is set (it isn't on my
2066     workstation).
2068     24. Changed the PCRE licence to be the more standard "BSD" licence.
2071 nigel 73 Version 4.5 01-Dec-03
2072     ---------------------
2074     1. There has been some re-arrangement of the code for the match() function so
2075     that it can be compiled in a version that does not call itself recursively.
2076     Instead, it keeps those local variables that need separate instances for
2077     each "recursion" in a frame on the heap, and gets/frees frames whenever it
2078     needs to "recurse". Keeping track of where control must go is done by means
2079     of setjmp/longjmp. The whole thing is implemented by a set of macros that
2080     hide most of the details from the main code, and operates only if
2081     NO_RECURSE is defined while compiling pcre.c. If PCRE is built using the
2082     "configure" mechanism, "--disable-stack-for-recursion" turns on this way of
2083     operating.
2085     To make it easier for callers to provide specially tailored get/free
2086     functions for this usage, two new functions, pcre_stack_malloc, and
2087     pcre_stack_free, are used. They are always called in strict stacking order,
2088     and the size of block requested is always the same.
2090     The PCRE_CONFIG_STACKRECURSE info parameter can be used to find out whether
2091     PCRE has been compiled to use the stack or the heap for recursion. The
2092     -C option of pcretest uses this to show which version is compiled.
2094     A new data escape \S, is added to pcretest; it causes the amounts of store
2095     obtained and freed by both kinds of malloc/free at match time to be added
2096     to the output.
2098     2. Changed the locale test to use "fr_FR" instead of "fr" because that's
2099     what's available on my current Linux desktop machine.
2101     3. When matching a UTF-8 string, the test for a valid string at the start has
2102     been extended. If start_offset is not zero, PCRE now checks that it points
2103     to a byte that is the start of a UTF-8 character. If not, it returns
2104     PCRE_ERROR_BADUTF8_OFFSET (-11). Note: the whole string is still checked;
2105     this is necessary because there may be backward assertions in the pattern.
2106     When matching the same subject several times, it may save resources to use
2107     PCRE_NO_UTF8_CHECK on all but the first call if the string is long.
2109     4. The code for checking the validity of UTF-8 strings has been tightened so
2110     that it rejects (a) strings containing 0xfe or 0xff bytes and (b) strings
2111     containing "overlong sequences".
2113     5. Fixed a bug (appearing twice) that I could not find any way of exploiting!
2114     I had written "if ((digitab[*p++] && chtab_digit) == 0)" where the "&&"
2115     should have been "&", but it just so happened that all the cases this let
2116     through by mistake were picked up later in the function.
2118     6. I had used a variable called "isblank" - this is a C99 function, causing
2119     some compilers to warn. To avoid this, I renamed it (as "blankclass").
2121     7. Cosmetic: (a) only output another newline at the end of pcretest if it is
2122     prompting; (b) run "./pcretest /dev/null" at the start of the test script
2123     so the version is shown; (c) stop "make test" echoing "./RunTest".
2125     8. Added patches from David Burgess to enable PCRE to run on EBCDIC systems.
2127     9. The prototype for memmove() for systems that don't have it was using
2128     size_t, but the inclusion of the header that defines size_t was later. I've
2129     moved the #includes for the C headers earlier to avoid this.
2131     10. Added some adjustments to the code to make it easier to compiler on certain
2132     special systems:
2134     (a) Some "const" qualifiers were missing.
2135     (b) Added the macro EXPORT before all exported functions; by default this
2136     is defined to be empty.
2137     (c) Changed the dftables auxiliary program (that builds chartables.c) so
2138     that it reads its output file name as an argument instead of writing
2139     to the standard output and assuming this can be redirected.
2141     11. In UTF-8 mode, if a recursive reference (e.g. (?1)) followed a character
2142     class containing characters with values greater than 255, PCRE compilation
2143     went into a loop.
2145     12. A recursive reference to a subpattern that was within another subpattern
2146     that had a minimum quantifier of zero caused PCRE to crash. For example,
2147     (x(y(?2))z)? provoked this bug with a subject that got as far as the
2148     recursion. If the recursively-called subpattern itself had a zero repeat,
2149     that was OK.
2151     13. In pcretest, the buffer for reading a data line was set at 30K, but the
2152     buffer into which it was copied (for escape processing) was still set at
2153     1024, so long lines caused crashes.
2155     14. A pattern such as /[ab]{1,3}+/ failed to compile, giving the error
2156     "internal error: code overflow...". This applied to any character class
2157     that was followed by a possessive quantifier.
2159     15. Modified the Makefile to add libpcre.la as a prerequisite for
2160     libpcreposix.la because I was told this is needed for a parallel build to
2161     work.
2163     16. If a pattern that contained .* following optional items at the start was
2164     studied, the wrong optimizing data was generated, leading to matching
2165     errors. For example, studying /[ab]*.*c/ concluded, erroneously, that any
2166     matching string must start with a or b or c. The correct conclusion for
2167     this pattern is that a match can start with any character.
2170 nigel 71 Version 4.4 13-Aug-03
2171     ---------------------
2173     1. In UTF-8 mode, a character class containing characters with values between
2174     127 and 255 was not handled correctly if the compiled pattern was studied.
2175     In fixing this, I have also improved the studying algorithm for such
2176     classes (slightly).
2178     2. Three internal functions had redundant arguments passed to them. Removal
2179     might give a very teeny performance improvement.
2181     3. Documentation bug: the value of the capture_top field in a callout is *one
2182     more than* the number of the hightest numbered captured substring.
2184     4. The Makefile linked pcretest and pcregrep with -lpcre, which could result
2185     in incorrectly linking with a previously installed version. They now link
2186     explicitly with libpcre.la.
2188     5. configure.in no longer needs to recognize Cygwin specially.
2190     6. A problem in pcre.in for Windows platforms is fixed.
2192     7. If a pattern was successfully studied, and the -d (or /D) flag was given to
2193     pcretest, it used to include the size of the study block as part of its
2194     output. Unfortunately, the structure contains a field that has a different
2195     size on different hardware architectures. This meant that the tests that
2196     showed this size failed. As the block is currently always of a fixed size,
2197     this information isn't actually particularly useful in pcretest output, so
2198     I have just removed it.
2200     8. Three pre-processor statements accidentally did not start in column 1.
2201     Sadly, there are *still* compilers around that complain, even though
2202     standard C has not required this for well over a decade. Sigh.
2204     9. In pcretest, the code for checking callouts passed small integers in the
2205     callout_data field, which is a void * field. However, some picky compilers
2206     complained about the casts involved for this on 64-bit systems. Now
2207     pcretest passes the address of the small integer instead, which should get
2208     rid of the warnings.
2210     10. By default, when in UTF-8 mode, PCRE now checks for valid UTF-8 strings at
2211     both compile and run time, and gives an error if an invalid UTF-8 sequence
2212     is found. There is a option for disabling this check in cases where the
2213     string is known to be correct and/or the maximum performance is wanted.
2215     11. In response to a bug report, I changed one line in Makefile.in from
2217     -Wl,--out-implib,.libs/lib@WIN_PREFIX@pcreposix.dll.a \
2218     to
2219     -Wl,--out-implib,.libs/@WIN_PREFIX@libpcreposix.dll.a \
2221     to look similar to other lines, but I have no way of telling whether this
2222     is the right thing to do, as I do not use Windows. No doubt I'll get told
2223     if it's wrong...
2226 nigel 69 Version 4.3 21-May-03
2227     ---------------------
2229     1. Two instances of @WIN_PREFIX@ omitted from the Windows targets in the
2230     Makefile.
2232     2. Some refactoring to improve the quality of the code:
2234     (i) The utf8_table... variables are now declared "const".
2236     (ii) The code for \cx, which used the "case flipping" table to upper case
2237     lower case letters, now just substracts 32. This is ASCII-specific,
2238     but the whole concept of \cx is ASCII-specific, so it seems
2239     reasonable.
2241     (iii) PCRE was using its character types table to recognize decimal and
2242     hexadecimal digits in the pattern. This is silly, because it handles
2243     only 0-9, a-f, and A-F, but the character types table is locale-
2244     specific, which means strange things might happen. A private
2245     table is now used for this - though it costs 256 bytes, a table is
2246     much faster than multiple explicit tests. Of course, the standard
2247     character types table is still used for matching digits in subject
2248     strings against \d.
2250     (iv) Strictly, the identifier ESC_t is reserved by POSIX (all identifiers
2251     ending in _t are). So I've renamed it as ESC_tee.
2253     3. The first argument for regexec() in the POSIX wrapper should have been
2254     defined as "const".
2256     4. Changed pcretest to use malloc() for its buffers so that they can be
2257     Electric Fenced for debugging.
2259     5. There were several places in the code where, in UTF-8 mode, PCRE would try
2260     to read one or more bytes before the start of the subject string. Often this
2261     had no effect on PCRE's behaviour, but in some circumstances it could
2262     provoke a segmentation fault.
2264     6. A lookbehind at the start of a pattern in UTF-8 mode could also cause PCRE
2265     to try to read one or more bytes before the start of the subject string.
2267     7. A lookbehind in a pattern matched in non-UTF-8 mode on a PCRE compiled with
2268     UTF-8 support could misbehave in various ways if the subject string
2269     contained bytes with the 0x80 bit set and the 0x40 bit unset in a lookbehind
2270     area. (PCRE was not checking for the UTF-8 mode flag, and trying to move
2271     back over UTF-8 characters.)
2274 nigel 67 Version 4.2 14-Apr-03
2275     ---------------------
2277     1. Typo "#if SUPPORT_UTF8" instead of "#ifdef SUPPORT_UTF8" fixed.
2279     2. Changes to the building process, supplied by Ronald Landheer-Cieslak
2280     [ON_WINDOWS]: new variable, "#" on non-Windows platforms
2281     [NOT_ON_WINDOWS]: new variable, "#" on Windows platforms
2282     [WIN_PREFIX]: new variable, "cyg" for Cygwin
2283     * Makefile.in: use autoconf substitution for OBJEXT, EXEEXT, BUILD_OBJEXT
2284     and BUILD_EXEEXT
2285     Note: automatic setting of the BUILD variables is not yet working
2286     set CPPFLAGS and BUILD_CPPFLAGS (but don't use yet) - should be used at
2287     compile-time but not at link-time
2288     [LINK]: use for linking executables only
2289     make different versions for Windows and non-Windows
2290     [LINKLIB]: new variable, copy of UNIX-style LINK, used for linking
2291     libraries
2292     [LINK_FOR_BUILD]: new variable
2293     [OBJEXT]: use throughout
2294     [EXEEXT]: use throughout
2295     <winshared>: new target
2296     <wininstall>: new target
2297     <dftables.o>: use native compiler
2298     <dftables>: use native linker
2299     <install>: handle Windows platform correctly
2300     <clean>: ditto
2301     <check>: ditto
2302     copy DLL to top builddir before testing
2304     As part of these changes, -no-undefined was removed again. This was reported
2305     to give trouble on HP-UX 11.0, so getting rid of it seems like a good idea
2306     in any case.
2308     3. Some tidies to get rid of compiler warnings:
2310     . In the match_data structure, match_limit was an unsigned long int, whereas
2311     match_call_count was an int. I've made them both unsigned long ints.
2313     . In pcretest the fact that a const uschar * doesn't automatically cast to
2314     a void * provoked a warning.
2316     . Turning on some more compiler warnings threw up some "shadow" variables
2317     and a few more missing casts.
2319     4. If PCRE was complied with UTF-8 support, but called without the PCRE_UTF8
2320     option, a class that contained a single character with a value between 128
2321     and 255 (e.g. /[\xFF]/) caused PCRE to crash.
2323     5. If PCRE was compiled with UTF-8 support, but called without the PCRE_UTF8
2324     option, a class that contained several characters, but with at least one
2325     whose value was between 128 and 255 caused PCRE to crash.
2328 nigel 65 Version 4.1 12-Mar-03
2329     ---------------------
2330 nigel 63
2331 nigel 65 1. Compiling with gcc -pedantic found a couple of places where casts were
2332     needed, and a string in dftables.c that was longer than standard compilers are
2333     required to support.
2335     2. Compiling with Sun's compiler found a few more places where the code could
2336     be tidied up in order to avoid warnings.
2338     3. The variables for cross-compiling were called HOST_CC and HOST_CFLAGS; the
2339     first of these names is deprecated in the latest Autoconf in favour of the name
2340     CC_FOR_BUILD, because "host" is typically used to mean the system on which the
2341     compiled code will be run. I can't find a reference for HOST_CFLAGS, but by
2342     analogy I have changed it to CFLAGS_FOR_BUILD.
2344     4. Added -no-undefined to the linking command in the Makefile, because this is
2345     apparently helpful for Windows. To make it work, also added "-L. -lpcre" to the
2346     linking step for the pcreposix library.
2348     5. PCRE was failing to diagnose the case of two named groups with the same
2349     name.
2351     6. A problem with one of PCRE's optimizations was discovered. PCRE remembers a
2352     literal character that is needed in the subject for a match, and scans along to
2353     ensure that it is present before embarking on the full matching process. This
2354     saves time in cases of nested unlimited repeats that are never going to match.
2355     Problem: the scan can take a lot of time if the subject is very long (e.g.
2356     megabytes), thus penalizing straightforward matches. It is now done only if the
2357     amount of subject to be scanned is less than 1000 bytes.
2359     7. A lesser problem with the same optimization is that it was recording the
2360     first character of an anchored pattern as "needed", thus provoking a search
2361     right along the subject, even when the first match of the pattern was going to
2362     fail. The "needed" character is now not set for anchored patterns, unless it
2363     follows something in the pattern that is of non-fixed length. Thus, it still
2364     fulfils its original purpose of finding quick non-matches in cases of nested
2365     unlimited repeats, but isn't used for simple anchored patterns such as /^abc/.
2368     Version 4.0 17-Feb-03
2369     ---------------------
2371 nigel 63 1. If a comment in an extended regex that started immediately after a meta-item
2372     extended to the end of string, PCRE compiled incorrect data. This could lead to
2373     all kinds of weird effects. Example: /#/ was bad; /()#/ was bad; /a#/ was not.
2375     2. Moved to autoconf 2.53 and libtool 1.4.2.
2377     3. Perl 5.8 no longer needs "use utf8" for doing UTF-8 things. Consequently,
2378     the special perltest8 script is no longer needed - all the tests can be run
2379     from a single perltest script.
2381     4. From 5.004, Perl has not included the VT character (0x0b) in the set defined
2382     by \s. It has now been removed in PCRE. This means it isn't recognized as
2383     whitespace in /x regexes too, which is the same as Perl. Note that the POSIX
2384     class [:space:] *does* include VT, thereby creating a mess.
2386     5. Added the class [:blank:] (a GNU extension from Perl 5.8) to match only
2387     space and tab.
2389     6. Perl 5.005 was a long time ago. It's time to amalgamate the tests that use
2390     its new features into the main test script, reducing the number of scripts.
2392     7. Perl 5.8 has changed the meaning of patterns like /a(?i)b/. Earlier versions
2393     were backward compatible, and made the (?i) apply to the whole pattern, as if
2394     /i were given. Now it behaves more logically, and applies the option setting
2395     only to what follows. PCRE has been changed to follow suit. However, if it
2396     finds options settings right at the start of the pattern, it extracts them into
2397     the global options, as before. Thus, they show up in the info data.
2399     8. Added support for the \Q...\E escape sequence. Characters in between are
2400     treated as literals. This is slightly different from Perl in that $ and @ are
2401     also handled as literals inside the quotes. In Perl, they will cause variable
2402     interpolation. Note the following examples:
2404     Pattern PCRE matches Perl matches
2406     \Qabc$xyz\E abc$xyz abc followed by the contents of $xyz
2407     \Qabc\$xyz\E abc\$xyz abc\$xyz
2408     \Qabc\E\$\Qxyz\E abc$xyz abc$xyz
2410     For compatibility with Perl, \Q...\E sequences are recognized inside character
2411     classes as well as outside them.
2413     9. Re-organized 3 code statements in pcretest to avoid "overflow in
2414     floating-point constant arithmetic" warnings from a Microsoft compiler. Added a
2415     (size_t) cast to one statement in pcretest and one in pcreposix to avoid
2416     signed/unsigned warnings.
2418     10. SunOS4 doesn't have strtoul(). This was used only for unpicking the -o
2419     option for pcretest, so I've replaced it by a simple function that does just
2420     that job.
2422     11. pcregrep was ending with code 0 instead of 2 for the commands "pcregrep" or
2423     "pcregrep -".
2425     12. Added "possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's
2426     Java package. This provides some syntactic sugar for simple cases of what my
2427     documentation calls "once-only subpatterns". A pattern such as x*+ is the same
2428     as (?>x*). In other words, if what is inside (?>...) is just a single repeated
2429     item, you can use this simplified notation. Note that only makes sense with
2430     greedy quantifiers. Consequently, the use of the possessive quantifier forces
2431     greediness, whatever the setting of the PCRE_UNGREEDY option.
2433     13. A change of greediness default within a pattern was not taking effect at
2434     the current level for patterns like /(b+(?U)a+)/. It did apply to parenthesized
2435     subpatterns that followed. Patterns like /b+(?U)a+/ worked because the option
2436     was abstracted outside.
2438     14. PCRE now supports the \G assertion. It is true when the current matching
2439     position is at the start point of the match. This differs from \A when the
2440     starting offset is non-zero. Used with the /g option of pcretest (or similar
2441     code), it works in the same way as it does for Perl's /g option. If all
2442     alternatives of a regex begin with \G, the expression is anchored to the start
2443     match position, and the "anchored" flag is set in the compiled expression.
2445     15. Some bugs concerning the handling of certain option changes within patterns
2446     have been fixed. These applied to options other than (?ims). For example,
2447     "a(?x: b c )d" did not match "XabcdY" but did match "Xa b c dY". It should have
2448     been the other way round. Some of this was related to change 7 above.
2450     16. PCRE now gives errors for /[.x.]/ and /[=x=]/ as unsupported POSIX
2451     features, as Perl does. Previously, PCRE gave the warnings only for /[[.x.]]/
2452     and /[[=x=]]/. PCRE now also gives an error for /[:name:]/ because it supports
2453     POSIX classes only within a class (e.g. /[[:alpha:]]/).
2455     17. Added support for Perl's \C escape. This matches one byte, even in UTF8
2456     mode. Unlike ".", it always matches newline, whatever the setting of
2457     PCRE_DOTALL. However, PCRE does not permit \C to appear in lookbehind
2458     assertions. Perl allows it, but it doesn't (in general) work because it can't
2459     calculate the length of the lookbehind. At least, that's the case for Perl
2460     5.8.0 - I've been told they are going to document that it doesn't work in
2461     future.
2463     18. Added an error diagnosis for escapes that PCRE does not support: these are
2464     \L, \l, \N, \P, \p, \U, \u, and \X.
2466     19. Although correctly diagnosing a missing ']' in a character class, PCRE was
2467     reading past the end of the pattern in cases such as /[abcd/.
2469     20. PCRE was getting more memory than necessary for patterns with classes that
2470     contained both POSIX named classes and other characters, e.g. /[[:space:]abc/.
2472     21. Added some code, conditional on #ifdef VPCOMPAT, to make life easier for
2473     compiling PCRE for use with Virtual Pascal.
2475     22. Small fix to the Makefile to make it work properly if the build is done
2476     outside the source tree.
2478     23. Added a new extension: a condition to go with recursion. If a conditional
2479     subpattern starts with (?(R) the "true" branch is used if recursion has
2480     happened, whereas the "false" branch is used only at the top level.
2482     24. When there was a very long string of literal characters (over 255 bytes
2483     without UTF support, over 250 bytes with UTF support), the computation of how
2484     much memory was required could be incorrect, leading to segfaults or other
2485     strange effects.
2487     25. PCRE was incorrectly assuming anchoring (either to start of subject or to
2488     start of line for a non-DOTALL pattern) when a pattern started with (.*) and
2489     there was a subsequent back reference to those brackets. This meant that, for
2490     example, /(.*)\d+\1/ failed to match "abc123bc". Unfortunately, it isn't
2491     possible to check for precisely this case. All we can do is abandon the
2492     optimization if .* occurs inside capturing brackets when there are any back
2493     references whatsoever. (See below for a better fix that came later.)
2495     26. The handling of the optimization for finding the first character of a
2496     non-anchored pattern, and for finding a character that is required later in the
2497     match were failing in some cases. This didn't break the matching; it just
2498     failed to optimize when it could. The way this is done has been re-implemented.
2500     27. Fixed typo in error message for invalid (?R item (it said "(?p").
2502     28. Added a new feature that provides some of the functionality that Perl
2503     provides with (?{...}). The facility is termed a "callout". The way it is done
2504     in PCRE is for the caller to provide an optional function, by setting
2505     pcre_callout to its entry point. Like pcre_malloc and pcre_free, this is a
2506     global variable. By default it is unset, which disables all calling out. To get
2507     the function called, the regex must include (?C) at appropriate points. This
2508     is, in fact, equivalent to (?C0), and any number <= 255 may be given with (?C).
2509     This provides a means of identifying different callout points. When PCRE
2510     reaches such a point in the regex, if pcre_callout has been set, the external
2511     function is called. It is provided with data in a structure called
2512     pcre_callout_block, which is defined in pcre.h. If the function returns 0,
2513     matching continues; if it returns a non-zero value, the match at the current
2514     point fails. However, backtracking will occur if possible. [This was changed
2515     later and other features added - see item 49 below.]
2517     29. pcretest is upgraded to test the callout functionality. It provides a
2518     callout function that displays information. By default, it shows the start of
2519     the match and the current position in the text. There are some new data escapes
2520     to vary what happens:
2522     \C+ in addition, show current contents of captured substrings
2523     \C- do not supply a callout function
2524     \C!n return 1 when callout number n is reached
2525     \C!n!m return 1 when callout number n is reached for the mth time
2527     30. If pcregrep was called with the -l option and just a single file name, it
2528     output "<stdin>" if a match was found, instead of the file name.
2530     31. Improve the efficiency of the POSIX API to PCRE. If the number of capturing
2531     slots is less than POSIX_MALLOC_THRESHOLD, use a block on the stack to pass to
2532     pcre_exec(). This saves a malloc/free per call. The default value of
2533     POSIX_MALLOC_THRESHOLD is 10; it can be changed by --with-posix-malloc-threshold
2534     when configuring.
2536     32. The default maximum size of a compiled pattern is 64K. There have been a
2537     few cases of people hitting this limit. The code now uses macros to handle the
2538     storing of links as offsets within the compiled pattern. It defaults to 2-byte
2539     links, but this can be changed to 3 or 4 bytes by --with-link-size when
2540     configuring. Tests 2 and 5 work only with 2-byte links because they output
2541     debugging information about compiled patterns.
2543     33. Internal code re-arrangements:
2545     (a) Moved the debugging function for printing out a compiled regex into
2546     its own source file (printint.c) and used #include to pull it into
2547     pcretest.c and, when DEBUG is defined, into pcre.c, instead of having two
2548     separate copies.
2550     (b) Defined the list of op-code names for debugging as a macro in
2551     internal.h so that it is next to the definition of the opcodes.
2553     (c) Defined a table of op-code lengths for simpler skipping along compiled
2554     code. This is again a macro in internal.h so that it is next to the
2555     definition of the opcodes.
2557     34. Added support for recursive calls to individual subpatterns, along the
2558     lines of Robin Houston's patch (but implemented somewhat differently).
2560     35. Further mods to the Makefile to help Win32. Also, added code to pcregrep to
2561     allow it to read and process whole directories in Win32. This code was
2562     contributed by Lionel Fourquaux; it has not been tested by me.
2564     36. Added support for named subpatterns. The Python syntax (?P<name>...) is
2565     used to name a group. Names consist of alphanumerics and underscores, and must
2566     be unique. Back references use the syntax (?P=name) and recursive calls use
2567     (?P>name) which is a PCRE extension to the Python extension. Groups still have
2568     numbers. The function pcre_fullinfo() can be used after compilation to extract
2569     a name/number map. There are three relevant calls:
2571     PCRE_INFO_NAMEENTRYSIZE yields the size of each entry in the map
2572     PCRE_INFO_NAMECOUNT yields the number of entries
2573     PCRE_INFO_NAMETABLE yields a pointer to the map.
2575     The map is a vector of fixed-size entries. The size of each entry depends on
2576     the length of the longest name used. The first two bytes of each entry are the
2577     group number, most significant byte first. There follows the corresponding
2578     name, zero terminated. The names are in alphabetical order.
2580     37. Make the maximum literal string in the compiled code 250 for the non-UTF-8
2581     case instead of 255. Making it the same both with and without UTF-8 support
2582     means that the same test output works with both.
2584     38. There was a case of malloc(0) in the POSIX testing code in pcretest. Avoid
2585     calling malloc() with a zero argument.
2587     39. Change 25 above had to resort to a heavy-handed test for the .* anchoring
2588     optimization. I've improved things by keeping a bitmap of backreferences with
2589     numbers 1-31 so that if .* occurs inside capturing brackets that are not in
2590     fact referenced, the optimization can be applied. It is unlikely that a
2591     relevant occurrence of .* (i.e. one which might indicate anchoring or forcing
2592     the match to follow \n) will appear inside brackets with a number greater than
2593     31, but if it does, any back reference > 31 suppresses the optimization.
2595     40. Added a new compile-time option PCRE_NO_AUTO_CAPTURE. This has the effect
2596     of disabling numbered capturing parentheses. Any opening parenthesis that is
2597     not followed by ? behaves as if it were followed by ?: but named parentheses
2598     can still be used for capturing (and they will acquire numbers in the usual
2599     way).
2601     41. Redesigned the return codes from the match() function into yes/no/error so
2602     that errors can be passed back from deep inside the nested calls. A malloc
2603     failure while inside a recursive subpattern call now causes the
2604     PCRE_ERROR_NOMEMORY return instead of quietly going wrong.
2606     42. It is now possible to set a limit on the number of times the match()
2607     function is called in a call to pcre_exec(). This facility makes it possible to
2608     limit the amount of recursion and backtracking, though not in a directly
2609     obvious way, because the match() function is used in a number of different
2610     circumstances. The count starts from zero for each position in the subject
2611     string (for non-anchored patterns). The default limit is, for compatibility, a
2612     large number, namely 10 000 000. You can change this in two ways:
2614     (a) When configuring PCRE before making, you can use --with-match-limit=n
2615     to set a default value for the compiled library.
2617     (b) For each call to pcre_exec(), you can pass a pcre_extra block in which
2618     a different value is set. See 45 below.
2620     If the limit is exceeded, pcre_exec() returns PCRE_ERROR_MATCHLIMIT.
2622     43. Added a new function pcre_config(int, void *) to enable run-time extraction
2623     of things that can be changed at compile time. The first argument specifies
2624     what is wanted and the second points to where the information is to be placed.
2625     The current list of available information is:
2629     The output is an integer that is set to one if UTF-8 support is available;
2630     otherwise it is set to zero.
2634     The output is an integer that it set to the value of the code that is used for
2635     newline. It is either LF (10) or CR (13).
2639     The output is an integer that contains the number of bytes used for internal
2640     linkage in compiled expressions. The value is 2, 3, or 4. See item 32 above.
2644     The output is an integer that contains the threshold above which the POSIX
2645     interface uses malloc() for output vectors. See item 31 above.
2649     The output is an unsigned integer that contains the default limit of the number
2650     of match() calls in a pcre_exec() execution. See 42 above.
2652     44. pcretest has been upgraded by the addition of the -C option. This causes it
2653     to extract all the available output from the new pcre_config() function, and to
2654     output it. The program then exits immediately.
2656     45. A need has arisen to pass over additional data with calls to pcre_exec() in
2657     order to support additional features. One way would have been to define
2658     pcre_exec2() (for example) with extra arguments, but this would not have been
2659     extensible, and would also have required all calls to the original function to
2660     be mapped to the new one. Instead, I have chosen to extend the mechanism that
2661     is used for passing in "extra" data from pcre_study().
2663     The pcre_extra structure is now exposed and defined in pcre.h. It currently
2664     contains the following fields:
2666     flags a bitmap indicating which of the following fields are set
2667     study_data opaque data from pcre_study()
2668     match_limit a way of specifying a limit on match() calls for a specific
2669     call to pcre_exec()
2670     callout_data data for callouts (see 49 below)
2672     The flag bits are also defined in pcre.h, and are
2678     The pcre_study() function now returns one of these new pcre_extra blocks, with
2679     the actual study data pointed to by the study_data field, and the
2680     PCRE_EXTRA_STUDY_DATA flag set. This can be passed directly to pcre_exec() as
2681     before. That is, this change is entirely upwards-compatible and requires no
2682     change to existing code.
2684     If you want to pass in additional data to pcre_exec(), you can either place it
2685     in a pcre_extra block provided by pcre_study(), or create your own pcre_extra
2686     block.
2688     46. pcretest has been extended to test the PCRE_EXTRA_MATCH_LIMIT feature. If a
2689     data string contains the escape sequence \M, pcretest calls pcre_exec() several
2690     times with different match limits, until it finds the minimum value needed for
2691     pcre_exec() to complete. The value is then output. This can be instructive; for
2692     most simple matches the number is quite small, but for pathological cases it
2693     gets very large very quickly.
2695     47. There's a new option for pcre_fullinfo() called PCRE_INFO_STUDYSIZE. It
2696     returns the size of the data block pointed to by the study_data field in a
2697     pcre_extra block, that is, the value that was passed as the argument to
2698     pcre_malloc() when PCRE was getting memory in which to place the information
2699     created by pcre_study(). The fourth argument should point to a size_t variable.
2700     pcretest has been extended so that this information is shown after a successful
2701     pcre_study() call when information about the compiled regex is being displayed.
2703     48. Cosmetic change to Makefile: there's no need to have / after $(DESTDIR)
2704     because what follows is always an absolute path. (Later: it turns out that this
2705     is more than cosmetic for MinGW, because it doesn't like empty path
2706     components.)
2708     49. Some changes have been made to the callout feature (see 28 above):
2710     (i) A callout function now has three choices for what it returns:
2712     0 => success, carry on matching
2713     > 0 => failure at this point, but backtrack if possible
2714     < 0 => serious error, return this value from pcre_exec()
2716     Negative values should normally be chosen from the set of PCRE_ERROR_xxx
2717     values. In particular, returning PCRE_ERROR_NOMATCH forces a standard
2718     "match failed" error. The error number PCRE_ERROR_CALLOUT is reserved for
2719     use by callout functions. It will never be used by PCRE itself.
2721     (ii) The pcre_extra structure (see 45 above) has a void * field called
2722     callout_data, with corresponding flag bit PCRE_EXTRA_CALLOUT_DATA. The
2723     pcre_callout_block structure has a field of the same name. The contents of
2724     the field passed in the pcre_extra structure are passed to the callout
2725     function in the corresponding field in the callout block. This makes it
2726     easier to use the same callout-containing regex from multiple threads. For
2727     testing, the pcretest program has a new data escape
2729     \C*n pass the number n (may be negative) as callout_data
2731     If the callout function in pcretest receives a non-zero value as
2732     callout_data, it returns that value.
2734     50. Makefile wasn't handling CFLAGS properly when compiling dftables. Also,
2735     there were some redundant $(CFLAGS) in commands that are now specified as
2736     $(LINK), which already includes $(CFLAGS).
2738     51. Extensions to UTF-8 support are listed below. These all apply when (a) PCRE
2739     has been compiled with UTF-8 support *and* pcre_compile() has been compiled
2740     with the PCRE_UTF8 flag. Patterns that are compiled without that flag assume
2741     one-byte characters throughout. Note that case-insensitive matching applies
2742     only to characters whose values are less than 256. PCRE doesn't support the
2743     notion of cases for higher-valued characters.
2745     (i) A character class whose characters are all within 0-255 is handled as
2746     a bit map, and the map is inverted for negative classes. Previously, a
2747     character > 255 always failed to match such a class; however it should
2748     match if the class was a negative one (e.g. [^ab]). This has been fixed.
2750     (ii) A negated character class with a single character < 255 is coded as
2751     "not this character" (OP_NOT). This wasn't working properly when the test
2752     character was multibyte, either singly or repeated.
2754     (iii) Repeats of multibyte characters are now handled correctly in UTF-8
2755     mode, for example: \x{100}{2,3}.
2757     (iv) The character escapes \b, \B, \d, \D, \s, \S, \w, and \W (either
2758     singly or repeated) now correctly test multibyte characters. However,
2759     PCRE doesn't recognize any characters with values greater than 255 as
2760     digits, spaces, or word characters. Such characters always match \D, \S,
2761     and \W, and never match \d, \s, or \w.
2763     (v) Classes may now contain characters and character ranges with values
2764     greater than 255. For example: [ab\x{100}-\x{400}].
2766     (vi) pcregrep now has a --utf-8 option (synonym -u) which makes it call
2767     PCRE in UTF-8 mode.
2769     52. The info request value PCRE_INFO_FIRSTCHAR has been renamed
2770     PCRE_INFO_FIRSTBYTE because it is a byte value. However, the old name is
2771     retained for backwards compatibility. (Note that LASTLITERAL is also a byte
2772     value.)
2774     53. The single man page has become too large. I have therefore split it up into
2775     a number of separate man pages. These also give rise to individual HTML pages;
2776     these are now put in a separate directory, and there is an index.html page that
2777     lists them all. Some hyperlinking between the pages has been installed.
2779     54. Added convenience functions for handling named capturing parentheses.
2781     55. Unknown escapes inside character classes (e.g. [\M]) and escapes that
2782     aren't interpreted therein (e.g. [\C]) are literals in Perl. This is now also
2783     true in PCRE, except when the PCRE_EXTENDED option is set, in which case they
2784     are faulted.
2786     56. Introduced HOST_CC and HOST_CFLAGS which can be set in the environment when
2787     calling configure. These values are used when compiling the dftables.c program
2788     which is run to generate the source of the default character tables. They
2789     default to the values of CC and CFLAGS. If you are cross-compiling PCRE,
2790     you will need to set these values.
2792     57. Updated the building process for Windows DLL, as provided by Fred Cox.
2795     Version 3.9 02-Jan-02
2796 nigel 61 ---------------------
2798     1. A bit of extraneous text had somehow crept into the pcregrep documentation.
2800     2. If --disable-static was given, the building process failed when trying to
2801     build pcretest and pcregrep. (For some reason it was using libtool to compile
2802     them, which is not right, as they aren't part of the library.)
2805 nigel 59 Version 3.8 18-Dec-01
2806     ---------------------
2808     1. The experimental UTF-8 code was completely screwed up. It was packing the
2809     bytes in the wrong order. How dumb can you get?
2812 nigel 57 Version 3.7 29-Oct-01
2813     ---------------------
2815     1. In updating pcretest to check change 1 of version 3.6, I screwed up.
2816     This caused pcretest, when used on the test data, to segfault. Unfortunately,
2817     this didn't happen under Solaris 8, where I normally test things.
2819 nigel 59 2. The Makefile had to be changed to make it work on BSD systems, where 'make'
2820     doesn't seem to recognize that ./xxx and xxx are the same file. (This entry
2821     isn't in ChangeLog distributed with 3.7 because I forgot when I hastily made
2822     this fix an hour or so after the initial 3.7 release.)
2823 nigel 57
2824 nigel 59
2825 nigel 55 Version 3.6 23-Oct-01
2826     ---------------------
2828     1. Crashed with /(sens|respons)e and \1ibility/ and "sense and sensibility" if
2829     offsets passed as NULL with zero offset count.
2831     2. The config.guess and config.sub files had not been updated when I moved to
2832     the latest autoconf.
2835 nigel 53 Version 3.5 15-Aug-01
2836     ---------------------
2837 nigel 5
2838 nigel 53 1. Added some missing #if !defined NOPOSIX conditionals in pcretest.c that
2839     had been forgotten.
2841     2. By using declared but undefined structures, we can avoid using "void"
2842     definitions in pcre.h while keeping the internal definitions of the structures
2843     private.
2845     3. The distribution is now built using autoconf 2.50 and libtool 1.4. From a
2846     user point of view, this means that both static and shared libraries are built
2847     by default, but this can be individually controlled. More of the work of
2848     handling this static/shared cases is now inside libtool instead of PCRE's make
2849     file.
2851     4. The pcretest utility is now installed along with pcregrep because it is
2852     useful for users (to test regexs) and by doing this, it automatically gets
2853     relinked by libtool. The documentation has been turned into a man page, so
2854     there are now .1, .txt, and .html versions in /doc.
2856     5. Upgrades to pcregrep:
2857     (i) Added long-form option names like gnu grep.
2858     (ii) Added --help to list all options with an explanatory phrase.
2859     (iii) Added -r, --recursive to recurse into sub-directories.
2860     (iv) Added -f, --file to read patterns from a file.
2862     6. pcre_exec() was referring to its "code" argument before testing that
2863     argument for NULL (and giving an error if it was NULL).
2865     7. Upgraded Makefile.in to allow for compiling in a different directory from
2866     the source directory.
2868     8. Tiny buglet in pcretest: when pcre_fullinfo() was called to retrieve the
2869     options bits, the pointer it was passed was to an int instead of to an unsigned
2870     long int. This mattered only on 64-bit systems.
2872     9. Fixed typo (3.4/1) in pcre.h again. Sigh. I had changed pcre.h (which is
2873     generated) instead of pcre.in, which it its source. Also made the same change
2874     in several of the .c files.
2876     10. A new release of gcc defines printf() as a macro, which broke pcretest
2877     because it had an ifdef in the middle of a string argument for printf(). Fixed
2878     by using separate calls to printf().
2880     11. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
2881     script, to force use of CR or LF instead of \n in the source. On non-Unix
2882     systems, the value can be set in config.h.
2884     12. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
2885     absolute limit. Changed the text of the error message to make this clear, and
2886     likewise updated the man page.
2888     13. The limit of 99 on the number of capturing subpatterns has been removed.
2889     The new limit is 65535, which I hope will not be a "real" limit.
2892 nigel 51 Version 3.4 22-Aug-00
2893     ---------------------
2895     1. Fixed typo in pcre.h: unsigned const char * changed to const unsigned char *.
2897     2. Diagnose condition (?(0) as an error instead of crashing on matching.
2900 nigel 49 Version 3.3 01-Aug-00
2901     ---------------------
2903     1. If an octal character was given, but the value was greater than \377, it
2904     was not getting masked to the least significant bits, as documented. This could
2905     lead to crashes in some systems.
2907     2. Perl 5.6 (if not earlier versions) accepts classes like [a-\d] and treats
2908     the hyphen as a literal. PCRE used to give an error; it now behaves like Perl.
2910     3. Added the functions pcre_free_substring() and pcre_free_substring_list().
2911     These just pass their arguments on to (pcre_free)(), but they are provided
2912     because some uses of PCRE bind it to non-C systems that can call its functions,
2913     but cannot call free() or pcre_free() directly.
2915     4. Add "make test" as a synonym for "make check". Corrected some comments in
2916     the Makefile.
2918     5. Add $(DESTDIR)/ in front of all the paths in the "install" target in the
2919     Makefile.
2921     6. Changed the name of pgrep to pcregrep, because Solaris has introduced a
2922     command called pgrep for grepping around the active processes.
2924     7. Added the beginnings of support for UTF-8 character strings.
2926     8. Arranged for the Makefile to pass over the settings of CC, CFLAGS, and
2927     RANLIB to ./ltconfig so that they are used by libtool. I think these are all
2928     the relevant ones. (AR is not passed because ./ltconfig does its own figuring
2929     out for the ar command.)
2932 nigel 47 Version 3.2 12-May-00
2933     ---------------------
2935     This is purely a bug fixing release.
2937     1. If the pattern /((Z)+|A)*/ was matched agained ZABCDEFG it matched Z instead
2938     of ZA. This was just one example of several cases that could provoke this bug,
2939     which was introduced by change 9 of version 2.00. The code for breaking
2940     infinite loops after an iteration that matches an empty string was't working
2941     correctly.
2943     2. The pcretest program was not imitating Perl correctly for the pattern /a*/g
2944     when matched against abbab (for example). After matching an empty string, it
2945     wasn't forcing anchoring when setting PCRE_NOTEMPTY for the next attempt; this
2946     caused it to match further down the string than it should.
2948     3. The code contained an inclusion of sys/types.h. It isn't clear why this
2949     was there because it doesn't seem to be needed, and it causes trouble on some
2950     systems, as it is not a Standard C header. It has been removed.
2952     4. Made 4 silly changes to the source to avoid stupid compiler warnings that
2953     were reported on the Macintosh. The changes were from
2955     while ((c = *(++ptr)) != 0 && c != '\n');
2956     to
2957     while ((c = *(++ptr)) != 0 && c != '\n') ;
2959     Totally extraordinary, but if that's what it takes...
2961     5. PCRE is being used in one environment where neither memmove() nor bcopy() is
2962     available. Added HAVE_BCOPY and an autoconf test for it; if neither
2963     HAVE_MEMMOVE nor HAVE_BCOPY is set, use a built-in emulation function which
2964     assumes the way PCRE uses memmove() (always moving upwards).
2966     6. PCRE is being used in one environment where strchr() is not available. There
2967     was only one use in pcre.c, and writing it out to avoid strchr() probably gives
2968     faster code anyway.
2971 nigel 45 Version 3.1 09-Feb-00
2972     ---------------------
2974     The only change in this release is the fixing of some bugs in Makefile.in for
2975     the "install" target:
2977     (1) It was failing to install pcreposix.h.
2979     (2) It was overwriting the pcre.3 man page with the pcreposix.3 man page.
2982 nigel 43 Version 3.0 01-Feb-00
2983     ---------------------
2984 nigel 41
2985     1. Add support for the /+ modifier to perltest (to output $` like it does in
2986     pcretest).
2988     2. Add support for the /g modifier to perltest.
2990     3. Fix pcretest so that it behaves even more like Perl for /g when the pattern
2991     matches null strings.
2993     4. Fix perltest so that it doesn't do unwanted things when fed an empty
2994     pattern. Perl treats empty patterns specially - it reuses the most recent
2995     pattern, which is not what we want. Replace // by /(?#)/ in order to avoid this
2996     effect.
2998     5. The POSIX interface was broken in that it was just handing over the POSIX
2999     captured string vector to pcre_exec(), but (since release 2.00) PCRE has
3000     required a bigger vector, with some working space on the end. This means that
3001     the POSIX wrapper now has to get and free some memory, and copy the results.
3003 nigel 43 6. Added some simple autoconf support, placing the test data and the
3004     documentation in separate directories, re-organizing some of the
3005     information files, and making it build pcre-config (a GNU standard). Also added
3006     libtool support for building PCRE as a shared library, which is now the
3007     default.
3008 nigel 41
3009 nigel 43 7. Got rid of the leading zero in the definition of PCRE_MINOR because 08 and
3010     09 are not valid octal constants. Single digits will be used for minor values
3011     less than 10.
3013     8. Defined REG_EXTENDED and REG_NOSUB as zero in the POSIX header, so that
3014     existing programs that set these in the POSIX interface can use PCRE without
3015     modification.
3017     9. Added a new function, pcre_fullinfo() with an extensible interface. It can
3018     return all that pcre_info() returns, plus additional data. The pcre_info()
3019     function is retained for compatibility, but is considered to be obsolete.
3021     10. Added experimental recursion feature (?R) to handle one common case that
3022     Perl 5.6 will be able to do with (?p{...}).
3024     11. Added support for POSIX character classes like [:alpha:], which Perl is
3025     adopting.
3028 nigel 39 Version 2.08 31-Aug-99
3029     ----------------------
3031     1. When startoffset was not zero and the pattern began with ".*", PCRE was not
3032     trying to match at the startoffset position, but instead was moving forward to
3033     the next newline as if a previous match had failed.
3035     2. pcretest was not making use of PCRE_NOTEMPTY when repeating for /g and /G,
3036     and could get into a loop if a null string was matched other than at the start
3037     of the subject.
3039     3. Added definitions of PCRE_MAJOR and PCRE_MINOR to pcre.h so the version can
3040     be distinguished at compile time, and for completeness also added PCRE_DATE.
3042     5. Added Paul Sokolovsky's minor changes to make it easy to compile a Win32 DLL
3043     in GnuWin32 environments.
3046 nigel 37 Version 2.07 29-Jul-99
3047     ----------------------
3049     1. The documentation is now supplied in plain text form and HTML as well as in
3050     the form of man page sources.
3052     2. C++ compilers don't like assigning (void *) values to other pointer types.
3053     In particular this affects malloc(). Although there is no problem in Standard
3054     C, I've put in casts to keep C++ compilers happy.
3056     3. Typo on pcretest.c; a cast of (unsigned char *) in the POSIX regexec() call
3057     should be (const char *).
3059     4. If NOPOSIX is defined, pcretest.c compiles without POSIX support. This may
3060     be useful for non-Unix systems who don't want to bother with the POSIX stuff.
3061     However, I haven't made this a standard facility. The documentation doesn't
3062     mention it, and the Makefile doesn't support it.
3064     5. The Makefile now contains an "install" target, with editable destinations at
3065     the top of the file. The pcretest program is not installed.
3067     6. pgrep -V now gives the PCRE version number and date.
3069     7. Fixed bug: a zero repetition after a literal string (e.g. /abcde{0}/) was
3070     causing the entire string to be ignored, instead of just the last character.
3072     8. If a pattern like /"([^\\"]+|\\.)*"/ is applied in the normal way to a
3073     non-matching string, it can take a very, very long time, even for strings of
3074     quite modest length, because of the nested recursion. PCRE now does better in
3075     some of these cases. It does this by remembering the last required literal
3076     character in the pattern, and pre-searching the subject to ensure it is present
3077     before running the real match. In other words, it applies a heuristic to detect
3078     some types of certain failure quickly, and in the above example, if presented
3079     with a string that has no trailing " it gives "no match" very quickly.
3081     9. A new runtime option PCRE_NOTEMPTY causes null string matches to be ignored;
3082     other alternatives are tried instead.
3085 nigel 35 Version 2.06 09-Jun-99
3086     ----------------------
3088     1. Change pcretest's output for amount of store used to show just the code
3089     space, because the remainder (the data block) varies in size between 32-bit and
3090     64-bit systems.
3092     2. Added an extra argument to pcre_exec() to supply an offset in the subject to
3093     start matching at. This allows lookbehinds to work when searching for multiple
3094     occurrences in a string.
3096     3. Added additional options to pcretest for testing multiple occurrences:
3098     /+ outputs the rest of the string that follows a match
3099     /g loops for multiple occurrences, using the new startoffset argument
3100     /G loops for multiple occurrences by passing an incremented pointer
3102     4. PCRE wasn't doing the "first character" optimization for patterns starting
3103     with \b or \B, though it was doing it for other lookbehind assertions. That is,
3104     it wasn't noticing that a match for a pattern such as /\bxyz/ has to start with
3105     the letter 'x'. On long subject strings, this gives a significant speed-up.
3108 nigel 33 Version 2.05 21-Apr-99
3109     ----------------------
3111     1. Changed the type of magic_number from int to long int so that it works
3112     properly on 16-bit systems.
3114     2. Fixed a bug which caused patterns starting with .* not to work correctly
3115     when the subject string contained newline characters. PCRE was assuming
3116     anchoring for such patterns in all cases, which is not correct because .* will
3117     not pass a newline unless PCRE_DOTALL is set. It now assumes anchoring only if
3118     DOTALL is set at top level; otherwise it knows that patterns starting with .*
3119     must be retried after every newline in the subject.
3122 nigel 31 Version 2.04 18-Feb-99
3123     ----------------------
3125     1. For parenthesized subpatterns with repeats whose minimum was zero, the
3126     computation of the store needed to hold the pattern was incorrect (too large).
3127     If such patterns were nested a few deep, this could multiply and become a real
3128     problem.
3130     2. Added /M option to pcretest to show the memory requirement of a specific
3131     pattern. Made -m a synonym of -s (which does this globally) for compatibility.
3133     3. Subpatterns of the form (regex){n,m} (i.e. limited maximum) were being
3134     compiled in such a way that the backtracking after subsequent failure was
3135     pessimal. Something like (a){0,3} was compiled as (a)?(a)?(a)? instead of
3136     ((a)((a)(a)?)?)? with disastrous performance if the maximum was of any size.
3139 nigel 29 Version 2.03 02-Feb-99
3140     ----------------------
3142     1. Fixed typo and small mistake in man page.
3144 nigel 31 2. Added 4th condition (GPL supersedes if conflict) and created separate
3145     LICENCE file containing the conditions.
3146 nigel 29
3147     3. Updated pcretest so that patterns such as /abc\/def/ work like they do in
3148     Perl, that is the internal \ allows the delimiter to be included in the
3149     pattern. Locked out the use of \ as a delimiter. If \ immediately follows
3150     the final delimiter, add \ to the end of the pattern (to test the error).
3152     4. Added the convenience functions for extracting substrings after a successful
3153     match. Updated pcretest to make it able to test these functions.
3156 nigel 27 Version 2.02 14-Jan-99
3157     ----------------------
3159     1. Initialized the working variables associated with each extraction so that
3160     their saving and restoring doesn't refer to uninitialized store.
3162     2. Put dummy code into study.c in order to trick the optimizer of the IBM C
3163     compiler for OS/2 into generating correct code. Apparently IBM isn't going to
3164     fix the problem.
3166     3. Pcretest: the timing code wasn't using LOOPREPEAT for timing execution
3167     calls, and wasn't printing the correct value for compiling calls. Increased the
3168     default value of LOOPREPEAT, and the number of significant figures in the
3169     times.
3171     4. Changed "/bin/rm" in the Makefile to "-rm" so it works on Windows NT.
3173     5. Renamed "deftables" as "dftables" to get it down to 8 characters, to avoid
3174     a building problem on Windows NT with a FAT file system.
3177 nigel 25 Version 2.01 21-Oct-98
3178     ----------------------
3180     1. Changed the API for pcre_compile() to allow for the provision of a pointer
3181     to character tables built by pcre_maketables() in the current locale. If NULL
3182     is passed, the default tables are used.
3185 nigel 23 Version 2.00 24-Sep-98
3186 nigel 21 ----------------------
3188 nigel 23 1. Since the (>?) facility is in Perl 5.005, don't require PCRE_EXTRA to enable
3189     it any more.
3191     2. Allow quantification of (?>) groups, and make it work correctly.
3193     3. The first character computation wasn't working for (?>) groups.
3195     4. Correct the implementation of \Z (it is permitted to match on the \n at the
3196     end of the subject) and add 5.005's \z, which really does match only at the
3197     very end of the subject.
3199     5. Remove the \X "cut" facility; Perl doesn't have it, and (?> is neater.
3201     6. Remove the ability to specify CASELESS, MULTILINE, DOTALL, and
3202     DOLLAR_END_ONLY at runtime, to make it possible to implement the Perl 5.005
3203     localized options. All options to pcre_study() were also removed.
3205     7. Add other new features from 5.005:
3207     $(?<= positive lookbehind
3208     $(?<! negative lookbehind
3209     (?imsx-imsx) added the unsetting capability
3210     such a setting is global if at outer level; local otherwise
3211     (?imsx-imsx:) non-capturing groups with option setting
3212     (?(cond)re|re) conditional pattern matching
3214     A backreference to itself in a repeated group matches the previous
3215     captured string.
3217     8. General tidying up of studying (both automatic and via "study")
3218     consequential on the addition of new assertions.
3220     9. As in 5.005, unlimited repeated groups that could match an empty substring
3221     are no longer faulted at compile time. Instead, the loop is forcibly broken at
3222     runtime if any iteration does actually match an empty substring.
3224     10. Include the RunTest script in the distribution.
3226     11. Added tests from the Perl 5.005_02 distribution. This showed up a few
3227     discrepancies, some of which were old and were also with respect to 5.004. They
3228     have now been fixed.
3231     Version 1.09 28-Apr-98
3232     ----------------------
3234 nigel 21 1. A negated single character class followed by a quantifier with a minimum
3235     value of one (e.g. [^x]{1,6} ) was not compiled correctly. This could lead to
3236     program crashes, or just wrong answers. This did not apply to negated classes
3237     containing more than one character, or to minima other than one.
3240 nigel 19 Version 1.08 27-Mar-98
3241     ----------------------
3243     1. Add PCRE_UNGREEDY to invert the greediness of quantifiers.
3245     2. Add (?U) and (?X) to set PCRE_UNGREEDY and PCRE_EXTRA respectively. The
3246     latter must appear before anything that relies on it in the pattern.
3249 nigel 17 Version 1.07 16-Feb-98
3250     ----------------------
3252     1. A pattern such as /((a)*)*/ was not being diagnosed as in error (unlimited
3253     repeat of a potentially empty string).
3256 nigel 15 Version 1.06 23-Jan-98
3257     ----------------------
3259     1. Added Markus Oberhumer's little patches for C++.
3261     2. Literal strings longer than 255 characters were broken.
3264 nigel 13 Version 1.05 23-Dec-97
3265     ----------------------
3267     1. Negated character classes containing more than one character were failing if
3268     PCRE_CASELESS was set at run time.
3271 nigel 11 Version 1.04 19-Dec-97
3272     ----------------------
3274     1. Corrected the man page, where some "const" qualifiers had been omitted.
3276     2. Made debugging output print "{0,xxx}" instead of just "{,xxx}" to agree with
3277     input syntax.
3279     3. Fixed memory leak which occurred when a regex with back references was
3280     matched with an offsets vector that wasn't big enough. The temporary memory
3281     that is used in this case wasn't being freed if the match failed.
3283     4. Tidied pcretest to ensure it frees memory that it gets.
3285     5. Temporary memory was being obtained in the case where the passed offsets
3286     vector was exactly big enough.
3288     6. Corrected definition of offsetof() from change 5 below.
3290     7. I had screwed up change 6 below and broken the rules for the use of
3291     setjmp(). Now fixed.
3294 nigel 9 Version 1.03 18-Dec-97
3295     ----------------------
3297     1. A erroneous regex with a missing opening parenthesis was correctly
3298     diagnosed, but PCRE attempted to access brastack[-1], which could cause crashes
3299     on some systems.
3301     2. Replaced offsetof(real_pcre, code) by offsetof(real_pcre, code[0]) because
3302     it was reported that one broken compiler failed on the former because "code" is
3303     also an independent variable.
3305     3. The erroneous regex a[]b caused an array overrun reference.
3307     4. A regex ending with a one-character negative class (e.g. /[^k]$/) did not
3308     fail on data ending with that character. (It was going on too far, and checking
3309     the next character, typically a binary zero.) This was specific to the
3310     optimized code for single-character negative classes.
3312     5. Added a contributed patch from the TIN world which does the following:
3314     + Add an undef for memmove, in case the the system defines a macro for it.
3316     + Add a definition of offsetof(), in case there isn't one. (I don't know
3317     the reason behind this - offsetof() is part of the ANSI standard - but
3318     it does no harm).
3320     + Reduce the ifdef's in pcre.c using macro DPRINTF, thereby eliminating
3321     most of the places where whitespace preceded '#'. I have given up and
3322     allowed the remaining 2 cases to be at the margin.
3324     + Rename some variables in pcre to eliminate shadowing. This seems very
3325     pedantic, but does no harm, of course.
3327     6. Moved the call to setjmp() into its own function, to get rid of warnings
3328     from gcc -Wall, and avoided calling it at all unless PCRE_EXTRA is used.
3330     7. Constructs such as \d{8,} were compiling into the equivalent of
3331 nigel 11 \d{8}\d{0,65527} instead of \d{8}\d* which didn't make much difference to the
3332 nigel 9 outcome, but in this particular case used more store than had been allocated,
3333     which caused the bug to be discovered because it threw up an internal error.
3335     8. The debugging code in both pcre and pcretest for outputting the compiled
3336     form of a regex was going wrong in the case of back references followed by
3337     curly-bracketed repeats.
3340 nigel 7 Version 1.02 12-Dec-97
3341     ----------------------
3343     1. Typos in pcre.3 and comments in the source fixed.
3345     2. Applied a contributed patch to get rid of places where it used to remove
3346     'const' from variables, and fixed some signed/unsigned and uninitialized
3347     variable warnings.
3349     3. Added the "runtest" target to Makefile.
3351     4. Set default compiler flag to -O2 rather than just -O.
3354 nigel 5 Version 1.01 19-Nov-97
3355     ----------------------
3357     1. PCRE was failing to diagnose unlimited repeat of empty string for patterns
3358     like /([ab]*)*/, that is, for classes with more than one character in them.
3360     2. Likewise, it wasn't diagnosing patterns with "once-only" subpatterns, such
3361     as /((?>a*))*/ (a PCRE_EXTRA facility).
3364     Version 1.00 18-Nov-97
3365     ----------------------
3367     1. Added compile-time macros to support systems such as SunOS4 which don't have
3368     memmove() or strerror() but have other things that can be used instead.
3370     2. Arranged that "make clean" removes the executables.
3373 nigel 3 Version 0.99 27-Oct-97
3374     ----------------------
3376     1. Fixed bug in code for optimizing classes with only one character. It was
3377     initializing a 32-byte map regardless, which could cause it to run off the end
3378     of the memory it had got.
3380     2. Added, conditional on PCRE_EXTRA, the proposed (?>REGEX) construction.
3383     Version 0.98 22-Oct-97
3384     ----------------------
3386     1. Fixed bug in code for handling temporary memory usage when there are more
3387     back references than supplied space in the ovector. This could cause segfaults.
3390     Version 0.97 21-Oct-97
3391     ----------------------
3393     1. Added the \X "cut" facility, conditional on PCRE_EXTRA.
3395     2. Optimized negated single characters not to use a bit map.
3397     3. Brought error texts together as macro definitions; clarified some of them;
3398     fixed one that was wrong - it said "range out of order" when it meant "invalid
3399     escape sequence".
3401     4. Changed some char * arguments to const char *.
3403     5. Added PCRE_NOTBOL and PCRE_NOTEOL (from POSIX).
3405     6. Added the POSIX-style API wrapper in pcreposix.a and testing facilities in
3406     pcretest.
3409     Version 0.96 16-Oct-97
3410     ----------------------
3412     1. Added a simple "pgrep" utility to the distribution.
3414     2. Fixed an incompatibility with Perl: "{" is now treated as a normal character
3415     unless it appears in one of the precise forms "{ddd}", "{ddd,}", or "{ddd,ddd}"
3416     where "ddd" means "one or more decimal digits".
3418     3. Fixed serious bug. If a pattern had a back reference, but the call to
3419     pcre_exec() didn't supply a large enough ovector to record the related
3420     identifying subpattern, the match always failed. PCRE now remembers the number
3421     of the largest back reference, and gets some temporary memory in which to save
3422     the offsets during matching if necessary, in order to ensure that
3423     backreferences always work.
3425     4. Increased the compatibility with Perl in a number of ways:
3427     (a) . no longer matches \n by default; an option PCRE_DOTALL is provided
3428     to request this handling. The option can be set at compile or exec time.
3430     (b) $ matches before a terminating newline by default; an option
3431     PCRE_DOLLAR_ENDONLY is provided to override this (but not in multiline
3432     mode). The option can be set at compile or exec time.
3434     (c) The handling of \ followed by a digit other than 0 is now supposed to be
3435     the same as Perl's. If the decimal number it represents is less than 10
3436     or there aren't that many previous left capturing parentheses, an octal
3437     escape is read. Inside a character class, it's always an octal escape,
3438     even if it is a single digit.
3440     (d) An escaped but undefined alphabetic character is taken as a literal,
3441     unless PCRE_EXTRA is set. Currently this just reserves the remaining
3442     escapes.
3444     (e) {0} is now permitted. (The previous item is removed from the compiled
3445     pattern).
3447     5. Changed all the names of code files so that the basic parts are no longer
3448     than 10 characters, and abolished the teeny "globals.c" file.
3450     6. Changed the handling of character classes; they are now done with a 32-byte
3451     bit map always.
3453     7. Added the -d and /D options to pcretest to make it possible to look at the
3454     internals of compilation without having to recompile pcre.
3457     Version 0.95 23-Sep-97
3458     ----------------------
3460     1. Fixed bug in pre-pass concerning escaped "normal" characters such as \x5c or
3461     \x20 at the start of a run of normal characters. These were being treated as
3462     real characters, instead of the source characters being re-checked.
3465     Version 0.94 18-Sep-97
3466     ----------------------
3468     1. The functions are now thread-safe, with the caveat that the global variables
3469     containing pointers to malloc() and free() or alternative functions are the
3470     same for all threads.
3472     2. Get pcre_study() to generate a bitmap of initial characters for non-
3473     anchored patterns when this is possible, and use it if passed to pcre_exec().
3476     Version 0.93 15-Sep-97
3477     ----------------------
3479     1. /(b)|(:+)/ was computing an incorrect first character.
3481     2. Add pcre_study() to the API and the passing of pcre_extra to pcre_exec(),
3482     but not actually doing anything yet.
3484     3. Treat "-" characters in classes that cannot be part of ranges as literals,
3485     as Perl does (e.g. [-az] or [az-]).
3487     4. Set the anchored flag if a branch starts with .* or .*? because that tests
3488     all possible positions.
3490     5. Split up into different modules to avoid including unneeded functions in a
3491     compiled binary. However, compile and exec are still in one module. The "study"
3492     function is split off.
3494     6. The character tables are now in a separate module whose source is generated
3495     by an auxiliary program - but can then be edited by hand if required. There are
3496     now no calls to isalnum(), isspace(), isdigit(), isxdigit(), tolower() or
3497     toupper() in the code.
3499     7. Turn the malloc/free funtions variables into pcre_malloc and pcre_free and
3500     make them global. Abolish the function for setting them, as the caller can now
3501     set them directly.
3504     Version 0.92 11-Sep-97
3505     ----------------------
3507     1. A repeat with a fixed maximum and a minimum of 1 for an ordinary character
3508     (e.g. /a{1,3}/) was broken (I mis-optimized it).
3510     2. Caseless matching was not working in character classes if the characters in
3511     the pattern were in upper case.
3513     3. Make ranges like [W-c] work in the same way as Perl for caseless matching.
3515     4. Make PCRE_ANCHORED public and accept as a compile option.
3517     5. Add an options word to pcre_exec() and accept PCRE_ANCHORED and
3518     PCRE_CASELESS at run time. Add escapes \A and \I to pcretest to cause it to
3519     pass them.
3521     6. Give an error if bad option bits passed at compile or run time.
3523     7. Add PCRE_MULTILINE at compile and exec time, and (?m) as well. Add \M to
3524     pcretest to cause it to pass that flag.
3526     8. Add pcre_info(), to get the number of identifying subpatterns, the stored
3527     options, and the first character, if set.
3529     9. Recognize C+ or C{n,m} where n >= 1 as providing a fixed starting character.
3532     Version 0.91 10-Sep-97
3533     ----------------------
3535     1. PCRE was failing to diagnose unlimited repeats of subpatterns that could
3536     match the empty string as in /(a*)*/. It was looping and ultimately crashing.
3538     2. PCRE was looping on encountering an indefinitely repeated back reference to
3539     a subpattern that had matched an empty string, e.g. /(a|)\1*/. It now does what
3540     Perl does - treats the match as successful.
3542     ****


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