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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.1 12-Mar-07  Version 8.00 ??-???-??
5    ----------------------
6    
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8        was out-of-date, and there was no check on the pcre_compile() error code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    
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    
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.
23    
24    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.
28    
29    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.
33    
34    6.  No libpcreposix.pc file was created for pkg-config; there was just
35        libpcre.pc and libpcrecpp.pc. The omission has been rectified.
36    
37    7.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
38        when UCP support is not needed, by modifying the Python script that
39        generates it from Unicode data files. This should not matter if the module
40        is correctly used as a library, but I received one complaint about 50K of
41        unwanted data. My guess is that the person linked everything into his
42        program rather than using a library. Anyway, it does no harm.
43    
44    8.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
45        was a minimum greater than 1 for a wide character in a possessive
46        repetition. Chaos could result.
47    
48    9.  The restrictions on what a pattern can contain when partial matching is
49        requested for pcre_exec() have been removed. All patterns can now be
50        partially matched by this function. In addition, if there are at least two
51        slots in the offset vector, the offsets of the first-encountered partial
52        match are set in them when PCRE_ERROR_PARTIAL is returned.
53    
54    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
55        synonymous with PCRE_PARTIAL, for backwards compatibility, and
56        PCRE_PARTIAL_HARD, which causes a longer partial match to supersede a
57        shorter full match, and may be more useful for multi-segment matching,
58        especially with pcre_exec().
59    
60    
61    Version 7.9 11-Apr-09
62    ---------------------
63    
64    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
65        (pcretest), all targets were linked against these libraries. This included
66        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
67        libraries. This caused unwanted dependencies to be created. This problem
68        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
69        pcretest is linked with readline.
70    
71    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
72        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
73        moved outside it again, because FALSE and TRUE are already defined in AIX,
74        but BOOL is not.
75    
76    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
77        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
78    
79    4.  The pcregrep documentation said spaces were inserted as well as colons (or
80        hyphens) following file names and line numbers when outputting matching
81        lines. This is not true; no spaces are inserted. I have also clarified the
82        wording for the --colour (or --color) option.
83    
84    5.  In pcregrep, when --colour was used with -o, the list of matching strings
85        was not coloured; this is different to GNU grep, so I have changed it to be
86        the same.
87    
88    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
89        each matching line was coloured. Now it goes on to look for further matches
90        of any of the test patterns, which is the same behaviour as GNU grep.
91    
92    7.  A pattern that could match an empty string could cause pcregrep to loop; it
93        doesn't make sense to accept an empty string match in pcregrep, so I have
94        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
95        seems to be how GNU grep behaves.
96    
97    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
98        start or after a newline", because the conditional assertion was not being
99        correctly handled. The rule now is that both the assertion and what follows
100        in the first alternative must satisfy the test.
101    
102    9.  If auto-callout was enabled in a pattern with a conditional group whose
103        condition was an assertion, PCRE could crash during matching, both with
104        pcre_exec() and pcre_dfa_exec().
105    
106    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
107        used for matching.
108    
109    11. Unicode property support in character classes was not working for
110        characters (bytes) greater than 127 when not in UTF-8 mode.
111    
112    12. Added the -M command line option to pcretest.
113    
114    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
115    
116    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
117    
118    16. Added comments and documentation about mis-use of no_arg in the C++
119        wrapper.
120    
121    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
122        from Martin Jerabek that uses macro names for all relevant character and
123        string constants.
124    
125    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
126        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
127        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
128        these, but not everybody uses configure.
129    
130    19. A conditional group that had only one branch was not being correctly
131        recognized as an item that could match an empty string. This meant that an
132        enclosing group might also not be so recognized, causing infinite looping
133        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
134        with the subject "ab", where knowledge that the repeated group can match
135        nothing is needed in order to break the loop.
136    
137    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
138        exec(), but without supplying a callout function, matching went wrong.
139    
140    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
141        leak if the size of the offset vector was greater than 30. When the vector
142        is smaller, the saved offsets during recursion go onto a local stack
143        vector, but for larger vectors malloc() is used. It was failing to free
144        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
145        error, in fact).
146    
147    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
148        heapframe that is used only when UTF-8 support is enabled. This caused no
149        problem, but was untidy.
150    
151    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
152        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
153        included within another project.
154    
155    24. Steven Van Ingelgem's patches to add more options to the CMake support,
156        slightly modified by me:
157    
158          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
159              not building pcregrep.
160    
161          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
162              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
163    
164    25. Forward references, both numeric and by name, in patterns that made use of
165        duplicate group numbers, could behave incorrectly or give incorrect errors,
166        because when scanning forward to find the reference group, PCRE was not
167        taking into account the duplicate group numbers. A pattern such as
168        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
169    
170    26. Changed a few more instances of "const unsigned char *" to USPTR, making
171        the feature of a custom pointer more persuasive (as requested by a user).
172    
173    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
174        pcretest.c, inside #ifndefs, because it seems they are sometimes already
175        pre-defined.
176    
177    28. Added support for (*UTF8) at the start of a pattern.
178    
179    29. Arrange for flags added by the "release type" setting in CMake to be shown
180        in the configuration summary.
181    
182    
183    Version 7.8 05-Sep-08
184    ---------------------
185    
186    1.  Replaced UCP searching code with optimized version as implemented for Ad
187        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
188        stage table and inline lookup instead of a function, giving speed ups of 2
189        to 5 times on some simple patterns that I tested. Permission was given to
190        distribute the MultiStage2.py script that generates the tables (it's not in
191        the tarball, but is in the Subversion repository).
192    
193    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
194        scripts.
195    
196    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
197        a group with a zero qualifier. The result of the study could be incorrect,
198        or the function might crash, depending on the pattern.
199    
200    4.  Caseless matching was not working for non-ASCII characters in back
201        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
202        It now works when Unicode Property Support is available.
203    
204    5.  In pcretest, an escape such as \x{de} in the data was always generating
205        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
206        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
207        truncation.
208    
209    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
210    
211    7.  Added two (int) casts to pcregrep when printing the difference of two
212        pointers, in case they are 64-bit values.
213    
214    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
215        test 2 if it fails.
216    
217    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
218        and a #define of that name to empty if it is not externally set. This is to
219        allow users of MSVC to set it if necessary.
220    
221    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
222        the convenience functions in the pcre_get.c source file.
223    
224    11. An option change at the start of a pattern that had top-level alternatives
225        could cause overwriting and/or a crash. This command provoked a crash in
226        some environments:
227    
228          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
229    
230        This potential security problem was recorded as CVE-2008-2371.
231    
232    12. For a pattern where the match had to start at the beginning or immediately
233        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
234        pcre_dfa_exec() could read past the end of the passed subject if there was
235        no match. To help with detecting such bugs (e.g. with valgrind), I modified
236        pcretest so that it places the subject at the end of its malloc-ed buffer.
237    
238    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
239        exec() might read past the end of the data buffer in UTF-8 mode.
240    
241    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
242        the data contained the byte 0x85 as part of a UTF-8 character within its
243        first line. This applied both to normal and DFA matching.
244    
245    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
246        /^[^d]*?$/8 failed to match "abc".
247    
248    16. Added a missing copyright notice to pcrecpp_internal.h.
249    
250    17. Make it more clear in the documentation that values returned from
251        pcre_exec() in ovector are byte offsets, not character counts.
252    
253    18. Tidied a few places to stop certain compilers from issuing warnings.
254    
255    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
256        supplied by Stefan Weber. I made a further small update for 7.8 because
257        there is a change of source arrangements: the pcre_searchfuncs.c module is
258        replaced by pcre_ucd.c.
259    
260    
261    Version 7.7 07-May-08
262    ---------------------
263    
264    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
265        a string to a long long, pretend we don't even have a long long." This is
266        done by checking for the strtoq, strtoll, and _strtoi64 functions.
267    
268    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
269        pre-7.6 versions, which defined a global no_arg variable instead of putting
270        it in the RE class. (See also #8 below.)
271    
272    3.  Remove a line of dead code, identified by coverity and reported by Nuno
273        Lopes.
274    
275    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
276    
277        (1) The include/exclude patterns were being applied to the whole pathnames
278            of files, instead of just to the final components.
279    
280        (2) If there was more than one level of directory, the subdirectories were
281            skipped unless they satisfied the include/exclude conditions. This is
282            inconsistent with GNU grep (and could even be seen as contrary to the
283            pcregrep specification - which I improved to make it absolutely clear).
284            The action now is always to scan all levels of directory, and just
285            apply the include/exclude patterns to regular files.
286    
287    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
288        --exclude_dir in the tests to avoid scanning .svn directories.
289    
290    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
291        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
292        doesn't support NULs in patterns.
293    
294    7.  Added some missing "const"s to declarations of static tables in
295        pcre_compile.c and pcre_dfa_exec.c.
296    
297    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
298        caused by fix #2  above. (Subsequently also a second patch to fix the
299        first patch. And a third patch - this was a messy problem.)
300    
301    9.  Applied Craig's patch to remove the use of push_back().
302    
303    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
304        matching function regexec().
305    
306    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
307        which, however, unlike Perl's \g{...}, are subroutine calls, not back
308        references. PCRE supports relative numbers with this syntax (I don't think
309        Oniguruma does).
310    
311    12. Previously, a group with a zero repeat such as (...){0} was completely
312        omitted from the compiled regex. However, this means that if the group
313        was called as a subroutine from elsewhere in the pattern, things went wrong
314        (an internal error was given). Such groups are now left in the compiled
315        pattern, with a new opcode that causes them to be skipped at execution
316        time.
317    
318    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
319        to the way PCRE behaves:
320    
321        (a) A lone ] character is dis-allowed (Perl treats it as data).
322    
323        (b) A back reference to an unmatched subpattern matches an empty string
324            (Perl fails the current match path).
325    
326        (c) A data ] in a character class must be notated as \] because if the
327            first data character in a class is ], it defines an empty class. (In
328            Perl it is not possible to have an empty class.) The empty class []
329            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
330            The negative empty class [^] matches any one character, independently
331            of the DOTALL setting.
332    
333    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
334        non-existent subpattern following a character class starting with ']' and
335        containing () gave an internal compiling error instead of "reference to
336        non-existent subpattern". Fortunately, when the pattern did exist, the
337        compiled code was correct. (When scanning forwards to check for the
338        existencd of the subpattern, it was treating the data ']' as terminating
339        the class, so got the count wrong. When actually compiling, the reference
340        was subsequently set up correctly.)
341    
342    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
343        it was being rejected as not supported by pcre_dfa_exec(), even though
344        other assertions are supported. I have made pcre_dfa_exec() support
345        (*FAIL).
346    
347    16. The implementation of 13c above involved the invention of a new opcode,
348        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
349        cannot be changed at match time, I realized I could make a small
350        improvement to matching performance by compiling OP_ALLANY instead of
351        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
352        on the OP_ANY path.
353    
354    17. Compiling pcretest on Windows with readline support failed without the
355        following two fixes: (1) Make the unistd.h include conditional on
356        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
357    
358    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
359        ncurses library to be included for pcretest when ReadLine support is
360        requested, but also to allow for it to be overridden. This patch came from
361        Daniel Bergström.
362    
363    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
364        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
365        any errors with the current Unicode tables. Thanks to Peter Kankowski for
366        spotting this.
367    
368    
369    Version 7.6 28-Jan-08
370    ---------------------
371    
372    1.  A character class containing a very large number of characters with
373        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
374        overflow.
375    
376    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
377        HAVE_LONG_LONG is not defined.
378    
379    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
380        bring them up to date and include new features. This patch includes:
381    
382        - Fixed PH's badly added libz and libbz2 support.
383        - Fixed a problem with static linking.
384        - Added pcredemo. [But later removed - see 7 below.]
385        - Fixed dftables problem and added an option.
386        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
387            HAVE_LONG_LONG.
388        - Added readline support for pcretest.
389        - Added an listing of the option settings after cmake has run.
390    
391    4.  A user submitted a patch to Makefile that makes it easy to create
392        "pcre.dll" under mingw when using Configure/Make. I added stuff to
393        Makefile.am that cause it to include this special target, without
394        affecting anything else. Note that the same mingw target plus all
395        the other distribution libraries and programs are now supported
396        when configuring with CMake (see 6 below) instead of with
397        Configure/Make.
398    
399    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
400        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
401        exported in the Windows port". It has not yet been confirmed that the patch
402        solves the problem, but it does no harm.
403    
404    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
405        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
406        with CMake, and also correct the comment about stack recursion.
407    
408    7.  Remove the automatic building of pcredemo from the ./configure system and
409        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
410        of a program that users should build themselves after PCRE is installed, so
411        building it automatically is not really right. What is more, it gave
412        trouble in some build environments.
413    
414    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
415    
416    
417    Version 7.5 10-Jan-08
418    ---------------------
419    
420    1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
421        values in parens when parsing an RE using the C++ wrapper."
422    
423    2.  Negative specials like \S did not work in character classes in UTF-8 mode.
424        Characters greater than 255 were excluded from the class instead of being
425        included.
426    
427    3.  The same bug as (2) above applied to negated POSIX classes such as
428        [:^space:].
429    
430    4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
431        defined or documented. It seems to have been a typo for PCRE_STATIC, so
432        I have changed it.
433    
434    5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
435        first named subpattern) and a construct such as (?&a) would reference the
436        first named subpattern whose name started with "a" (in other words, the
437        length check was missing). Both these problems are fixed. "Subpattern name
438        expected" is now given for (?&) (a zero-length name), and this patch also
439        makes it give the same error for \k'' (previously it complained that that
440        was a reference to a non-existent subpattern).
441    
442    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
443        this is right because (?- can be followed by option settings as well as by
444        digits. I have, however, made the messages clearer.
445    
446    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
447        than the number used in the conditional) now cause a compile-time error.
448        This is actually not compatible with Perl, which accepts such patterns, but
449        treats the conditional as always being FALSE (as PCRE used to), but it
450        seems to me that giving a diagnostic is better.
451    
452    8.  Change "alphameric" to the more common word "alphanumeric" in comments
453        and messages.
454    
455    9.  Fix two occurrences of "backslash" in comments that should have been
456        "backspace".
457    
458    10. Remove two redundant lines of code that can never be obeyed (their function
459        was moved elsewhere).
460    
461    11. The program that makes PCRE's Unicode character property table had a bug
462        which caused it to generate incorrect table entries for sequences of
463        characters that have the same character type, but are in different scripts.
464        It amalgamated them into a single range, with the script of the first of
465        them. In other words, some characters were in the wrong script. There were
466        thirteen such cases, affecting characters in the following ranges:
467    
468          U+002b0 - U+002c1
469          U+0060c - U+0060d
470          U+0061e - U+00612
471          U+0064b - U+0065e
472          U+0074d - U+0076d
473          U+01800 - U+01805
474          U+01d00 - U+01d77
475          U+01d9b - U+01dbf
476          U+0200b - U+0200f
477          U+030fc - U+030fe
478          U+03260 - U+0327f
479          U+0fb46 - U+0fbb1
480          U+10450 - U+1049d
481    
482    12. The -o option (show only the matching part of a line) for pcregrep was not
483        compatible with GNU grep in that, if there was more than one match in a
484        line, it showed only the first of them. It now behaves in the same way as
485        GNU grep.
486    
487    13. If the -o and -v options were combined for pcregrep, it printed a blank
488        line for every non-matching line. GNU grep prints nothing, and pcregrep now
489        does the same. The return code can be used to tell if there were any
490        non-matching lines.
491    
492    14. Added --file-offsets and --line-offsets to pcregrep.
493    
494    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
495        infinitely looping recursion. The bug was that positive lookaheads were not
496        being skipped when checking for a possible empty match (negative lookaheads
497        and both kinds of lookbehind were skipped).
498    
499    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
500        inclusion of <windows.h> to before rather than after the definition of
501        INVALID_FILE_ATTRIBUTES (patch from David Byron).
502    
503    17. Specifying a possessive quantifier with a specific limit for a Unicode
504        character property caused pcre_compile() to compile bad code, which led at
505        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
506        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
507        caused the error; without that there was no problem.
508    
509    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
510    
511    19. Added --enable-pcretest-libreadline.
512    
513    20. In pcrecpp.cc, the variable 'count' was incremented twice in
514        RE::GlobalReplace(). As a result, the number of replacements returned was
515        double what it should be. I removed one of the increments, but Craig sent a
516        later patch that removed the other one (the right fix) and added unit tests
517        that check the return values (which was not done before).
518    
519    21. Several CMake things:
520    
521        (1) Arranged that, when cmake is used on Unix, the libraries end up with
522            the names libpcre and libpcreposix, not just pcre and pcreposix.
523    
524        (2) The above change means that pcretest and pcregrep are now correctly
525            linked with the newly-built libraries, not previously installed ones.
526    
527        (3) Added PCRE_SUPPORT_LIBREADLINE, PCRE_SUPPORT_LIBZ, PCRE_SUPPORT_LIBBZ2.
528    
529    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
530        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
531        UTF-8 newline character). The key issue is that the pattern starts .*;
532        this means that the match must be either at the beginning, or after a
533        newline. The bug was in the code for advancing after a failed match and
534        checking that the new position followed a newline. It was not taking
535        account of UTF-8 characters correctly.
536    
537    23. PCRE was behaving differently from Perl in the way it recognized POSIX
538        character classes. PCRE was not treating the sequence [:...:] as a
539        character class unless the ... were all letters. Perl, however, seems to
540        allow any characters between [: and :], though of course it rejects as
541        unknown any "names" that contain non-letters, because all the known class
542        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
543        for example, whereas PCRE did not - it did not recognize a POSIX character
544        class. This seemed a bit dangerous, so the code has been changed to be
545        closer to Perl. The behaviour is not identical to Perl, because PCRE will
546        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
547        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
548        Perl does, and where it didn't before.
549    
550    24. Rewrite so as to remove the single use of %n from pcregrep because in some
551        Windows environments %n is disabled by default.
552    
553    
554    Version 7.4 21-Sep-07
555    ---------------------
556    
557    1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This
558        means that a class such as [\s] counted as "explicit reference to CR or
559        LF". That isn't really right - the whole point of the change was to try to
560        help when there was an actual mention of one of the two characters. So now
561        the change happens only if \r or \n (or a literal CR or LF) character is
562        encountered.
563    
564    2.  The 32-bit options word was also used for 6 internal flags, but the numbers
565        of both had grown to the point where there were only 3 bits left.
566        Fortunately, there was spare space in the data structure, and so I have
567        moved the internal flags into a new 16-bit field to free up more option
568        bits.
569    
570    3.  The appearance of (?J) at the start of a pattern set the DUPNAMES option,
571        but did not set the internal JCHANGED flag - either of these is enough to
572        control the way the "get" function works - but the PCRE_INFO_JCHANGED
573        facility is supposed to tell if (?J) was ever used, so now (?J) at the
574        start sets both bits.
575    
576    4.  Added options (at build time, compile time, exec time) to change \R from
577        matching any Unicode line ending sequence to just matching CR, LF, or CRLF.
578    
579    5.  doc/pcresyntax.html was missing from the distribution.
580    
581    6.  Put back the definition of PCRE_ERROR_NULLWSLIMIT, for backward
582        compatibility, even though it is no longer used.
583    
584    7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and
585        strtoull to pcrecpp.cc to select the available functions in WIN32 when the
586        windows.h file is present (where different names are used). [This was
587        reversed later after testing - see 16 below.]
588    
589    8.  Changed all #include <config.h> to #include "config.h". There were also
590        some further <pcre.h> cases that I changed to "pcre.h".
591    
592    9.  When pcregrep was used with the --colour option, it missed the line ending
593        sequence off the lines that it output.
594    
595    10. It was pointed out to me that arrays of string pointers cause lots of
596        relocations when a shared library is dynamically loaded. A technique of
597        using a single long string with a table of offsets can drastically reduce
598        these. I have refactored PCRE in four places to do this. The result is
599        dramatic:
600    
601          Originally:                          290
602          After changing UCP table:            187
603          After changing error message table:   43
604          After changing table of "verbs"       36
605          After changing table of Posix names   22
606    
607        Thanks to the folks working on Gregex for glib for this insight.
608    
609    11. --disable-stack-for-recursion caused compiling to fail unless -enable-
610        unicode-properties was also set.
611    
612    12. Updated the tests so that they work when \R is defaulted to ANYCRLF.
613    
614    13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously
615        checked only for CRLF.
616    
617    14. Added casts to pcretest.c to avoid compiler warnings.
618    
619    15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
620    
621    16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
622        and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
623        entirely. This removes changes made in 7 above.
624    
625    17. The CMake files have been updated, and there is now more information about
626        building with CMake in the NON-UNIX-USE document.
627    
628    
629    Version 7.3 28-Aug-07
630    ---------------------
631    
632     1. In the rejigging of the build system that eventually resulted in 7.1, the
633        line "#include <pcre.h>" was included in pcre_internal.h. The use of angle
634        brackets there is not right, since it causes compilers to look for an
635        installed pcre.h, not the version that is in the source that is being
636        compiled (which of course may be different). I have changed it back to:
637    
638          #include "pcre.h"
639    
640        I have a vague recollection that the change was concerned with compiling in
641        different directories, but in the new build system, that is taken care of
642        by the VPATH setting the Makefile.
643    
644     2. The pattern .*$ when run in not-DOTALL UTF-8 mode with newline=any failed
645        when the subject happened to end in the byte 0x85 (e.g. if the last
646        character was \x{1ec5}). *Character* 0x85 is one of the "any" newline
647        characters but of course it shouldn't be taken as a newline when it is part
648        of another character. The bug was that, for an unlimited repeat of . in
649        not-DOTALL UTF-8 mode, PCRE was advancing by bytes rather than by
650        characters when looking for a newline.
651    
652     3. A small performance improvement in the DOTALL UTF-8 mode .* case.
653    
654     4. Debugging: adjusted the names of opcodes for different kinds of parentheses
655        in debug output.
656    
657     5. Arrange to use "%I64d" instead of "%lld" and "%I64u" instead of "%llu" for
658        long printing in the pcrecpp unittest when running under MinGW.
659    
660     6. ESC_K was left out of the EBCDIC table.
661    
662     7. Change 7.0/38 introduced a new limit on the number of nested non-capturing
663        parentheses; I made it 1000, which seemed large enough. Unfortunately, the
664        limit also applies to "virtual nesting" when a pattern is recursive, and in
665        this case 1000 isn't so big. I have been able to remove this limit at the
666        expense of backing off one optimization in certain circumstances. Normally,
667        when pcre_exec() would call its internal match() function recursively and
668        immediately return the result unconditionally, it uses a "tail recursion"
669        feature to save stack. However, when a subpattern that can match an empty
670        string has an unlimited repetition quantifier, it no longer makes this
671        optimization. That gives it a stack frame in which to save the data for
672        checking that an empty string has been matched. Previously this was taken
673        from the 1000-entry workspace that had been reserved. So now there is no
674        explicit limit, but more stack is used.
675    
676     8. Applied Daniel's patches to solve problems with the import/export magic
677        syntax that is required for Windows, and which was going wrong for the
678        pcreposix and pcrecpp parts of the library. These were overlooked when this
679        problem was solved for the main library.
680    
681     9. There were some crude static tests to avoid integer overflow when computing
682        the size of patterns that contain repeated groups with explicit upper
683        limits. As the maximum quantifier is 65535, the maximum group length was
684        set at 30,000 so that the product of these two numbers did not overflow a
685        32-bit integer. However, it turns out that people want to use groups that
686        are longer than 30,000 bytes (though not repeat them that many times).
687        Change 7.0/17 (the refactoring of the way the pattern size is computed) has
688        made it possible to implement the integer overflow checks in a much more
689        dynamic way, which I have now done. The artificial limitation on group
690        length has been removed - we now have only the limit on the total length of
691        the compiled pattern, which depends on the LINK_SIZE setting.
692    
693    10. Fixed a bug in the documentation for get/copy named substring when
694        duplicate names are permitted. If none of the named substrings are set, the
695        functions return PCRE_ERROR_NOSUBSTRING (7); the doc said they returned an
696        empty string.
697    
698    11. Because Perl interprets \Q...\E at a high level, and ignores orphan \E
699        instances, patterns such as [\Q\E] or [\E] or even [^\E] cause an error,
700        because the ] is interpreted as the first data character and the
701        terminating ] is not found. PCRE has been made compatible with Perl in this
702        regard. Previously, it interpreted [\Q\E] as an empty class, and [\E] could
703        cause memory overwriting.
704    
705    10. Like Perl, PCRE automatically breaks an unlimited repeat after an empty
706        string has been matched (to stop an infinite loop). It was not recognizing
707        a conditional subpattern that could match an empty string if that
708        subpattern was within another subpattern. For example, it looped when
709        trying to match  (((?(1)X|))*)  but it was OK with  ((?(1)X|)*)  where the
710        condition was not nested. This bug has been fixed.
711    
712    12. A pattern like \X?\d or \P{L}?\d in non-UTF-8 mode could cause a backtrack
713        past the start of the subject in the presence of bytes with the top bit
714        set, for example "\x8aBCD".
715    
716    13. Added Perl 5.10 experimental backtracking controls (*FAIL), (*F), (*PRUNE),
717        (*SKIP), (*THEN), (*COMMIT), and (*ACCEPT).
718    
719    14. Optimized (?!) to (*FAIL).
720    
721    15. Updated the test for a valid UTF-8 string to conform to the later RFC 3629.
722        This restricts code points to be within the range 0 to 0x10FFFF, excluding
723        the "low surrogate" sequence 0xD800 to 0xDFFF. Previously, PCRE allowed the
724        full range 0 to 0x7FFFFFFF, as defined by RFC 2279. Internally, it still
725        does: it's just the validity check that is more restrictive.
726    
727    16. Inserted checks for integer overflows during escape sequence (backslash)
728        processing, and also fixed erroneous offset values for syntax errors during
729        backslash processing.
730    
731    17. Fixed another case of looking too far back in non-UTF-8 mode (cf 12 above)
732        for patterns like [\PPP\x8a]{1,}\x80 with the subject "A\x80".
733    
734    18. An unterminated class in a pattern like (?1)\c[ with a "forward reference"
735        caused an overrun.
736    
737    19. A pattern like (?:[\PPa*]*){8,} which had an "extended class" (one with
738        something other than just ASCII characters) inside a group that had an
739        unlimited repeat caused a loop at compile time (while checking to see
740        whether the group could match an empty string).
741    
742    20. Debugging a pattern containing \p or \P could cause a crash. For example,
743        [\P{Any}] did so. (Error in the code for printing property names.)
744    
745    21. An orphan \E inside a character class could cause a crash.
746    
747    22. A repeated capturing bracket such as (A)? could cause a wild memory
748        reference during compilation.
749    
750    23. There are several functions in pcre_compile() that scan along a compiled
751        expression for various reasons (e.g. to see if it's fixed length for look
752        behind). There were bugs in these functions when a repeated \p or \P was
753        present in the pattern. These operators have additional parameters compared
754        with \d, etc, and these were not being taken into account when moving along
755        the compiled data. Specifically:
756    
757        (a) A item such as \p{Yi}{3} in a lookbehind was not treated as fixed
758            length.
759    
760        (b) An item such as \pL+ within a repeated group could cause crashes or
761            loops.
762    
763        (c) A pattern such as \p{Yi}+(\P{Yi}+)(?1) could give an incorrect
764            "reference to non-existent subpattern" error.
765    
766        (d) A pattern like (\P{Yi}{2}\277)? could loop at compile time.
767    
768    24. A repeated \S or \W in UTF-8 mode could give wrong answers when multibyte
769        characters were involved (for example /\S{2}/8g with "A\x{a3}BC").
770    
771    25. Using pcregrep in multiline, inverted mode (-Mv) caused it to loop.
772    
773    26. Patterns such as [\P{Yi}A] which include \p or \P and just one other
774        character were causing crashes (broken optimization).
775    
776    27. Patterns such as (\P{Yi}*\277)* (group with possible zero repeat containing
777        \p or \P) caused a compile-time loop.
778    
779    28. More problems have arisen in unanchored patterns when CRLF is a valid line
780        break. For example, the unstudied pattern [\r\n]A does not match the string
781        "\r\nA" because change 7.0/46 below moves the current point on by two
782        characters after failing to match at the start. However, the pattern \nA
783        *does* match, because it doesn't start till \n, and if [\r\n]A is studied,
784        the same is true. There doesn't seem any very clean way out of this, but
785        what I have chosen to do makes the common cases work: PCRE now takes note
786        of whether there can be an explicit match for \r or \n anywhere in the
787        pattern, and if so, 7.0/46 no longer applies. As part of this change,
788        there's a new PCRE_INFO_HASCRORLF option for finding out whether a compiled
789        pattern has explicit CR or LF references.
790    
791    29. Added (*CR) etc for changing newline setting at start of pattern.
792    
793    
794    Version 7.2 19-Jun-07
795    ---------------------
796    
797     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
798        which is apparently normally available under Windows.
799    
800     2. Re-jig the pcregrep tests with different newline settings in an attempt
801        to make them independent of the local environment's newline setting.
802    
803     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
804    
805     4. Some of the "internals" tests were previously cut out when the link size
806        was not 2, because the output contained actual offsets. The recent new
807        "Z" feature of pcretest means that these can be cut out, making the tests
808        usable with all link sizes.
809    
810     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
811        stack recursion. This gives a massive performance boost under BSD, but just
812        a small improvement under Linux. However, it saves one field in the frame
813        in all cases.
814    
815     6. Added more features from the forthcoming Perl 5.10:
816    
817        (a) (?-n) (where n is a string of digits) is a relative subroutine or
818            recursion call. It refers to the nth most recently opened parentheses.
819    
820        (b) (?+n) is also a relative subroutine call; it refers to the nth next
821            to be opened parentheses.
822    
823        (c) Conditions that refer to capturing parentheses can be specified
824            relatively, for example, (?(-2)... or (?(+3)...
825    
826        (d) \K resets the start of the current match so that everything before
827            is not part of it.
828    
829        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
830    
831        (f) \g{name} is another synonym - part of Perl 5.10's unification of
832            reference syntax.
833    
834        (g) (?| introduces a group in which the numbering of parentheses in each
835            alternative starts with the same number.
836    
837        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
838    
839     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
840        PCRE_INFO_JCHANGED.
841    
842     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
843        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
844        for detecting groups that can match an empty string.
845    
846     9. A pattern with a very large number of alternatives (more than several
847        hundred) was running out of internal workspace during the pre-compile
848        phase, where pcre_compile() figures out how much memory will be needed. A
849        bit of new cunning has reduced the workspace needed for groups with
850        alternatives. The 1000-alternative test pattern now uses 12 bytes of
851        workspace instead of running out of the 4096 that are available.
852    
853    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
854    
855    11. Applied patch from Google to remove an optimization that didn't quite work.
856        The report of the bug said:
857    
858          pcrecpp::RE("a*").FullMatch("aaa") matches, while
859          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
860          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
861    
862    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
863        it matched the wrong number of bytes.
864    
865    
866    Version 7.1 24-Apr-07
867  ---------------------  ---------------------
868    
869   1. Applied Bob Rossi and Daniel G's patches to convert the build system to one   1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
# Line 33  Version 7.1 12-Mar-07 Line 895  Version 7.1 12-Mar-07
895   5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan   5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan
896      Weber: (1) pcre_internal.h was missing some function renames; (2) updated      Weber: (1) pcre_internal.h was missing some function renames; (2) updated
897      makevp.bat for the current PCRE, using the additional files      makevp.bat for the current PCRE, using the additional files
898      makevp-c.txt, makevp-l.txt, and pcregexp.pas.      makevp_c.txt, makevp_l.txt, and pcregexp.pas.
899    
900   6. A Windows user reported a minor discrepancy with test 2, which turned out   6. A Windows user reported a minor discrepancy with test 2, which turned out
901      to be caused by a trailing space on an input line that had got lost in his      to be caused by a trailing space on an input line that had got lost in his
# Line 127  Version 7.1 12-Mar-07 Line 989  Version 7.1 12-Mar-07
989      in an attempt to make files that differ only in their line terminators      in an attempt to make files that differ only in their line terminators
990      compare equal. This works on Linux.      compare equal. This works on Linux.
991    
992    17. Under certain error circumstances pcregrep might try to free random memory
993        as it exited. This is now fixed, thanks to valgrind.
994    
995    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
996        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
997        was because its rules for how to advance for /g after matching an empty
998        string at the end of a line did not allow for this case. They now check for
999        it specially.
1000    
1001    20. pcretest is supposed to handle patterns and data of any length, by
1002        extending its buffers when necessary. It was getting this wrong when the
1003        buffer for a data line had to be extended.
1004    
1005    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
1006        CRLF as a newline sequence.
1007    
1008    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
1009        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
1010        I have nevertheless tidied it up.
1011    
1012    23. Added some casts to kill warnings from HP-UX ia64 compiler.
1013    
1014    24. Added a man page for pcre-config.
1015    
1016    
1017  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06
1018  ---------------------  ---------------------

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