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revision 101 by ph10, Tue Mar 6 15:19:44 2007 UTC revision 328 by ph10, Wed Mar 26 17:39:06 2008 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.1 05-Mar-07  Version 7.7 05-Mar-08
5  ---------------------  ---------------------
6    
7   1. Applied Bob Rossi and Daniel G's patches to convert the build system to one  1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
8      that is more "standard", making use of automake and other autotools. There      a string to a long long, pretend we don't even have a long long." This is
9      is some re-arrangement of the files and adjustment of comments consequent      done by checking for the strtoq, strtoll, and _strtoi64 functions.
     on this.  
10    
11   2. Part of the patch fixed a problem with the pcregrep tests. The test of -r  2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
12      for recursive directory scanning broke on some systems because the files      pre-7.6 versions, which defined a global no_arg variable instead of putting
13      are not scanned in any specific order and on different systems the order      it in the RE class.
     was different. A call to "sort" has been inserted into RunGrepTest for the  
     approprate test as a short-term fix. In the longer term there may be an  
     alternative.  
14    
15   3. I had an email from Eric Raymond about problems translating some of PCRE's  3.  Remove a line of dead code, identified by coverity and reported by Nuno
16      man pages to HTML (despite the fact that I distribute HTML pages, some      Lopes.
     people do their own conversions for various reasons). The problems  
     concerned the use of low-level troff macros .br and .in. I have therefore  
     removed all such uses from the man pages (some were redundant, some could  
     be replaced by .nf/.fi pairs). The maintain/132html script that I use to  
     generate HTML has been updated to handle .nf/.fi and to complain if it  
     encounters .br or .in.  
17    
18   4. Updated comments in configure.ac that get placed in config.h.in and also  4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
19      arranged for config.h to be included in the distribution, for the benefit  
20      of those who have to compile without Autotools (compare pcre.h).      (1) The include/exclude patterns were being applied to the whole pathnames
21            of files, instead of just to the final components.
22    
23        (2) If there was more than one level of directory, the subdirectories were
24            skipped unless they satisfied the include/exclude conditions. This is
25            inconsistent with GNU grep (and could even be seen as contrary to the
26            pcregrep specification - which I improved to make it absolutely clear).
27            The action now is always to scan all levels of directory, and just
28            apply the include/exclude patterns to regular files.
29    
30    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
31        --exclude_dir in the tests to avoid scanning .svn directories.
32    
33    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
34        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
35        doesn't support NULs in patterns.
36    
37   5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan  7.  Added some missing "const"s to declarations of static tables in
38      Weber: (1) pcre_internal.h was missing some function renames; (2) updated      pcre_compile.c and pcre_dfa_exec.c.
     makevp.bat for the current PCRE, using the additional files !compile.txt,  
     !linklib.txt, and pcregexp.pas.  
39    
40    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
41        caused by fix #2  above.
42    
43    
44    Version 7.6 28-Jan-08
45    ---------------------
46    
47    1.  A character class containing a very large number of characters with
48        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
49        overflow.
50    
51    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
52        HAVE_LONG_LONG is not defined.
53    
54    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
55        bring them up to date and include new features. This patch includes:
56    
57        - Fixed PH's badly added libz and libbz2 support.
58        - Fixed a problem with static linking.
59        - Added pcredemo. [But later removed - see 7 below.]
60        - Fixed dftables problem and added an option.
61        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
62            HAVE_LONG_LONG.
63        - Added readline support for pcretest.
64        - Added an listing of the option settings after cmake has run.
65    
66    4.  A user submitted a patch to Makefile that makes it easy to create
67        "pcre.dll" under mingw when using Configure/Make. I added stuff to
68        Makefile.am that cause it to include this special target, without
69        affecting anything else. Note that the same mingw target plus all
70        the other distribution libraries and programs are now supported
71        when configuring with CMake (see 6 below) instead of with
72        Configure/Make.
73    
74    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
75        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
76        exported in the Windows port". It has not yet been confirmed that the patch
77        solves the problem, but it does no harm.
78    
79    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
80        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
81        with CMake, and also correct the comment about stack recursion.
82    
83    7.  Remove the automatic building of pcredemo from the ./configure system and
84        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
85        of a program that users should build themselves after PCRE is installed, so
86        building it automatically is not really right. What is more, it gave
87        trouble in some build environments.
88    
89    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
90    
91    
92    Version 7.5 10-Jan-08
93    ---------------------
94    
95    1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
96        values in parens when parsing an RE using the C++ wrapper."
97    
98    2.  Negative specials like \S did not work in character classes in UTF-8 mode.
99        Characters greater than 255 were excluded from the class instead of being
100        included.
101    
102    3.  The same bug as (2) above applied to negated POSIX classes such as
103        [:^space:].
104    
105    4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
106        defined or documented. It seems to have been a typo for PCRE_STATIC, so
107        I have changed it.
108    
109    5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
110        first named subpattern) and a construct such as (?&a) would reference the
111        first named subpattern whose name started with "a" (in other words, the
112        length check was missing). Both these problems are fixed. "Subpattern name
113        expected" is now given for (?&) (a zero-length name), and this patch also
114        makes it give the same error for \k'' (previously it complained that that
115        was a reference to a non-existent subpattern).
116    
117    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
118        this is right because (?- can be followed by option settings as well as by
119        digits. I have, however, made the messages clearer.
120    
121    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
122        than the number used in the conditional) now cause a compile-time error.
123        This is actually not compatible with Perl, which accepts such patterns, but
124        treats the conditional as always being FALSE (as PCRE used to), but it
125        seems to me that giving a diagnostic is better.
126    
127    8.  Change "alphameric" to the more common word "alphanumeric" in comments
128        and messages.
129    
130    9.  Fix two occurrences of "backslash" in comments that should have been
131        "backspace".
132    
133    10. Remove two redundant lines of code that can never be obeyed (their function
134        was moved elsewhere).
135    
136    11. The program that makes PCRE's Unicode character property table had a bug
137        which caused it to generate incorrect table entries for sequences of
138        characters that have the same character type, but are in different scripts.
139        It amalgamated them into a single range, with the script of the first of
140        them. In other words, some characters were in the wrong script. There were
141        thirteen such cases, affecting characters in the following ranges:
142    
143          U+002b0 - U+002c1
144          U+0060c - U+0060d
145          U+0061e - U+00612
146          U+0064b - U+0065e
147          U+0074d - U+0076d
148          U+01800 - U+01805
149          U+01d00 - U+01d77
150          U+01d9b - U+01dbf
151          U+0200b - U+0200f
152          U+030fc - U+030fe
153          U+03260 - U+0327f
154          U+0fb46 - U+0fbb1
155          U+10450 - U+1049d
156    
157    12. The -o option (show only the matching part of a line) for pcregrep was not
158        compatible with GNU grep in that, if there was more than one match in a
159        line, it showed only the first of them. It now behaves in the same way as
160        GNU grep.
161    
162    13. If the -o and -v options were combined for pcregrep, it printed a blank
163        line for every non-matching line. GNU grep prints nothing, and pcregrep now
164        does the same. The return code can be used to tell if there were any
165        non-matching lines.
166    
167    14. Added --file-offsets and --line-offsets to pcregrep.
168    
169    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
170        infinitely looping recursion. The bug was that positive lookaheads were not
171        being skipped when checking for a possible empty match (negative lookaheads
172        and both kinds of lookbehind were skipped).
173    
174    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
175        inclusion of <windows.h> to before rather than after the definition of
176        INVALID_FILE_ATTRIBUTES (patch from David Byron).
177    
178    17. Specifying a possessive quantifier with a specific limit for a Unicode
179        character property caused pcre_compile() to compile bad code, which led at
180        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
181        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
182        caused the error; without that there was no problem.
183    
184    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
185    
186    19. Added --enable-pcretest-libreadline.
187    
188    20. In pcrecpp.cc, the variable 'count' was incremented twice in
189        RE::GlobalReplace(). As a result, the number of replacements returned was
190        double what it should be. I removed one of the increments, but Craig sent a
191        later patch that removed the other one (the right fix) and added unit tests
192        that check the return values (which was not done before).
193    
194    21. Several CMake things:
195    
196        (1) Arranged that, when cmake is used on Unix, the libraries end up with
197            the names libpcre and libpcreposix, not just pcre and pcreposix.
198    
199        (2) The above change means that pcretest and pcregrep are now correctly
200            linked with the newly-built libraries, not previously installed ones.
201    
202        (3) Added PCRE_SUPPORT_LIBREADLINE, PCRE_SUPPORT_LIBZ, PCRE_SUPPORT_LIBBZ2.
203    
204    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
205        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
206        UTF-8 newline character). The key issue is that the pattern starts .*;
207        this means that the match must be either at the beginning, or after a
208        newline. The bug was in the code for advancing after a failed match and
209        checking that the new position followed a newline. It was not taking
210        account of UTF-8 characters correctly.
211    
212    23. PCRE was behaving differently from Perl in the way it recognized POSIX
213        character classes. PCRE was not treating the sequence [:...:] as a
214        character class unless the ... were all letters. Perl, however, seems to
215        allow any characters between [: and :], though of course it rejects as
216        unknown any "names" that contain non-letters, because all the known class
217        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
218        for example, whereas PCRE did not - it did not recognize a POSIX character
219        class. This seemed a bit dangerous, so the code has been changed to be
220        closer to Perl. The behaviour is not identical to Perl, because PCRE will
221        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
222        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
223        Perl does, and where it didn't before.
224    
225    24. Rewrite so as to remove the single use of %n from pcregrep because in some
226        Windows environments %n is disabled by default.
227    
228    
229    Version 7.4 21-Sep-07
230    ---------------------
231    
232    1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This
233        means that a class such as [\s] counted as "explicit reference to CR or
234        LF". That isn't really right - the whole point of the change was to try to
235        help when there was an actual mention of one of the two characters. So now
236        the change happens only if \r or \n (or a literal CR or LF) character is
237        encountered.
238    
239    2.  The 32-bit options word was also used for 6 internal flags, but the numbers
240        of both had grown to the point where there were only 3 bits left.
241        Fortunately, there was spare space in the data structure, and so I have
242        moved the internal flags into a new 16-bit field to free up more option
243        bits.
244    
245    3.  The appearance of (?J) at the start of a pattern set the DUPNAMES option,
246        but did not set the internal JCHANGED flag - either of these is enough to
247        control the way the "get" function works - but the PCRE_INFO_JCHANGED
248        facility is supposed to tell if (?J) was ever used, so now (?J) at the
249        start sets both bits.
250    
251    4.  Added options (at build time, compile time, exec time) to change \R from
252        matching any Unicode line ending sequence to just matching CR, LF, or CRLF.
253    
254    5.  doc/pcresyntax.html was missing from the distribution.
255    
256    6.  Put back the definition of PCRE_ERROR_NULLWSLIMIT, for backward
257        compatibility, even though it is no longer used.
258    
259    7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and
260        strtoull to pcrecpp.cc to select the available functions in WIN32 when the
261        windows.h file is present (where different names are used). [This was
262        reversed later after testing - see 16 below.]
263    
264    8.  Changed all #include <config.h> to #include "config.h". There were also
265        some further <pcre.h> cases that I changed to "pcre.h".
266    
267    9.  When pcregrep was used with the --colour option, it missed the line ending
268        sequence off the lines that it output.
269    
270    10. It was pointed out to me that arrays of string pointers cause lots of
271        relocations when a shared library is dynamically loaded. A technique of
272        using a single long string with a table of offsets can drastically reduce
273        these. I have refactored PCRE in four places to do this. The result is
274        dramatic:
275    
276          Originally:                          290
277          After changing UCP table:            187
278          After changing error message table:   43
279          After changing table of "verbs"       36
280          After changing table of Posix names   22
281    
282        Thanks to the folks working on Gregex for glib for this insight.
283    
284    11. --disable-stack-for-recursion caused compiling to fail unless -enable-
285        unicode-properties was also set.
286    
287    12. Updated the tests so that they work when \R is defaulted to ANYCRLF.
288    
289    13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously
290        checked only for CRLF.
291    
292    14. Added casts to pcretest.c to avoid compiler warnings.
293    
294    15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
295    
296    16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
297        and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
298        entirely. This removes changes made in 7 above.
299    
300    17. The CMake files have been updated, and there is now more information about
301        building with CMake in the NON-UNIX-USE document.
302    
303    
304    Version 7.3 28-Aug-07
305    ---------------------
306    
307     1. In the rejigging of the build system that eventually resulted in 7.1, the
308        line "#include <pcre.h>" was included in pcre_internal.h. The use of angle
309        brackets there is not right, since it causes compilers to look for an
310        installed pcre.h, not the version that is in the source that is being
311        compiled (which of course may be different). I have changed it back to:
312    
313          #include "pcre.h"
314    
315        I have a vague recollection that the change was concerned with compiling in
316        different directories, but in the new build system, that is taken care of
317        by the VPATH setting the Makefile.
318    
319     2. The pattern .*$ when run in not-DOTALL UTF-8 mode with newline=any failed
320        when the subject happened to end in the byte 0x85 (e.g. if the last
321        character was \x{1ec5}). *Character* 0x85 is one of the "any" newline
322        characters but of course it shouldn't be taken as a newline when it is part
323        of another character. The bug was that, for an unlimited repeat of . in
324        not-DOTALL UTF-8 mode, PCRE was advancing by bytes rather than by
325        characters when looking for a newline.
326    
327     3. A small performance improvement in the DOTALL UTF-8 mode .* case.
328    
329     4. Debugging: adjusted the names of opcodes for different kinds of parentheses
330        in debug output.
331    
332     5. Arrange to use "%I64d" instead of "%lld" and "%I64u" instead of "%llu" for
333        long printing in the pcrecpp unittest when running under MinGW.
334    
335     6. ESC_K was left out of the EBCDIC table.
336    
337     7. Change 7.0/38 introduced a new limit on the number of nested non-capturing
338        parentheses; I made it 1000, which seemed large enough. Unfortunately, the
339        limit also applies to "virtual nesting" when a pattern is recursive, and in
340        this case 1000 isn't so big. I have been able to remove this limit at the
341        expense of backing off one optimization in certain circumstances. Normally,
342        when pcre_exec() would call its internal match() function recursively and
343        immediately return the result unconditionally, it uses a "tail recursion"
344        feature to save stack. However, when a subpattern that can match an empty
345        string has an unlimited repetition quantifier, it no longer makes this
346        optimization. That gives it a stack frame in which to save the data for
347        checking that an empty string has been matched. Previously this was taken
348        from the 1000-entry workspace that had been reserved. So now there is no
349        explicit limit, but more stack is used.
350    
351     8. Applied Daniel's patches to solve problems with the import/export magic
352        syntax that is required for Windows, and which was going wrong for the
353        pcreposix and pcrecpp parts of the library. These were overlooked when this
354        problem was solved for the main library.
355    
356     9. There were some crude static tests to avoid integer overflow when computing
357        the size of patterns that contain repeated groups with explicit upper
358        limits. As the maximum quantifier is 65535, the maximum group length was
359        set at 30,000 so that the product of these two numbers did not overflow a
360        32-bit integer. However, it turns out that people want to use groups that
361        are longer than 30,000 bytes (though not repeat them that many times).
362        Change 7.0/17 (the refactoring of the way the pattern size is computed) has
363        made it possible to implement the integer overflow checks in a much more
364        dynamic way, which I have now done. The artificial limitation on group
365        length has been removed - we now have only the limit on the total length of
366        the compiled pattern, which depends on the LINK_SIZE setting.
367    
368    10. Fixed a bug in the documentation for get/copy named substring when
369        duplicate names are permitted. If none of the named substrings are set, the
370        functions return PCRE_ERROR_NOSUBSTRING (7); the doc said they returned an
371        empty string.
372    
373    11. Because Perl interprets \Q...\E at a high level, and ignores orphan \E
374        instances, patterns such as [\Q\E] or [\E] or even [^\E] cause an error,
375        because the ] is interpreted as the first data character and the
376        terminating ] is not found. PCRE has been made compatible with Perl in this
377        regard. Previously, it interpreted [\Q\E] as an empty class, and [\E] could
378        cause memory overwriting.
379    
380    10. Like Perl, PCRE automatically breaks an unlimited repeat after an empty
381        string has been matched (to stop an infinite loop). It was not recognizing
382        a conditional subpattern that could match an empty string if that
383        subpattern was within another subpattern. For example, it looped when
384        trying to match  (((?(1)X|))*)  but it was OK with  ((?(1)X|)*)  where the
385        condition was not nested. This bug has been fixed.
386    
387    12. A pattern like \X?\d or \P{L}?\d in non-UTF-8 mode could cause a backtrack
388        past the start of the subject in the presence of bytes with the top bit
389        set, for example "\x8aBCD".
390    
391    13. Added Perl 5.10 experimental backtracking controls (*FAIL), (*F), (*PRUNE),
392        (*SKIP), (*THEN), (*COMMIT), and (*ACCEPT).
393    
394    14. Optimized (?!) to (*FAIL).
395    
396    15. Updated the test for a valid UTF-8 string to conform to the later RFC 3629.
397        This restricts code points to be within the range 0 to 0x10FFFF, excluding
398        the "low surrogate" sequence 0xD800 to 0xDFFF. Previously, PCRE allowed the
399        full range 0 to 0x7FFFFFFF, as defined by RFC 2279. Internally, it still
400        does: it's just the validity check that is more restrictive.
401    
402    16. Inserted checks for integer overflows during escape sequence (backslash)
403        processing, and also fixed erroneous offset values for syntax errors during
404        backslash processing.
405    
406    17. Fixed another case of looking too far back in non-UTF-8 mode (cf 12 above)
407        for patterns like [\PPP\x8a]{1,}\x80 with the subject "A\x80".
408    
409    18. An unterminated class in a pattern like (?1)\c[ with a "forward reference"
410        caused an overrun.
411    
412    19. A pattern like (?:[\PPa*]*){8,} which had an "extended class" (one with
413        something other than just ASCII characters) inside a group that had an
414        unlimited repeat caused a loop at compile time (while checking to see
415        whether the group could match an empty string).
416    
417    20. Debugging a pattern containing \p or \P could cause a crash. For example,
418        [\P{Any}] did so. (Error in the code for printing property names.)
419    
420    21. An orphan \E inside a character class could cause a crash.
421    
422    22. A repeated capturing bracket such as (A)? could cause a wild memory
423        reference during compilation.
424    
425    23. There are several functions in pcre_compile() that scan along a compiled
426        expression for various reasons (e.g. to see if it's fixed length for look
427        behind). There were bugs in these functions when a repeated \p or \P was
428        present in the pattern. These operators have additional parameters compared
429        with \d, etc, and these were not being taken into account when moving along
430        the compiled data. Specifically:
431    
432        (a) A item such as \p{Yi}{3} in a lookbehind was not treated as fixed
433            length.
434    
435        (b) An item such as \pL+ within a repeated group could cause crashes or
436            loops.
437    
438        (c) A pattern such as \p{Yi}+(\P{Yi}+)(?1) could give an incorrect
439            "reference to non-existent subpattern" error.
440    
441        (d) A pattern like (\P{Yi}{2}\277)? could loop at compile time.
442    
443    24. A repeated \S or \W in UTF-8 mode could give wrong answers when multibyte
444        characters were involved (for example /\S{2}/8g with "A\x{a3}BC").
445    
446    25. Using pcregrep in multiline, inverted mode (-Mv) caused it to loop.
447    
448    26. Patterns such as [\P{Yi}A] which include \p or \P and just one other
449        character were causing crashes (broken optimization).
450    
451    27. Patterns such as (\P{Yi}*\277)* (group with possible zero repeat containing
452        \p or \P) caused a compile-time loop.
453    
454    28. More problems have arisen in unanchored patterns when CRLF is a valid line
455        break. For example, the unstudied pattern [\r\n]A does not match the string
456        "\r\nA" because change 7.0/46 below moves the current point on by two
457        characters after failing to match at the start. However, the pattern \nA
458        *does* match, because it doesn't start till \n, and if [\r\n]A is studied,
459        the same is true. There doesn't seem any very clean way out of this, but
460        what I have chosen to do makes the common cases work: PCRE now takes note
461        of whether there can be an explicit match for \r or \n anywhere in the
462        pattern, and if so, 7.0/46 no longer applies. As part of this change,
463        there's a new PCRE_INFO_HASCRORLF option for finding out whether a compiled
464        pattern has explicit CR or LF references.
465    
466    29. Added (*CR) etc for changing newline setting at start of pattern.
467    
468    
469    Version 7.2 19-Jun-07
470    ---------------------
471    
472     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
473        which is apparently normally available under Windows.
474    
475     2. Re-jig the pcregrep tests with different newline settings in an attempt
476        to make them independent of the local environment's newline setting.
477    
478     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
479    
480     4. Some of the "internals" tests were previously cut out when the link size
481        was not 2, because the output contained actual offsets. The recent new
482        "Z" feature of pcretest means that these can be cut out, making the tests
483        usable with all link sizes.
484    
485     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
486        stack recursion. This gives a massive performance boost under BSD, but just
487        a small improvement under Linux. However, it saves one field in the frame
488        in all cases.
489    
490     6. Added more features from the forthcoming Perl 5.10:
491    
492        (a) (?-n) (where n is a string of digits) is a relative subroutine or
493            recursion call. It refers to the nth most recently opened parentheses.
494    
495        (b) (?+n) is also a relative subroutine call; it refers to the nth next
496            to be opened parentheses.
497    
498        (c) Conditions that refer to capturing parentheses can be specified
499            relatively, for example, (?(-2)... or (?(+3)...
500    
501        (d) \K resets the start of the current match so that everything before
502            is not part of it.
503    
504        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
505    
506        (f) \g{name} is another synonym - part of Perl 5.10's unification of
507            reference syntax.
508    
509        (g) (?| introduces a group in which the numbering of parentheses in each
510            alternative starts with the same number.
511    
512        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
513    
514     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
515        PCRE_INFO_JCHANGED.
516    
517     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
518        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
519        for detecting groups that can match an empty string.
520    
521     9. A pattern with a very large number of alternatives (more than several
522        hundred) was running out of internal workspace during the pre-compile
523        phase, where pcre_compile() figures out how much memory will be needed. A
524        bit of new cunning has reduced the workspace needed for groups with
525        alternatives. The 1000-alternative test pattern now uses 12 bytes of
526        workspace instead of running out of the 4096 that are available.
527    
528    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
529    
530    11. Applied patch from Google to remove an optimization that didn't quite work.
531        The report of the bug said:
532    
533          pcrecpp::RE("a*").FullMatch("aaa") matches, while
534          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
535          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
536    
537    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
538        it matched the wrong number of bytes.
539    
540    
541    Version 7.1 24-Apr-07
542    ---------------------
543    
544     1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
545        that is more "standard", making use of automake and other Autotools. There
546        is some re-arrangement of the files and adjustment of comments consequent
547        on this.
548    
549     2. Part of the patch fixed a problem with the pcregrep tests. The test of -r
550        for recursive directory scanning broke on some systems because the files
551        are not scanned in any specific order and on different systems the order
552        was different. A call to "sort" has been inserted into RunGrepTest for the
553        approprate test as a short-term fix. In the longer term there may be an
554        alternative.
555    
556     3. I had an email from Eric Raymond about problems translating some of PCRE's
557        man pages to HTML (despite the fact that I distribute HTML pages, some
558        people do their own conversions for various reasons). The problems
559        concerned the use of low-level troff macros .br and .in. I have therefore
560        removed all such uses from the man pages (some were redundant, some could
561        be replaced by .nf/.fi pairs). The 132html script that I use to generate
562        HTML has been updated to handle .nf/.fi and to complain if it encounters
563        .br or .in.
564    
565     4. Updated comments in configure.ac that get placed in config.h.in and also
566        arranged for config.h to be included in the distribution, with the name
567        config.h.generic, for the benefit of those who have to compile without
568        Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
569    
570     5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan
571        Weber: (1) pcre_internal.h was missing some function renames; (2) updated
572        makevp.bat for the current PCRE, using the additional files
573        makevp_c.txt, makevp_l.txt, and pcregexp.pas.
574    
575     6. A Windows user reported a minor discrepancy with test 2, which turned out
576        to be caused by a trailing space on an input line that had got lost in his
577        copy. The trailing space was an accident, so I've just removed it.
578    
579     7. Add -Wl,-R... flags in pcre-config.in for *BSD* systems, as I'm told
580        that is needed.
581    
582     8. Mark ucp_table (in ucptable.h) and ucp_gentype (in pcre_ucp_searchfuncs.c)
583        as "const" (a) because they are and (b) because it helps the PHP
584        maintainers who have recently made a script to detect big data structures
585        in the php code that should be moved to the .rodata section. I remembered
586        to update Builducptable as well, so it won't revert if ucptable.h is ever
587        re-created.
588    
589     9. Added some extra #ifdef SUPPORT_UTF8 conditionals into pcretest.c,
590        pcre_printint.src, pcre_compile.c, pcre_study.c, and pcre_tables.c, in
591        order to be able to cut out the UTF-8 tables in the latter when UTF-8
592        support is not required. This saves 1.5-2K of code, which is important in
593        some applications.
594    
595        Later: more #ifdefs are needed in pcre_ord2utf8.c and pcre_valid_utf8.c
596        so as not to refer to the tables, even though these functions will never be
597        called when UTF-8 support is disabled. Otherwise there are problems with a
598        shared library.
599    
600    10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:
601    
602        (a) It was defining its arguments as char * instead of void *.
603    
604        (b) It was assuming that all moves were upwards in memory; this was true
605            a long time ago when I wrote it, but is no longer the case.
606    
607        The emulated memove() is provided for those environments that have neither
608        memmove() nor bcopy(). I didn't think anyone used it these days, but that
609        is clearly not the case, as these two bugs were recently reported.
610    
611    11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
612        and Detrail to create the HTML documentation, the .txt form of the man
613        pages, and it removes trailing spaces from listed files. It also creates
614        pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter
615        case, it wraps all the #defines with #ifndefs. This script should be run
616        before "make dist".
617    
618    12. Fixed two fairly obscure bugs concerned with quantified caseless matching
619        with Unicode property support.
620    
621        (a) For a maximizing quantifier, if the two different cases of the
622            character were of different lengths in their UTF-8 codings (there are
623            some cases like this - I found 11), and the matching function had to
624            back up over a mixture of the two cases, it incorrectly assumed they
625            were both the same length.
626    
627        (b) When PCRE was configured to use the heap rather than the stack for
628            recursion during matching, it was not correctly preserving the data for
629            the other case of a UTF-8 character when checking ahead for a match
630            while processing a minimizing repeat. If the check also involved
631            matching a wide character, but failed, corruption could cause an
632            erroneous result when trying to check for a repeat of the original
633            character.
634    
635    13. Some tidying changes to the testing mechanism:
636    
637        (a) The RunTest script now detects the internal link size and whether there
638            is UTF-8 and UCP support by running ./pcretest -C instead of relying on
639            values substituted by "configure". (The RunGrepTest script already did
640            this for UTF-8.) The configure.ac script no longer substitutes the
641            relevant variables.
642    
643        (b) The debugging options /B and /D in pcretest show the compiled bytecode
644            with length and offset values. This means that the output is different
645            for different internal link sizes. Test 2 is skipped for link sizes
646            other than 2 because of this, bypassing the problem. Unfortunately,
647            there was also a test in test 3 (the locale tests) that used /B and
648            failed for link sizes other than 2. Rather than cut the whole test out,
649            I have added a new /Z option to pcretest that replaces the length and
650            offset values with spaces. This is now used to make test 3 independent
651            of link size. (Test 2 will be tidied up later.)
652    
653    14. If erroroffset was passed as NULL to pcre_compile, it provoked a
654        segmentation fault instead of returning the appropriate error message.
655    
656    15. In multiline mode when the newline sequence was set to "any", the pattern
657        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
658        This doesn't seem right; it now treats the CRLF combination as the line
659        ending, and so does not match in that case. It's only a pattern such as ^$
660        that would hit this one: something like ^ABC$ would have failed after \r
661        and then tried again after \r\n.
662    
663    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
664        in an attempt to make files that differ only in their line terminators
665        compare equal. This works on Linux.
666    
667    17. Under certain error circumstances pcregrep might try to free random memory
668        as it exited. This is now fixed, thanks to valgrind.
669    
670    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
671        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
672        was because its rules for how to advance for /g after matching an empty
673        string at the end of a line did not allow for this case. They now check for
674        it specially.
675    
676    20. pcretest is supposed to handle patterns and data of any length, by
677        extending its buffers when necessary. It was getting this wrong when the
678        buffer for a data line had to be extended.
679    
680    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
681        CRLF as a newline sequence.
682    
683    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
684        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
685        I have nevertheless tidied it up.
686    
687    23. Added some casts to kill warnings from HP-UX ia64 compiler.
688    
689    24. Added a man page for pcre-config.
690    
691    
692  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06
693  ---------------------  ---------------------

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