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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 8.10 03 May-2010  Version 8.32
5    ------------
7    1.  Improved JIT compiler optimizations for first character search and single
8        character iterators.
10    2.  Supporting IBM XL C compilers for PPC architectures in the JIT compiler.
11        Patch by Daniel Richard G.
13    3.  Single character iterator optimizations in the JIT compiler.
15    4.  Improved JIT compiler optimizations for character ranges.
17    5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
18        Reported by Giuseppe D'Angelo.
20    6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
21        of a line, was being set incorrectly in cases where .* appeared inside
22        atomic brackets at the start of a pattern, or where there was a subsequent
23        *PRUNE or *SKIP.
25    7.  Improved instruction cache flush for POWER/PowerPC.
26        Patch by Daniel Richard G.
28    8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
29        grep:
31        (a) There is now no limit to the number of patterns to be matched.
33        (b) An error is given if a pattern is too long.
35        (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
36            are now supported.
38        (d) --exclude-from and --include-from (multiple use) have been added.
40        (e) Exclusions and inclusions now apply to all files and directories, not
41            just to those obtained from scanning a directory recursively.
43        (f) Multiple uses of -f and --file-list are now supported.
45        (g) In a Windows environment, the default for -d has been changed from
46            "read" (the GNU grep default) to "skip", because otherwise the presence
47            of a directory in the file list provokes an error.
49        (h) The documentation has been revised and clarified in places.
51    9.  Improve the matching speed of capturing brackets.
53    10. Changed the meaning of \X so that it now matches a Unicode extended
54        grapheme cluster.
56    11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
57        out POSIX threads when JIT support is configured.
59    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
61    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
62        structure could go wrong in environments where size_t is not the same size
63        as int.
65    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
66        set.
70    Version 8.31 06-July-2012
71    -------------------------
73    1.  Fixing a wrong JIT test case and some compiler warnings.
75    2.  Removed a bashism from the RunTest script.
77    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
78        to unsigned type, result still unsigned" that was given by an MS compiler
79        on encountering the code "-sizeof(xxx)".
81    4.  Partial matching support is added to the JIT compiler.
83    5.  Fixed several bugs concerned with partial matching of items that consist
84        of more than one character:
86        (a) /^(..)\1/ did not partially match "aba" because checking references was
87            done on an "all or nothing" basis. This also applied to repeated
88            references.
90        (b) \R did not give a hard partial match if \r was found at the end of the
91            subject.
93        (c) \X did not give a hard partial match after matching one or more
94            characters at the end of the subject.
96        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
97            a partial match for the string "\r".
99        (e) When newline was set to CRLF, the metacharacter "." did not recognize
100            a partial match for a CR character at the end of the subject string.
102    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
103        running pcretest, the text "(JIT)" added to the output whenever JIT is
104        actually used to run the match.
106    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
107        or /S+[+] with a digit between 1 and 7.
109    8.  OP_NOT now supports any UTF character not just single-byte ones.
111    9.  (*MARK) control verb is now supported by the JIT compiler.
113    10. The command "./RunTest list" lists the available tests without actually
114        running any of them. (Because I keep forgetting what they all are.)
118    12. Applied a (slightly modified) user-supplied patch that improves performance
119        when the heap is used for recursion (compiled with --disable-stack-for-
120        recursion). Instead of malloc and free for each heap frame each time a
121        logical recursion happens, frames are retained on a chain and re-used where
122        possible. This sometimes gives as much as 30% improvement.
124    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
125        call.
127    14. As documented, (*COMMIT) is now confined to within a positive assertion.
129    15. It is now possible to link pcretest with libedit as an alternative to
130        libreadline.
132    16. (*COMMIT) control verb is now supported by the JIT compiler.
134    17. The Unicode data tables have been updated to Unicode 6.1.0.
136    18. Added --file-list option to pcregrep.
138    19. Added binary file support to pcregrep, including the -a, --binary-files,
139        -I, and --text options.
141    20. The madvise function is renamed for posix_madvise for QNX compatibility
142        reasons. Fixed by Giuseppe D'Angelo.
144    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
146    22. Changed the option for creating symbolic links for 16-bit man pages from
147        -s to -sf so that re-installing does not cause issues.
149    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
151    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
152        matches in certain environments (the workspace was not being correctly
153        retained). Also added to pcre_dfa_exec() a simple plausibility check on
154        some of the workspace data at the beginning of a restart.
156    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
157        was not doing so when it should - probably a typo introduced by SVN 528
158        (change 8.10/14).
160    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
161        \w+ when the character tables indicated that \x{c4} was a word character.
162        There were several related cases, all because the tests for doing a table
163        lookup were testing for characters less than 127 instead of 255.
165    27. If a pattern contains capturing parentheses that are not used in a match,
166        their slots in the ovector are set to -1. For those that are higher than
167        any matched groups, this happens at the end of processing. In the case when
168        there were back references that the ovector was too small to contain
169        (causing temporary malloc'd memory to be used during matching), and the
170        highest capturing number was not used, memory off the end of the ovector
171        was incorrectly being set to -1. (It was using the size of the temporary
172        memory instead of the true size.)
174    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
175        ovector size, it uses memory at the end of the block that it has got.
177    29. Check for an overlong MARK name and give an error at compile time. The
178        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
180    30. JIT compiler update.
182    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
183        Rill for the patch.
185    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
187    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
189    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
190        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
191        was enabled.
193    35. Improve JIT code generation for greedy plus quantifier.
195    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
196        1 to "aa" instead of to an empty string. The bug affected repeated groups
197        that could potentially match an empty string.
199    37. Optimizing single character iterators in JIT.
201    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
202        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
203        codepoints that are too big for the mode are faulted, and in a UTF mode,
204        disallowed codepoints are also faulted.
206    39. If PCRE was compiled with UTF support, in three places in the DFA
207        matcher there was code that should only have been obeyed in UTF mode, but
208        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
209        processing when bytes with values greater than 127 were present. In 16-bit
210        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
211        both cases the values are those that cannot be the first data item in a UTF
212        character. The three items that might have provoked this were recursions,
213        possessively repeated groups, and atomic groups.
215    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
216        and pcregrep, because some OS require shared objects to be explicitly
217        passed to ld, causing the link step to fail if they are not.
219    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
220        mode, patterns that started with \h* or \R* might be incorrectly matched.
223    Version 8.30 04-February-2012
224    -----------------------------
226    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
227        name is defined in ctype.h.
229    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
230        only in quite long subpatterns.
232    3.  Removed the function pcre_info(), which has been obsolete and deprecated
233        since it was replaced by pcre_fullinfo() in February 2000.
235    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
236        match a (*MARK), and the match failed at the start of the subject, a
237        reference to memory before the start of the subject could occur. This bug
238        was introduced by fix 17 of release 8.21.
240    5.  A reference to an unset group with zero minimum repetition was giving
241        totally wrong answers (in non-JavaScript-compatibility mode). For example,
242        /(another)?(\1?)test/ matched against "hello world test". This bug was
243        introduced in release 8.13.
245    6.  Add support for 16-bit character strings (a large amount of work involving
246        many changes and refactorings).
248    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
249        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
250        from a file.
252    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
253        rounding is not applied in this particular case).
255    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
256        if they appear, or are escaped, in patterns.
258    10. Get rid of a number of -Wunused-but-set-variable warnings.
260    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
261        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
262        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
263        also returns the mark "x". This bug applied to capturing parentheses,
264        non-capturing parentheses, and atomic parentheses. It also applied to some
265        assertions.
267    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
268        information out of configure.ac instead of relying on pcre.h.generic, which
269        is not stored in the repository.
271    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
272        -lreadline.
274    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
276    15. Applied Graycode's patch to put the top-level frame on the stack rather
277        than the heap when not using the stack for recursion. This gives a
278        performance improvement in many cases when recursion is not deep.
280    16. Experimental code added to "pcretest -C" to output the stack frame size.
283    Version 8.21 12-Dec-2011
284    ------------------------
286    1.  Updating the JIT compiler.
288    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
289        are added as well.
291    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
292        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
293        calling _pcre_jit_exec. Some extra comments are added.
295    4.  (*MARK) settings inside atomic groups that do not contain any capturing
296        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
297        was introduced by change 18 for 8.20.
299    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
300        ECMA-262 standard.
302    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
303        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
304        This bug was probably introduced by change 9 of 8.13.
306    7.  While fixing 6 above, I noticed that a number of other items were being
307        incorrectly rejected as "not fixed length". This arose partly because newer
308        opcodes had not been added to the fixed-length checking code. I have (a)
309        corrected the bug and added tests for these items, and (b) arranged for an
310        error to occur if an unknown opcode is encountered while checking for fixed
311        length instead of just assuming "not fixed length". The items that were
312        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
313        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
314        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
316    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
317        being incorrectly compiled and would have given unpredicatble results.
319    9.  A possessively repeated subpattern with minimum repeat count greater than
320        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
321        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
322        the first (A) could occur when it should not.
324    10. Add a cast and remove a redundant test from the code.
326    11. JIT should use pcre_malloc/pcre_free for allocation.
328    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
329        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
330        is anything other than /usr, -L is still shown).
332    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
334    14. Perl does not support \N without a following name in a [] class; PCRE now
335        also gives an error.
337    15. If a forward reference was repeated with an upper limit of around 2000,
338        it caused the error "internal error: overran compiling workspace". The
339        maximum number of forward references (including repeats) was limited by the
340        internal workspace, and dependent on the LINK_SIZE. The code has been
341        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
342        the default depends on LINK_SIZE. There is a new upper limit (for safety)
343        of around 200,000 forward references. While doing this, I also speeded up
344        the filling in of repeated forward references.
346    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
347        incorrectly expecting the subject to contain another "a" after the start.
349    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
350        in the match, the SKIP should be ignored. This was not happening; instead
351        the SKIP was being treated as NOMATCH. For patterns such as
352        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
353        tested.
355    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
356        now much more compatible with Perl, in particular in cases where the result
357        is a non-match for a non-anchored pattern. For example, if
358        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
359        "m", where previously it did not return a name. A side effect of this
360        change is that for partial matches, the last encountered mark name is
361        returned, as for non matches. A number of tests that were previously not
362        Perl-compatible have been moved into the Perl-compatible test files. The
363        refactoring has had the pleasing side effect of removing one argument from
364        the match() function, thus reducing its stack requirements.
366    19. If the /S+ option was used in pcretest to study a pattern using JIT,
367        subsequent uses of /S (without +) incorrectly behaved like /S+.
369    21. Retrieve executable code size support for the JIT compiler and fixing
370        some warnings.
372    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
373        not work when the shorter character appeared right at the end of the
374        subject string.
376    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
377        systems.
379    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
380        output it when the /M option is used in pcretest.
382    25. The CheckMan script was not being included in the distribution. Also, added
383        an explicit "perl" to run Perl scripts from the PrepareRelease script
384        because this is reportedly needed in Windows.
386    26. If study data was being save in a file and studying had not found a set of
387        "starts with" bytes for the pattern, the data written to the file (though
388        never used) was taken from uninitialized memory and so caused valgrind to
389        complain.
391    27. Updated RunTest.bat as provided by Sheri Pierce.
393    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
395    29. Computation of memory usage for the table of capturing group names was
396        giving an unnecessarily large value.
399    Version 8.20 21-Oct-2011
400    ------------------------
402    1.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had
403        a POSIX class. After further experiments with Perl, which convinced me that
404        Perl has bugs and confusions, a closing square bracket is no longer allowed
405        in a POSIX name. This bug also affected patterns with classes that started
406        with full stops.
408    2.  If a pattern such as /(a)b|ac/ is matched against "ac", there is no
409        captured substring, but while checking the failing first alternative,
410        substring 1 is temporarily captured. If the output vector supplied to
411        pcre_exec() was not big enough for this capture, the yield of the function
412        was still zero ("insufficient space for captured substrings"). This cannot
413        be totally fixed without adding another stack variable, which seems a lot
414        of expense for a edge case. However, I have improved the situation in cases
415        such as /(a)(b)x|abc/ matched against "abc", where the return code
416        indicates that fewer than the maximum number of slots in the ovector have
417        been set.
419    3.  Related to (2) above: when there are more back references in a pattern than
420        slots in the output vector, pcre_exec() uses temporary memory during
421        matching, and copies in the captures as far as possible afterwards. It was
422        using the entire output vector, but this conflicts with the specification
423        that only 2/3 is used for passing back captured substrings. Now it uses
424        only the first 2/3, for compatibility. This is, of course, another edge
425        case.
427    4.  Zoltan Herczeg's just-in-time compiler support has been integrated into the
428        main code base, and can be used by building with --enable-jit. When this is
429        done, pcregrep automatically uses it unless --disable-pcregrep-jit or the
430        runtime --no-jit option is given.
432    5.  When the number of matches in a pcre_dfa_exec() run exactly filled the
433        ovector, the return from the function was zero, implying that there were
434        other matches that did not fit. The correct "exactly full" value is now
435        returned.
437    6.  If a subpattern that was called recursively or as a subroutine contained
438        (*PRUNE) or any other control that caused it to give a non-standard return,
439        invalid errors such as "Error -26 (nested recursion at the same subject
440        position)" or even infinite loops could occur.
442    7.  If a pattern such as /a(*SKIP)c|b(*ACCEPT)|/ was studied, it stopped
443        computing the minimum length on reaching *ACCEPT, and so ended up with the
444        wrong value of 1 rather than 0. Further investigation indicates that
445        computing a minimum subject length in the presence of *ACCEPT is difficult
446        (think back references, subroutine calls), and so I have changed the code
447        so that no minimum is registered for a pattern that contains *ACCEPT.
449    8.  If (*THEN) was present in the first (true) branch of a conditional group,
450        it was not handled as intended. [But see 16 below.]
452    9.  Replaced RunTest.bat and CMakeLists.txt with improved versions provided by
453        Sheri Pierce.
455    10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that
456        the first byte in a match must be "a".
458    11. Change 17 for 8.13 increased the recursion depth for patterns like
459        /a(?:.)*?a/ drastically. I've improved things by remembering whether a
460        pattern contains any instances of (*THEN). If it does not, the old
461        optimizations are restored. It would be nice to do this on a per-group
462        basis, but at the moment that is not feasible.
464    12. In some environments, the output of pcretest -C is CRLF terminated. This
465        broke RunTest's code that checks for the link size. A single white space
466        character after the value is now allowed for.
468    13. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".
469        For "fr", it uses the Windows-specific input and output files.
471    14. If (*THEN) appeared in a group that was called recursively or as a
472        subroutine, it did not work as intended. [But see next item.]
474    15. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex
475        pattern fragments (but not containing any | characters). If A and B are
476        matched, but there is a failure in C so that it backtracks to (*THEN), PCRE
477        was behaving differently to Perl. PCRE backtracked into A, but Perl goes to
478        D. In other words, Perl considers parentheses that do not contain any |
479        characters to be part of a surrounding alternative, whereas PCRE was
480        treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles
481        differently. PCRE now behaves in the same way as Perl, except in the case
482        of subroutine/recursion calls such as (?1) which have in any case always
483        been different (but PCRE had them first :-).
485    16. Related to 15 above: Perl does not treat the | in a conditional group as
486        creating alternatives. Such a group is treated in the same way as an
487        ordinary group without any | characters when processing (*THEN). PCRE has
488        been changed to match Perl's behaviour.
490    17. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the
491        RunGrepTest script failed.
493    18. Change 22 for version 13 caused atomic groups to use more stack. This is
494        inevitable for groups that contain captures, but it can lead to a lot of
495        stack use in large patterns. The old behaviour has been restored for atomic
496        groups that do not contain any capturing parentheses.
498    19. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not
499        suppress the check for a minimum subject length at run time. (If it was
500        given to pcre_exec() or pcre_dfa_exec() it did work.)
502    20. Fixed an ASCII-dependent infelicity in pcretest that would have made it
503        fail to work when decoding hex characters in data strings in EBCDIC
504        environments.
506    21. It appears that in at least one Mac OS environment, the isxdigit() function
507        is implemented as a macro that evaluates to its argument more than once,
508        contravening the C 90 Standard (I haven't checked a later standard). There
509        was an instance in pcretest which caused it to go wrong when processing
510        \x{...} escapes in subject strings. The has been rewritten to avoid using
511        things like p++ in the argument of isxdigit().
514    Version 8.13 16-Aug-2011
515    ------------------------
517    1.  The Unicode data tables have been updated to Unicode 6.0.0.
519    2.  Two minor typos in pcre_internal.h have been fixed.
521    3.  Added #include <string.h> to pcre_scanner_unittest.cc, pcrecpp.cc, and
522        pcrecpp_unittest.cc. They are needed for strcmp(), memset(), and strchr()
523        in some environments (e.g. Solaris 10/SPARC using Sun Studio 12U2).
525    4.  There were a number of related bugs in the code for matching backrefences
526        caselessly in UTF-8 mode when codes for the characters concerned were
527        different numbers of bytes. For example, U+023A and U+2C65 are an upper
528        and lower case pair, using 2 and 3 bytes, respectively. The main bugs were:
529        (a) A reference to 3 copies of a 2-byte code matched only 2 of a 3-byte
530        code. (b) A reference to 2 copies of a 3-byte code would not match 2 of a
531        2-byte code at the end of the subject (it thought there wasn't enough data
532        left).
534    5.  Comprehensive information about what went wrong is now returned by
535        pcre_exec() and pcre_dfa_exec() when the UTF-8 string check fails, as long
536        as the output vector has at least 2 elements. The offset of the start of
537        the failing character and a reason code are placed in the vector.
539    6.  When the UTF-8 string check fails for pcre_compile(), the offset that is
540        now returned is for the first byte of the failing character, instead of the
541        last byte inspected. This is an incompatible change, but I hope it is small
542        enough not to be a problem. It makes the returned offset consistent with
543        pcre_exec() and pcre_dfa_exec().
545    7.  pcretest now gives a text phrase as well as the error number when
546        pcre_exec() or pcre_dfa_exec() fails; if the error is a UTF-8 check
547        failure, the offset and reason code are output.
549    8.  When \R was used with a maximizing quantifier it failed to skip backwards
550        over a \r\n pair if the subsequent match failed. Instead, it just skipped
551        back over a single character (\n). This seems wrong (because it treated the
552        two characters as a single entity when going forwards), conflicts with the
553        documentation that \R is equivalent to (?>\r\n|\n|...etc), and makes the
554        behaviour of \R* different to (\R)*, which also seems wrong. The behaviour
555        has been changed.
557    9.  Some internal refactoring has changed the processing so that the handling
558        of the PCRE_CASELESS and PCRE_MULTILINE options is done entirely at compile
559        time (the PCRE_DOTALL option was changed this way some time ago: version
560        7.7 change 16). This has made it possible to abolish the OP_OPT op code,
561        which was always a bit of a fudge. It also means that there is one less
562        argument for the match() function, which reduces its stack requirements
563        slightly. This change also fixes an incompatibility with Perl: the pattern
564        (?i:([^b]))(?1) should not match "ab", but previously PCRE gave a match.
566    10. More internal refactoring has drastically reduced the number of recursive
567        calls to match() for possessively repeated groups such as (abc)++ when
568        using pcre_exec().
570    11. While implementing 10, a number of bugs in the handling of groups were
571        discovered and fixed:
573        (?<=(a)+) was not diagnosed as invalid (non-fixed-length lookbehind).
574        (a|)*(?1) gave a compile-time internal error.
575        ((a|)+)+  did not notice that the outer group could match an empty string.
576        (^a|^)+   was not marked as anchored.
577        (.*a|.*)+ was not marked as matching at start or after a newline.
579    12. Yet more internal refactoring has removed another argument from the match()
580        function. Special calls to this function are now indicated by setting a
581        value in a variable in the "match data" data block.
583    13. Be more explicit in pcre_study() instead of relying on "default" for
584        opcodes that mean there is no starting character; this means that when new
585        ones are added and accidentally left out of pcre_study(), testing should
586        pick them up.
588    14. The -s option of pcretest has been documented for ages as being an old
589        synonym of -m (show memory usage). I have changed it to mean "force study
590        for every regex", that is, assume /S for every regex. This is similar to -i
591        and -d etc. It's slightly incompatible, but I'm hoping nobody is still
592        using it. It makes it easier to run collections of tests with and without
593        study enabled, and thereby test pcre_study() more easily. All the standard
594        tests are now run with and without -s (but some patterns can be marked as
595        "never study" - see 20 below).
597    15. When (*ACCEPT) was used in a subpattern that was called recursively, the
598        restoration of the capturing data to the outer values was not happening
599        correctly.
601    16. If a recursively called subpattern ended with (*ACCEPT) and matched an
602        empty string, and PCRE_NOTEMPTY was set, pcre_exec() thought the whole
603        pattern had matched an empty string, and so incorrectly returned a no
604        match.
606    17. There was optimizing code for the last branch of non-capturing parentheses,
607        and also for the obeyed branch of a conditional subexpression, which used
608        tail recursion to cut down on stack usage. Unfortunately, now that there is
609        the possibility of (*THEN) occurring in these branches, tail recursion is
610        no longer possible because the return has to be checked for (*THEN). These
611        two optimizations have therefore been removed. [But see 8.20/11 above.]
613    18. If a pattern containing \R was studied, it was assumed that \R always
614        matched two bytes, thus causing the minimum subject length to be
615        incorrectly computed because \R can also match just one byte.
617    19. If a pattern containing (*ACCEPT) was studied, the minimum subject length
618        was incorrectly computed.
620    20. If /S is present twice on a test pattern in pcretest input, it now
621        *disables* studying, thereby overriding the use of -s on the command line
622        (see 14 above). This is necessary for one or two tests to keep the output
623        identical in both cases.
625    21. When (*ACCEPT) was used in an assertion that matched an empty string and
626        PCRE_NOTEMPTY was set, PCRE applied the non-empty test to the assertion.
628    22. When an atomic group that contained a capturing parenthesis was
629        successfully matched, but the branch in which it appeared failed, the
630        capturing was not being forgotten if a higher numbered group was later
631        captured. For example, /(?>(a))b|(a)c/ when matching "ac" set capturing
632        group 1 to "a", when in fact it should be unset. This applied to multi-
633        branched capturing and non-capturing groups, repeated or not, and also to
634        positive assertions (capturing in negative assertions does not happen
635        in PCRE) and also to nested atomic groups.
637    23. Add the ++ qualifier feature to pcretest, to show the remainder of the
638        subject after a captured substring, to make it easier to tell which of a
639        number of identical substrings has been captured.
641    24. The way atomic groups are processed by pcre_exec() has been changed so that
642        if they are repeated, backtracking one repetition now resets captured
643        values correctly. For example, if ((?>(a+)b)+aabab) is matched against
644        "aaaabaaabaabab" the value of captured group 2 is now correctly recorded as
645        "aaa". Previously, it would have been "a". As part of this code
646        refactoring, the way recursive calls are handled has also been changed.
648    25. If an assertion condition captured any substrings, they were not passed
649        back unless some other capturing happened later. For example, if
650        (?(?=(a))a) was matched against "a", no capturing was returned.
652    26. When studying a pattern that contained subroutine calls or assertions,
653        the code for finding the minimum length of a possible match was handling
654        direct recursions such as (xxx(?1)|yyy) but not mutual recursions (where
655        group 1 called group 2 while simultaneously a separate group 2 called group
656        1). A stack overflow occurred in this case. I have fixed this by limiting
657        the recursion depth to 10.
659    27. Updated RunTest.bat in the distribution to the version supplied by Tom
660        Fortmann. This supports explicit test numbers on the command line, and has
661        argument validation and error reporting.
663    28. An instance of \X with an unlimited repeat could fail if at any point the
664        first character it looked at was a mark character.
666    29. Some minor code refactoring concerning Unicode properties and scripts
667        should reduce the stack requirement of match() slightly.
669    30. Added the '=' option to pcretest to check the setting of unused capturing
670        slots at the end of the pattern, which are documented as being -1, but are
671        not included in the return count.
673    31. If \k was not followed by a braced, angle-bracketed, or quoted name, PCRE
674        compiled something random. Now it gives a compile-time error (as does
675        Perl).
677    32. A *MARK encountered during the processing of a positive assertion is now
678        recorded and passed back (compatible with Perl).
680    33. If --only-matching or --colour was set on a pcregrep call whose pattern
681        had alternative anchored branches, the search for a second match in a line
682        was done as if at the line start. Thus, for example, /^01|^02/ incorrectly
683        matched the line "0102" twice. The same bug affected patterns that started
684        with a backwards assertion. For example /\b01|\b02/ also matched "0102"
685        twice.
687    34. Previously, PCRE did not allow quantification of assertions. However, Perl
688        does, and because of capturing effects, quantifying parenthesized
689        assertions may at times be useful. Quantifiers are now allowed for
690        parenthesized assertions.
692    35. A minor code tidy in pcre_compile() when checking options for \R usage.
694    36. \g was being checked for fancy things in a character class, when it should
695        just be a literal "g".
697    37. PCRE was rejecting [:a[:digit:]] whereas Perl was not. It seems that the
698        appearance of a nested POSIX class supersedes an apparent external class.
699        For example, [:a[:digit:]b:] matches "a", "b", ":", or a digit. Also,
700        unescaped square brackets may also appear as part of class names. For
701        example, [:a[:abc]b:] gives unknown class "[:abc]b:]". PCRE now behaves
702        more like Perl. (But see 8.20/1 above.)
704    38. PCRE was giving an error for \N with a braced quantifier such as {1,} (this
705        was because it thought it was \N{name}, which is not supported).
707    39. Add minix to OS list not supporting the -S option in pcretest.
709    40. PCRE tries to detect cases of infinite recursion at compile time, but it
710        cannot analyze patterns in sufficient detail to catch mutual recursions
711        such as ((?1))((?2)). There is now a runtime test that gives an error if a
712        subgroup is called recursively as a subpattern for a second time at the
713        same position in the subject string. In previous releases this might have
714        been caught by the recursion limit, or it might have run out of stack.
716    41. A pattern such as /(?(R)a+|(?R)b)/ is quite safe, as the recursion can
717        happen only once. PCRE was, however incorrectly giving a compile time error
718        "recursive call could loop indefinitely" because it cannot analyze the
719        pattern in sufficient detail. The compile time test no longer happens when
720        PCRE is compiling a conditional subpattern, but actual runaway loops are
721        now caught at runtime (see 40 above).
723    42. It seems that Perl allows any characters other than a closing parenthesis
724        to be part of the NAME in (*MARK:NAME) and other backtracking verbs. PCRE
725        has been changed to be the same.
727    43. Updated configure.ac to put in more quoting round AC_LANG_PROGRAM etc. so
728        as not to get warnings when autogen.sh is called. Also changed
729        AC_PROG_LIBTOOL (deprecated) to LT_INIT (the current macro).
731    44. To help people who use pcregrep to scan files containing exceedingly long
732        lines, the following changes have been made:
734        (a) The default value of the buffer size parameter has been increased from
735            8K to 20K. (The actual buffer used is three times this size.)
737        (b) The default can be changed by ./configure --with-pcregrep-bufsize when
738            PCRE is built.
740        (c) A --buffer-size=n option has been added to pcregrep, to allow the size
741            to be set at run time.
743        (d) Numerical values in pcregrep options can be followed by K or M, for
744            example --buffer-size=50K.
746        (e) If a line being scanned overflows pcregrep's buffer, an error is now
747            given and the return code is set to 2.
749    45. Add a pointer to the latest mark to the callout data block.
751    46. The pattern /.(*F)/, when applied to "abc" with PCRE_PARTIAL_HARD, gave a
752        partial match of an empty string instead of no match. This was specific to
753        the use of ".".
755    47. The pattern /f.*/8s, when applied to "for" with PCRE_PARTIAL_HARD, gave a
756        complete match instead of a partial match. This bug was dependent on both
757        the PCRE_UTF8 and PCRE_DOTALL options being set.
759    48. For a pattern such as /\babc|\bdef/ pcre_study() was failing to set up the
760        starting byte set, because \b was not being ignored.
763    Version 8.12 15-Jan-2011
764    ------------------------
766    1.  Fixed some typos in the markup of the man pages, and wrote a script that
767        checks for such things as part of the documentation building process.
769    2.  On a big-endian 64-bit system, pcregrep did not correctly process the
770        --match-limit and --recursion-limit options (added for 8.11). In
771        particular, this made one of the standard tests fail. (The integer value
772        went into the wrong half of a long int.)
774    3.  If the --colour option was given to pcregrep with -v (invert match), it
775        did strange things, either producing crazy output, or crashing. It should,
776        of course, ignore a request for colour when reporting lines that do not
777        match.
779    4.  Another pcregrep bug caused similar problems if --colour was specified with
780        -M (multiline) and the pattern match finished with a line ending.
782    5.  In pcregrep, when a pattern that ended with a literal newline sequence was
783        matched in multiline mode, the following line was shown as part of the
784        match. This seems wrong, so I have changed it.
786    6.  Another pcregrep bug in multiline mode, when --colour was specified, caused
787        the check for further matches in the same line (so they could be coloured)
788        to overrun the end of the current line. If another match was found, it was
789        incorrectly shown (and then shown again when found in the next line).
791    7.  If pcregrep was compiled under Windows, there was a reference to the
792        function pcregrep_exit() before it was defined. I am assuming this was
793        the cause of the "error C2371: 'pcregrep_exit' : redefinition;" that was
794        reported by a user. I've moved the definition above the reference.
797    Version 8.11 10-Dec-2010
798    ------------------------
800    1.  (*THEN) was not working properly if there were untried alternatives prior
801        to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
802        backtracked to try for "b" instead of moving to the next alternative branch
803        at the same level (in this case, to look for "c"). The Perl documentation
804        is clear that when (*THEN) is backtracked onto, it goes to the "next
805        alternative in the innermost enclosing group".
807    2.  (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
808        such as   (A(*COMMIT)B(*THEN)C|D)  any failure after matching A should
809        result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
810        (*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
811        (*THEN).
813    3.  If \s appeared in a character class, it removed the VT character from
814        the class, even if it had been included by some previous item, for example
815        in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
816        of \s, but is part of the POSIX "space" class.)
818    4.  A partial match never returns an empty string (because you can always
819        match an empty string at the end of the subject); however the checking for
820        an empty string was starting at the "start of match" point. This has been
821        changed to the "earliest inspected character" point, because the returned
822        data for a partial match starts at this character. This means that, for
823        example, /(?<=abc)def/ gives a partial match for the subject "abc"
824        (previously it gave "no match").
826    5.  Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
827        of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
828        previously a full match would be given. However, setting PCRE_PARTIAL_HARD
829        has an implication that the given string is incomplete (because a partial
830        match is preferred over a full match). For this reason, these items now
831        give a partial match in this situation. [Aside: previously, the one case
832        /t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
833        match rather than a full match, which was wrong by the old rules, but is
834        now correct.]
836    6.  There was a bug in the handling of #-introduced comments, recognized when
837        PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
838        If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
839        UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
840        scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
841        but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
842        places in pcre_compile().
844    7.  Related to (6) above, when pcre_compile() was skipping #-introduced
845        comments when looking ahead for named forward references to subpatterns,
846        the only newline sequence it recognized was NL. It now handles newlines
847        according to the set newline convention.
849    8.  SunOS4 doesn't have strerror() or strtoul(); pcregrep dealt with the
850        former, but used strtoul(), whereas pcretest avoided strtoul() but did not
851        cater for a lack of strerror(). These oversights have been fixed.
853    9.  Added --match-limit and --recursion-limit to pcregrep.
855    10. Added two casts needed to build with Visual Studio when NO_RECURSE is set.
857    11. When the -o option was used, pcregrep was setting a return code of 1, even
858        when matches were found, and --line-buffered was not being honoured.
860    12. Added an optional parentheses number to the -o and --only-matching options
861        of pcregrep.
863    13. Imitating Perl's /g action for multiple matches is tricky when the pattern
864        can match an empty string. The code to do it in pcretest and pcredemo
865        needed fixing:
867        (a) When the newline convention was "crlf", pcretest got it wrong, skipping
868            only one byte after an empty string match just before CRLF (this case
869            just got forgotten; "any" and "anycrlf" were OK).
871        (b) The pcretest code also had a bug, causing it to loop forever in UTF-8
872            mode when an empty string match preceded an ASCII character followed by
873            a non-ASCII character. (The code for advancing by one character rather
874            than one byte was nonsense.)
876        (c) The pcredemo.c sample program did not have any code at all to handle
877            the cases when CRLF is a valid newline sequence.
879    14. Neither pcre_exec() nor pcre_dfa_exec() was checking that the value given
880        as a starting offset was within the subject string. There is now a new
881        error, PCRE_ERROR_BADOFFSET, which is returned if the starting offset is
882        negative or greater than the length of the string. In order to test this,
883        pcretest is extended to allow the setting of negative starting offsets.
885    15. In both pcre_exec() and pcre_dfa_exec() the code for checking that the
886        starting offset points to the beginning of a UTF-8 character was
887        unnecessarily clumsy. I tidied it up.
889    16. Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
890        bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
892    17. Nobody had reported that the --include_dir option, which was added in
893        release 7.7 should have been called --include-dir (hyphen, not underscore)
894        for compatibility with GNU grep. I have changed it to --include-dir, but
895        left --include_dir as an undocumented synonym, and the same for
896        --exclude-dir, though that is not available in GNU grep, at least as of
897        release 2.5.4.
899    18. At a user's suggestion, the macros GETCHAR and friends (which pick up UTF-8
900        characters from a string of bytes) have been redefined so as not to use
901        loops, in order to improve performance in some environments. At the same
902        time, I abstracted some of the common code into auxiliary macros to save
903        repetition (this should not affect the compiled code).
905    19. If \c was followed by a multibyte UTF-8 character, bad things happened. A
906        compile-time error is now given if \c is not followed by an ASCII
907        character, that is, a byte less than 128. (In EBCDIC mode, the code is
908        different, and any byte value is allowed.)
910    20. Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
911        START_OPTIMIZE option, which is now allowed at compile time - but just
912        passed through to pcre_exec() or pcre_dfa_exec(). This makes it available
913        to pcregrep and other applications that have no direct access to PCRE
914        options. The new /Y option in pcretest sets this option when calling
915        pcre_compile().
917    21. Change 18 of release 8.01 broke the use of named subpatterns for recursive
918        back references. Groups containing recursive back references were forced to
919        be atomic by that change, but in the case of named groups, the amount of
920        memory required was incorrectly computed, leading to "Failed: internal
921        error: code overflow". This has been fixed.
923    22. Some patches to pcre_stringpiece.h, pcre_stringpiece_unittest.cc, and
924        pcretest.c, to avoid build problems in some Borland environments.
927    Version 8.10 25-Jun-2010
928  ------------------------  ------------------------
930  1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and  1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
# Line 9  Version 8.10 03 May-2010 Line 932  Version 8.10 03 May-2010
933  2.  (*ACCEPT) was not working when inside an atomic group.  2.  (*ACCEPT) was not working when inside an atomic group.
935  3.  Inside a character class, \B is treated as a literal by default, but  3.  Inside a character class, \B is treated as a literal by default, but
936      faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option      faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
937      causes the error). The code is unchanged, but I tidied the documentation.      causes the error). The code is unchanged, but I tidied the documentation.
939  4.  Inside a character class, PCRE always treated \R and \X as literals,  4.  Inside a character class, PCRE always treated \R and \X as literals,
940      whereas Perl faults them if its -w option is set. I have changed PCRE so      whereas Perl faults them if its -w option is set. I have changed PCRE so
941      that it faults them when PCRE_EXTRA is set.      that it faults them when PCRE_EXTRA is set.
943  5.  Added support for \N, which always matches any character other than  5.  Added support for \N, which always matches any character other than
944      newline. (It is the same as "." when PCRE_DOTALL is not set.)      newline. (It is the same as "." when PCRE_DOTALL is not set.)
946  6.  When compiling pcregrep with newer versions of gcc which may have  6.  When compiling pcregrep with newer versions of gcc which may have
947      FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',      FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
948      declared with attribute warn_unused_result" were given. Just casting the      declared with attribute warn_unused_result" were given. Just casting the
949      result to (void) does not stop the warnings; a more elaborate fudge is      result to (void) does not stop the warnings; a more elaborate fudge is
950      needed. I've used a macro to implement this.      needed. I've used a macro to implement this.
952    7.  Minor change to pcretest.c to avoid a compiler warning.
954    8.  Added four artifical Unicode properties to help with an option to make
955        \s etc use properties (see next item). The new properties are: Xan
956        (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
958    9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
959        use Unicode properties. (*UCP) at the start of a pattern can be used to set
960        this option. Modified pcretest to add /W to test this facility. Added
961        REG_UCP to make it available via the POSIX interface.
963    10. Added --line-buffered to pcregrep.
965    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
966        studied, and the match started with a letter with a code point greater than
967        127 whose first byte was different to the first byte of the other case of
968        the letter, the other case of this starting letter was not recognized
969        (#976).
971    12. If a pattern that was studied started with a repeated Unicode property
972        test, for example, \p{Nd}+, there was the theoretical possibility of
973        setting up an incorrect bitmap of starting bytes, but fortunately it could
974        not have actually happened in practice until change 8 above was made (it
975        added property types that matched character-matching opcodes).
977    13. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
978        possible starting bytes for non-anchored patterns.
980    14. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes
981        \R, and also a number of cases that involve Unicode properties, both
982        explicit and implicit when PCRE_UCP is set.
984    15. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
985        input, it could crash or give wrong results if characters with values
986        greater than 0xc0 were present in the subject string. (Detail: it assumed
987        UTF-8 input when processing these items.)
989    16. Added a lot of (int) casts to avoid compiler warnings in systems where
990        size_t is 64-bit (#991).
992    17. Added a check for running out of memory when PCRE is compiled with
993        --disable-stack-for-recursion (#990).
995    18. If the last data line in a file for pcretest does not have a newline on
996        the end, a newline was missing in the output.
998    19. The default pcre_chartables.c file recognizes only ASCII characters (values
999        less than 128) in its various bitmaps. However, there is a facility for
1000        generating tables according to the current locale when PCRE is compiled. It
1001        turns out that in some environments, 0x85 and 0xa0, which are Unicode space
1002        characters, are recognized by isspace() and therefore were getting set in
1003        these tables, and indeed these tables seem to approximate to ISO 8859. This
1004        caused a problem in UTF-8 mode when pcre_study() was used to create a list
1005        of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
1006        which of course cannot start UTF-8 characters. I have changed the code so
1007        that only real ASCII characters (less than 128) and the correct starting
1008        bytes for UTF-8 encodings are set for characters greater than 127 when in
1009        UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
1010        altogether.)
1012    20. Added the /T option to pcretest so as to be able to run tests with non-
1013        standard character tables, thus making it possible to include the tests
1014        used for 19 above in the standard set of tests.
1016    21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
1017        reference to a subpattern the other side of a comment that contains an
1018        opening parenthesis caused either an internal compiling error, or a
1019        reference to the wrong subpattern.
1022  Version 8.02 19-Mar-2010  Version 8.02 19-Mar-2010

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