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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4    Version 8.32 30-November-2012
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.
68    15. The EBCDIC support had decayed; later updates to the code had included
69        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
70        general tidy up of EBCDIC-related issues, and the documentation was also
71        not quite right. There is now a test that can be run on ASCII systems to
72        check some of the EBCDIC-related things (but is it not a full test).
74    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
75        in a small tidy to the code.
77    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
79    18. If the --only-matching (-o) option in pcregrep is specified multiple
80        times, each one causes appropriate output. For example, -o1 -o2 outputs the
81        substrings matched by the 1st and 2nd capturing parentheses. A separating
82        string can be specified by --om-separator (default empty).
84    19. Improving the first n character searches.
86    20. Turn case lists for horizontal and vertical white space into macros so that
87        they are defined only once.
89    21. This set of changes together give more compatible Unicode case-folding
90        behaviour for characters that have more than one other case when UCP
91        support is available.
93        (a) The Unicode property table now has offsets into a new table of sets of
94            three or more characters that are case-equivalent. The MultiStage2.py
95            script that generates these tables (the pcre_ucd.c file) now scans
96            CaseFolding.txt instead of UnicodeData.txt for character case
97            information.
99        (b) The code for adding characters or ranges of characters to a character
100            class has been abstracted into a generalized function that also handles
101            case-independence. In UTF-mode with UCP support, this uses the new data
102            to handle characters with more than one other case.
104        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
105            whose other case is greater than 256 are now correctly matched
106            caselessly. Previously, the high codepoint matched the low one, but not
107            vice versa.
109        (d) The processing of \h, \H, \v, and \ in character classes now makes use
110            of the new class addition function, using character lists defined as
111            macros alongside the case definitions of 20 above.
113        (e) Caseless back references now work with characters that have more than
114            one other case.
116        (f) General caseless matching of characters with more than one other case
117            is supported.
119    22. Unicode character properties were updated from Unicode 6.2.0
121    23. Improved CMake support under Windows. Patch by Daniel Richard G.
123    24. Add support for 32-bit character strings, and UTF-32
125    25. Major JIT compiler update (code refactoring and bugfixing).
126        Experimental Sparc 32 support is added.
128    26. Applied a modified version of Daniel Richard G's patch to create
129        pcre.h.generic and config.h.generic by "make" instead of in the
130        PrepareRelease script.
132    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
133        pcre_compile.c when checking for a zero character.
135    28. Introducing a native interface for JIT. Through this interface, the compiled
136        machine code can be directly executed. The purpose of this interface is to
137        provide fast pattern matching, so several sanity checks are not performed.
138        However, feature tests are still performed. The new interface provides
139        1.4x speedup compared to the old one.
141    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
142        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
143        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
145    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
146        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
147        the "old" RFC 2279). Instead, it ended up passing a negative length to
148        pcre_exec().
150    31. Add support for GCC's visibility feature to hide internal functions.
152    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
153        "unknown -C option" after outputting 0 or 1.
155    33. There is now support for generating a code coverage report for the test
156        suite in environments where gcc is the compiler and lcov is installed. This
157        is mainly for the benefit of the developers.
159    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
160        unaddressable using valgrind annotations, allowing valgrind to detect
161        invalid memory accesses. This is mainly for the benefit of the developers.
163    25. (*UTF) can now be used to start a pattern in any of the three libraries.
165    26. Give configure error if --enable-cpp but no C++ compiler found.
168    Version 8.31 06-July-2012
169    -------------------------
171    1.  Fixing a wrong JIT test case and some compiler warnings.
173    2.  Removed a bashism from the RunTest script.
175    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
176        to unsigned type, result still unsigned" that was given by an MS compiler
177        on encountering the code "-sizeof(xxx)".
179    4.  Partial matching support is added to the JIT compiler.
181    5.  Fixed several bugs concerned with partial matching of items that consist
182        of more than one character:
184        (a) /^(..)\1/ did not partially match "aba" because checking references was
185            done on an "all or nothing" basis. This also applied to repeated
186            references.
188        (b) \R did not give a hard partial match if \r was found at the end of the
189            subject.
191        (c) \X did not give a hard partial match after matching one or more
192            characters at the end of the subject.
194        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
195            a partial match for the string "\r".
197        (e) When newline was set to CRLF, the metacharacter "." did not recognize
198            a partial match for a CR character at the end of the subject string.
200    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
201        running pcretest, the text "(JIT)" added to the output whenever JIT is
202        actually used to run the match.
204    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
205        or /S+[+] with a digit between 1 and 7.
207    8.  OP_NOT now supports any UTF character not just single-byte ones.
209    9.  (*MARK) control verb is now supported by the JIT compiler.
211    10. The command "./RunTest list" lists the available tests without actually
212        running any of them. (Because I keep forgetting what they all are.)
216    12. Applied a (slightly modified) user-supplied patch that improves performance
217        when the heap is used for recursion (compiled with --disable-stack-for-
218        recursion). Instead of malloc and free for each heap frame each time a
219        logical recursion happens, frames are retained on a chain and re-used where
220        possible. This sometimes gives as much as 30% improvement.
222    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
223        call.
225    14. As documented, (*COMMIT) is now confined to within a positive assertion.
227    15. It is now possible to link pcretest with libedit as an alternative to
228        libreadline.
230    16. (*COMMIT) control verb is now supported by the JIT compiler.
232    17. The Unicode data tables have been updated to Unicode 6.1.0.
234    18. Added --file-list option to pcregrep.
236    19. Added binary file support to pcregrep, including the -a, --binary-files,
237        -I, and --text options.
239    20. The madvise function is renamed for posix_madvise for QNX compatibility
240        reasons. Fixed by Giuseppe D'Angelo.
242    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
244    22. Changed the option for creating symbolic links for 16-bit man pages from
245        -s to -sf so that re-installing does not cause issues.
247    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
249    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
250        matches in certain environments (the workspace was not being correctly
251        retained). Also added to pcre_dfa_exec() a simple plausibility check on
252        some of the workspace data at the beginning of a restart.
254    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
255        was not doing so when it should - probably a typo introduced by SVN 528
256        (change 8.10/14).
258    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
259        \w+ when the character tables indicated that \x{c4} was a word character.
260        There were several related cases, all because the tests for doing a table
261        lookup were testing for characters less than 127 instead of 255.
263    27. If a pattern contains capturing parentheses that are not used in a match,
264        their slots in the ovector are set to -1. For those that are higher than
265        any matched groups, this happens at the end of processing. In the case when
266        there were back references that the ovector was too small to contain
267        (causing temporary malloc'd memory to be used during matching), and the
268        highest capturing number was not used, memory off the end of the ovector
269        was incorrectly being set to -1. (It was using the size of the temporary
270        memory instead of the true size.)
272    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
273        ovector size, it uses memory at the end of the block that it has got.
275    29. Check for an overlong MARK name and give an error at compile time. The
276        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
278    30. JIT compiler update.
280    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
281        Rill for the patch.
283    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
285    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
287    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
288        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
289        was enabled.
291    35. Improve JIT code generation for greedy plus quantifier.
293    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
294        1 to "aa" instead of to an empty string. The bug affected repeated groups
295        that could potentially match an empty string.
297    37. Optimizing single character iterators in JIT.
299    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
300        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
301        codepoints that are too big for the mode are faulted, and in a UTF mode,
302        disallowed codepoints are also faulted.
304    39. If PCRE was compiled with UTF support, in three places in the DFA
305        matcher there was code that should only have been obeyed in UTF mode, but
306        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
307        processing when bytes with values greater than 127 were present. In 16-bit
308        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
309        both cases the values are those that cannot be the first data item in a UTF
310        character. The three items that might have provoked this were recursions,
311        possessively repeated groups, and atomic groups.
313    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
314        and pcregrep, because some OS require shared objects to be explicitly
315        passed to ld, causing the link step to fail if they are not.
317    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
318        mode, patterns that started with \h* or \R* might be incorrectly matched.
321    Version 8.30 04-February-2012
322    -----------------------------
324    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
325        name is defined in ctype.h.
327    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
328        only in quite long subpatterns.
330    3.  Removed the function pcre_info(), which has been obsolete and deprecated
331        since it was replaced by pcre_fullinfo() in February 2000.
333    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
334        match a (*MARK), and the match failed at the start of the subject, a
335        reference to memory before the start of the subject could occur. This bug
336        was introduced by fix 17 of release 8.21.
338    5.  A reference to an unset group with zero minimum repetition was giving
339        totally wrong answers (in non-JavaScript-compatibility mode). For example,
340        /(another)?(\1?)test/ matched against "hello world test". This bug was
341        introduced in release 8.13.
343    6.  Add support for 16-bit character strings (a large amount of work involving
344        many changes and refactorings).
346    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
347        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
348        from a file.
350    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
351        rounding is not applied in this particular case).
353    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
354        if they appear, or are escaped, in patterns.
356    10. Get rid of a number of -Wunused-but-set-variable warnings.
358    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
359        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
360        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
361        also returns the mark "x". This bug applied to capturing parentheses,
362        non-capturing parentheses, and atomic parentheses. It also applied to some
363        assertions.
365    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
366        information out of configure.ac instead of relying on pcre.h.generic, which
367        is not stored in the repository.
369    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
370        -lreadline.
372    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
374    15. Applied Graycode's patch to put the top-level frame on the stack rather
375        than the heap when not using the stack for recursion. This gives a
376        performance improvement in many cases when recursion is not deep.
378    16. Experimental code added to "pcretest -C" to output the stack frame size.
381    Version 8.21 12-Dec-2011
382    ------------------------
384    1.  Updating the JIT compiler.
386    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
387        are added as well.
389    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
390        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
391        calling _pcre_jit_exec. Some extra comments are added.
393    4.  (*MARK) settings inside atomic groups that do not contain any capturing
394        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
395        was introduced by change 18 for 8.20.
397    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
398        ECMA-262 standard.
400    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
401        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
402        This bug was probably introduced by change 9 of 8.13.
404    7.  While fixing 6 above, I noticed that a number of other items were being
405        incorrectly rejected as "not fixed length". This arose partly because newer
406        opcodes had not been added to the fixed-length checking code. I have (a)
407        corrected the bug and added tests for these items, and (b) arranged for an
408        error to occur if an unknown opcode is encountered while checking for fixed
409        length instead of just assuming "not fixed length". The items that were
410        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
411        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
412        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
414    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
415        being incorrectly compiled and would have given unpredicatble results.
417    9.  A possessively repeated subpattern with minimum repeat count greater than
418        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
419        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
420        the first (A) could occur when it should not.
422    10. Add a cast and remove a redundant test from the code.
424    11. JIT should use pcre_malloc/pcre_free for allocation.
426    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
427        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
428        is anything other than /usr, -L is still shown).
430    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
432    14. Perl does not support \N without a following name in a [] class; PCRE now
433        also gives an error.
435    15. If a forward reference was repeated with an upper limit of around 2000,
436        it caused the error "internal error: overran compiling workspace". The
437        maximum number of forward references (including repeats) was limited by the
438        internal workspace, and dependent on the LINK_SIZE. The code has been
439        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
440        the default depends on LINK_SIZE. There is a new upper limit (for safety)
441        of around 200,000 forward references. While doing this, I also speeded up
442        the filling in of repeated forward references.
444    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
445        incorrectly expecting the subject to contain another "a" after the start.
447    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
448        in the match, the SKIP should be ignored. This was not happening; instead
449        the SKIP was being treated as NOMATCH. For patterns such as
450        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
451        tested.
453    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
454        now much more compatible with Perl, in particular in cases where the result
455        is a non-match for a non-anchored pattern. For example, if
456        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
457        "m", where previously it did not return a name. A side effect of this
458        change is that for partial matches, the last encountered mark name is
459        returned, as for non matches. A number of tests that were previously not
460        Perl-compatible have been moved into the Perl-compatible test files. The
461        refactoring has had the pleasing side effect of removing one argument from
462        the match() function, thus reducing its stack requirements.
464    19. If the /S+ option was used in pcretest to study a pattern using JIT,
465        subsequent uses of /S (without +) incorrectly behaved like /S+.
467    21. Retrieve executable code size support for the JIT compiler and fixing
468        some warnings.
470    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
471        not work when the shorter character appeared right at the end of the
472        subject string.
474    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
475        systems.
477    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
478        output it when the /M option is used in pcretest.
480    25. The CheckMan script was not being included in the distribution. Also, added
481        an explicit "perl" to run Perl scripts from the PrepareRelease script
482        because this is reportedly needed in Windows.
484    26. If study data was being save in a file and studying had not found a set of
485        "starts with" bytes for the pattern, the data written to the file (though
486        never used) was taken from uninitialized memory and so caused valgrind to
487        complain.
489    27. Updated RunTest.bat as provided by Sheri Pierce.
491    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
493    29. Computation of memory usage for the table of capturing group names was
494        giving an unnecessarily large value.
497    Version 8.20 21-Oct-2011
498    ------------------------
500    1.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had
501        a POSIX class. After further experiments with Perl, which convinced me that
502        Perl has bugs and confusions, a closing square bracket is no longer allowed
503        in a POSIX name. This bug also affected patterns with classes that started
504        with full stops.
506    2.  If a pattern such as /(a)b|ac/ is matched against "ac", there is no
507        captured substring, but while checking the failing first alternative,
508        substring 1 is temporarily captured. If the output vector supplied to
509        pcre_exec() was not big enough for this capture, the yield of the function
510        was still zero ("insufficient space for captured substrings"). This cannot
511        be totally fixed without adding another stack variable, which seems a lot
512        of expense for a edge case. However, I have improved the situation in cases
513        such as /(a)(b)x|abc/ matched against "abc", where the return code
514        indicates that fewer than the maximum number of slots in the ovector have
515        been set.
517    3.  Related to (2) above: when there are more back references in a pattern than
518        slots in the output vector, pcre_exec() uses temporary memory during
519        matching, and copies in the captures as far as possible afterwards. It was
520        using the entire output vector, but this conflicts with the specification
521        that only 2/3 is used for passing back captured substrings. Now it uses
522        only the first 2/3, for compatibility. This is, of course, another edge
523        case.
525    4.  Zoltan Herczeg's just-in-time compiler support has been integrated into the
526        main code base, and can be used by building with --enable-jit. When this is
527        done, pcregrep automatically uses it unless --disable-pcregrep-jit or the
528        runtime --no-jit option is given.
530    5.  When the number of matches in a pcre_dfa_exec() run exactly filled the
531        ovector, the return from the function was zero, implying that there were
532        other matches that did not fit. The correct "exactly full" value is now
533        returned.
535    6.  If a subpattern that was called recursively or as a subroutine contained
536        (*PRUNE) or any other control that caused it to give a non-standard return,
537        invalid errors such as "Error -26 (nested recursion at the same subject
538        position)" or even infinite loops could occur.
540    7.  If a pattern such as /a(*SKIP)c|b(*ACCEPT)|/ was studied, it stopped
541        computing the minimum length on reaching *ACCEPT, and so ended up with the
542        wrong value of 1 rather than 0. Further investigation indicates that
543        computing a minimum subject length in the presence of *ACCEPT is difficult
544        (think back references, subroutine calls), and so I have changed the code
545        so that no minimum is registered for a pattern that contains *ACCEPT.
547    8.  If (*THEN) was present in the first (true) branch of a conditional group,
548        it was not handled as intended. [But see 16 below.]
550    9.  Replaced RunTest.bat and CMakeLists.txt with improved versions provided by
551        Sheri Pierce.
553    10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that
554        the first byte in a match must be "a".
556    11. Change 17 for 8.13 increased the recursion depth for patterns like
557        /a(?:.)*?a/ drastically. I've improved things by remembering whether a
558        pattern contains any instances of (*THEN). If it does not, the old
559        optimizations are restored. It would be nice to do this on a per-group
560        basis, but at the moment that is not feasible.
562    12. In some environments, the output of pcretest -C is CRLF terminated. This
563        broke RunTest's code that checks for the link size. A single white space
564        character after the value is now allowed for.
566    13. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".
567        For "fr", it uses the Windows-specific input and output files.
569    14. If (*THEN) appeared in a group that was called recursively or as a
570        subroutine, it did not work as intended. [But see next item.]
572    15. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex
573        pattern fragments (but not containing any | characters). If A and B are
574        matched, but there is a failure in C so that it backtracks to (*THEN), PCRE
575        was behaving differently to Perl. PCRE backtracked into A, but Perl goes to
576        D. In other words, Perl considers parentheses that do not contain any |
577        characters to be part of a surrounding alternative, whereas PCRE was
578        treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles
579        differently. PCRE now behaves in the same way as Perl, except in the case
580        of subroutine/recursion calls such as (?1) which have in any case always
581        been different (but PCRE had them first :-).
583    16. Related to 15 above: Perl does not treat the | in a conditional group as
584        creating alternatives. Such a group is treated in the same way as an
585        ordinary group without any | characters when processing (*THEN). PCRE has
586        been changed to match Perl's behaviour.
588    17. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the
589        RunGrepTest script failed.
591    18. Change 22 for version 13 caused atomic groups to use more stack. This is
592        inevitable for groups that contain captures, but it can lead to a lot of
593        stack use in large patterns. The old behaviour has been restored for atomic
594        groups that do not contain any capturing parentheses.
596    19. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not
597        suppress the check for a minimum subject length at run time. (If it was
598        given to pcre_exec() or pcre_dfa_exec() it did work.)
600    20. Fixed an ASCII-dependent infelicity in pcretest that would have made it
601        fail to work when decoding hex characters in data strings in EBCDIC
602        environments.
604    21. It appears that in at least one Mac OS environment, the isxdigit() function
605        is implemented as a macro that evaluates to its argument more than once,
606        contravening the C 90 Standard (I haven't checked a later standard). There
607        was an instance in pcretest which caused it to go wrong when processing
608        \x{...} escapes in subject strings. The has been rewritten to avoid using
609        things like p++ in the argument of isxdigit().
612    Version 8.13 16-Aug-2011
613    ------------------------
615    1.  The Unicode data tables have been updated to Unicode 6.0.0.
617    2.  Two minor typos in pcre_internal.h have been fixed.
619    3.  Added #include <string.h> to pcre_scanner_unittest.cc, pcrecpp.cc, and
620        pcrecpp_unittest.cc. They are needed for strcmp(), memset(), and strchr()
621        in some environments (e.g. Solaris 10/SPARC using Sun Studio 12U2).
623    4.  There were a number of related bugs in the code for matching backrefences
624        caselessly in UTF-8 mode when codes for the characters concerned were
625        different numbers of bytes. For example, U+023A and U+2C65 are an upper
626        and lower case pair, using 2 and 3 bytes, respectively. The main bugs were:
627        (a) A reference to 3 copies of a 2-byte code matched only 2 of a 3-byte
628        code. (b) A reference to 2 copies of a 3-byte code would not match 2 of a
629        2-byte code at the end of the subject (it thought there wasn't enough data
630        left).
632    5.  Comprehensive information about what went wrong is now returned by
633        pcre_exec() and pcre_dfa_exec() when the UTF-8 string check fails, as long
634        as the output vector has at least 2 elements. The offset of the start of
635        the failing character and a reason code are placed in the vector.
637    6.  When the UTF-8 string check fails for pcre_compile(), the offset that is
638        now returned is for the first byte of the failing character, instead of the
639        last byte inspected. This is an incompatible change, but I hope it is small
640        enough not to be a problem. It makes the returned offset consistent with
641        pcre_exec() and pcre_dfa_exec().
643    7.  pcretest now gives a text phrase as well as the error number when
644        pcre_exec() or pcre_dfa_exec() fails; if the error is a UTF-8 check
645        failure, the offset and reason code are output.
647    8.  When \R was used with a maximizing quantifier it failed to skip backwards
648        over a \r\n pair if the subsequent match failed. Instead, it just skipped
649        back over a single character (\n). This seems wrong (because it treated the
650        two characters as a single entity when going forwards), conflicts with the
651        documentation that \R is equivalent to (?>\r\n|\n|...etc), and makes the
652        behaviour of \R* different to (\R)*, which also seems wrong. The behaviour
653        has been changed.
655    9.  Some internal refactoring has changed the processing so that the handling
656        of the PCRE_CASELESS and PCRE_MULTILINE options is done entirely at compile
657        time (the PCRE_DOTALL option was changed this way some time ago: version
658        7.7 change 16). This has made it possible to abolish the OP_OPT op code,
659        which was always a bit of a fudge. It also means that there is one less
660        argument for the match() function, which reduces its stack requirements
661        slightly. This change also fixes an incompatibility with Perl: the pattern
662        (?i:([^b]))(?1) should not match "ab", but previously PCRE gave a match.
664    10. More internal refactoring has drastically reduced the number of recursive
665        calls to match() for possessively repeated groups such as (abc)++ when
666        using pcre_exec().
668    11. While implementing 10, a number of bugs in the handling of groups were
669        discovered and fixed:
671        (?<=(a)+) was not diagnosed as invalid (non-fixed-length lookbehind).
672        (a|)*(?1) gave a compile-time internal error.
673        ((a|)+)+  did not notice that the outer group could match an empty string.
674        (^a|^)+   was not marked as anchored.
675        (.*a|.*)+ was not marked as matching at start or after a newline.
677    12. Yet more internal refactoring has removed another argument from the match()
678        function. Special calls to this function are now indicated by setting a
679        value in a variable in the "match data" data block.
681    13. Be more explicit in pcre_study() instead of relying on "default" for
682        opcodes that mean there is no starting character; this means that when new
683        ones are added and accidentally left out of pcre_study(), testing should
684        pick them up.
686    14. The -s option of pcretest has been documented for ages as being an old
687        synonym of -m (show memory usage). I have changed it to mean "force study
688        for every regex", that is, assume /S for every regex. This is similar to -i
689        and -d etc. It's slightly incompatible, but I'm hoping nobody is still
690        using it. It makes it easier to run collections of tests with and without
691        study enabled, and thereby test pcre_study() more easily. All the standard
692        tests are now run with and without -s (but some patterns can be marked as
693        "never study" - see 20 below).
695    15. When (*ACCEPT) was used in a subpattern that was called recursively, the
696        restoration of the capturing data to the outer values was not happening
697        correctly.
699    16. If a recursively called subpattern ended with (*ACCEPT) and matched an
700        empty string, and PCRE_NOTEMPTY was set, pcre_exec() thought the whole
701        pattern had matched an empty string, and so incorrectly returned a no
702        match.
704    17. There was optimizing code for the last branch of non-capturing parentheses,
705        and also for the obeyed branch of a conditional subexpression, which used
706        tail recursion to cut down on stack usage. Unfortunately, now that there is
707        the possibility of (*THEN) occurring in these branches, tail recursion is
708        no longer possible because the return has to be checked for (*THEN). These
709        two optimizations have therefore been removed. [But see 8.20/11 above.]
711    18. If a pattern containing \R was studied, it was assumed that \R always
712        matched two bytes, thus causing the minimum subject length to be
713        incorrectly computed because \R can also match just one byte.
715    19. If a pattern containing (*ACCEPT) was studied, the minimum subject length
716        was incorrectly computed.
718    20. If /S is present twice on a test pattern in pcretest input, it now
719        *disables* studying, thereby overriding the use of -s on the command line
720        (see 14 above). This is necessary for one or two tests to keep the output
721        identical in both cases.
723    21. When (*ACCEPT) was used in an assertion that matched an empty string and
724        PCRE_NOTEMPTY was set, PCRE applied the non-empty test to the assertion.
726    22. When an atomic group that contained a capturing parenthesis was
727        successfully matched, but the branch in which it appeared failed, the
728        capturing was not being forgotten if a higher numbered group was later
729        captured. For example, /(?>(a))b|(a)c/ when matching "ac" set capturing
730        group 1 to "a", when in fact it should be unset. This applied to multi-
731        branched capturing and non-capturing groups, repeated or not, and also to
732        positive assertions (capturing in negative assertions does not happen
733        in PCRE) and also to nested atomic groups.
735    23. Add the ++ qualifier feature to pcretest, to show the remainder of the
736        subject after a captured substring, to make it easier to tell which of a
737        number of identical substrings has been captured.
739    24. The way atomic groups are processed by pcre_exec() has been changed so that
740        if they are repeated, backtracking one repetition now resets captured
741        values correctly. For example, if ((?>(a+)b)+aabab) is matched against
742        "aaaabaaabaabab" the value of captured group 2 is now correctly recorded as
743        "aaa". Previously, it would have been "a". As part of this code
744        refactoring, the way recursive calls are handled has also been changed.
746    25. If an assertion condition captured any substrings, they were not passed
747        back unless some other capturing happened later. For example, if
748        (?(?=(a))a) was matched against "a", no capturing was returned.
750    26. When studying a pattern that contained subroutine calls or assertions,
751        the code for finding the minimum length of a possible match was handling
752        direct recursions such as (xxx(?1)|yyy) but not mutual recursions (where
753        group 1 called group 2 while simultaneously a separate group 2 called group
754        1). A stack overflow occurred in this case. I have fixed this by limiting
755        the recursion depth to 10.
757    27. Updated RunTest.bat in the distribution to the version supplied by Tom
758        Fortmann. This supports explicit test numbers on the command line, and has
759        argument validation and error reporting.
761    28. An instance of \X with an unlimited repeat could fail if at any point the
762        first character it looked at was a mark character.
764    29. Some minor code refactoring concerning Unicode properties and scripts
765        should reduce the stack requirement of match() slightly.
767    30. Added the '=' option to pcretest to check the setting of unused capturing
768        slots at the end of the pattern, which are documented as being -1, but are
769        not included in the return count.
771    31. If \k was not followed by a braced, angle-bracketed, or quoted name, PCRE
772        compiled something random. Now it gives a compile-time error (as does
773        Perl).
775    32. A *MARK encountered during the processing of a positive assertion is now
776        recorded and passed back (compatible with Perl).
778    33. If --only-matching or --colour was set on a pcregrep call whose pattern
779        had alternative anchored branches, the search for a second match in a line
780        was done as if at the line start. Thus, for example, /^01|^02/ incorrectly
781        matched the line "0102" twice. The same bug affected patterns that started
782        with a backwards assertion. For example /\b01|\b02/ also matched "0102"
783        twice.
785    34. Previously, PCRE did not allow quantification of assertions. However, Perl
786        does, and because of capturing effects, quantifying parenthesized
787        assertions may at times be useful. Quantifiers are now allowed for
788        parenthesized assertions.
790    35. A minor code tidy in pcre_compile() when checking options for \R usage.
792    36. \g was being checked for fancy things in a character class, when it should
793        just be a literal "g".
795    37. PCRE was rejecting [:a[:digit:]] whereas Perl was not. It seems that the
796        appearance of a nested POSIX class supersedes an apparent external class.
797        For example, [:a[:digit:]b:] matches "a", "b", ":", or a digit. Also,
798        unescaped square brackets may also appear as part of class names. For
799        example, [:a[:abc]b:] gives unknown class "[:abc]b:]". PCRE now behaves
800        more like Perl. (But see 8.20/1 above.)
802    38. PCRE was giving an error for \N with a braced quantifier such as {1,} (this
803        was because it thought it was \N{name}, which is not supported).
805    39. Add minix to OS list not supporting the -S option in pcretest.
807    40. PCRE tries to detect cases of infinite recursion at compile time, but it
808        cannot analyze patterns in sufficient detail to catch mutual recursions
809        such as ((?1))((?2)). There is now a runtime test that gives an error if a
810        subgroup is called recursively as a subpattern for a second time at the
811        same position in the subject string. In previous releases this might have
812        been caught by the recursion limit, or it might have run out of stack.
814    41. A pattern such as /(?(R)a+|(?R)b)/ is quite safe, as the recursion can
815        happen only once. PCRE was, however incorrectly giving a compile time error
816        "recursive call could loop indefinitely" because it cannot analyze the
817        pattern in sufficient detail. The compile time test no longer happens when
818        PCRE is compiling a conditional subpattern, but actual runaway loops are
819        now caught at runtime (see 40 above).
821    42. It seems that Perl allows any characters other than a closing parenthesis
822        to be part of the NAME in (*MARK:NAME) and other backtracking verbs. PCRE
823        has been changed to be the same.
825    43. Updated configure.ac to put in more quoting round AC_LANG_PROGRAM etc. so
826        as not to get warnings when autogen.sh is called. Also changed
827        AC_PROG_LIBTOOL (deprecated) to LT_INIT (the current macro).
829    44. To help people who use pcregrep to scan files containing exceedingly long
830        lines, the following changes have been made:
832        (a) The default value of the buffer size parameter has been increased from
833            8K to 20K. (The actual buffer used is three times this size.)
835        (b) The default can be changed by ./configure --with-pcregrep-bufsize when
836            PCRE is built.
838        (c) A --buffer-size=n option has been added to pcregrep, to allow the size
839            to be set at run time.
841        (d) Numerical values in pcregrep options can be followed by K or M, for
842            example --buffer-size=50K.
844        (e) If a line being scanned overflows pcregrep's buffer, an error is now
845            given and the return code is set to 2.
847    45. Add a pointer to the latest mark to the callout data block.
849    46. The pattern /.(*F)/, when applied to "abc" with PCRE_PARTIAL_HARD, gave a
850        partial match of an empty string instead of no match. This was specific to
851        the use of ".".
853    47. The pattern /f.*/8s, when applied to "for" with PCRE_PARTIAL_HARD, gave a
854        complete match instead of a partial match. This bug was dependent on both
855        the PCRE_UTF8 and PCRE_DOTALL options being set.
857    48. For a pattern such as /\babc|\bdef/ pcre_study() was failing to set up the
858        starting byte set, because \b was not being ignored.
861    Version 8.12 15-Jan-2011
862    ------------------------
864    1.  Fixed some typos in the markup of the man pages, and wrote a script that
865        checks for such things as part of the documentation building process.
867    2.  On a big-endian 64-bit system, pcregrep did not correctly process the
868        --match-limit and --recursion-limit options (added for 8.11). In
869        particular, this made one of the standard tests fail. (The integer value
870        went into the wrong half of a long int.)
872    3.  If the --colour option was given to pcregrep with -v (invert match), it
873        did strange things, either producing crazy output, or crashing. It should,
874        of course, ignore a request for colour when reporting lines that do not
875        match.
877    4.  Another pcregrep bug caused similar problems if --colour was specified with
878        -M (multiline) and the pattern match finished with a line ending.
880    5.  In pcregrep, when a pattern that ended with a literal newline sequence was
881        matched in multiline mode, the following line was shown as part of the
882        match. This seems wrong, so I have changed it.
884    6.  Another pcregrep bug in multiline mode, when --colour was specified, caused
885        the check for further matches in the same line (so they could be coloured)
886        to overrun the end of the current line. If another match was found, it was
887        incorrectly shown (and then shown again when found in the next line).
889    7.  If pcregrep was compiled under Windows, there was a reference to the
890        function pcregrep_exit() before it was defined. I am assuming this was
891        the cause of the "error C2371: 'pcregrep_exit' : redefinition;" that was
892        reported by a user. I've moved the definition above the reference.
895  Version 8.11 10-Dec-2010  Version 8.11 10-Dec-2010
896  ------------------------  ------------------------

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