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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 8.13 02-Aug-2011  Version 8.34 xx-xxxx-201x
5    --------------------------
7    1.  Add pcre[16|32]_jit_free_unused_memory to forcibly free unused JIT
8        executable memory. Patch inspired by Carsten Klein.
10    2.  ./configure --enable-coverage defined SUPPORT_GCOV in config.h, although
11        this macro is never tested and has no effect, because the work to support
12        coverage involves only compiling and linking options and special targets in
13        the Makefile. The comment in config.h implied that defining the macro would
14        enable coverage support, which is totally false. There was also support for
15        setting this macro in the CMake files (my fault, I just copied it from
16        configure). SUPPORT_GCOV has now been removed.
18    3.  Make a small performance improvement in strlen16() and strlen32() in
19        pcretest.
21    4.  Change 36 for 8.33 left some unreachable statements in pcre_exec.c,
22        detected by the Solaris compiler (gcc doesn't seem to be able to diagnose
23        these cases). There was also one in pcretest.c.
25    5.  Cleaned up a "may be uninitialized" compiler warning in pcre_exec.c.
27    6.  In UTF mode, the code for checking whether a group could match an empty
28        string (which is used for indefinitely repeated groups to allow for
29        breaking an infinite loop) was broken when the group contained a repeated
30        negated single-character class with a character that occupied more than one
31        data item and had a minimum repetition of zero (for example, [^\x{100}]* in
32        UTF-8 mode). The effect was undefined: the group might or might not be
33        deemed as matching an empty string, or the program might have crashed.
35    7.  The code for checking whether a group could match an empty string was not
36        recognizing that \h, \H, \v, \V, and \R must match a character.
38    8.  Implemented PCRE_INFO_MATCH_EMPTY, which yields 1 if the pattern can match
39        an empty string. If it can, pcretest shows this in its information output.
41    9.  Fixed two related bugs that applied to Unicode extended grapheme clusters
42        that were repeated with a maximizing qualifier (e.g. \X* or \X{2,5}) when
43        matched by pcre_exec() without using JIT:
45        (a) If the rest of the pattern did not match after a maximal run of
46            grapheme clusters, the code for backing up to try with fewer of them
47            did not always back up over a full grapheme when characters that do not
48            have the modifier quality were involved, e.g. Hangul syllables.
50        (b) If the match point in a subject started with modifier character, and
51            there was no match, the code could incorrectly back up beyond the match
52            point, and potentially beyond the first character in the subject,
53            leading to a segfault or an incorrect match result.
55    10. A conditional group with an assertion condition could lead to PCRE
56        recording an incorrect first data item for a match if no other first data
57        item was recorded. For example, the pattern (?(?=ab)ab) recorded "a" as a
58        first data item, and therefore matched "ca" after "c" instead of at the
59        start.
61    11. Change 40 for 8.33 (allowing pcregrep to find empty strings) showed up a
62        bug that caused the command "echo a | ./pcregrep -M '|a'" to loop.
64    12. The source of pcregrep now includes z/OS-specific code so that it can be
65        compiled for z/OS as part of the special z/OS distribution.
67    13. Added the -T and -TM options to pcretest.
69    14. The code in pcre_compile.c for creating the table of named capturing groups
70        has been refactored. Instead of creating the table dynamically during the
71        actual compiling pass, the information is remembered during the pre-compile
72        pass (on the stack unless there are more than 20 named groups, in which
73        case malloc() is used) and the whole table is created before the actual
74        compile happens. This has simplified the code (it is now nearly 150 lines
75        shorter) and prepared the way for better handling of references to groups
76        with duplicate names.
78    15. A back reference to a named subpattern when there is more than one of the
79        same name now checks them in the order in which they appear in the pattern.
80        The first one that is set is used for the reference. Previously only the
81        first one was inspected. This change makes PCRE more compatible with Perl.
83    16. Unicode character properties were updated from Unicode 6.3.0.
85    17. The compile-time code for auto-possessification has been refactored, based
86        on a patch by Zoltan Herczeg. It now happens after instead of during
87        compilation. The code is cleaner, and more cases are handled. The option
88        PCRE_NO_AUTO_POSSESSIFY is added for testing purposes, and the -O and /O
89        options in pcretest are provided to set it.
91    18. The character VT has been added to the set of characters that match \s and
92        are generally treated as white space, following this same change in Perl
93        5.18. There is now no difference between "Perl space" and "POSIX space".
95    19. The code for checking named groups as conditions, either for being set or
96        for being recursed, has been refactored (this is related to 14 and 15
97        above). Processing unduplicated named groups should now be as fast at
98        numerical groups, and processing duplicated groups should be faster than
99        before.
101    20. Two patches to the CMake build system, by Alexander Barkov:
103          (1) Replace the "source" command by "." in CMakeLists.txt because
104              "source" is a bash-ism.
106          (2) Add missing HAVE_STDINT_H and HAVE_INTTYPES_H to config-cmake.h.in;
107              without these the CMake build does not work on Solaris.
109    21. Perl has changed its handling of \8 and \9. If there is no previously
110        encountered capturing group of those numbers, they are treated as the
111        literal characters 8 and 9 instead of a binary zero followed by the
112        literals. PCRE now does the same.
114    22. Following Perl, added \o{} to specify codepoints in octal, making it
115        possible to specify values greater than 0777 and also making them
116        unambiguous.
118    23. Perl now gives an error for missing closing braces after \x{... instead of
119        treating the string as literal. PCRE now does the same.
121    24. RunTest used to grumble if an inappropriate test was selected explicitly,
122        but just skip it when running all tests. This make it awkward to run ranges
123        of tests when one of them was inappropriate. Now it just skips any
124        inappropriate tests, as it always did when running all tests.
126    25. If PCRE_AUTO_CALLOUT and PCRE_UCP were set for a pattern that contained
127        character types such as \d or \w, too many callouts were inserted, and the
128        data that they returned was rubbish.
130    26. In UCP mode, \s was not matching two of the characters that Perl matches,
131        namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they
132        were matched by \h. The code has now been refactored so that the lists of
133        the horizontal and vertical whitespace characters used for \h and \v (which
134        are defined only in one place) are now also used for \s.
136    27. Add JIT support for the 64 bit TileGX architecture.
137        Patch by Jiong Wang (Tilera Corporation).
139    28. Possessive quantifiers for classes (both explicit and automatically
140        generated) now use special opcodes instead of wrapping in ONCE brackets.
142    29. Whereas an item such as A{4}+ ignored the possessivenes of the quantifier
143        (because it's meaningless), this was not happening when PCRE_CASELESS was
144        set. Not wrong, but inefficient.
146    30. Updated perltest.pl to add /u (force Unicode mode) when /W (use Unicode
147        properties for \w, \d, etc) is present in a test regex. Otherwise if the
148        test contains no characters greater than 255, Perl doesn't realise it
149        should be using Unicode semantics.
151    31. Upgraded the handling of the POSIX classes [:graph:], [:print:], and
152        [:punct:] when PCRE_UCP is set so as to include the same characters as Perl
153        does in Unicode mode.
155    32. Added the "forbid" facility to pcretest so that putting tests into the
156        wrong test files can sometimes be quickly detected.
158    33. There is now a limit (default 250) on the depth of nesting of parentheses.
159        This limit is imposed to control the amount of system stack used at compile
160        time. It can be changed at build time by --with-parens-nest-limit=xxx or
161        the equivalent in CMake.
164    Version 8.33 28-May-2013
165    ------------------------
167    1.  Added 'U' to some constants that are compared to unsigned integers, to
168        avoid compiler signed/unsigned warnings. Added (int) casts to unsigned
169        variables that are added to signed variables, to ensure the result is
170        signed and can be negated.
172    2.  Applied patch by Daniel Richard G for quashing MSVC warnings to the
173        CMake config files.
175    3.  Revise the creation of config.h.generic so that all boolean macros are
176        #undefined, whereas non-boolean macros are #ifndef/#endif-ed. This makes
177        overriding via -D on the command line possible.
179    4.  Changing the definition of the variable "op" in pcre_exec.c from pcre_uchar
180        to unsigned int is reported to make a quite noticeable speed difference in
181        a specific Windows environment. Testing on Linux did also appear to show
182        some benefit (and it is clearly not harmful). Also fixed the definition of
183        Xop which should be unsigned.
185    5.  Related to (4), changing the definition of the intermediate variable cc
186        in repeated character loops from pcre_uchar to pcre_uint32 also gave speed
187        improvements.
189    6.  Fix forward search in JIT when link size is 3 or greater. Also removed some
190        unnecessary spaces.
192    7.  Adjust autogen.sh and configure.ac to lose warnings given by automake 1.12
193        and later.
195    8.  Fix two buffer over read issues in 16 and 32 bit modes. Affects JIT only.
197    9.  Optimizing fast_forward_start_bits in JIT.
199    10. Adding support for callouts in JIT, and fixing some issues revealed
200        during this work. Namely:
202        (a) Unoptimized capturing brackets incorrectly reset on backtrack.
204        (b) Minimum length was not checked before the matching is started.
206    11. The value of capture_last that is passed to callouts was incorrect in some
207        cases when there was a capture on one path that was subsequently abandoned
208        after a backtrack. Also, the capture_last value is now reset after a
209        recursion, since all captures are also reset in this case.
211    12. The interpreter no longer returns the "too many substrings" error in the
212        case when an overflowing capture is in a branch that is subsequently
213        abandoned after a backtrack.
215    13. In the pathological case when an offset vector of size 2 is used, pcretest
216        now prints out the matched string after a yield of 0 or 1.
218    14. Inlining subpatterns in recursions, when certain conditions are fulfilled.
219        Only supported by the JIT compiler at the moment.
221    15. JIT compiler now supports 32 bit Macs thanks to Lawrence Velazquez.
223    16. Partial matches now set offsets[2] to the "bumpalong" value, that is, the
224        offset of the starting point of the matching process, provided the offsets
225        vector is large enough.
227    17. The \A escape now records a lookbehind value of 1, though its execution
228        does not actually inspect the previous character. This is to ensure that,
229        in partial multi-segment matching, at least one character from the old
230        segment is retained when a new segment is processed. Otherwise, if there
231        are no lookbehinds in the pattern, \A might match incorrectly at the start
232        of a new segment.
234    18. Added some #ifdef __VMS code into pcretest.c to help VMS implementations.
236    19. Redefined some pcre_uchar variables in pcre_exec.c as pcre_uint32; this
237        gives some modest performance improvement in 8-bit mode.
239    20. Added the PCRE-specific property \p{Xuc} for matching characters that can
240        be expressed in certain programming languages using Universal Character
241        Names.
243    21. Unicode validation has been updated in the light of Unicode Corrigendum #9,
244        which points out that "non characters" are not "characters that may not
245        appear in Unicode strings" but rather "characters that are reserved for
246        internal use and have only local meaning".
248    22. When a pattern was compiled with automatic callouts (PCRE_AUTO_CALLOUT) and
249        there was a conditional group that depended on an assertion, if the
250        assertion was false, the callout that immediately followed the alternation
251        in the condition was skipped when pcre_exec() was used for matching.
253    23. Allow an explicit callout to be inserted before an assertion that is the
254        condition for a conditional group, for compatibility with automatic
255        callouts, which always insert a callout at this point.
257    24. In 8.31, (*COMMIT) was confined to within a recursive subpattern. Perl also
258        confines (*SKIP) and (*PRUNE) in the same way, and this has now been done.
260    25. (*PRUNE) is now supported by the JIT compiler.
262    26. Fix infinite loop when /(?<=(*SKIP)ac)a/ is matched against aa.
264    27. Fix the case where there are two or more SKIPs with arguments that may be
265        ignored.
267    28. (*SKIP) is now supported by the JIT compiler.
269    29. (*THEN) is now supported by the JIT compiler.
271    30. Update RunTest with additional test selector options.
273    31. The way PCRE handles backtracking verbs has been changed in two ways.
275        (1) Previously, in something like (*COMMIT)(*SKIP), COMMIT would override
276        SKIP. Now, PCRE acts on whichever backtracking verb is reached first by
277        backtracking. In some cases this makes it more Perl-compatible, but Perl's
278        rather obscure rules do not always do the same thing.
280        (2) Previously, backtracking verbs were confined within assertions. This is
281        no longer the case for positive assertions, except for (*ACCEPT). Again,
282        this sometimes improves Perl compatibility, and sometimes does not.
284    32. A number of tests that were in test 2 because Perl did things differently
285        have been moved to test 1, because either Perl or PCRE has changed, and
286        these tests are now compatible.
288    32. Backtracking control verbs are now handled in the same way in JIT and
289        interpreter.
291    33. An opening parenthesis in a MARK/PRUNE/SKIP/THEN name in a pattern that
292        contained a forward subroutine reference caused a compile error.
294    34. Auto-detect and optimize limited repetitions in JIT.
296    35. Implement PCRE_NEVER_UTF to lock out the use of UTF, in particular,
297        blocking (*UTF) etc.
299    36. In the interpreter, maximizing pattern repetitions for characters and
300        character types now use tail recursion, which reduces stack usage.
302    37. The value of the max lookbehind was not correctly preserved if a compiled
303        and saved regex was reloaded on a host of different endianness.
305    38. Implemented (*LIMIT_MATCH) and (*LIMIT_RECURSION). As part of the extension
306        of the compiled pattern block, expand the flags field from 16 to 32 bits
307        because it was almost full.
309    39. Try madvise first before posix_madvise.
311    40. Change 7 for PCRE 7.9 made it impossible for pcregrep to find empty lines
312        with a pattern such as ^$. It has taken 4 years for anybody to notice! The
313        original change locked out all matches of empty strings. This has been
314        changed so that one match of an empty string per line is recognized.
315        Subsequent searches on the same line (for colouring or for --only-matching,
316        for example) do not recognize empty strings.
318    41. Applied a user patch to fix a number of spelling mistakes in comments.
320    42. Data lines longer than 65536 caused pcretest to crash.
322    43. Clarified the data type for length and startoffset arguments for pcre_exec
323        and pcre_dfa_exec in the function-specific man pages, where they were
324        explicitly stated to be in bytes, never having been updated. I also added
325        some clarification to the pcreapi man page.
327    44. A call to pcre_dfa_exec() with an output vector size less than 2 caused
328        a segmentation fault.
331    Version 8.32 30-November-2012
332    -----------------------------
334    1.  Improved JIT compiler optimizations for first character search and single
335        character iterators.
337    2.  Supporting IBM XL C compilers for PPC architectures in the JIT compiler.
338        Patch by Daniel Richard G.
340    3.  Single character iterator optimizations in the JIT compiler.
342    4.  Improved JIT compiler optimizations for character ranges.
344    5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
345        Reported by Giuseppe D'Angelo.
347    6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
348        of a line, was being set incorrectly in cases where .* appeared inside
349        atomic brackets at the start of a pattern, or where there was a subsequent
350        *PRUNE or *SKIP.
352    7.  Improved instruction cache flush for POWER/PowerPC.
353        Patch by Daniel Richard G.
355    8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
356        grep:
358        (a) There is now no limit to the number of patterns to be matched.
360        (b) An error is given if a pattern is too long.
362        (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
363            are now supported.
365        (d) --exclude-from and --include-from (multiple use) have been added.
367        (e) Exclusions and inclusions now apply to all files and directories, not
368            just to those obtained from scanning a directory recursively.
370        (f) Multiple uses of -f and --file-list are now supported.
372        (g) In a Windows environment, the default for -d has been changed from
373            "read" (the GNU grep default) to "skip", because otherwise the presence
374            of a directory in the file list provokes an error.
376        (h) The documentation has been revised and clarified in places.
378    9.  Improve the matching speed of capturing brackets.
380    10. Changed the meaning of \X so that it now matches a Unicode extended
381        grapheme cluster.
383    11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
384        out POSIX threads when JIT support is configured.
386    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
388    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
389        structure could go wrong in environments where size_t is not the same size
390        as int.
392    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
393        set.
395    15. The EBCDIC support had decayed; later updates to the code had included
396        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
397        general tidy up of EBCDIC-related issues, and the documentation was also
398        not quite right. There is now a test that can be run on ASCII systems to
399        check some of the EBCDIC-related things (but is it not a full test).
401    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
402        in a small tidy to the code.
404    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
406    18. If the --only-matching (-o) option in pcregrep is specified multiple
407        times, each one causes appropriate output. For example, -o1 -o2 outputs the
408        substrings matched by the 1st and 2nd capturing parentheses. A separating
409        string can be specified by --om-separator (default empty).
411    19. Improving the first n character searches.
413    20. Turn case lists for horizontal and vertical white space into macros so that
414        they are defined only once.
416    21. This set of changes together give more compatible Unicode case-folding
417        behaviour for characters that have more than one other case when UCP
418        support is available.
420        (a) The Unicode property table now has offsets into a new table of sets of
421            three or more characters that are case-equivalent. The MultiStage2.py
422            script that generates these tables (the pcre_ucd.c file) now scans
423            CaseFolding.txt instead of UnicodeData.txt for character case
424            information.
426        (b) The code for adding characters or ranges of characters to a character
427            class has been abstracted into a generalized function that also handles
428            case-independence. In UTF-mode with UCP support, this uses the new data
429            to handle characters with more than one other case.
431        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
432            whose other case is greater than 256 are now correctly matched
433            caselessly. Previously, the high codepoint matched the low one, but not
434            vice versa.
436        (d) The processing of \h, \H, \v, and \ in character classes now makes use
437            of the new class addition function, using character lists defined as
438            macros alongside the case definitions of 20 above.
440        (e) Caseless back references now work with characters that have more than
441            one other case.
443        (f) General caseless matching of characters with more than one other case
444            is supported.
446    22. Unicode character properties were updated from Unicode 6.2.0
448    23. Improved CMake support under Windows. Patch by Daniel Richard G.
450    24. Add support for 32-bit character strings, and UTF-32
452    25. Major JIT compiler update (code refactoring and bugfixing).
453        Experimental Sparc 32 support is added.
455    26. Applied a modified version of Daniel Richard G's patch to create
456        pcre.h.generic and config.h.generic by "make" instead of in the
457        PrepareRelease script.
459    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
460        pcre_compile.c when checking for a zero character.
462    28. Introducing a native interface for JIT. Through this interface, the compiled
463        machine code can be directly executed. The purpose of this interface is to
464        provide fast pattern matching, so several sanity checks are not performed.
465        However, feature tests are still performed. The new interface provides
466        1.4x speedup compared to the old one.
468    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
469        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
470        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
472    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
473        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
474        the "old" RFC 2279). Instead, it ended up passing a negative length to
475        pcre_exec().
477    31. Add support for GCC's visibility feature to hide internal functions.
479    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
480        "unknown -C option" after outputting 0 or 1.
482    33. There is now support for generating a code coverage report for the test
483        suite in environments where gcc is the compiler and lcov is installed. This
484        is mainly for the benefit of the developers.
486    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
487        unaddressable using valgrind annotations, allowing valgrind to detect
488        invalid memory accesses. This is mainly for the benefit of the developers.
490    25. (*UTF) can now be used to start a pattern in any of the three libraries.
492    26. Give configure error if --enable-cpp but no C++ compiler found.
495    Version 8.31 06-July-2012
496    -------------------------
498    1.  Fixing a wrong JIT test case and some compiler warnings.
500    2.  Removed a bashism from the RunTest script.
502    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
503        to unsigned type, result still unsigned" that was given by an MS compiler
504        on encountering the code "-sizeof(xxx)".
506    4.  Partial matching support is added to the JIT compiler.
508    5.  Fixed several bugs concerned with partial matching of items that consist
509        of more than one character:
511        (a) /^(..)\1/ did not partially match "aba" because checking references was
512            done on an "all or nothing" basis. This also applied to repeated
513            references.
515        (b) \R did not give a hard partial match if \r was found at the end of the
516            subject.
518        (c) \X did not give a hard partial match after matching one or more
519            characters at the end of the subject.
521        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
522            a partial match for the string "\r".
524        (e) When newline was set to CRLF, the metacharacter "." did not recognize
525            a partial match for a CR character at the end of the subject string.
527    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
528        running pcretest, the text "(JIT)" added to the output whenever JIT is
529        actually used to run the match.
531    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
532        or /S+[+] with a digit between 1 and 7.
534    8.  OP_NOT now supports any UTF character not just single-byte ones.
536    9.  (*MARK) control verb is now supported by the JIT compiler.
538    10. The command "./RunTest list" lists the available tests without actually
539        running any of them. (Because I keep forgetting what they all are.)
543    12. Applied a (slightly modified) user-supplied patch that improves performance
544        when the heap is used for recursion (compiled with --disable-stack-for-
545        recursion). Instead of malloc and free for each heap frame each time a
546        logical recursion happens, frames are retained on a chain and re-used where
547        possible. This sometimes gives as much as 30% improvement.
549    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
550        call.
552    14. As documented, (*COMMIT) is now confined to within a positive assertion.
554    15. It is now possible to link pcretest with libedit as an alternative to
555        libreadline.
557    16. (*COMMIT) control verb is now supported by the JIT compiler.
559    17. The Unicode data tables have been updated to Unicode 6.1.0.
561    18. Added --file-list option to pcregrep.
563    19. Added binary file support to pcregrep, including the -a, --binary-files,
564        -I, and --text options.
566    20. The madvise function is renamed for posix_madvise for QNX compatibility
567        reasons. Fixed by Giuseppe D'Angelo.
569    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
571    22. Changed the option for creating symbolic links for 16-bit man pages from
572        -s to -sf so that re-installing does not cause issues.
574    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
576    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
577        matches in certain environments (the workspace was not being correctly
578        retained). Also added to pcre_dfa_exec() a simple plausibility check on
579        some of the workspace data at the beginning of a restart.
581    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
582        was not doing so when it should - probably a typo introduced by SVN 528
583        (change 8.10/14).
585    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
586        \w+ when the character tables indicated that \x{c4} was a word character.
587        There were several related cases, all because the tests for doing a table
588        lookup were testing for characters less than 127 instead of 255.
590    27. If a pattern contains capturing parentheses that are not used in a match,
591        their slots in the ovector are set to -1. For those that are higher than
592        any matched groups, this happens at the end of processing. In the case when
593        there were back references that the ovector was too small to contain
594        (causing temporary malloc'd memory to be used during matching), and the
595        highest capturing number was not used, memory off the end of the ovector
596        was incorrectly being set to -1. (It was using the size of the temporary
597        memory instead of the true size.)
599    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
600        ovector size, it uses memory at the end of the block that it has got.
602    29. Check for an overlong MARK name and give an error at compile time. The
603        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
605    30. JIT compiler update.
607    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
608        Rill for the patch.
610    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
612    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
614    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
615        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
616        was enabled.
618    35. Improve JIT code generation for greedy plus quantifier.
620    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
621        1 to "aa" instead of to an empty string. The bug affected repeated groups
622        that could potentially match an empty string.
624    37. Optimizing single character iterators in JIT.
626    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
627        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
628        codepoints that are too big for the mode are faulted, and in a UTF mode,
629        disallowed codepoints are also faulted.
631    39. If PCRE was compiled with UTF support, in three places in the DFA
632        matcher there was code that should only have been obeyed in UTF mode, but
633        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
634        processing when bytes with values greater than 127 were present. In 16-bit
635        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
636        both cases the values are those that cannot be the first data item in a UTF
637        character. The three items that might have provoked this were recursions,
638        possessively repeated groups, and atomic groups.
640    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
641        and pcregrep, because some OS require shared objects to be explicitly
642        passed to ld, causing the link step to fail if they are not.
644    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
645        mode, patterns that started with \h* or \R* might be incorrectly matched.
648    Version 8.30 04-February-2012
649    -----------------------------
651    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
652        name is defined in ctype.h.
654    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
655        only in quite long subpatterns.
657    3.  Removed the function pcre_info(), which has been obsolete and deprecated
658        since it was replaced by pcre_fullinfo() in February 2000.
660    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
661        match a (*MARK), and the match failed at the start of the subject, a
662        reference to memory before the start of the subject could occur. This bug
663        was introduced by fix 17 of release 8.21.
665    5.  A reference to an unset group with zero minimum repetition was giving
666        totally wrong answers (in non-JavaScript-compatibility mode). For example,
667        /(another)?(\1?)test/ matched against "hello world test". This bug was
668        introduced in release 8.13.
670    6.  Add support for 16-bit character strings (a large amount of work involving
671        many changes and refactorings).
673    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
674        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
675        from a file.
677    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
678        rounding is not applied in this particular case).
680    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
681        if they appear, or are escaped, in patterns.
683    10. Get rid of a number of -Wunused-but-set-variable warnings.
685    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
686        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
687        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
688        also returns the mark "x". This bug applied to capturing parentheses,
689        non-capturing parentheses, and atomic parentheses. It also applied to some
690        assertions.
692    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
693        information out of configure.ac instead of relying on pcre.h.generic, which
694        is not stored in the repository.
696    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
697        -lreadline.
699    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
701    15. Applied Graycode's patch to put the top-level frame on the stack rather
702        than the heap when not using the stack for recursion. This gives a
703        performance improvement in many cases when recursion is not deep.
705    16. Experimental code added to "pcretest -C" to output the stack frame size.
708    Version 8.21 12-Dec-2011
709    ------------------------
711    1.  Updating the JIT compiler.
713    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
714        are added as well.
716    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
717        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
718        calling _pcre_jit_exec. Some extra comments are added.
720    4.  (*MARK) settings inside atomic groups that do not contain any capturing
721        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
722        was introduced by change 18 for 8.20.
724    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
725        ECMA-262 standard.
727    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
728        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
729        This bug was probably introduced by change 9 of 8.13.
731    7.  While fixing 6 above, I noticed that a number of other items were being
732        incorrectly rejected as "not fixed length". This arose partly because newer
733        opcodes had not been added to the fixed-length checking code. I have (a)
734        corrected the bug and added tests for these items, and (b) arranged for an
735        error to occur if an unknown opcode is encountered while checking for fixed
736        length instead of just assuming "not fixed length". The items that were
737        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
738        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
739        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
741    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
742        being incorrectly compiled and would have given unpredicatble results.
744    9.  A possessively repeated subpattern with minimum repeat count greater than
745        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
746        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
747        the first (A) could occur when it should not.
749    10. Add a cast and remove a redundant test from the code.
751    11. JIT should use pcre_malloc/pcre_free for allocation.
753    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
754        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
755        is anything other than /usr, -L is still shown).
757    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
759    14. Perl does not support \N without a following name in a [] class; PCRE now
760        also gives an error.
762    15. If a forward reference was repeated with an upper limit of around 2000,
763        it caused the error "internal error: overran compiling workspace". The
764        maximum number of forward references (including repeats) was limited by the
765        internal workspace, and dependent on the LINK_SIZE. The code has been
766        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
767        the default depends on LINK_SIZE. There is a new upper limit (for safety)
768        of around 200,000 forward references. While doing this, I also speeded up
769        the filling in of repeated forward references.
771    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
772        incorrectly expecting the subject to contain another "a" after the start.
774    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
775        in the match, the SKIP should be ignored. This was not happening; instead
776        the SKIP was being treated as NOMATCH. For patterns such as
777        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
778        tested.
780    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
781        now much more compatible with Perl, in particular in cases where the result
782        is a non-match for a non-anchored pattern. For example, if
783        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
784        "m", where previously it did not return a name. A side effect of this
785        change is that for partial matches, the last encountered mark name is
786        returned, as for non matches. A number of tests that were previously not
787        Perl-compatible have been moved into the Perl-compatible test files. The
788        refactoring has had the pleasing side effect of removing one argument from
789        the match() function, thus reducing its stack requirements.
791    19. If the /S+ option was used in pcretest to study a pattern using JIT,
792        subsequent uses of /S (without +) incorrectly behaved like /S+.
794    21. Retrieve executable code size support for the JIT compiler and fixing
795        some warnings.
797    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
798        not work when the shorter character appeared right at the end of the
799        subject string.
801    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
802        systems.
804    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
805        output it when the /M option is used in pcretest.
807    25. The CheckMan script was not being included in the distribution. Also, added
808        an explicit "perl" to run Perl scripts from the PrepareRelease script
809        because this is reportedly needed in Windows.
811    26. If study data was being save in a file and studying had not found a set of
812        "starts with" bytes for the pattern, the data written to the file (though
813        never used) was taken from uninitialized memory and so caused valgrind to
814        complain.
816    27. Updated RunTest.bat as provided by Sheri Pierce.
818    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
820    29. Computation of memory usage for the table of capturing group names was
821        giving an unnecessarily large value.
824    Version 8.20 21-Oct-2011
825    ------------------------
827    1.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had
828        a POSIX class. After further experiments with Perl, which convinced me that
829        Perl has bugs and confusions, a closing square bracket is no longer allowed
830        in a POSIX name. This bug also affected patterns with classes that started
831        with full stops.
833    2.  If a pattern such as /(a)b|ac/ is matched against "ac", there is no
834        captured substring, but while checking the failing first alternative,
835        substring 1 is temporarily captured. If the output vector supplied to
836        pcre_exec() was not big enough for this capture, the yield of the function
837        was still zero ("insufficient space for captured substrings"). This cannot
838        be totally fixed without adding another stack variable, which seems a lot
839        of expense for a edge case. However, I have improved the situation in cases
840        such as /(a)(b)x|abc/ matched against "abc", where the return code
841        indicates that fewer than the maximum number of slots in the ovector have
842        been set.
844    3.  Related to (2) above: when there are more back references in a pattern than
845        slots in the output vector, pcre_exec() uses temporary memory during
846        matching, and copies in the captures as far as possible afterwards. It was
847        using the entire output vector, but this conflicts with the specification
848        that only 2/3 is used for passing back captured substrings. Now it uses
849        only the first 2/3, for compatibility. This is, of course, another edge
850        case.
852    4.  Zoltan Herczeg's just-in-time compiler support has been integrated into the
853        main code base, and can be used by building with --enable-jit. When this is
854        done, pcregrep automatically uses it unless --disable-pcregrep-jit or the
855        runtime --no-jit option is given.
857    5.  When the number of matches in a pcre_dfa_exec() run exactly filled the
858        ovector, the return from the function was zero, implying that there were
859        other matches that did not fit. The correct "exactly full" value is now
860        returned.
862    6.  If a subpattern that was called recursively or as a subroutine contained
863        (*PRUNE) or any other control that caused it to give a non-standard return,
864        invalid errors such as "Error -26 (nested recursion at the same subject
865        position)" or even infinite loops could occur.
867    7.  If a pattern such as /a(*SKIP)c|b(*ACCEPT)|/ was studied, it stopped
868        computing the minimum length on reaching *ACCEPT, and so ended up with the
869        wrong value of 1 rather than 0. Further investigation indicates that
870        computing a minimum subject length in the presence of *ACCEPT is difficult
871        (think back references, subroutine calls), and so I have changed the code
872        so that no minimum is registered for a pattern that contains *ACCEPT.
874    8.  If (*THEN) was present in the first (true) branch of a conditional group,
875        it was not handled as intended. [But see 16 below.]
877    9.  Replaced RunTest.bat and CMakeLists.txt with improved versions provided by
878        Sheri Pierce.
880    10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that
881        the first byte in a match must be "a".
883    11. Change 17 for 8.13 increased the recursion depth for patterns like
884        /a(?:.)*?a/ drastically. I've improved things by remembering whether a
885        pattern contains any instances of (*THEN). If it does not, the old
886        optimizations are restored. It would be nice to do this on a per-group
887        basis, but at the moment that is not feasible.
889    12. In some environments, the output of pcretest -C is CRLF terminated. This
890        broke RunTest's code that checks for the link size. A single white space
891        character after the value is now allowed for.
893    13. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".
894        For "fr", it uses the Windows-specific input and output files.
896    14. If (*THEN) appeared in a group that was called recursively or as a
897        subroutine, it did not work as intended. [But see next item.]
899    15. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex
900        pattern fragments (but not containing any | characters). If A and B are
901        matched, but there is a failure in C so that it backtracks to (*THEN), PCRE
902        was behaving differently to Perl. PCRE backtracked into A, but Perl goes to
903        D. In other words, Perl considers parentheses that do not contain any |
904        characters to be part of a surrounding alternative, whereas PCRE was
905        treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles
906        differently. PCRE now behaves in the same way as Perl, except in the case
907        of subroutine/recursion calls such as (?1) which have in any case always
908        been different (but PCRE had them first :-).
910    16. Related to 15 above: Perl does not treat the | in a conditional group as
911        creating alternatives. Such a group is treated in the same way as an
912        ordinary group without any | characters when processing (*THEN). PCRE has
913        been changed to match Perl's behaviour.
915    17. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the
916        RunGrepTest script failed.
918    18. Change 22 for version 13 caused atomic groups to use more stack. This is
919        inevitable for groups that contain captures, but it can lead to a lot of
920        stack use in large patterns. The old behaviour has been restored for atomic
921        groups that do not contain any capturing parentheses.
923    19. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not
924        suppress the check for a minimum subject length at run time. (If it was
925        given to pcre_exec() or pcre_dfa_exec() it did work.)
927    20. Fixed an ASCII-dependent infelicity in pcretest that would have made it
928        fail to work when decoding hex characters in data strings in EBCDIC
929        environments.
931    21. It appears that in at least one Mac OS environment, the isxdigit() function
932        is implemented as a macro that evaluates to its argument more than once,
933        contravening the C 90 Standard (I haven't checked a later standard). There
934        was an instance in pcretest which caused it to go wrong when processing
935        \x{...} escapes in subject strings. The has been rewritten to avoid using
936        things like p++ in the argument of isxdigit().
939    Version 8.13 16-Aug-2011
940  ------------------------  ------------------------
942  1.  The Unicode data tables have been updated to Unicode 6.0.0.  1.  The Unicode data tables have been updated to Unicode 6.0.0.
# Line 98  Version 8.13 02-Aug-2011 Line 1033  Version 8.13 02-Aug-2011
1033      tail recursion to cut down on stack usage. Unfortunately, now that there is      tail recursion to cut down on stack usage. Unfortunately, now that there is
1034      the possibility of (*THEN) occurring in these branches, tail recursion is      the possibility of (*THEN) occurring in these branches, tail recursion is
1035      no longer possible because the return has to be checked for (*THEN). These      no longer possible because the return has to be checked for (*THEN). These
1036      two optimizations have therefore been removed.      two optimizations have therefore been removed. [But see 8.20/11 above.]
1038  18. If a pattern containing \R was studied, it was assumed that \R always  18. If a pattern containing \R was studied, it was assumed that \R always
1039      matched two bytes, thus causing the minimum subject length to be      matched two bytes, thus causing the minimum subject length to be
# Line 189  Version 8.13 02-Aug-2011 Line 1124  Version 8.13 02-Aug-2011
1124      For example, [:a[:digit:]b:] matches "a", "b", ":", or a digit. Also,      For example, [:a[:digit:]b:] matches "a", "b", ":", or a digit. Also,
1125      unescaped square brackets may also appear as part of class names. For      unescaped square brackets may also appear as part of class names. For
1126      example, [:a[:abc]b:] gives unknown class "[:abc]b:]". PCRE now behaves      example, [:a[:abc]b:] gives unknown class "[:abc]b:]". PCRE now behaves
1127      more like Perl.      more like Perl. (But see 8.20/1 above.)
1129  38. PCRE was giving an error for \N with a braced quantifier such as {1,} (this  38. PCRE was giving an error for \N with a braced quantifier such as {1,} (this
1130      was because it thought it was \N{name}, which is not supported).      was because it thought it was \N{name}, which is not supported).
# Line 224  Version 8.13 02-Aug-2011 Line 1159  Version 8.13 02-Aug-2011
1159      (a) The default value of the buffer size parameter has been increased from      (a) The default value of the buffer size parameter has been increased from
1160          8K to 20K. (The actual buffer used is three times this size.)          8K to 20K. (The actual buffer used is three times this size.)
1162      (b) The default can be changed by ./configure --with-pcregrep-bufsiz when      (b) The default can be changed by ./configure --with-pcregrep-bufsize when
1163          PCRE is built.          PCRE is built.
1165      (c) A --buffer-size=n option has been added to pcregrep, to allow the size      (c) A --buffer-size=n option has been added to pcregrep, to allow the size
# Line 245  Version 8.13 02-Aug-2011 Line 1180  Version 8.13 02-Aug-2011
1180  47. The pattern /f.*/8s, when applied to "for" with PCRE_PARTIAL_HARD, gave a  47. The pattern /f.*/8s, when applied to "for" with PCRE_PARTIAL_HARD, gave a
1181      complete match instead of a partial match. This bug was dependent on both      complete match instead of a partial match. This bug was dependent on both
1182      the PCRE_UTF8 and PCRE_DOTALL options being set.      the PCRE_UTF8 and PCRE_DOTALL options being set.
1184  48. For a pattern such as /\babc|\bdef/ pcre_study() was failing to set up the  48. For a pattern such as /\babc|\bdef/ pcre_study() was failing to set up the
1185      starting byte set, because \b was not being ignored.      starting byte set, because \b was not being ignored.
1188  Version 8.12 15-Jan-2011  Version 8.12 15-Jan-2011
# Line 900  Version 7.9 11-Apr-09 Line 1835  Version 7.9 11-Apr-09
1835  7.  A pattern that could match an empty string could cause pcregrep to loop; it  7.  A pattern that could match an empty string could cause pcregrep to loop; it
1836      doesn't make sense to accept an empty string match in pcregrep, so I have      doesn't make sense to accept an empty string match in pcregrep, so I have
1837      locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this      locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
1838      seems to be how GNU grep behaves.      seems to be how GNU grep behaves. [But see later change 40 for release
1839        8.33.]
1841  8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at  8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
1842      start or after a newline", because the conditional assertion was not being      start or after a newline", because the conditional assertion was not being
# Line 1143  Version 7.7 07-May-08 Line 2079  Version 7.7 07-May-08
2079      containing () gave an internal compiling error instead of "reference to      containing () gave an internal compiling error instead of "reference to
2080      non-existent subpattern". Fortunately, when the pattern did exist, the      non-existent subpattern". Fortunately, when the pattern did exist, the
2081      compiled code was correct. (When scanning forwards to check for the      compiled code was correct. (When scanning forwards to check for the
2082      existencd of the subpattern, it was treating the data ']' as terminating      existence of the subpattern, it was treating the data ']' as terminating
2083      the class, so got the count wrong. When actually compiling, the reference      the class, so got the count wrong. When actually compiling, the reference
2084      was subsequently set up correctly.)      was subsequently set up correctly.)

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