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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 7.5 12-Nov-07  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. It can also be set by
90        (*NO_AUTO_POSSESS) at the start of a pattern.
92    18. The character VT has been added to the set of characters that match \s and
93        are generally treated as white space, following this same change in Perl
94        5.18. There is now no difference between "Perl space" and "POSIX space".
96    19. The code for checking named groups as conditions, either for being set or
97        for being recursed, has been refactored (this is related to 14 and 15
98        above). Processing unduplicated named groups should now be as fast at
99        numerical groups, and processing duplicated groups should be faster than
100        before.
102    20. Two patches to the CMake build system, by Alexander Barkov:
104          (1) Replace the "source" command by "." in CMakeLists.txt because
105              "source" is a bash-ism.
107          (2) Add missing HAVE_STDINT_H and HAVE_INTTYPES_H to config-cmake.h.in;
108              without these the CMake build does not work on Solaris.
110    21. Perl has changed its handling of \8 and \9. If there is no previously
111        encountered capturing group of those numbers, they are treated as the
112        literal characters 8 and 9 instead of a binary zero followed by the
113        literals. PCRE now does the same.
115    22. Following Perl, added \o{} to specify codepoints in octal, making it
116        possible to specify values greater than 0777 and also making them
117        unambiguous.
119    23. Perl now gives an error for missing closing braces after \x{... instead of
120        treating the string as literal. PCRE now does the same.
122    24. RunTest used to grumble if an inappropriate test was selected explicitly,
123        but just skip it when running all tests. This make it awkward to run ranges
124        of tests when one of them was inappropriate. Now it just skips any
125        inappropriate tests, as it always did when running all tests.
127    25. If PCRE_AUTO_CALLOUT and PCRE_UCP were set for a pattern that contained
128        character types such as \d or \w, too many callouts were inserted, and the
129        data that they returned was rubbish.
131    26. In UCP mode, \s was not matching two of the characters that Perl matches,
132        namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they
133        were matched by \h. The code has now been refactored so that the lists of
134        the horizontal and vertical whitespace characters used for \h and \v (which
135        are defined only in one place) are now also used for \s.
137    27. Add JIT support for the 64 bit TileGX architecture.
138        Patch by Jiong Wang (Tilera Corporation).
140    28. Possessive quantifiers for classes (both explicit and automatically
141        generated) now use special opcodes instead of wrapping in ONCE brackets.
143    29. Whereas an item such as A{4}+ ignored the possessivenes of the quantifier
144        (because it's meaningless), this was not happening when PCRE_CASELESS was
145        set. Not wrong, but inefficient.
147    30. Updated perltest.pl to add /u (force Unicode mode) when /W (use Unicode
148        properties for \w, \d, etc) is present in a test regex. Otherwise if the
149        test contains no characters greater than 255, Perl doesn't realise it
150        should be using Unicode semantics.
152    31. Upgraded the handling of the POSIX classes [:graph:], [:print:], and
153        [:punct:] when PCRE_UCP is set so as to include the same characters as Perl
154        does in Unicode mode.
156    32. Added the "forbid" facility to pcretest so that putting tests into the
157        wrong test files can sometimes be quickly detected.
159    33. There is now a limit (default 250) on the depth of nesting of parentheses.
160        This limit is imposed to control the amount of system stack used at compile
161        time. It can be changed at build time by --with-parens-nest-limit=xxx or
162        the equivalent in CMake.
164    34. Character classes such as [A-\d] or [a-[:digit:]] now cause compile-time
165        errors. Perl warns for these when in warning mode, but PCRE has no facility
166        for giving warnings.
168    35. Change 34 for 8.13 allowed quantifiers on assertions, because Perl does.
169        However, this was not working for (?!) because it is optimized to (*FAIL),
170        for which PCRE does not allow quantifiers. The optimization is now disabled
171        when a quantifier follows (?!). I can't see any use for this, but it makes
172        things uniform.
174    36. Perl no longer allows group names to start with digits, so I have made this
175        change also in PCRE. It simplifies the code a bit.
177    37. In extended mode, Perl ignores spaces before a + that indicates a
178        possessive quantifier. PCRE allowed a space before the quantifier, but not
179        before the possessive +. It now does.
182    Version 8.33 28-May-2013
183    ------------------------
185    1.  Added 'U' to some constants that are compared to unsigned integers, to
186        avoid compiler signed/unsigned warnings. Added (int) casts to unsigned
187        variables that are added to signed variables, to ensure the result is
188        signed and can be negated.
190    2.  Applied patch by Daniel Richard G for quashing MSVC warnings to the
191        CMake config files.
193    3.  Revise the creation of config.h.generic so that all boolean macros are
194        #undefined, whereas non-boolean macros are #ifndef/#endif-ed. This makes
195        overriding via -D on the command line possible.
197    4.  Changing the definition of the variable "op" in pcre_exec.c from pcre_uchar
198        to unsigned int is reported to make a quite noticeable speed difference in
199        a specific Windows environment. Testing on Linux did also appear to show
200        some benefit (and it is clearly not harmful). Also fixed the definition of
201        Xop which should be unsigned.
203    5.  Related to (4), changing the definition of the intermediate variable cc
204        in repeated character loops from pcre_uchar to pcre_uint32 also gave speed
205        improvements.
207    6.  Fix forward search in JIT when link size is 3 or greater. Also removed some
208        unnecessary spaces.
210    7.  Adjust autogen.sh and configure.ac to lose warnings given by automake 1.12
211        and later.
213    8.  Fix two buffer over read issues in 16 and 32 bit modes. Affects JIT only.
215    9.  Optimizing fast_forward_start_bits in JIT.
217    10. Adding support for callouts in JIT, and fixing some issues revealed
218        during this work. Namely:
220        (a) Unoptimized capturing brackets incorrectly reset on backtrack.
222        (b) Minimum length was not checked before the matching is started.
224    11. The value of capture_last that is passed to callouts was incorrect in some
225        cases when there was a capture on one path that was subsequently abandoned
226        after a backtrack. Also, the capture_last value is now reset after a
227        recursion, since all captures are also reset in this case.
229    12. The interpreter no longer returns the "too many substrings" error in the
230        case when an overflowing capture is in a branch that is subsequently
231        abandoned after a backtrack.
233    13. In the pathological case when an offset vector of size 2 is used, pcretest
234        now prints out the matched string after a yield of 0 or 1.
236    14. Inlining subpatterns in recursions, when certain conditions are fulfilled.
237        Only supported by the JIT compiler at the moment.
239    15. JIT compiler now supports 32 bit Macs thanks to Lawrence Velazquez.
241    16. Partial matches now set offsets[2] to the "bumpalong" value, that is, the
242        offset of the starting point of the matching process, provided the offsets
243        vector is large enough.
245    17. The \A escape now records a lookbehind value of 1, though its execution
246        does not actually inspect the previous character. This is to ensure that,
247        in partial multi-segment matching, at least one character from the old
248        segment is retained when a new segment is processed. Otherwise, if there
249        are no lookbehinds in the pattern, \A might match incorrectly at the start
250        of a new segment.
252    18. Added some #ifdef __VMS code into pcretest.c to help VMS implementations.
254    19. Redefined some pcre_uchar variables in pcre_exec.c as pcre_uint32; this
255        gives some modest performance improvement in 8-bit mode.
257    20. Added the PCRE-specific property \p{Xuc} for matching characters that can
258        be expressed in certain programming languages using Universal Character
259        Names.
261    21. Unicode validation has been updated in the light of Unicode Corrigendum #9,
262        which points out that "non characters" are not "characters that may not
263        appear in Unicode strings" but rather "characters that are reserved for
264        internal use and have only local meaning".
266    22. When a pattern was compiled with automatic callouts (PCRE_AUTO_CALLOUT) and
267        there was a conditional group that depended on an assertion, if the
268        assertion was false, the callout that immediately followed the alternation
269        in the condition was skipped when pcre_exec() was used for matching.
271    23. Allow an explicit callout to be inserted before an assertion that is the
272        condition for a conditional group, for compatibility with automatic
273        callouts, which always insert a callout at this point.
275    24. In 8.31, (*COMMIT) was confined to within a recursive subpattern. Perl also
276        confines (*SKIP) and (*PRUNE) in the same way, and this has now been done.
278    25. (*PRUNE) is now supported by the JIT compiler.
280    26. Fix infinite loop when /(?<=(*SKIP)ac)a/ is matched against aa.
282    27. Fix the case where there are two or more SKIPs with arguments that may be
283        ignored.
285    28. (*SKIP) is now supported by the JIT compiler.
287    29. (*THEN) is now supported by the JIT compiler.
289    30. Update RunTest with additional test selector options.
291    31. The way PCRE handles backtracking verbs has been changed in two ways.
293        (1) Previously, in something like (*COMMIT)(*SKIP), COMMIT would override
294        SKIP. Now, PCRE acts on whichever backtracking verb is reached first by
295        backtracking. In some cases this makes it more Perl-compatible, but Perl's
296        rather obscure rules do not always do the same thing.
298        (2) Previously, backtracking verbs were confined within assertions. This is
299        no longer the case for positive assertions, except for (*ACCEPT). Again,
300        this sometimes improves Perl compatibility, and sometimes does not.
302    32. A number of tests that were in test 2 because Perl did things differently
303        have been moved to test 1, because either Perl or PCRE has changed, and
304        these tests are now compatible.
306    32. Backtracking control verbs are now handled in the same way in JIT and
307        interpreter.
309    33. An opening parenthesis in a MARK/PRUNE/SKIP/THEN name in a pattern that
310        contained a forward subroutine reference caused a compile error.
312    34. Auto-detect and optimize limited repetitions in JIT.
314    35. Implement PCRE_NEVER_UTF to lock out the use of UTF, in particular,
315        blocking (*UTF) etc.
317    36. In the interpreter, maximizing pattern repetitions for characters and
318        character types now use tail recursion, which reduces stack usage.
320    37. The value of the max lookbehind was not correctly preserved if a compiled
321        and saved regex was reloaded on a host of different endianness.
323    38. Implemented (*LIMIT_MATCH) and (*LIMIT_RECURSION). As part of the extension
324        of the compiled pattern block, expand the flags field from 16 to 32 bits
325        because it was almost full.
327    39. Try madvise first before posix_madvise.
329    40. Change 7 for PCRE 7.9 made it impossible for pcregrep to find empty lines
330        with a pattern such as ^$. It has taken 4 years for anybody to notice! The
331        original change locked out all matches of empty strings. This has been
332        changed so that one match of an empty string per line is recognized.
333        Subsequent searches on the same line (for colouring or for --only-matching,
334        for example) do not recognize empty strings.
336    41. Applied a user patch to fix a number of spelling mistakes in comments.
338    42. Data lines longer than 65536 caused pcretest to crash.
340    43. Clarified the data type for length and startoffset arguments for pcre_exec
341        and pcre_dfa_exec in the function-specific man pages, where they were
342        explicitly stated to be in bytes, never having been updated. I also added
343        some clarification to the pcreapi man page.
345    44. A call to pcre_dfa_exec() with an output vector size less than 2 caused
346        a segmentation fault.
349    Version 8.32 30-November-2012
350    -----------------------------
352    1.  Improved JIT compiler optimizations for first character search and single
353        character iterators.
355    2.  Supporting IBM XL C compilers for PPC architectures in the JIT compiler.
356        Patch by Daniel Richard G.
358    3.  Single character iterator optimizations in the JIT compiler.
360    4.  Improved JIT compiler optimizations for character ranges.
362    5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
363        Reported by Giuseppe D'Angelo.
365    6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
366        of a line, was being set incorrectly in cases where .* appeared inside
367        atomic brackets at the start of a pattern, or where there was a subsequent
368        *PRUNE or *SKIP.
370    7.  Improved instruction cache flush for POWER/PowerPC.
371        Patch by Daniel Richard G.
373    8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
374        grep:
376        (a) There is now no limit to the number of patterns to be matched.
378        (b) An error is given if a pattern is too long.
380        (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
381            are now supported.
383        (d) --exclude-from and --include-from (multiple use) have been added.
385        (e) Exclusions and inclusions now apply to all files and directories, not
386            just to those obtained from scanning a directory recursively.
388        (f) Multiple uses of -f and --file-list are now supported.
390        (g) In a Windows environment, the default for -d has been changed from
391            "read" (the GNU grep default) to "skip", because otherwise the presence
392            of a directory in the file list provokes an error.
394        (h) The documentation has been revised and clarified in places.
396    9.  Improve the matching speed of capturing brackets.
398    10. Changed the meaning of \X so that it now matches a Unicode extended
399        grapheme cluster.
401    11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
402        out POSIX threads when JIT support is configured.
404    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
406    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
407        structure could go wrong in environments where size_t is not the same size
408        as int.
410    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
411        set.
413    15. The EBCDIC support had decayed; later updates to the code had included
414        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
415        general tidy up of EBCDIC-related issues, and the documentation was also
416        not quite right. There is now a test that can be run on ASCII systems to
417        check some of the EBCDIC-related things (but is it not a full test).
419    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
420        in a small tidy to the code.
422    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
424    18. If the --only-matching (-o) option in pcregrep is specified multiple
425        times, each one causes appropriate output. For example, -o1 -o2 outputs the
426        substrings matched by the 1st and 2nd capturing parentheses. A separating
427        string can be specified by --om-separator (default empty).
429    19. Improving the first n character searches.
431    20. Turn case lists for horizontal and vertical white space into macros so that
432        they are defined only once.
434    21. This set of changes together give more compatible Unicode case-folding
435        behaviour for characters that have more than one other case when UCP
436        support is available.
438        (a) The Unicode property table now has offsets into a new table of sets of
439            three or more characters that are case-equivalent. The MultiStage2.py
440            script that generates these tables (the pcre_ucd.c file) now scans
441            CaseFolding.txt instead of UnicodeData.txt for character case
442            information.
444        (b) The code for adding characters or ranges of characters to a character
445            class has been abstracted into a generalized function that also handles
446            case-independence. In UTF-mode with UCP support, this uses the new data
447            to handle characters with more than one other case.
449        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
450            whose other case is greater than 256 are now correctly matched
451            caselessly. Previously, the high codepoint matched the low one, but not
452            vice versa.
454        (d) The processing of \h, \H, \v, and \ in character classes now makes use
455            of the new class addition function, using character lists defined as
456            macros alongside the case definitions of 20 above.
458        (e) Caseless back references now work with characters that have more than
459            one other case.
461        (f) General caseless matching of characters with more than one other case
462            is supported.
464    22. Unicode character properties were updated from Unicode 6.2.0
466    23. Improved CMake support under Windows. Patch by Daniel Richard G.
468    24. Add support for 32-bit character strings, and UTF-32
470    25. Major JIT compiler update (code refactoring and bugfixing).
471        Experimental Sparc 32 support is added.
473    26. Applied a modified version of Daniel Richard G's patch to create
474        pcre.h.generic and config.h.generic by "make" instead of in the
475        PrepareRelease script.
477    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
478        pcre_compile.c when checking for a zero character.
480    28. Introducing a native interface for JIT. Through this interface, the compiled
481        machine code can be directly executed. The purpose of this interface is to
482        provide fast pattern matching, so several sanity checks are not performed.
483        However, feature tests are still performed. The new interface provides
484        1.4x speedup compared to the old one.
486    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
487        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
488        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
490    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
491        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
492        the "old" RFC 2279). Instead, it ended up passing a negative length to
493        pcre_exec().
495    31. Add support for GCC's visibility feature to hide internal functions.
497    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
498        "unknown -C option" after outputting 0 or 1.
500    33. There is now support for generating a code coverage report for the test
501        suite in environments where gcc is the compiler and lcov is installed. This
502        is mainly for the benefit of the developers.
504    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
505        unaddressable using valgrind annotations, allowing valgrind to detect
506        invalid memory accesses. This is mainly for the benefit of the developers.
508    25. (*UTF) can now be used to start a pattern in any of the three libraries.
510    26. Give configure error if --enable-cpp but no C++ compiler found.
513    Version 8.31 06-July-2012
514    -------------------------
516    1.  Fixing a wrong JIT test case and some compiler warnings.
518    2.  Removed a bashism from the RunTest script.
520    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
521        to unsigned type, result still unsigned" that was given by an MS compiler
522        on encountering the code "-sizeof(xxx)".
524    4.  Partial matching support is added to the JIT compiler.
526    5.  Fixed several bugs concerned with partial matching of items that consist
527        of more than one character:
529        (a) /^(..)\1/ did not partially match "aba" because checking references was
530            done on an "all or nothing" basis. This also applied to repeated
531            references.
533        (b) \R did not give a hard partial match if \r was found at the end of the
534            subject.
536        (c) \X did not give a hard partial match after matching one or more
537            characters at the end of the subject.
539        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
540            a partial match for the string "\r".
542        (e) When newline was set to CRLF, the metacharacter "." did not recognize
543            a partial match for a CR character at the end of the subject string.
545    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
546        running pcretest, the text "(JIT)" added to the output whenever JIT is
547        actually used to run the match.
549    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
550        or /S+[+] with a digit between 1 and 7.
552    8.  OP_NOT now supports any UTF character not just single-byte ones.
554    9.  (*MARK) control verb is now supported by the JIT compiler.
556    10. The command "./RunTest list" lists the available tests without actually
557        running any of them. (Because I keep forgetting what they all are.)
561    12. Applied a (slightly modified) user-supplied patch that improves performance
562        when the heap is used for recursion (compiled with --disable-stack-for-
563        recursion). Instead of malloc and free for each heap frame each time a
564        logical recursion happens, frames are retained on a chain and re-used where
565        possible. This sometimes gives as much as 30% improvement.
567    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
568        call.
570    14. As documented, (*COMMIT) is now confined to within a positive assertion.
572    15. It is now possible to link pcretest with libedit as an alternative to
573        libreadline.
575    16. (*COMMIT) control verb is now supported by the JIT compiler.
577    17. The Unicode data tables have been updated to Unicode 6.1.0.
579    18. Added --file-list option to pcregrep.
581    19. Added binary file support to pcregrep, including the -a, --binary-files,
582        -I, and --text options.
584    20. The madvise function is renamed for posix_madvise for QNX compatibility
585        reasons. Fixed by Giuseppe D'Angelo.
587    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
589    22. Changed the option for creating symbolic links for 16-bit man pages from
590        -s to -sf so that re-installing does not cause issues.
592    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
594    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
595        matches in certain environments (the workspace was not being correctly
596        retained). Also added to pcre_dfa_exec() a simple plausibility check on
597        some of the workspace data at the beginning of a restart.
599    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
600        was not doing so when it should - probably a typo introduced by SVN 528
601        (change 8.10/14).
603    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
604        \w+ when the character tables indicated that \x{c4} was a word character.
605        There were several related cases, all because the tests for doing a table
606        lookup were testing for characters less than 127 instead of 255.
608    27. If a pattern contains capturing parentheses that are not used in a match,
609        their slots in the ovector are set to -1. For those that are higher than
610        any matched groups, this happens at the end of processing. In the case when
611        there were back references that the ovector was too small to contain
612        (causing temporary malloc'd memory to be used during matching), and the
613        highest capturing number was not used, memory off the end of the ovector
614        was incorrectly being set to -1. (It was using the size of the temporary
615        memory instead of the true size.)
617    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
618        ovector size, it uses memory at the end of the block that it has got.
620    29. Check for an overlong MARK name and give an error at compile time. The
621        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
623    30. JIT compiler update.
625    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
626        Rill for the patch.
628    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
630    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
632    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
633        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
634        was enabled.
636    35. Improve JIT code generation for greedy plus quantifier.
638    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
639        1 to "aa" instead of to an empty string. The bug affected repeated groups
640        that could potentially match an empty string.
642    37. Optimizing single character iterators in JIT.
644    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
645        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
646        codepoints that are too big for the mode are faulted, and in a UTF mode,
647        disallowed codepoints are also faulted.
649    39. If PCRE was compiled with UTF support, in three places in the DFA
650        matcher there was code that should only have been obeyed in UTF mode, but
651        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
652        processing when bytes with values greater than 127 were present. In 16-bit
653        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
654        both cases the values are those that cannot be the first data item in a UTF
655        character. The three items that might have provoked this were recursions,
656        possessively repeated groups, and atomic groups.
658    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
659        and pcregrep, because some OS require shared objects to be explicitly
660        passed to ld, causing the link step to fail if they are not.
662    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
663        mode, patterns that started with \h* or \R* might be incorrectly matched.
666    Version 8.30 04-February-2012
667    -----------------------------
669    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
670        name is defined in ctype.h.
672    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
673        only in quite long subpatterns.
675    3.  Removed the function pcre_info(), which has been obsolete and deprecated
676        since it was replaced by pcre_fullinfo() in February 2000.
678    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
679        match a (*MARK), and the match failed at the start of the subject, a
680        reference to memory before the start of the subject could occur. This bug
681        was introduced by fix 17 of release 8.21.
683    5.  A reference to an unset group with zero minimum repetition was giving
684        totally wrong answers (in non-JavaScript-compatibility mode). For example,
685        /(another)?(\1?)test/ matched against "hello world test". This bug was
686        introduced in release 8.13.
688    6.  Add support for 16-bit character strings (a large amount of work involving
689        many changes and refactorings).
691    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
692        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
693        from a file.
695    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
696        rounding is not applied in this particular case).
698    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
699        if they appear, or are escaped, in patterns.
701    10. Get rid of a number of -Wunused-but-set-variable warnings.
703    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
704        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
705        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
706        also returns the mark "x". This bug applied to capturing parentheses,
707        non-capturing parentheses, and atomic parentheses. It also applied to some
708        assertions.
710    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
711        information out of configure.ac instead of relying on pcre.h.generic, which
712        is not stored in the repository.
714    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
715        -lreadline.
717    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
719    15. Applied Graycode's patch to put the top-level frame on the stack rather
720        than the heap when not using the stack for recursion. This gives a
721        performance improvement in many cases when recursion is not deep.
723    16. Experimental code added to "pcretest -C" to output the stack frame size.
726    Version 8.21 12-Dec-2011
727    ------------------------
729    1.  Updating the JIT compiler.
731    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
732        are added as well.
734    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
735        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
736        calling _pcre_jit_exec. Some extra comments are added.
738    4.  (*MARK) settings inside atomic groups that do not contain any capturing
739        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
740        was introduced by change 18 for 8.20.
742    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
743        ECMA-262 standard.
745    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
746        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
747        This bug was probably introduced by change 9 of 8.13.
749    7.  While fixing 6 above, I noticed that a number of other items were being
750        incorrectly rejected as "not fixed length". This arose partly because newer
751        opcodes had not been added to the fixed-length checking code. I have (a)
752        corrected the bug and added tests for these items, and (b) arranged for an
753        error to occur if an unknown opcode is encountered while checking for fixed
754        length instead of just assuming "not fixed length". The items that were
755        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
756        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
757        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
759    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
760        being incorrectly compiled and would have given unpredicatble results.
762    9.  A possessively repeated subpattern with minimum repeat count greater than
763        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
764        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
765        the first (A) could occur when it should not.
767    10. Add a cast and remove a redundant test from the code.
769    11. JIT should use pcre_malloc/pcre_free for allocation.
771    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
772        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
773        is anything other than /usr, -L is still shown).
775    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
777    14. Perl does not support \N without a following name in a [] class; PCRE now
778        also gives an error.
780    15. If a forward reference was repeated with an upper limit of around 2000,
781        it caused the error "internal error: overran compiling workspace". The
782        maximum number of forward references (including repeats) was limited by the
783        internal workspace, and dependent on the LINK_SIZE. The code has been
784        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
785        the default depends on LINK_SIZE. There is a new upper limit (for safety)
786        of around 200,000 forward references. While doing this, I also speeded up
787        the filling in of repeated forward references.
789    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
790        incorrectly expecting the subject to contain another "a" after the start.
792    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
793        in the match, the SKIP should be ignored. This was not happening; instead
794        the SKIP was being treated as NOMATCH. For patterns such as
795        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
796        tested.
798    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
799        now much more compatible with Perl, in particular in cases where the result
800        is a non-match for a non-anchored pattern. For example, if
801        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
802        "m", where previously it did not return a name. A side effect of this
803        change is that for partial matches, the last encountered mark name is
804        returned, as for non matches. A number of tests that were previously not
805        Perl-compatible have been moved into the Perl-compatible test files. The
806        refactoring has had the pleasing side effect of removing one argument from
807        the match() function, thus reducing its stack requirements.
809    19. If the /S+ option was used in pcretest to study a pattern using JIT,
810        subsequent uses of /S (without +) incorrectly behaved like /S+.
812    21. Retrieve executable code size support for the JIT compiler and fixing
813        some warnings.
815    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
816        not work when the shorter character appeared right at the end of the
817        subject string.
819    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
820        systems.
822    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
823        output it when the /M option is used in pcretest.
825    25. The CheckMan script was not being included in the distribution. Also, added
826        an explicit "perl" to run Perl scripts from the PrepareRelease script
827        because this is reportedly needed in Windows.
829    26. If study data was being save in a file and studying had not found a set of
830        "starts with" bytes for the pattern, the data written to the file (though
831        never used) was taken from uninitialized memory and so caused valgrind to
832        complain.
834    27. Updated RunTest.bat as provided by Sheri Pierce.
836    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
838    29. Computation of memory usage for the table of capturing group names was
839        giving an unnecessarily large value.
842    Version 8.20 21-Oct-2011
843    ------------------------
845    1.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had
846        a POSIX class. After further experiments with Perl, which convinced me that
847        Perl has bugs and confusions, a closing square bracket is no longer allowed
848        in a POSIX name. This bug also affected patterns with classes that started
849        with full stops.
851    2.  If a pattern such as /(a)b|ac/ is matched against "ac", there is no
852        captured substring, but while checking the failing first alternative,
853        substring 1 is temporarily captured. If the output vector supplied to
854        pcre_exec() was not big enough for this capture, the yield of the function
855        was still zero ("insufficient space for captured substrings"). This cannot
856        be totally fixed without adding another stack variable, which seems a lot
857        of expense for a edge case. However, I have improved the situation in cases
858        such as /(a)(b)x|abc/ matched against "abc", where the return code
859        indicates that fewer than the maximum number of slots in the ovector have
860        been set.
862    3.  Related to (2) above: when there are more back references in a pattern than
863        slots in the output vector, pcre_exec() uses temporary memory during
864        matching, and copies in the captures as far as possible afterwards. It was
865        using the entire output vector, but this conflicts with the specification
866        that only 2/3 is used for passing back captured substrings. Now it uses
867        only the first 2/3, for compatibility. This is, of course, another edge
868        case.
870    4.  Zoltan Herczeg's just-in-time compiler support has been integrated into the
871        main code base, and can be used by building with --enable-jit. When this is
872        done, pcregrep automatically uses it unless --disable-pcregrep-jit or the
873        runtime --no-jit option is given.
875    5.  When the number of matches in a pcre_dfa_exec() run exactly filled the
876        ovector, the return from the function was zero, implying that there were
877        other matches that did not fit. The correct "exactly full" value is now
878        returned.
880    6.  If a subpattern that was called recursively or as a subroutine contained
881        (*PRUNE) or any other control that caused it to give a non-standard return,
882        invalid errors such as "Error -26 (nested recursion at the same subject
883        position)" or even infinite loops could occur.
885    7.  If a pattern such as /a(*SKIP)c|b(*ACCEPT)|/ was studied, it stopped
886        computing the minimum length on reaching *ACCEPT, and so ended up with the
887        wrong value of 1 rather than 0. Further investigation indicates that
888        computing a minimum subject length in the presence of *ACCEPT is difficult
889        (think back references, subroutine calls), and so I have changed the code
890        so that no minimum is registered for a pattern that contains *ACCEPT.
892    8.  If (*THEN) was present in the first (true) branch of a conditional group,
893        it was not handled as intended. [But see 16 below.]
895    9.  Replaced RunTest.bat and CMakeLists.txt with improved versions provided by
896        Sheri Pierce.
898    10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that
899        the first byte in a match must be "a".
901    11. Change 17 for 8.13 increased the recursion depth for patterns like
902        /a(?:.)*?a/ drastically. I've improved things by remembering whether a
903        pattern contains any instances of (*THEN). If it does not, the old
904        optimizations are restored. It would be nice to do this on a per-group
905        basis, but at the moment that is not feasible.
907    12. In some environments, the output of pcretest -C is CRLF terminated. This
908        broke RunTest's code that checks for the link size. A single white space
909        character after the value is now allowed for.
911    13. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".
912        For "fr", it uses the Windows-specific input and output files.
914    14. If (*THEN) appeared in a group that was called recursively or as a
915        subroutine, it did not work as intended. [But see next item.]
917    15. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex
918        pattern fragments (but not containing any | characters). If A and B are
919        matched, but there is a failure in C so that it backtracks to (*THEN), PCRE
920        was behaving differently to Perl. PCRE backtracked into A, but Perl goes to
921        D. In other words, Perl considers parentheses that do not contain any |
922        characters to be part of a surrounding alternative, whereas PCRE was
923        treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles
924        differently. PCRE now behaves in the same way as Perl, except in the case
925        of subroutine/recursion calls such as (?1) which have in any case always
926        been different (but PCRE had them first :-).
928    16. Related to 15 above: Perl does not treat the | in a conditional group as
929        creating alternatives. Such a group is treated in the same way as an
930        ordinary group without any | characters when processing (*THEN). PCRE has
931        been changed to match Perl's behaviour.
933    17. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the
934        RunGrepTest script failed.
936    18. Change 22 for version 13 caused atomic groups to use more stack. This is
937        inevitable for groups that contain captures, but it can lead to a lot of
938        stack use in large patterns. The old behaviour has been restored for atomic
939        groups that do not contain any capturing parentheses.
941    19. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not
942        suppress the check for a minimum subject length at run time. (If it was
943        given to pcre_exec() or pcre_dfa_exec() it did work.)
945    20. Fixed an ASCII-dependent infelicity in pcretest that would have made it
946        fail to work when decoding hex characters in data strings in EBCDIC
947        environments.
949    21. It appears that in at least one Mac OS environment, the isxdigit() function
950        is implemented as a macro that evaluates to its argument more than once,
951        contravening the C 90 Standard (I haven't checked a later standard). There
952        was an instance in pcretest which caused it to go wrong when processing
953        \x{...} escapes in subject strings. The has been rewritten to avoid using
954        things like p++ in the argument of isxdigit().
957    Version 8.13 16-Aug-2011
958    ------------------------
960    1.  The Unicode data tables have been updated to Unicode 6.0.0.
962    2.  Two minor typos in pcre_internal.h have been fixed.
964    3.  Added #include <string.h> to pcre_scanner_unittest.cc, pcrecpp.cc, and
965        pcrecpp_unittest.cc. They are needed for strcmp(), memset(), and strchr()
966        in some environments (e.g. Solaris 10/SPARC using Sun Studio 12U2).
968    4.  There were a number of related bugs in the code for matching backrefences
969        caselessly in UTF-8 mode when codes for the characters concerned were
970        different numbers of bytes. For example, U+023A and U+2C65 are an upper
971        and lower case pair, using 2 and 3 bytes, respectively. The main bugs were:
972        (a) A reference to 3 copies of a 2-byte code matched only 2 of a 3-byte
973        code. (b) A reference to 2 copies of a 3-byte code would not match 2 of a
974        2-byte code at the end of the subject (it thought there wasn't enough data
975        left).
977    5.  Comprehensive information about what went wrong is now returned by
978        pcre_exec() and pcre_dfa_exec() when the UTF-8 string check fails, as long
979        as the output vector has at least 2 elements. The offset of the start of
980        the failing character and a reason code are placed in the vector.
982    6.  When the UTF-8 string check fails for pcre_compile(), the offset that is
983        now returned is for the first byte of the failing character, instead of the
984        last byte inspected. This is an incompatible change, but I hope it is small
985        enough not to be a problem. It makes the returned offset consistent with
986        pcre_exec() and pcre_dfa_exec().
988    7.  pcretest now gives a text phrase as well as the error number when
989        pcre_exec() or pcre_dfa_exec() fails; if the error is a UTF-8 check
990        failure, the offset and reason code are output.
992    8.  When \R was used with a maximizing quantifier it failed to skip backwards
993        over a \r\n pair if the subsequent match failed. Instead, it just skipped
994        back over a single character (\n). This seems wrong (because it treated the
995        two characters as a single entity when going forwards), conflicts with the
996        documentation that \R is equivalent to (?>\r\n|\n|...etc), and makes the
997        behaviour of \R* different to (\R)*, which also seems wrong. The behaviour
998        has been changed.
1000    9.  Some internal refactoring has changed the processing so that the handling
1001        of the PCRE_CASELESS and PCRE_MULTILINE options is done entirely at compile
1002        time (the PCRE_DOTALL option was changed this way some time ago: version
1003        7.7 change 16). This has made it possible to abolish the OP_OPT op code,
1004        which was always a bit of a fudge. It also means that there is one less
1005        argument for the match() function, which reduces its stack requirements
1006        slightly. This change also fixes an incompatibility with Perl: the pattern
1007        (?i:([^b]))(?1) should not match "ab", but previously PCRE gave a match.
1009    10. More internal refactoring has drastically reduced the number of recursive
1010        calls to match() for possessively repeated groups such as (abc)++ when
1011        using pcre_exec().
1013    11. While implementing 10, a number of bugs in the handling of groups were
1014        discovered and fixed:
1016        (?<=(a)+) was not diagnosed as invalid (non-fixed-length lookbehind).
1017        (a|)*(?1) gave a compile-time internal error.
1018        ((a|)+)+  did not notice that the outer group could match an empty string.
1019        (^a|^)+   was not marked as anchored.
1020        (.*a|.*)+ was not marked as matching at start or after a newline.
1022    12. Yet more internal refactoring has removed another argument from the match()
1023        function. Special calls to this function are now indicated by setting a
1024        value in a variable in the "match data" data block.
1026    13. Be more explicit in pcre_study() instead of relying on "default" for
1027        opcodes that mean there is no starting character; this means that when new
1028        ones are added and accidentally left out of pcre_study(), testing should
1029        pick them up.
1031    14. The -s option of pcretest has been documented for ages as being an old
1032        synonym of -m (show memory usage). I have changed it to mean "force study
1033        for every regex", that is, assume /S for every regex. This is similar to -i
1034        and -d etc. It's slightly incompatible, but I'm hoping nobody is still
1035        using it. It makes it easier to run collections of tests with and without
1036        study enabled, and thereby test pcre_study() more easily. All the standard
1037        tests are now run with and without -s (but some patterns can be marked as
1038        "never study" - see 20 below).
1040    15. When (*ACCEPT) was used in a subpattern that was called recursively, the
1041        restoration of the capturing data to the outer values was not happening
1042        correctly.
1044    16. If a recursively called subpattern ended with (*ACCEPT) and matched an
1045        empty string, and PCRE_NOTEMPTY was set, pcre_exec() thought the whole
1046        pattern had matched an empty string, and so incorrectly returned a no
1047        match.
1049    17. There was optimizing code for the last branch of non-capturing parentheses,
1050        and also for the obeyed branch of a conditional subexpression, which used
1051        tail recursion to cut down on stack usage. Unfortunately, now that there is
1052        the possibility of (*THEN) occurring in these branches, tail recursion is
1053        no longer possible because the return has to be checked for (*THEN). These
1054        two optimizations have therefore been removed. [But see 8.20/11 above.]
1056    18. If a pattern containing \R was studied, it was assumed that \R always
1057        matched two bytes, thus causing the minimum subject length to be
1058        incorrectly computed because \R can also match just one byte.
1060    19. If a pattern containing (*ACCEPT) was studied, the minimum subject length
1061        was incorrectly computed.
1063    20. If /S is present twice on a test pattern in pcretest input, it now
1064        *disables* studying, thereby overriding the use of -s on the command line
1065        (see 14 above). This is necessary for one or two tests to keep the output
1066        identical in both cases.
1068    21. When (*ACCEPT) was used in an assertion that matched an empty string and
1069        PCRE_NOTEMPTY was set, PCRE applied the non-empty test to the assertion.
1071    22. When an atomic group that contained a capturing parenthesis was
1072        successfully matched, but the branch in which it appeared failed, the
1073        capturing was not being forgotten if a higher numbered group was later
1074        captured. For example, /(?>(a))b|(a)c/ when matching "ac" set capturing
1075        group 1 to "a", when in fact it should be unset. This applied to multi-
1076        branched capturing and non-capturing groups, repeated or not, and also to
1077        positive assertions (capturing in negative assertions does not happen
1078        in PCRE) and also to nested atomic groups.
1080    23. Add the ++ qualifier feature to pcretest, to show the remainder of the
1081        subject after a captured substring, to make it easier to tell which of a
1082        number of identical substrings has been captured.
1084    24. The way atomic groups are processed by pcre_exec() has been changed so that
1085        if they are repeated, backtracking one repetition now resets captured
1086        values correctly. For example, if ((?>(a+)b)+aabab) is matched against
1087        "aaaabaaabaabab" the value of captured group 2 is now correctly recorded as
1088        "aaa". Previously, it would have been "a". As part of this code
1089        refactoring, the way recursive calls are handled has also been changed.
1091    25. If an assertion condition captured any substrings, they were not passed
1092        back unless some other capturing happened later. For example, if
1093        (?(?=(a))a) was matched against "a", no capturing was returned.
1095    26. When studying a pattern that contained subroutine calls or assertions,
1096        the code for finding the minimum length of a possible match was handling
1097        direct recursions such as (xxx(?1)|yyy) but not mutual recursions (where
1098        group 1 called group 2 while simultaneously a separate group 2 called group
1099        1). A stack overflow occurred in this case. I have fixed this by limiting
1100        the recursion depth to 10.
1102    27. Updated RunTest.bat in the distribution to the version supplied by Tom
1103        Fortmann. This supports explicit test numbers on the command line, and has
1104        argument validation and error reporting.
1106    28. An instance of \X with an unlimited repeat could fail if at any point the
1107        first character it looked at was a mark character.
1109    29. Some minor code refactoring concerning Unicode properties and scripts
1110        should reduce the stack requirement of match() slightly.
1112    30. Added the '=' option to pcretest to check the setting of unused capturing
1113        slots at the end of the pattern, which are documented as being -1, but are
1114        not included in the return count.
1116    31. If \k was not followed by a braced, angle-bracketed, or quoted name, PCRE
1117        compiled something random. Now it gives a compile-time error (as does
1118        Perl).
1120    32. A *MARK encountered during the processing of a positive assertion is now
1121        recorded and passed back (compatible with Perl).
1123    33. If --only-matching or --colour was set on a pcregrep call whose pattern
1124        had alternative anchored branches, the search for a second match in a line
1125        was done as if at the line start. Thus, for example, /^01|^02/ incorrectly
1126        matched the line "0102" twice. The same bug affected patterns that started
1127        with a backwards assertion. For example /\b01|\b02/ also matched "0102"
1128        twice.
1130    34. Previously, PCRE did not allow quantification of assertions. However, Perl
1131        does, and because of capturing effects, quantifying parenthesized
1132        assertions may at times be useful. Quantifiers are now allowed for
1133        parenthesized assertions.
1135    35. A minor code tidy in pcre_compile() when checking options for \R usage.
1137    36. \g was being checked for fancy things in a character class, when it should
1138        just be a literal "g".
1140    37. PCRE was rejecting [:a[:digit:]] whereas Perl was not. It seems that the
1141        appearance of a nested POSIX class supersedes an apparent external class.
1142        For example, [:a[:digit:]b:] matches "a", "b", ":", or a digit. Also,
1143        unescaped square brackets may also appear as part of class names. For
1144        example, [:a[:abc]b:] gives unknown class "[:abc]b:]". PCRE now behaves
1145        more like Perl. (But see 8.20/1 above.)
1147    38. PCRE was giving an error for \N with a braced quantifier such as {1,} (this
1148        was because it thought it was \N{name}, which is not supported).
1150    39. Add minix to OS list not supporting the -S option in pcretest.
1152    40. PCRE tries to detect cases of infinite recursion at compile time, but it
1153        cannot analyze patterns in sufficient detail to catch mutual recursions
1154        such as ((?1))((?2)). There is now a runtime test that gives an error if a
1155        subgroup is called recursively as a subpattern for a second time at the
1156        same position in the subject string. In previous releases this might have
1157        been caught by the recursion limit, or it might have run out of stack.
1159    41. A pattern such as /(?(R)a+|(?R)b)/ is quite safe, as the recursion can
1160        happen only once. PCRE was, however incorrectly giving a compile time error
1161        "recursive call could loop indefinitely" because it cannot analyze the
1162        pattern in sufficient detail. The compile time test no longer happens when
1163        PCRE is compiling a conditional subpattern, but actual runaway loops are
1164        now caught at runtime (see 40 above).
1166    42. It seems that Perl allows any characters other than a closing parenthesis
1167        to be part of the NAME in (*MARK:NAME) and other backtracking verbs. PCRE
1168        has been changed to be the same.
1170    43. Updated configure.ac to put in more quoting round AC_LANG_PROGRAM etc. so
1171        as not to get warnings when autogen.sh is called. Also changed
1172        AC_PROG_LIBTOOL (deprecated) to LT_INIT (the current macro).
1174    44. To help people who use pcregrep to scan files containing exceedingly long
1175        lines, the following changes have been made:
1177        (a) The default value of the buffer size parameter has been increased from
1178            8K to 20K. (The actual buffer used is three times this size.)
1180        (b) The default can be changed by ./configure --with-pcregrep-bufsize when
1181            PCRE is built.
1183        (c) A --buffer-size=n option has been added to pcregrep, to allow the size
1184            to be set at run time.
1186        (d) Numerical values in pcregrep options can be followed by K or M, for
1187            example --buffer-size=50K.
1189        (e) If a line being scanned overflows pcregrep's buffer, an error is now
1190            given and the return code is set to 2.
1192    45. Add a pointer to the latest mark to the callout data block.
1194    46. The pattern /.(*F)/, when applied to "abc" with PCRE_PARTIAL_HARD, gave a
1195        partial match of an empty string instead of no match. This was specific to
1196        the use of ".".
1198    47. The pattern /f.*/8s, when applied to "for" with PCRE_PARTIAL_HARD, gave a
1199        complete match instead of a partial match. This bug was dependent on both
1200        the PCRE_UTF8 and PCRE_DOTALL options being set.
1202    48. For a pattern such as /\babc|\bdef/ pcre_study() was failing to set up the
1203        starting byte set, because \b was not being ignored.
1206    Version 8.12 15-Jan-2011
1207    ------------------------
1209    1.  Fixed some typos in the markup of the man pages, and wrote a script that
1210        checks for such things as part of the documentation building process.
1212    2.  On a big-endian 64-bit system, pcregrep did not correctly process the
1213        --match-limit and --recursion-limit options (added for 8.11). In
1214        particular, this made one of the standard tests fail. (The integer value
1215        went into the wrong half of a long int.)
1217    3.  If the --colour option was given to pcregrep with -v (invert match), it
1218        did strange things, either producing crazy output, or crashing. It should,
1219        of course, ignore a request for colour when reporting lines that do not
1220        match.
1222    4.  Another pcregrep bug caused similar problems if --colour was specified with
1223        -M (multiline) and the pattern match finished with a line ending.
1225    5.  In pcregrep, when a pattern that ended with a literal newline sequence was
1226        matched in multiline mode, the following line was shown as part of the
1227        match. This seems wrong, so I have changed it.
1229    6.  Another pcregrep bug in multiline mode, when --colour was specified, caused
1230        the check for further matches in the same line (so they could be coloured)
1231        to overrun the end of the current line. If another match was found, it was
1232        incorrectly shown (and then shown again when found in the next line).
1234    7.  If pcregrep was compiled under Windows, there was a reference to the
1235        function pcregrep_exit() before it was defined. I am assuming this was
1236        the cause of the "error C2371: 'pcregrep_exit' : redefinition;" that was
1237        reported by a user. I've moved the definition above the reference.
1240    Version 8.11 10-Dec-2010
1241    ------------------------
1243    1.  (*THEN) was not working properly if there were untried alternatives prior
1244        to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
1245        backtracked to try for "b" instead of moving to the next alternative branch
1246        at the same level (in this case, to look for "c"). The Perl documentation
1247        is clear that when (*THEN) is backtracked onto, it goes to the "next
1248        alternative in the innermost enclosing group".
1250    2.  (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
1251        such as   (A(*COMMIT)B(*THEN)C|D)  any failure after matching A should
1252        result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
1253        (*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
1254        (*THEN).
1256    3.  If \s appeared in a character class, it removed the VT character from
1257        the class, even if it had been included by some previous item, for example
1258        in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
1259        of \s, but is part of the POSIX "space" class.)
1261    4.  A partial match never returns an empty string (because you can always
1262        match an empty string at the end of the subject); however the checking for
1263        an empty string was starting at the "start of match" point. This has been
1264        changed to the "earliest inspected character" point, because the returned
1265        data for a partial match starts at this character. This means that, for
1266        example, /(?<=abc)def/ gives a partial match for the subject "abc"
1267        (previously it gave "no match").
1269    5.  Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
1270        of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
1271        previously a full match would be given. However, setting PCRE_PARTIAL_HARD
1272        has an implication that the given string is incomplete (because a partial
1273        match is preferred over a full match). For this reason, these items now
1274        give a partial match in this situation. [Aside: previously, the one case
1275        /t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
1276        match rather than a full match, which was wrong by the old rules, but is
1277        now correct.]
1279    6.  There was a bug in the handling of #-introduced comments, recognized when
1280        PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
1281        If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
1282        UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
1283        scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
1284        but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
1285        places in pcre_compile().
1287    7.  Related to (6) above, when pcre_compile() was skipping #-introduced
1288        comments when looking ahead for named forward references to subpatterns,
1289        the only newline sequence it recognized was NL. It now handles newlines
1290        according to the set newline convention.
1292    8.  SunOS4 doesn't have strerror() or strtoul(); pcregrep dealt with the
1293        former, but used strtoul(), whereas pcretest avoided strtoul() but did not
1294        cater for a lack of strerror(). These oversights have been fixed.
1296    9.  Added --match-limit and --recursion-limit to pcregrep.
1298    10. Added two casts needed to build with Visual Studio when NO_RECURSE is set.
1300    11. When the -o option was used, pcregrep was setting a return code of 1, even
1301        when matches were found, and --line-buffered was not being honoured.
1303    12. Added an optional parentheses number to the -o and --only-matching options
1304        of pcregrep.
1306    13. Imitating Perl's /g action for multiple matches is tricky when the pattern
1307        can match an empty string. The code to do it in pcretest and pcredemo
1308        needed fixing:
1310        (a) When the newline convention was "crlf", pcretest got it wrong, skipping
1311            only one byte after an empty string match just before CRLF (this case
1312            just got forgotten; "any" and "anycrlf" were OK).
1314        (b) The pcretest code also had a bug, causing it to loop forever in UTF-8
1315            mode when an empty string match preceded an ASCII character followed by
1316            a non-ASCII character. (The code for advancing by one character rather
1317            than one byte was nonsense.)
1319        (c) The pcredemo.c sample program did not have any code at all to handle
1320            the cases when CRLF is a valid newline sequence.
1322    14. Neither pcre_exec() nor pcre_dfa_exec() was checking that the value given
1323        as a starting offset was within the subject string. There is now a new
1324        error, PCRE_ERROR_BADOFFSET, which is returned if the starting offset is
1325        negative or greater than the length of the string. In order to test this,
1326        pcretest is extended to allow the setting of negative starting offsets.
1328    15. In both pcre_exec() and pcre_dfa_exec() the code for checking that the
1329        starting offset points to the beginning of a UTF-8 character was
1330        unnecessarily clumsy. I tidied it up.
1332    16. Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
1333        bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
1335    17. Nobody had reported that the --include_dir option, which was added in
1336        release 7.7 should have been called --include-dir (hyphen, not underscore)
1337        for compatibility with GNU grep. I have changed it to --include-dir, but
1338        left --include_dir as an undocumented synonym, and the same for
1339        --exclude-dir, though that is not available in GNU grep, at least as of
1340        release 2.5.4.
1342    18. At a user's suggestion, the macros GETCHAR and friends (which pick up UTF-8
1343        characters from a string of bytes) have been redefined so as not to use
1344        loops, in order to improve performance in some environments. At the same
1345        time, I abstracted some of the common code into auxiliary macros to save
1346        repetition (this should not affect the compiled code).
1348    19. If \c was followed by a multibyte UTF-8 character, bad things happened. A
1349        compile-time error is now given if \c is not followed by an ASCII
1350        character, that is, a byte less than 128. (In EBCDIC mode, the code is
1351        different, and any byte value is allowed.)
1353    20. Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
1354        START_OPTIMIZE option, which is now allowed at compile time - but just
1355        passed through to pcre_exec() or pcre_dfa_exec(). This makes it available
1356        to pcregrep and other applications that have no direct access to PCRE
1357        options. The new /Y option in pcretest sets this option when calling
1358        pcre_compile().
1360    21. Change 18 of release 8.01 broke the use of named subpatterns for recursive
1361        back references. Groups containing recursive back references were forced to
1362        be atomic by that change, but in the case of named groups, the amount of
1363        memory required was incorrectly computed, leading to "Failed: internal
1364        error: code overflow". This has been fixed.
1366    22. Some patches to pcre_stringpiece.h, pcre_stringpiece_unittest.cc, and
1367        pcretest.c, to avoid build problems in some Borland environments.
1370    Version 8.10 25-Jun-2010
1371    ------------------------
1373    1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
1374        THEN.
1376    2.  (*ACCEPT) was not working when inside an atomic group.
1378    3.  Inside a character class, \B is treated as a literal by default, but
1379        faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
1380        causes the error). The code is unchanged, but I tidied the documentation.
1382    4.  Inside a character class, PCRE always treated \R and \X as literals,
1383        whereas Perl faults them if its -w option is set. I have changed PCRE so
1384        that it faults them when PCRE_EXTRA is set.
1386    5.  Added support for \N, which always matches any character other than
1387        newline. (It is the same as "." when PCRE_DOTALL is not set.)
1389    6.  When compiling pcregrep with newer versions of gcc which may have
1390        FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
1391        declared with attribute warn_unused_result" were given. Just casting the
1392        result to (void) does not stop the warnings; a more elaborate fudge is
1393        needed. I've used a macro to implement this.
1395    7.  Minor change to pcretest.c to avoid a compiler warning.
1397    8.  Added four artifical Unicode properties to help with an option to make
1398        \s etc use properties (see next item). The new properties are: Xan
1399        (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
1401    9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
1402        use Unicode properties. (*UCP) at the start of a pattern can be used to set
1403        this option. Modified pcretest to add /W to test this facility. Added
1404        REG_UCP to make it available via the POSIX interface.
1406    10. Added --line-buffered to pcregrep.
1408    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
1409        studied, and the match started with a letter with a code point greater than
1410        127 whose first byte was different to the first byte of the other case of
1411        the letter, the other case of this starting letter was not recognized
1412        (#976).
1414    12. If a pattern that was studied started with a repeated Unicode property
1415        test, for example, \p{Nd}+, there was the theoretical possibility of
1416        setting up an incorrect bitmap of starting bytes, but fortunately it could
1417        not have actually happened in practice until change 8 above was made (it
1418        added property types that matched character-matching opcodes).
1420    13. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
1421        possible starting bytes for non-anchored patterns.
1423    14. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes
1424        \R, and also a number of cases that involve Unicode properties, both
1425        explicit and implicit when PCRE_UCP is set.
1427    15. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
1428        input, it could crash or give wrong results if characters with values
1429        greater than 0xc0 were present in the subject string. (Detail: it assumed
1430        UTF-8 input when processing these items.)
1432    16. Added a lot of (int) casts to avoid compiler warnings in systems where
1433        size_t is 64-bit (#991).
1435    17. Added a check for running out of memory when PCRE is compiled with
1436        --disable-stack-for-recursion (#990).
1438    18. If the last data line in a file for pcretest does not have a newline on
1439        the end, a newline was missing in the output.
1441    19. The default pcre_chartables.c file recognizes only ASCII characters (values
1442        less than 128) in its various bitmaps. However, there is a facility for
1443        generating tables according to the current locale when PCRE is compiled. It
1444        turns out that in some environments, 0x85 and 0xa0, which are Unicode space
1445        characters, are recognized by isspace() and therefore were getting set in
1446        these tables, and indeed these tables seem to approximate to ISO 8859. This
1447        caused a problem in UTF-8 mode when pcre_study() was used to create a list
1448        of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
1449        which of course cannot start UTF-8 characters. I have changed the code so
1450        that only real ASCII characters (less than 128) and the correct starting
1451        bytes for UTF-8 encodings are set for characters greater than 127 when in
1452        UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
1453        altogether.)
1455    20. Added the /T option to pcretest so as to be able to run tests with non-
1456        standard character tables, thus making it possible to include the tests
1457        used for 19 above in the standard set of tests.
1459    21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
1460        reference to a subpattern the other side of a comment that contains an
1461        opening parenthesis caused either an internal compiling error, or a
1462        reference to the wrong subpattern.
1465    Version 8.02 19-Mar-2010
1466    ------------------------
1468    1.  The Unicode data tables have been updated to Unicode 5.2.0.
1470    2.  Added the option --libs-cpp to pcre-config, but only when C++ support is
1471        configured.
1473    3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the
1474        original author of that file, following a query about its status.
1476    4.  On systems that do not have stdint.h (e.g. Solaris), check for and include
1477        inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.
1479    5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
1480        quantifier applied to a forward-referencing subroutine call, could compile
1481        incorrect code or give the error "internal error: previously-checked
1482        referenced subpattern not found".
1484    6.  Both MS Visual Studio and Symbian OS have problems with initializing
1485        variables to point to external functions. For these systems, therefore,
1486        pcre_malloc etc. are now initialized to local functions that call the
1487        relevant global functions.
1489    7.  There were two entries missing in the vectors called coptable and poptable
1490        in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.
1491        I've fixed the data, and added a kludgy way of testing at compile time that
1492        the lengths are correct (equal to the number of opcodes).
1494    8.  Following on from 7, I added a similar kludge to check the length of the
1495        eint vector in pcreposix.c.
1497    9.  Error texts for pcre_compile() are held as one long string to avoid too
1498        much relocation at load time. To find a text, the string is searched,
1499        counting zeros. There was no check for running off the end of the string,
1500        which could happen if a new error number was added without updating the
1501        string.
1503    10. \K gave a compile-time error if it appeared in a lookbehind assersion.
1505    11. \K was not working if it appeared in an atomic group or in a group that
1506        was called as a "subroutine", or in an assertion. Perl 5.11 documents that
1507        \K is "not well defined" if used in an assertion. PCRE now accepts it if
1508        the assertion is positive, but not if it is negative.
1510    12. Change 11 fortuitously reduced the size of the stack frame used in the
1511        "match()" function of pcre_exec.c by one pointer. Forthcoming
1512        implementation of support for (*MARK) will need an extra pointer on the
1513        stack; I have reserved it now, so that the stack frame size does not
1514        decrease.
1516    13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other
1517        item in branch that calls a recursion is a subroutine call - as in the
1518        second branch in the above example - was incorrectly given the compile-
1519        time error "recursive call could loop indefinitely" because pcre_compile()
1520        was not correctly checking the subroutine for matching a non-empty string.
1522    14. The checks for overrunning compiling workspace could trigger after an
1523        overrun had occurred. This is a "should never occur" error, but it can be
1524        triggered by pathological patterns such as hundreds of nested parentheses.
1525        The checks now trigger 100 bytes before the end of the workspace.
1527    15. Fix typo in configure.ac: "srtoq" should be "strtoq".
1530    Version 8.01 19-Jan-2010
1531    ------------------------
1533    1.  If a pattern contained a conditional subpattern with only one branch (in
1534        particular, this includes all (*DEFINE) patterns), a call to pcre_study()
1535        computed the wrong minimum data length (which is of course zero for such
1536        subpatterns). This could cause incorrect "no match" results.
1538    2.  For patterns such as (?i)a(?-i)b|c where an option setting at the start of
1539        the pattern is reset in the first branch, pcre_compile() failed with
1540        "internal error: code overflow at offset...". This happened only when
1541        the reset was to the original external option setting. (An optimization
1542        abstracts leading options settings into an external setting, which was the
1543        cause of this.)
1545    3.  A pattern such as ^(?!a(*SKIP)b) where a negative assertion contained one
1546        of the verbs SKIP, PRUNE, or COMMIT, did not work correctly. When the
1547        assertion pattern did not match (meaning that the assertion was true), it
1548        was incorrectly treated as false if the SKIP had been reached during the
1549        matching. This also applied to assertions used as conditions.
1551    4.  If an item that is not supported by pcre_dfa_exec() was encountered in an
1552        assertion subpattern, including such a pattern used as a condition,
1553        unpredictable results occurred, instead of the error return
1556    5.  The C++ GlobalReplace function was not working like Perl for the special
1557        situation when an empty string is matched. It now does the fancy magic
1558        stuff that is necessary.
1560    6.  In pcre_internal.h, obsolete includes to setjmp.h and stdarg.h have been
1561        removed. (These were left over from very, very early versions of PCRE.)
1563    7.  Some cosmetic changes to the code to make life easier when compiling it
1564        as part of something else:
1566        (a) Change DEBUG to PCRE_DEBUG.
1568        (b) In pcre_compile(), rename the member of the "branch_chain" structure
1569            called "current" as "current_branch", to prevent a collision with the
1570            Linux macro when compiled as a kernel module.
1572        (c) In pcre_study(), rename the function set_bit() as set_table_bit(), to
1573            prevent a collision with the Linux macro when compiled as a kernel
1574            module.
1576    8.  In pcre_compile() there are some checks for integer overflows that used to
1577        cast potentially large values to (double). This has been changed to that
1578        when building, a check for int64_t is made, and if it is found, it is used
1579        instead, thus avoiding the use of floating point arithmetic. (There is no
1580        other use of FP in PCRE.) If int64_t is not found, the fallback is to
1581        double.
1583    9.  Added two casts to avoid signed/unsigned warnings from VS Studio Express
1584        2005 (difference between two addresses compared to an unsigned value).
1586    10. Change the standard AC_CHECK_LIB test for libbz2 in configure.ac to a
1587        custom one, because of the following reported problem in Windows:
1589          - libbz2 uses the Pascal calling convention (WINAPI) for the functions
1590              under Win32.
1591          - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",
1592              therefore missing the function definition.
1593          - The compiler thus generates a "C" signature for the test function.
1594          - The linker fails to find the "C" function.
1595          - PCRE fails to configure if asked to do so against libbz2.
1597    11. When running libtoolize from libtool-2.2.6b as part of autogen.sh, these
1598        messages were output:
1600          Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and
1601          rerunning libtoolize, to keep the correct libtool macros in-tree.
1602          Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
1604        I have done both of these things.
1606    12. Although pcre_dfa_exec() does not use nearly as much stack as pcre_exec()
1607        most of the time, it *can* run out if it is given a pattern that contains a
1608        runaway infinite recursion. I updated the discussion in the pcrestack man
1609        page.
1611    13. Now that we have gone to the x.xx style of version numbers, the minor
1612        version may start with zero. Using 08 or 09 is a bad idea because users
1613        might check the value of PCRE_MINOR in their code, and 08 or 09 may be
1614        interpreted as invalid octal numbers. I've updated the previous comment in
1615        configure.ac, and also added a check that gives an error if 08 or 09 are
1616        used.
1618    14. Change 8.00/11 was not quite complete: code had been accidentally omitted,
1619        causing partial matching to fail when the end of the subject matched \W
1620        in a UTF-8 pattern where \W was quantified with a minimum of 3.
1622    15. There were some discrepancies between the declarations in pcre_internal.h
1623        of _pcre_is_newline(), _pcre_was_newline(), and _pcre_valid_utf8() and
1624        their definitions. The declarations used "const uschar *" and the
1625        definitions used USPTR. Even though USPTR is normally defined as "const
1626        unsigned char *" (and uschar is typedeffed as "unsigned char"), it was
1627        reported that: "This difference in casting confuses some C++ compilers, for
1628        example, SunCC recognizes above declarations as different functions and
1629        generates broken code for hbpcre." I have changed the declarations to use
1630        USPTR.
1632    16. GNU libtool is named differently on some systems. The autogen.sh script now
1633        tries several variants such as glibtoolize (MacOSX) and libtoolize1x
1634        (FreeBSD).
1636    17. Applied Craig's patch that fixes an HP aCC compile error in pcre 8.00
1637        (strtoXX undefined when compiling pcrecpp.cc). The patch contains this
1638        comment: "Figure out how to create a longlong from a string: strtoll and
1639        equivalent. It's not enough to call AC_CHECK_FUNCS: hpux has a strtoll, for
1640        instance, but it only takes 2 args instead of 3!"
1642    18. A subtle bug concerned with back references has been fixed by a change of
1643        specification, with a corresponding code fix. A pattern such as
1644        ^(xa|=?\1a)+$ which contains a back reference inside the group to which it
1645        refers, was giving matches when it shouldn't. For example, xa=xaaa would
1646        match that pattern. Interestingly, Perl (at least up to 5.11.3) has the
1647        same bug. Such groups have to be quantified to be useful, or contained
1648        inside another quantified group. (If there's no repetition, the reference
1649        can never match.) The problem arises because, having left the group and
1650        moved on to the rest of the pattern, a later failure that backtracks into
1651        the group uses the captured value from the final iteration of the group
1652        rather than the correct earlier one. I have fixed this in PCRE by forcing
1653        any group that contains a reference to itself to be an atomic group; that
1654        is, there cannot be any backtracking into it once it has completed. This is
1655        similar to recursive and subroutine calls.
1658    Version 8.00 19-Oct-09
1659    ----------------------
1661    1.  The table for translating pcre_compile() error codes into POSIX error codes
1662        was out-of-date, and there was no check on the pcre_compile() error code
1663        being within the table. This could lead to an OK return being given in
1664        error.
1666    2.  Changed the call to open a subject file in pcregrep from fopen(pathname,
1667        "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
1668        in a Windows environment.
1670    3.  The pcregrep --count option prints the count for each file even when it is
1671        zero, as does GNU grep. However, pcregrep was also printing all files when
1672        --files-with-matches was added. Now, when both options are given, it prints
1673        counts only for those files that have at least one match. (GNU grep just
1674        prints the file name in this circumstance, but including the count seems
1675        more useful - otherwise, why use --count?) Also ensured that the
1676        combination -clh just lists non-zero counts, with no names.
1678    4.  The long form of the pcregrep -F option was incorrectly implemented as
1679        --fixed_strings instead of --fixed-strings. This is an incompatible change,
1680        but it seems right to fix it, and I didn't think it was worth preserving
1681        the old behaviour.
1683    5.  The command line items --regex=pattern and --regexp=pattern were not
1684        recognized by pcregrep, which required --regex pattern or --regexp pattern
1685        (with a space rather than an '='). The man page documented the '=' forms,
1686        which are compatible with GNU grep; these now work.
1688    6.  No libpcreposix.pc file was created for pkg-config; there was just
1689        libpcre.pc and libpcrecpp.pc. The omission has been rectified.
1691    7.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
1692        when UCP support is not needed, by modifying the Python script that
1693        generates it from Unicode data files. This should not matter if the module
1694        is correctly used as a library, but I received one complaint about 50K of
1695        unwanted data. My guess is that the person linked everything into his
1696        program rather than using a library. Anyway, it does no harm.
1698    8.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
1699        was a minimum greater than 1 for a wide character in a possessive
1700        repetition. The same bug could also affect patterns like /(\x{ff}{0,2})*/8
1701        which had an unlimited repeat of a nested, fixed maximum repeat of a wide
1702        character. Chaos in the form of incorrect output or a compiling loop could
1703        result.
1705    9.  The restrictions on what a pattern can contain when partial matching is
1706        requested for pcre_exec() have been removed. All patterns can now be
1707        partially matched by this function. In addition, if there are at least two
1708        slots in the offset vector, the offset of the earliest inspected character
1709        for the match and the offset of the end of the subject are set in them when
1710        PCRE_ERROR_PARTIAL is returned.
1712    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
1713        synonymous with PCRE_PARTIAL, for backwards compatibility, and
1714        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
1715        and may be more useful for multi-segment matching.
1717    11. Partial matching with pcre_exec() is now more intuitive. A partial match
1718        used to be given if ever the end of the subject was reached; now it is
1719        given only if matching could not proceed because another character was
1720        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
1721        string "Z", which now yields "no match" instead of "partial match". In the
1722        case of pcre_dfa_exec(), "no match" is given if every matching path for the
1723        final character ended with (*FAIL).
1725    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
1726        if the pattern had a "must contain" character that was already found in the
1727        earlier partial match, unless partial matching was again requested. For
1728        example, with the pattern /dog.(body)?/, the "must contain" character is
1729        "g". If the first part-match was for the string "dog", restarting with
1730        "sbody" failed. This bug has been fixed.
1732    13. The string returned by pcre_dfa_exec() after a partial match has been
1733        changed so that it starts at the first inspected character rather than the
1734        first character of the match. This makes a difference only if the pattern
1735        starts with a lookbehind assertion or \b or \B (\K is not supported by
1736        pcre_dfa_exec()). It's an incompatible change, but it makes the two
1737        matching functions compatible, and I think it's the right thing to do.
1739    14. Added a pcredemo man page, created automatically from the pcredemo.c file,
1740        so that the demonstration program is easily available in environments where
1741        PCRE has not been installed from source.
1743    15. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
1744        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
1745        library.
1747    16. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
1748        It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
1749        is not the first non-POSIX option to be added. Clearly some people find
1750        these options useful.
1752    17. If a caller to the POSIX matching function regexec() passes a non-zero
1753        value for nmatch with a NULL value for pmatch, the value of
1754        nmatch is forced to zero.
1756    18. RunGrepTest did not have a test for the availability of the -u option of
1757        the diff command, as RunTest does. It now checks in the same way as
1758        RunTest, and also checks for the -b option.
1760    19. If an odd number of negated classes containing just a single character
1761        interposed, within parentheses, between a forward reference to a named
1762        subpattern and the definition of the subpattern, compilation crashed with
1763        an internal error, complaining that it could not find the referenced
1764        subpattern. An example of a crashing pattern is /(?&A)(([^m])(?<A>))/.
1765        [The bug was that it was starting one character too far in when skipping
1766        over the character class, thus treating the ] as data rather than
1767        terminating the class. This meant it could skip too much.]
1769    20. Added PCRE_NOTEMPTY_ATSTART in order to be able to correctly implement the
1770        /g option in pcretest when the pattern contains \K, which makes it possible
1771        to have an empty string match not at the start, even when the pattern is
1772        anchored. Updated pcretest and pcredemo to use this option.
1774    21. If the maximum number of capturing subpatterns in a recursion was greater
1775        than the maximum at the outer level, the higher number was returned, but
1776        with unset values at the outer level. The correct (outer level) value is
1777        now given.
1779    22. If (*ACCEPT) appeared inside capturing parentheses, previous releases of
1780        PCRE did not set those parentheses (unlike Perl). I have now found a way to
1781        make it do so. The string so far is captured, making this feature
1782        compatible with Perl.
1784    23. The tests have been re-organized, adding tests 11 and 12, to make it
1785        possible to check the Perl 5.10 features against Perl 5.10.
1787    24. Perl 5.10 allows subroutine calls in lookbehinds, as long as the subroutine
1788        pattern matches a fixed length string. PCRE did not allow this; now it
1789        does. Neither allows recursion.
1791    25. I finally figured out how to implement a request to provide the minimum
1792        length of subject string that was needed in order to match a given pattern.
1793        (It was back references and recursion that I had previously got hung up
1794        on.) This code has now been added to pcre_study(); it finds a lower bound
1795        to the length of subject needed. It is not necessarily the greatest lower
1796        bound, but using it to avoid searching strings that are too short does give
1797        some useful speed-ups. The value is available to calling programs via
1798        pcre_fullinfo().
1800    26. While implementing 25, I discovered to my embarrassment that pcretest had
1801        not been passing the result of pcre_study() to pcre_dfa_exec(), so the
1802        study optimizations had never been tested with that matching function.
1803        Oops. What is worse, even when it was passed study data, there was a bug in
1804        pcre_dfa_exec() that meant it never actually used it. Double oops. There
1805        were also very few tests of studied patterns with pcre_dfa_exec().
1807    27. If (?| is used to create subpatterns with duplicate numbers, they are now
1808        allowed to have the same name, even if PCRE_DUPNAMES is not set. However,
1809        on the other side of the coin, they are no longer allowed to have different
1810        names, because these cannot be distinguished in PCRE, and this has caused
1811        confusion. (This is a difference from Perl.)
1813    28. When duplicate subpattern names are present (necessarily with different
1814        numbers, as required by 27 above), and a test is made by name in a
1815        conditional pattern, either for a subpattern having been matched, or for
1816        recursion in such a pattern, all the associated numbered subpatterns are
1817        tested, and the overall condition is true if the condition is true for any
1818        one of them. This is the way Perl works, and is also more like the way
1819        testing by number works.
1822    Version 7.9 11-Apr-09
1823    ---------------------
1825    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
1826        (pcretest), all targets were linked against these libraries. This included
1827        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
1828        libraries. This caused unwanted dependencies to be created. This problem
1829        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
1830        pcretest is linked with readline.
1832    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
1833        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
1834        moved outside it again, because FALSE and TRUE are already defined in AIX,
1835        but BOOL is not.
1837    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
1838        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
1840    4.  The pcregrep documentation said spaces were inserted as well as colons (or
1841        hyphens) following file names and line numbers when outputting matching
1842        lines. This is not true; no spaces are inserted. I have also clarified the
1843        wording for the --colour (or --color) option.
1845    5.  In pcregrep, when --colour was used with -o, the list of matching strings
1846        was not coloured; this is different to GNU grep, so I have changed it to be
1847        the same.
1849    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
1850        each matching line was coloured. Now it goes on to look for further matches
1851        of any of the test patterns, which is the same behaviour as GNU grep.
1853    7.  A pattern that could match an empty string could cause pcregrep to loop; it
1854        doesn't make sense to accept an empty string match in pcregrep, so I have
1855        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
1856        seems to be how GNU grep behaves. [But see later change 40 for release
1857        8.33.]
1859    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
1860        start or after a newline", because the conditional assertion was not being
1861        correctly handled. The rule now is that both the assertion and what follows
1862        in the first alternative must satisfy the test.
1864    9.  If auto-callout was enabled in a pattern with a conditional group whose
1865        condition was an assertion, PCRE could crash during matching, both with
1866        pcre_exec() and pcre_dfa_exec().
1868    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
1869        used for matching.
1871    11. Unicode property support in character classes was not working for
1872        characters (bytes) greater than 127 when not in UTF-8 mode.
1874    12. Added the -M command line option to pcretest.
1876    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
1878    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
1880    16. Added comments and documentation about mis-use of no_arg in the C++
1881        wrapper.
1883    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
1884        from Martin Jerabek that uses macro names for all relevant character and
1885        string constants.
1887    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
1888        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
1889        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
1890        these, but not everybody uses configure.
1892    19. A conditional group that had only one branch was not being correctly
1893        recognized as an item that could match an empty string. This meant that an
1894        enclosing group might also not be so recognized, causing infinite looping
1895        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
1896        with the subject "ab", where knowledge that the repeated group can match
1897        nothing is needed in order to break the loop.
1899    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
1900        exec(), but without supplying a callout function, matching went wrong.
1902    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
1903        leak if the size of the offset vector was greater than 30. When the vector
1904        is smaller, the saved offsets during recursion go onto a local stack
1905        vector, but for larger vectors malloc() is used. It was failing to free
1906        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
1907        error, in fact).
1909    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
1910        heapframe that is used only when UTF-8 support is enabled. This caused no
1911        problem, but was untidy.
1913    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
1914        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
1915        included within another project.
1917    24. Steven Van Ingelgem's patches to add more options to the CMake support,
1918        slightly modified by me:
1920          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
1921              not building pcregrep.
1923          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
1924              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
1926    25. Forward references, both numeric and by name, in patterns that made use of
1927        duplicate group numbers, could behave incorrectly or give incorrect errors,
1928        because when scanning forward to find the reference group, PCRE was not
1929        taking into account the duplicate group numbers. A pattern such as
1930        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
1932    26. Changed a few more instances of "const unsigned char *" to USPTR, making
1933        the feature of a custom pointer more persuasive (as requested by a user).
1935    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
1936        pcretest.c, inside #ifndefs, because it seems they are sometimes already
1937        pre-defined.
1939    28. Added support for (*UTF8) at the start of a pattern.
1941    29. Arrange for flags added by the "release type" setting in CMake to be shown
1942        in the configuration summary.
1945    Version 7.8 05-Sep-08
1946    ---------------------
1948    1.  Replaced UCP searching code with optimized version as implemented for Ad
1949        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
1950        stage table and inline lookup instead of a function, giving speed ups of 2
1951        to 5 times on some simple patterns that I tested. Permission was given to
1952        distribute the MultiStage2.py script that generates the tables (it's not in
1953        the tarball, but is in the Subversion repository).
1955    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
1956        scripts.
1958    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
1959        a group with a zero qualifier. The result of the study could be incorrect,
1960        or the function might crash, depending on the pattern.
1962    4.  Caseless matching was not working for non-ASCII characters in back
1963        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
1964        It now works when Unicode Property Support is available.
1966    5.  In pcretest, an escape such as \x{de} in the data was always generating
1967        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
1968        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
1969        truncation.
1971    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
1973    7.  Added two (int) casts to pcregrep when printing the difference of two
1974        pointers, in case they are 64-bit values.
1976    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
1977        test 2 if it fails.
1979    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
1980        and a #define of that name to empty if it is not externally set. This is to
1981        allow users of MSVC to set it if necessary.
1983    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
1984        the convenience functions in the pcre_get.c source file.
1986    11. An option change at the start of a pattern that had top-level alternatives
1987        could cause overwriting and/or a crash. This command provoked a crash in
1988        some environments:
1990          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
1992        This potential security problem was recorded as CVE-2008-2371.
1994    12. For a pattern where the match had to start at the beginning or immediately
1995        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
1996        pcre_dfa_exec() could read past the end of the passed subject if there was
1997        no match. To help with detecting such bugs (e.g. with valgrind), I modified
1998        pcretest so that it places the subject at the end of its malloc-ed buffer.
2000    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
2001        exec() might read past the end of the data buffer in UTF-8 mode.
2003    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
2004        the data contained the byte 0x85 as part of a UTF-8 character within its
2005        first line. This applied both to normal and DFA matching.
2007    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
2008        /^[^d]*?$/8 failed to match "abc".
2010    16. Added a missing copyright notice to pcrecpp_internal.h.
2012    17. Make it more clear in the documentation that values returned from
2013        pcre_exec() in ovector are byte offsets, not character counts.
2015    18. Tidied a few places to stop certain compilers from issuing warnings.
2017    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
2018        supplied by Stefan Weber. I made a further small update for 7.8 because
2019        there is a change of source arrangements: the pcre_searchfuncs.c module is
2020        replaced by pcre_ucd.c.
2023    Version 7.7 07-May-08
2024    ---------------------
2026    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
2027        a string to a long long, pretend we don't even have a long long." This is
2028        done by checking for the strtoq, strtoll, and _strtoi64 functions.
2030    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
2031        pre-7.6 versions, which defined a global no_arg variable instead of putting
2032        it in the RE class. (See also #8 below.)
2034    3.  Remove a line of dead code, identified by coverity and reported by Nuno
2035        Lopes.
2037    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
2039        (1) The include/exclude patterns were being applied to the whole pathnames
2040            of files, instead of just to the final components.
2042        (2) If there was more than one level of directory, the subdirectories were
2043            skipped unless they satisfied the include/exclude conditions. This is
2044            inconsistent with GNU grep (and could even be seen as contrary to the
2045            pcregrep specification - which I improved to make it absolutely clear).
2046            The action now is always to scan all levels of directory, and just
2047            apply the include/exclude patterns to regular files.
2049    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
2050        --exclude_dir in the tests to avoid scanning .svn directories.
2052    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
2053        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
2054        doesn't support NULs in patterns.
2056    7.  Added some missing "const"s to declarations of static tables in
2057        pcre_compile.c and pcre_dfa_exec.c.
2059    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
2060        caused by fix #2  above. (Subsequently also a second patch to fix the
2061        first patch. And a third patch - this was a messy problem.)
2063    9.  Applied Craig's patch to remove the use of push_back().
2065    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
2066        matching function regexec().
2068    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
2069        which, however, unlike Perl's \g{...}, are subroutine calls, not back
2070        references. PCRE supports relative numbers with this syntax (I don't think
2071        Oniguruma does).
2073    12. Previously, a group with a zero repeat such as (...){0} was completely
2074        omitted from the compiled regex. However, this means that if the group
2075        was called as a subroutine from elsewhere in the pattern, things went wrong
2076        (an internal error was given). Such groups are now left in the compiled
2077        pattern, with a new opcode that causes them to be skipped at execution
2078        time.
2080    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
2081        to the way PCRE behaves:
2083        (a) A lone ] character is dis-allowed (Perl treats it as data).
2085        (b) A back reference to an unmatched subpattern matches an empty string
2086            (Perl fails the current match path).
2088        (c) A data ] in a character class must be notated as \] because if the
2089            first data character in a class is ], it defines an empty class. (In
2090            Perl it is not possible to have an empty class.) The empty class []
2091            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
2092            The negative empty class [^] matches any one character, independently
2093            of the DOTALL setting.
2095    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
2096        non-existent subpattern following a character class starting with ']' and
2097        containing () gave an internal compiling error instead of "reference to
2098        non-existent subpattern". Fortunately, when the pattern did exist, the
2099        compiled code was correct. (When scanning forwards to check for the
2100        existence of the subpattern, it was treating the data ']' as terminating
2101        the class, so got the count wrong. When actually compiling, the reference
2102        was subsequently set up correctly.)
2104    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
2105        it was being rejected as not supported by pcre_dfa_exec(), even though
2106        other assertions are supported. I have made pcre_dfa_exec() support
2107        (*FAIL).
2109    16. The implementation of 13c above involved the invention of a new opcode,
2110        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
2111        cannot be changed at match time, I realized I could make a small
2112        improvement to matching performance by compiling OP_ALLANY instead of
2113        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
2114        on the OP_ANY path.
2116    17. Compiling pcretest on Windows with readline support failed without the
2117        following two fixes: (1) Make the unistd.h include conditional on
2118        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
2120    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
2121        ncurses library to be included for pcretest when ReadLine support is
2122        requested, but also to allow for it to be overridden. This patch came from
2123        Daniel Bergström.
2125    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
2126        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
2127        any errors with the current Unicode tables. Thanks to Peter Kankowski for
2128        spotting this.
2131    Version 7.6 28-Jan-08
2132    ---------------------
2134    1.  A character class containing a very large number of characters with
2135        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
2136        overflow.
2138    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
2139        HAVE_LONG_LONG is not defined.
2141    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
2142        bring them up to date and include new features. This patch includes:
2144        - Fixed PH's badly added libz and libbz2 support.
2145        - Fixed a problem with static linking.
2146        - Added pcredemo. [But later removed - see 7 below.]
2147        - Fixed dftables problem and added an option.
2148        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
2149            HAVE_LONG_LONG.
2150        - Added readline support for pcretest.
2151        - Added an listing of the option settings after cmake has run.
2153    4.  A user submitted a patch to Makefile that makes it easy to create
2154        "pcre.dll" under mingw when using Configure/Make. I added stuff to
2155        Makefile.am that cause it to include this special target, without
2156        affecting anything else. Note that the same mingw target plus all
2157        the other distribution libraries and programs are now supported
2158        when configuring with CMake (see 6 below) instead of with
2159        Configure/Make.
2161    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
2162        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
2163        exported in the Windows port". It has not yet been confirmed that the patch
2164        solves the problem, but it does no harm.
2166    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
2167        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
2168        with CMake, and also correct the comment about stack recursion.
2170    7.  Remove the automatic building of pcredemo from the ./configure system and
2171        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
2172        of a program that users should build themselves after PCRE is installed, so
2173        building it automatically is not really right. What is more, it gave
2174        trouble in some build environments.
2176    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
2179    Version 7.5 10-Jan-08
2180  ---------------------  ---------------------
2182  1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'  1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
2183      values in parens when parsing an RE using the C++ wrapper."      values in parens when parsing an RE using the C++ wrapper."
2185  2.  Negative specials like \S did not work in character classes in UTF-8 mode.  2.  Negative specials like \S did not work in character classes in UTF-8 mode.
2186      Characters greater than 255 were excluded from the class instead of being      Characters greater than 255 were excluded from the class instead of being
2187      included.      included.
2189  3.  The same bug as (2) above applied to negated POSIX classes such as  3.  The same bug as (2) above applied to negated POSIX classes such as
2190      [:^space:].      [:^space:].
2192  4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it  4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
2193      defined or documented. It seems to have been a typo for PCRE_STATIC, so      defined or documented. It seems to have been a typo for PCRE_STATIC, so
2194      I have changed it.      I have changed it.
2196  5.  The construct (?&) was not diagnosed as a syntax error (it referenced the  5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
2197      first named subpattern) and a construct such as (?&a) would reference the      first named subpattern) and a construct such as (?&a) would reference the
2198      first named subpattern whose name started with "a" (in other words, the      first named subpattern whose name started with "a" (in other words, the
2199      length check was missing).      length check was missing). Both these problems are fixed. "Subpattern name
2200        expected" is now given for (?&) (a zero-length name), and this patch also
2201        makes it give the same error for \k'' (previously it complained that that
2202        was a reference to a non-existent subpattern).
2204  6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;  6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
2205      this is right because (?- can be followed by option settings as well as by      this is right because (?- can be followed by option settings as well as by
2206      digits. I have, however, made the messages clearer.      digits. I have, however, made the messages clearer.
2208  7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns  7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
2209      than the number used in the conditional) now cause a compile-time error.      than the number used in the conditional) now cause a compile-time error.
2210      This is actually not compatible with Perl, which accepts such patterns, but      This is actually not compatible with Perl, which accepts such patterns, but
2211      treats the conditional as always being FALSE (as PCRE used to), but it      treats the conditional as always being FALSE (as PCRE used to), but it
2212      seems to me that giving a diagnostic is better.      seems to me that giving a diagnostic is better.
2214    8.  Change "alphameric" to the more common word "alphanumeric" in comments
2215        and messages.
2217    9.  Fix two occurrences of "backslash" in comments that should have been
2218        "backspace".
2220    10. Remove two redundant lines of code that can never be obeyed (their function
2221        was moved elsewhere).
2223    11. The program that makes PCRE's Unicode character property table had a bug
2224        which caused it to generate incorrect table entries for sequences of
2225        characters that have the same character type, but are in different scripts.
2226        It amalgamated them into a single range, with the script of the first of
2227        them. In other words, some characters were in the wrong script. There were
2228        thirteen such cases, affecting characters in the following ranges:
2230          U+002b0 - U+002c1
2231          U+0060c - U+0060d
2232          U+0061e - U+00612
2233          U+0064b - U+0065e
2234          U+0074d - U+0076d
2235          U+01800 - U+01805
2236          U+01d00 - U+01d77
2237          U+01d9b - U+01dbf
2238          U+0200b - U+0200f
2239          U+030fc - U+030fe
2240          U+03260 - U+0327f
2241          U+0fb46 - U+0fbb1
2242          U+10450 - U+1049d
2244    12. The -o option (show only the matching part of a line) for pcregrep was not
2245        compatible with GNU grep in that, if there was more than one match in a
2246        line, it showed only the first of them. It now behaves in the same way as
2247        GNU grep.
2249    13. If the -o and -v options were combined for pcregrep, it printed a blank
2250        line for every non-matching line. GNU grep prints nothing, and pcregrep now
2251        does the same. The return code can be used to tell if there were any
2252        non-matching lines.
2254    14. Added --file-offsets and --line-offsets to pcregrep.
2256    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
2257        infinitely looping recursion. The bug was that positive lookaheads were not
2258        being skipped when checking for a possible empty match (negative lookaheads
2259        and both kinds of lookbehind were skipped).
2261    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
2262        inclusion of <windows.h> to before rather than after the definition of
2263        INVALID_FILE_ATTRIBUTES (patch from David Byron).
2265    17. Specifying a possessive quantifier with a specific limit for a Unicode
2266        character property caused pcre_compile() to compile bad code, which led at
2267        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
2268        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
2269        caused the error; without that there was no problem.
2271    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
2273    19. Added --enable-pcretest-libreadline.
2275    20. In pcrecpp.cc, the variable 'count' was incremented twice in
2276        RE::GlobalReplace(). As a result, the number of replacements returned was
2277        double what it should be. I removed one of the increments, but Craig sent a
2278        later patch that removed the other one (the right fix) and added unit tests
2279        that check the return values (which was not done before).
2281    21. Several CMake things:
2283        (1) Arranged that, when cmake is used on Unix, the libraries end up with
2284            the names libpcre and libpcreposix, not just pcre and pcreposix.
2286        (2) The above change means that pcretest and pcregrep are now correctly
2287            linked with the newly-built libraries, not previously installed ones.
2291    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
2292        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
2293        UTF-8 newline character). The key issue is that the pattern starts .*;
2294        this means that the match must be either at the beginning, or after a
2295        newline. The bug was in the code for advancing after a failed match and
2296        checking that the new position followed a newline. It was not taking
2297        account of UTF-8 characters correctly.
2299    23. PCRE was behaving differently from Perl in the way it recognized POSIX
2300        character classes. PCRE was not treating the sequence [:...:] as a
2301        character class unless the ... were all letters. Perl, however, seems to
2302        allow any characters between [: and :], though of course it rejects as
2303        unknown any "names" that contain non-letters, because all the known class
2304        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
2305        for example, whereas PCRE did not - it did not recognize a POSIX character
2306        class. This seemed a bit dangerous, so the code has been changed to be
2307        closer to Perl. The behaviour is not identical to Perl, because PCRE will
2308        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
2309        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
2310        Perl does, and where it didn't before.
2312    24. Rewrite so as to remove the single use of %n from pcregrep because in some
2313        Windows environments %n is disabled by default.
2316  Version 7.4 21-Sep-07  Version 7.4 21-Sep-07
2317  ---------------------  ---------------------

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