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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 7.6 19-Jan-08  Version 8.32
5    ------------
7    1.  Improved JIT compiler optimizations for first character search and single
8        character iterators.
10    2.  Supporting IBM XL C compilers for PPC architectures in the JIT compiler.
11        Patch by Daniel Richard G.
13    3.  Single character iterator optimizations in the JIT compiler.
15    4.  Improved JIT compiler optimizations for character ranges.
17    5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
18        Reported by Giuseppe D'Angelo.
20    6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
21        of a line, was being set incorrectly in cases where .* appeared inside
22        atomic brackets at the start of a pattern, or where there was a subsequent
23        *PRUNE or *SKIP.
25    7.  Improved instruction cache flush for POWER/PowerPC.
26        Patch by Daniel Richard G.
28    8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
29        grep:
31        (a) There is now no limit to the number of patterns to be matched.
33        (b) An error is given if a pattern is too long.
35        (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
36            are now supported.
38        (d) --exclude-from and --include-from (multiple use) have been added.
40        (e) Exclusions and inclusions now apply to all files and directories, not
41            just to those obtained from scanning a directory recursively.
43        (f) Multiple uses of -f and --file-list are now supported.
45        (g) In a Windows environment, the default for -d has been changed from
46            "read" (the GNU grep default) to "skip", because otherwise the presence
47            of a directory in the file list provokes an error.
49        (h) The documentation has been revised and clarified in places.
51    9.  Improve the matching speed of capturing brackets.
53    10. Changed the meaning of \X so that it now matches a Unicode extended
54        grapheme cluster.
56    11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
57        out POSIX threads when JIT support is configured.
59    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
61    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
62        structure could go wrong in environments where size_t is not the same size
63        as int.
65    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
66        set.
68    15. The EBCDIC support had decayed; later updates to the code had included
69        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
70        general tidy up of EBCDIC-related issues, and the documentation was also
71        not quite right. There is now a test that can be run on ASCII systems to
72        check some of the EBCDIC-related things (but is it not a full test).
74    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
75        in a small tidy to the code.
77    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
79    18. If the --only-matching (-o) option in pcregrep is specified multiple
80        times, each one causes appropriate output. For example, -o1 -o2 outputs the
81        substrings matched by the 1st and 2nd capturing parentheses. A separating
82        string can be specified by --om-separator (default empty).
84    19. Improving the first n character searches.
86    20. Turn case lists for horizontal and vertical white space into macros so that
87        they are defined only once.
89    21. This set of changes together give more compatible Unicode case-folding
90        behaviour for characters that have more than one other case when UCP
91        support is available.
93        (a) The Unicode property table now has offsets into a new table of sets of
94            three or more characters that are case-equivalent. The MultiStage2.py
95            script that generates these tables (the pcre_ucd.c file) now scans
96            CaseFolding.txt instead of UnicodeData.txt for character case
97            information.
99        (b) The code for adding characters or ranges of characters to a character
100            class has been abstracted into a generalized function that also handles
101            case-independence. In UTF-mode with UCP support, this uses the new data
102            to handle characters with more than one other case.
104        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
105            whose other case is greater than 256 are now correctly matched
106            caselessly. Previously, the high codepoint matched the low one, but not
107            vice versa.
109        (d) The processing of \h, \H, \v, and \ in character classes now makes use
110            of the new class addition function, using character lists defined as
111            macros alongside the case definitions of 20 above.
113        (e) Caseless back references now work with characters that have more than
114            one other case.
116        (f) General caseless matching of characters with more than one other case
117            is supported.
119    22. Unicode character properties were updated from Unicode 6.2.0
121    23. Improved CMake support under Windows. Patch by Daniel Richard G.
124    Version 8.31 06-July-2012
125    -------------------------
127    1.  Fixing a wrong JIT test case and some compiler warnings.
129    2.  Removed a bashism from the RunTest script.
131    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
132        to unsigned type, result still unsigned" that was given by an MS compiler
133        on encountering the code "-sizeof(xxx)".
135    4.  Partial matching support is added to the JIT compiler.
137    5.  Fixed several bugs concerned with partial matching of items that consist
138        of more than one character:
140        (a) /^(..)\1/ did not partially match "aba" because checking references was
141            done on an "all or nothing" basis. This also applied to repeated
142            references.
144        (b) \R did not give a hard partial match if \r was found at the end of the
145            subject.
147        (c) \X did not give a hard partial match after matching one or more
148            characters at the end of the subject.
150        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
151            a partial match for the string "\r".
153        (e) When newline was set to CRLF, the metacharacter "." did not recognize
154            a partial match for a CR character at the end of the subject string.
156    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
157        running pcretest, the text "(JIT)" added to the output whenever JIT is
158        actually used to run the match.
160    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
161        or /S+[+] with a digit between 1 and 7.
163    8.  OP_NOT now supports any UTF character not just single-byte ones.
165    9.  (*MARK) control verb is now supported by the JIT compiler.
167    10. The command "./RunTest list" lists the available tests without actually
168        running any of them. (Because I keep forgetting what they all are.)
172    12. Applied a (slightly modified) user-supplied patch that improves performance
173        when the heap is used for recursion (compiled with --disable-stack-for-
174        recursion). Instead of malloc and free for each heap frame each time a
175        logical recursion happens, frames are retained on a chain and re-used where
176        possible. This sometimes gives as much as 30% improvement.
178    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
179        call.
181    14. As documented, (*COMMIT) is now confined to within a positive assertion.
183    15. It is now possible to link pcretest with libedit as an alternative to
184        libreadline.
186    16. (*COMMIT) control verb is now supported by the JIT compiler.
188    17. The Unicode data tables have been updated to Unicode 6.1.0.
190    18. Added --file-list option to pcregrep.
192    19. Added binary file support to pcregrep, including the -a, --binary-files,
193        -I, and --text options.
195    20. The madvise function is renamed for posix_madvise for QNX compatibility
196        reasons. Fixed by Giuseppe D'Angelo.
198    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
200    22. Changed the option for creating symbolic links for 16-bit man pages from
201        -s to -sf so that re-installing does not cause issues.
203    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
205    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
206        matches in certain environments (the workspace was not being correctly
207        retained). Also added to pcre_dfa_exec() a simple plausibility check on
208        some of the workspace data at the beginning of a restart.
210    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
211        was not doing so when it should - probably a typo introduced by SVN 528
212        (change 8.10/14).
214    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
215        \w+ when the character tables indicated that \x{c4} was a word character.
216        There were several related cases, all because the tests for doing a table
217        lookup were testing for characters less than 127 instead of 255.
219    27. If a pattern contains capturing parentheses that are not used in a match,
220        their slots in the ovector are set to -1. For those that are higher than
221        any matched groups, this happens at the end of processing. In the case when
222        there were back references that the ovector was too small to contain
223        (causing temporary malloc'd memory to be used during matching), and the
224        highest capturing number was not used, memory off the end of the ovector
225        was incorrectly being set to -1. (It was using the size of the temporary
226        memory instead of the true size.)
228    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
229        ovector size, it uses memory at the end of the block that it has got.
231    29. Check for an overlong MARK name and give an error at compile time. The
232        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
234    30. JIT compiler update.
236    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
237        Rill for the patch.
239    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
241    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
243    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
244        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
245        was enabled.
247    35. Improve JIT code generation for greedy plus quantifier.
249    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
250        1 to "aa" instead of to an empty string. The bug affected repeated groups
251        that could potentially match an empty string.
253    37. Optimizing single character iterators in JIT.
255    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
256        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
257        codepoints that are too big for the mode are faulted, and in a UTF mode,
258        disallowed codepoints are also faulted.
260    39. If PCRE was compiled with UTF support, in three places in the DFA
261        matcher there was code that should only have been obeyed in UTF mode, but
262        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
263        processing when bytes with values greater than 127 were present. In 16-bit
264        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
265        both cases the values are those that cannot be the first data item in a UTF
266        character. The three items that might have provoked this were recursions,
267        possessively repeated groups, and atomic groups.
269    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
270        and pcregrep, because some OS require shared objects to be explicitly
271        passed to ld, causing the link step to fail if they are not.
273    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
274        mode, patterns that started with \h* or \R* might be incorrectly matched.
277    Version 8.30 04-February-2012
278    -----------------------------
280    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
281        name is defined in ctype.h.
283    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
284        only in quite long subpatterns.
286    3.  Removed the function pcre_info(), which has been obsolete and deprecated
287        since it was replaced by pcre_fullinfo() in February 2000.
289    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
290        match a (*MARK), and the match failed at the start of the subject, a
291        reference to memory before the start of the subject could occur. This bug
292        was introduced by fix 17 of release 8.21.
294    5.  A reference to an unset group with zero minimum repetition was giving
295        totally wrong answers (in non-JavaScript-compatibility mode). For example,
296        /(another)?(\1?)test/ matched against "hello world test". This bug was
297        introduced in release 8.13.
299    6.  Add support for 16-bit character strings (a large amount of work involving
300        many changes and refactorings).
302    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
303        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
304        from a file.
306    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
307        rounding is not applied in this particular case).
309    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
310        if they appear, or are escaped, in patterns.
312    10. Get rid of a number of -Wunused-but-set-variable warnings.
314    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
315        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
316        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
317        also returns the mark "x". This bug applied to capturing parentheses,
318        non-capturing parentheses, and atomic parentheses. It also applied to some
319        assertions.
321    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
322        information out of configure.ac instead of relying on pcre.h.generic, which
323        is not stored in the repository.
325    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
326        -lreadline.
328    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
330    15. Applied Graycode's patch to put the top-level frame on the stack rather
331        than the heap when not using the stack for recursion. This gives a
332        performance improvement in many cases when recursion is not deep.
334    16. Experimental code added to "pcretest -C" to output the stack frame size.
337    Version 8.21 12-Dec-2011
338    ------------------------
340    1.  Updating the JIT compiler.
342    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
343        are added as well.
345    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
346        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
347        calling _pcre_jit_exec. Some extra comments are added.
349    4.  (*MARK) settings inside atomic groups that do not contain any capturing
350        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
351        was introduced by change 18 for 8.20.
353    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
354        ECMA-262 standard.
356    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
357        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
358        This bug was probably introduced by change 9 of 8.13.
360    7.  While fixing 6 above, I noticed that a number of other items were being
361        incorrectly rejected as "not fixed length". This arose partly because newer
362        opcodes had not been added to the fixed-length checking code. I have (a)
363        corrected the bug and added tests for these items, and (b) arranged for an
364        error to occur if an unknown opcode is encountered while checking for fixed
365        length instead of just assuming "not fixed length". The items that were
366        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
367        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
368        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
370    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
371        being incorrectly compiled and would have given unpredicatble results.
373    9.  A possessively repeated subpattern with minimum repeat count greater than
374        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
375        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
376        the first (A) could occur when it should not.
378    10. Add a cast and remove a redundant test from the code.
380    11. JIT should use pcre_malloc/pcre_free for allocation.
382    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
383        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
384        is anything other than /usr, -L is still shown).
386    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
388    14. Perl does not support \N without a following name in a [] class; PCRE now
389        also gives an error.
391    15. If a forward reference was repeated with an upper limit of around 2000,
392        it caused the error "internal error: overran compiling workspace". The
393        maximum number of forward references (including repeats) was limited by the
394        internal workspace, and dependent on the LINK_SIZE. The code has been
395        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
396        the default depends on LINK_SIZE. There is a new upper limit (for safety)
397        of around 200,000 forward references. While doing this, I also speeded up
398        the filling in of repeated forward references.
400    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
401        incorrectly expecting the subject to contain another "a" after the start.
403    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
404        in the match, the SKIP should be ignored. This was not happening; instead
405        the SKIP was being treated as NOMATCH. For patterns such as
406        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
407        tested.
409    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
410        now much more compatible with Perl, in particular in cases where the result
411        is a non-match for a non-anchored pattern. For example, if
412        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
413        "m", where previously it did not return a name. A side effect of this
414        change is that for partial matches, the last encountered mark name is
415        returned, as for non matches. A number of tests that were previously not
416        Perl-compatible have been moved into the Perl-compatible test files. The
417        refactoring has had the pleasing side effect of removing one argument from
418        the match() function, thus reducing its stack requirements.
420    19. If the /S+ option was used in pcretest to study a pattern using JIT,
421        subsequent uses of /S (without +) incorrectly behaved like /S+.
423    21. Retrieve executable code size support for the JIT compiler and fixing
424        some warnings.
426    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
427        not work when the shorter character appeared right at the end of the
428        subject string.
430    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
431        systems.
433    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
434        output it when the /M option is used in pcretest.
436    25. The CheckMan script was not being included in the distribution. Also, added
437        an explicit "perl" to run Perl scripts from the PrepareRelease script
438        because this is reportedly needed in Windows.
440    26. If study data was being save in a file and studying had not found a set of
441        "starts with" bytes for the pattern, the data written to the file (though
442        never used) was taken from uninitialized memory and so caused valgrind to
443        complain.
445    27. Updated RunTest.bat as provided by Sheri Pierce.
447    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
449    29. Computation of memory usage for the table of capturing group names was
450        giving an unnecessarily large value.
453    Version 8.20 21-Oct-2011
454    ------------------------
456    1.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had
457        a POSIX class. After further experiments with Perl, which convinced me that
458        Perl has bugs and confusions, a closing square bracket is no longer allowed
459        in a POSIX name. This bug also affected patterns with classes that started
460        with full stops.
462    2.  If a pattern such as /(a)b|ac/ is matched against "ac", there is no
463        captured substring, but while checking the failing first alternative,
464        substring 1 is temporarily captured. If the output vector supplied to
465        pcre_exec() was not big enough for this capture, the yield of the function
466        was still zero ("insufficient space for captured substrings"). This cannot
467        be totally fixed without adding another stack variable, which seems a lot
468        of expense for a edge case. However, I have improved the situation in cases
469        such as /(a)(b)x|abc/ matched against "abc", where the return code
470        indicates that fewer than the maximum number of slots in the ovector have
471        been set.
473    3.  Related to (2) above: when there are more back references in a pattern than
474        slots in the output vector, pcre_exec() uses temporary memory during
475        matching, and copies in the captures as far as possible afterwards. It was
476        using the entire output vector, but this conflicts with the specification
477        that only 2/3 is used for passing back captured substrings. Now it uses
478        only the first 2/3, for compatibility. This is, of course, another edge
479        case.
481    4.  Zoltan Herczeg's just-in-time compiler support has been integrated into the
482        main code base, and can be used by building with --enable-jit. When this is
483        done, pcregrep automatically uses it unless --disable-pcregrep-jit or the
484        runtime --no-jit option is given.
486    5.  When the number of matches in a pcre_dfa_exec() run exactly filled the
487        ovector, the return from the function was zero, implying that there were
488        other matches that did not fit. The correct "exactly full" value is now
489        returned.
491    6.  If a subpattern that was called recursively or as a subroutine contained
492        (*PRUNE) or any other control that caused it to give a non-standard return,
493        invalid errors such as "Error -26 (nested recursion at the same subject
494        position)" or even infinite loops could occur.
496    7.  If a pattern such as /a(*SKIP)c|b(*ACCEPT)|/ was studied, it stopped
497        computing the minimum length on reaching *ACCEPT, and so ended up with the
498        wrong value of 1 rather than 0. Further investigation indicates that
499        computing a minimum subject length in the presence of *ACCEPT is difficult
500        (think back references, subroutine calls), and so I have changed the code
501        so that no minimum is registered for a pattern that contains *ACCEPT.
503    8.  If (*THEN) was present in the first (true) branch of a conditional group,
504        it was not handled as intended. [But see 16 below.]
506    9.  Replaced RunTest.bat and CMakeLists.txt with improved versions provided by
507        Sheri Pierce.
509    10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that
510        the first byte in a match must be "a".
512    11. Change 17 for 8.13 increased the recursion depth for patterns like
513        /a(?:.)*?a/ drastically. I've improved things by remembering whether a
514        pattern contains any instances of (*THEN). If it does not, the old
515        optimizations are restored. It would be nice to do this on a per-group
516        basis, but at the moment that is not feasible.
518    12. In some environments, the output of pcretest -C is CRLF terminated. This
519        broke RunTest's code that checks for the link size. A single white space
520        character after the value is now allowed for.
522    13. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".
523        For "fr", it uses the Windows-specific input and output files.
525    14. If (*THEN) appeared in a group that was called recursively or as a
526        subroutine, it did not work as intended. [But see next item.]
528    15. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex
529        pattern fragments (but not containing any | characters). If A and B are
530        matched, but there is a failure in C so that it backtracks to (*THEN), PCRE
531        was behaving differently to Perl. PCRE backtracked into A, but Perl goes to
532        D. In other words, Perl considers parentheses that do not contain any |
533        characters to be part of a surrounding alternative, whereas PCRE was
534        treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles
535        differently. PCRE now behaves in the same way as Perl, except in the case
536        of subroutine/recursion calls such as (?1) which have in any case always
537        been different (but PCRE had them first :-).
539    16. Related to 15 above: Perl does not treat the | in a conditional group as
540        creating alternatives. Such a group is treated in the same way as an
541        ordinary group without any | characters when processing (*THEN). PCRE has
542        been changed to match Perl's behaviour.
544    17. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the
545        RunGrepTest script failed.
547    18. Change 22 for version 13 caused atomic groups to use more stack. This is
548        inevitable for groups that contain captures, but it can lead to a lot of
549        stack use in large patterns. The old behaviour has been restored for atomic
550        groups that do not contain any capturing parentheses.
552    19. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not
553        suppress the check for a minimum subject length at run time. (If it was
554        given to pcre_exec() or pcre_dfa_exec() it did work.)
556    20. Fixed an ASCII-dependent infelicity in pcretest that would have made it
557        fail to work when decoding hex characters in data strings in EBCDIC
558        environments.
560    21. It appears that in at least one Mac OS environment, the isxdigit() function
561        is implemented as a macro that evaluates to its argument more than once,
562        contravening the C 90 Standard (I haven't checked a later standard). There
563        was an instance in pcretest which caused it to go wrong when processing
564        \x{...} escapes in subject strings. The has been rewritten to avoid using
565        things like p++ in the argument of isxdigit().
568    Version 8.13 16-Aug-2011
569    ------------------------
571    1.  The Unicode data tables have been updated to Unicode 6.0.0.
573    2.  Two minor typos in pcre_internal.h have been fixed.
575    3.  Added #include <string.h> to pcre_scanner_unittest.cc, pcrecpp.cc, and
576        pcrecpp_unittest.cc. They are needed for strcmp(), memset(), and strchr()
577        in some environments (e.g. Solaris 10/SPARC using Sun Studio 12U2).
579    4.  There were a number of related bugs in the code for matching backrefences
580        caselessly in UTF-8 mode when codes for the characters concerned were
581        different numbers of bytes. For example, U+023A and U+2C65 are an upper
582        and lower case pair, using 2 and 3 bytes, respectively. The main bugs were:
583        (a) A reference to 3 copies of a 2-byte code matched only 2 of a 3-byte
584        code. (b) A reference to 2 copies of a 3-byte code would not match 2 of a
585        2-byte code at the end of the subject (it thought there wasn't enough data
586        left).
588    5.  Comprehensive information about what went wrong is now returned by
589        pcre_exec() and pcre_dfa_exec() when the UTF-8 string check fails, as long
590        as the output vector has at least 2 elements. The offset of the start of
591        the failing character and a reason code are placed in the vector.
593    6.  When the UTF-8 string check fails for pcre_compile(), the offset that is
594        now returned is for the first byte of the failing character, instead of the
595        last byte inspected. This is an incompatible change, but I hope it is small
596        enough not to be a problem. It makes the returned offset consistent with
597        pcre_exec() and pcre_dfa_exec().
599    7.  pcretest now gives a text phrase as well as the error number when
600        pcre_exec() or pcre_dfa_exec() fails; if the error is a UTF-8 check
601        failure, the offset and reason code are output.
603    8.  When \R was used with a maximizing quantifier it failed to skip backwards
604        over a \r\n pair if the subsequent match failed. Instead, it just skipped
605        back over a single character (\n). This seems wrong (because it treated the
606        two characters as a single entity when going forwards), conflicts with the
607        documentation that \R is equivalent to (?>\r\n|\n|...etc), and makes the
608        behaviour of \R* different to (\R)*, which also seems wrong. The behaviour
609        has been changed.
611    9.  Some internal refactoring has changed the processing so that the handling
612        of the PCRE_CASELESS and PCRE_MULTILINE options is done entirely at compile
613        time (the PCRE_DOTALL option was changed this way some time ago: version
614        7.7 change 16). This has made it possible to abolish the OP_OPT op code,
615        which was always a bit of a fudge. It also means that there is one less
616        argument for the match() function, which reduces its stack requirements
617        slightly. This change also fixes an incompatibility with Perl: the pattern
618        (?i:([^b]))(?1) should not match "ab", but previously PCRE gave a match.
620    10. More internal refactoring has drastically reduced the number of recursive
621        calls to match() for possessively repeated groups such as (abc)++ when
622        using pcre_exec().
624    11. While implementing 10, a number of bugs in the handling of groups were
625        discovered and fixed:
627        (?<=(a)+) was not diagnosed as invalid (non-fixed-length lookbehind).
628        (a|)*(?1) gave a compile-time internal error.
629        ((a|)+)+  did not notice that the outer group could match an empty string.
630        (^a|^)+   was not marked as anchored.
631        (.*a|.*)+ was not marked as matching at start or after a newline.
633    12. Yet more internal refactoring has removed another argument from the match()
634        function. Special calls to this function are now indicated by setting a
635        value in a variable in the "match data" data block.
637    13. Be more explicit in pcre_study() instead of relying on "default" for
638        opcodes that mean there is no starting character; this means that when new
639        ones are added and accidentally left out of pcre_study(), testing should
640        pick them up.
642    14. The -s option of pcretest has been documented for ages as being an old
643        synonym of -m (show memory usage). I have changed it to mean "force study
644        for every regex", that is, assume /S for every regex. This is similar to -i
645        and -d etc. It's slightly incompatible, but I'm hoping nobody is still
646        using it. It makes it easier to run collections of tests with and without
647        study enabled, and thereby test pcre_study() more easily. All the standard
648        tests are now run with and without -s (but some patterns can be marked as
649        "never study" - see 20 below).
651    15. When (*ACCEPT) was used in a subpattern that was called recursively, the
652        restoration of the capturing data to the outer values was not happening
653        correctly.
655    16. If a recursively called subpattern ended with (*ACCEPT) and matched an
656        empty string, and PCRE_NOTEMPTY was set, pcre_exec() thought the whole
657        pattern had matched an empty string, and so incorrectly returned a no
658        match.
660    17. There was optimizing code for the last branch of non-capturing parentheses,
661        and also for the obeyed branch of a conditional subexpression, which used
662        tail recursion to cut down on stack usage. Unfortunately, now that there is
663        the possibility of (*THEN) occurring in these branches, tail recursion is
664        no longer possible because the return has to be checked for (*THEN). These
665        two optimizations have therefore been removed. [But see 8.20/11 above.]
667    18. If a pattern containing \R was studied, it was assumed that \R always
668        matched two bytes, thus causing the minimum subject length to be
669        incorrectly computed because \R can also match just one byte.
671    19. If a pattern containing (*ACCEPT) was studied, the minimum subject length
672        was incorrectly computed.
674    20. If /S is present twice on a test pattern in pcretest input, it now
675        *disables* studying, thereby overriding the use of -s on the command line
676        (see 14 above). This is necessary for one or two tests to keep the output
677        identical in both cases.
679    21. When (*ACCEPT) was used in an assertion that matched an empty string and
680        PCRE_NOTEMPTY was set, PCRE applied the non-empty test to the assertion.
682    22. When an atomic group that contained a capturing parenthesis was
683        successfully matched, but the branch in which it appeared failed, the
684        capturing was not being forgotten if a higher numbered group was later
685        captured. For example, /(?>(a))b|(a)c/ when matching "ac" set capturing
686        group 1 to "a", when in fact it should be unset. This applied to multi-
687        branched capturing and non-capturing groups, repeated or not, and also to
688        positive assertions (capturing in negative assertions does not happen
689        in PCRE) and also to nested atomic groups.
691    23. Add the ++ qualifier feature to pcretest, to show the remainder of the
692        subject after a captured substring, to make it easier to tell which of a
693        number of identical substrings has been captured.
695    24. The way atomic groups are processed by pcre_exec() has been changed so that
696        if they are repeated, backtracking one repetition now resets captured
697        values correctly. For example, if ((?>(a+)b)+aabab) is matched against
698        "aaaabaaabaabab" the value of captured group 2 is now correctly recorded as
699        "aaa". Previously, it would have been "a". As part of this code
700        refactoring, the way recursive calls are handled has also been changed.
702    25. If an assertion condition captured any substrings, they were not passed
703        back unless some other capturing happened later. For example, if
704        (?(?=(a))a) was matched against "a", no capturing was returned.
706    26. When studying a pattern that contained subroutine calls or assertions,
707        the code for finding the minimum length of a possible match was handling
708        direct recursions such as (xxx(?1)|yyy) but not mutual recursions (where
709        group 1 called group 2 while simultaneously a separate group 2 called group
710        1). A stack overflow occurred in this case. I have fixed this by limiting
711        the recursion depth to 10.
713    27. Updated RunTest.bat in the distribution to the version supplied by Tom
714        Fortmann. This supports explicit test numbers on the command line, and has
715        argument validation and error reporting.
717    28. An instance of \X with an unlimited repeat could fail if at any point the
718        first character it looked at was a mark character.
720    29. Some minor code refactoring concerning Unicode properties and scripts
721        should reduce the stack requirement of match() slightly.
723    30. Added the '=' option to pcretest to check the setting of unused capturing
724        slots at the end of the pattern, which are documented as being -1, but are
725        not included in the return count.
727    31. If \k was not followed by a braced, angle-bracketed, or quoted name, PCRE
728        compiled something random. Now it gives a compile-time error (as does
729        Perl).
731    32. A *MARK encountered during the processing of a positive assertion is now
732        recorded and passed back (compatible with Perl).
734    33. If --only-matching or --colour was set on a pcregrep call whose pattern
735        had alternative anchored branches, the search for a second match in a line
736        was done as if at the line start. Thus, for example, /^01|^02/ incorrectly
737        matched the line "0102" twice. The same bug affected patterns that started
738        with a backwards assertion. For example /\b01|\b02/ also matched "0102"
739        twice.
741    34. Previously, PCRE did not allow quantification of assertions. However, Perl
742        does, and because of capturing effects, quantifying parenthesized
743        assertions may at times be useful. Quantifiers are now allowed for
744        parenthesized assertions.
746    35. A minor code tidy in pcre_compile() when checking options for \R usage.
748    36. \g was being checked for fancy things in a character class, when it should
749        just be a literal "g".
751    37. PCRE was rejecting [:a[:digit:]] whereas Perl was not. It seems that the
752        appearance of a nested POSIX class supersedes an apparent external class.
753        For example, [:a[:digit:]b:] matches "a", "b", ":", or a digit. Also,
754        unescaped square brackets may also appear as part of class names. For
755        example, [:a[:abc]b:] gives unknown class "[:abc]b:]". PCRE now behaves
756        more like Perl. (But see 8.20/1 above.)
758    38. PCRE was giving an error for \N with a braced quantifier such as {1,} (this
759        was because it thought it was \N{name}, which is not supported).
761    39. Add minix to OS list not supporting the -S option in pcretest.
763    40. PCRE tries to detect cases of infinite recursion at compile time, but it
764        cannot analyze patterns in sufficient detail to catch mutual recursions
765        such as ((?1))((?2)). There is now a runtime test that gives an error if a
766        subgroup is called recursively as a subpattern for a second time at the
767        same position in the subject string. In previous releases this might have
768        been caught by the recursion limit, or it might have run out of stack.
770    41. A pattern such as /(?(R)a+|(?R)b)/ is quite safe, as the recursion can
771        happen only once. PCRE was, however incorrectly giving a compile time error
772        "recursive call could loop indefinitely" because it cannot analyze the
773        pattern in sufficient detail. The compile time test no longer happens when
774        PCRE is compiling a conditional subpattern, but actual runaway loops are
775        now caught at runtime (see 40 above).
777    42. It seems that Perl allows any characters other than a closing parenthesis
778        to be part of the NAME in (*MARK:NAME) and other backtracking verbs. PCRE
779        has been changed to be the same.
781    43. Updated configure.ac to put in more quoting round AC_LANG_PROGRAM etc. so
782        as not to get warnings when autogen.sh is called. Also changed
783        AC_PROG_LIBTOOL (deprecated) to LT_INIT (the current macro).
785    44. To help people who use pcregrep to scan files containing exceedingly long
786        lines, the following changes have been made:
788        (a) The default value of the buffer size parameter has been increased from
789            8K to 20K. (The actual buffer used is three times this size.)
791        (b) The default can be changed by ./configure --with-pcregrep-bufsize when
792            PCRE is built.
794        (c) A --buffer-size=n option has been added to pcregrep, to allow the size
795            to be set at run time.
797        (d) Numerical values in pcregrep options can be followed by K or M, for
798            example --buffer-size=50K.
800        (e) If a line being scanned overflows pcregrep's buffer, an error is now
801            given and the return code is set to 2.
803    45. Add a pointer to the latest mark to the callout data block.
805    46. The pattern /.(*F)/, when applied to "abc" with PCRE_PARTIAL_HARD, gave a
806        partial match of an empty string instead of no match. This was specific to
807        the use of ".".
809    47. The pattern /f.*/8s, when applied to "for" with PCRE_PARTIAL_HARD, gave a
810        complete match instead of a partial match. This bug was dependent on both
811        the PCRE_UTF8 and PCRE_DOTALL options being set.
813    48. For a pattern such as /\babc|\bdef/ pcre_study() was failing to set up the
814        starting byte set, because \b was not being ignored.
817    Version 8.12 15-Jan-2011
818    ------------------------
820    1.  Fixed some typos in the markup of the man pages, and wrote a script that
821        checks for such things as part of the documentation building process.
823    2.  On a big-endian 64-bit system, pcregrep did not correctly process the
824        --match-limit and --recursion-limit options (added for 8.11). In
825        particular, this made one of the standard tests fail. (The integer value
826        went into the wrong half of a long int.)
828    3.  If the --colour option was given to pcregrep with -v (invert match), it
829        did strange things, either producing crazy output, or crashing. It should,
830        of course, ignore a request for colour when reporting lines that do not
831        match.
833    4.  Another pcregrep bug caused similar problems if --colour was specified with
834        -M (multiline) and the pattern match finished with a line ending.
836    5.  In pcregrep, when a pattern that ended with a literal newline sequence was
837        matched in multiline mode, the following line was shown as part of the
838        match. This seems wrong, so I have changed it.
840    6.  Another pcregrep bug in multiline mode, when --colour was specified, caused
841        the check for further matches in the same line (so they could be coloured)
842        to overrun the end of the current line. If another match was found, it was
843        incorrectly shown (and then shown again when found in the next line).
845    7.  If pcregrep was compiled under Windows, there was a reference to the
846        function pcregrep_exit() before it was defined. I am assuming this was
847        the cause of the "error C2371: 'pcregrep_exit' : redefinition;" that was
848        reported by a user. I've moved the definition above the reference.
851    Version 8.11 10-Dec-2010
852    ------------------------
854    1.  (*THEN) was not working properly if there were untried alternatives prior
855        to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
856        backtracked to try for "b" instead of moving to the next alternative branch
857        at the same level (in this case, to look for "c"). The Perl documentation
858        is clear that when (*THEN) is backtracked onto, it goes to the "next
859        alternative in the innermost enclosing group".
861    2.  (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
862        such as   (A(*COMMIT)B(*THEN)C|D)  any failure after matching A should
863        result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
864        (*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
865        (*THEN).
867    3.  If \s appeared in a character class, it removed the VT character from
868        the class, even if it had been included by some previous item, for example
869        in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
870        of \s, but is part of the POSIX "space" class.)
872    4.  A partial match never returns an empty string (because you can always
873        match an empty string at the end of the subject); however the checking for
874        an empty string was starting at the "start of match" point. This has been
875        changed to the "earliest inspected character" point, because the returned
876        data for a partial match starts at this character. This means that, for
877        example, /(?<=abc)def/ gives a partial match for the subject "abc"
878        (previously it gave "no match").
880    5.  Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
881        of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
882        previously a full match would be given. However, setting PCRE_PARTIAL_HARD
883        has an implication that the given string is incomplete (because a partial
884        match is preferred over a full match). For this reason, these items now
885        give a partial match in this situation. [Aside: previously, the one case
886        /t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
887        match rather than a full match, which was wrong by the old rules, but is
888        now correct.]
890    6.  There was a bug in the handling of #-introduced comments, recognized when
891        PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
892        If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
893        UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
894        scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
895        but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
896        places in pcre_compile().
898    7.  Related to (6) above, when pcre_compile() was skipping #-introduced
899        comments when looking ahead for named forward references to subpatterns,
900        the only newline sequence it recognized was NL. It now handles newlines
901        according to the set newline convention.
903    8.  SunOS4 doesn't have strerror() or strtoul(); pcregrep dealt with the
904        former, but used strtoul(), whereas pcretest avoided strtoul() but did not
905        cater for a lack of strerror(). These oversights have been fixed.
907    9.  Added --match-limit and --recursion-limit to pcregrep.
909    10. Added two casts needed to build with Visual Studio when NO_RECURSE is set.
911    11. When the -o option was used, pcregrep was setting a return code of 1, even
912        when matches were found, and --line-buffered was not being honoured.
914    12. Added an optional parentheses number to the -o and --only-matching options
915        of pcregrep.
917    13. Imitating Perl's /g action for multiple matches is tricky when the pattern
918        can match an empty string. The code to do it in pcretest and pcredemo
919        needed fixing:
921        (a) When the newline convention was "crlf", pcretest got it wrong, skipping
922            only one byte after an empty string match just before CRLF (this case
923            just got forgotten; "any" and "anycrlf" were OK).
925        (b) The pcretest code also had a bug, causing it to loop forever in UTF-8
926            mode when an empty string match preceded an ASCII character followed by
927            a non-ASCII character. (The code for advancing by one character rather
928            than one byte was nonsense.)
930        (c) The pcredemo.c sample program did not have any code at all to handle
931            the cases when CRLF is a valid newline sequence.
933    14. Neither pcre_exec() nor pcre_dfa_exec() was checking that the value given
934        as a starting offset was within the subject string. There is now a new
935        error, PCRE_ERROR_BADOFFSET, which is returned if the starting offset is
936        negative or greater than the length of the string. In order to test this,
937        pcretest is extended to allow the setting of negative starting offsets.
939    15. In both pcre_exec() and pcre_dfa_exec() the code for checking that the
940        starting offset points to the beginning of a UTF-8 character was
941        unnecessarily clumsy. I tidied it up.
943    16. Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
944        bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
946    17. Nobody had reported that the --include_dir option, which was added in
947        release 7.7 should have been called --include-dir (hyphen, not underscore)
948        for compatibility with GNU grep. I have changed it to --include-dir, but
949        left --include_dir as an undocumented synonym, and the same for
950        --exclude-dir, though that is not available in GNU grep, at least as of
951        release 2.5.4.
953    18. At a user's suggestion, the macros GETCHAR and friends (which pick up UTF-8
954        characters from a string of bytes) have been redefined so as not to use
955        loops, in order to improve performance in some environments. At the same
956        time, I abstracted some of the common code into auxiliary macros to save
957        repetition (this should not affect the compiled code).
959    19. If \c was followed by a multibyte UTF-8 character, bad things happened. A
960        compile-time error is now given if \c is not followed by an ASCII
961        character, that is, a byte less than 128. (In EBCDIC mode, the code is
962        different, and any byte value is allowed.)
964    20. Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
965        START_OPTIMIZE option, which is now allowed at compile time - but just
966        passed through to pcre_exec() or pcre_dfa_exec(). This makes it available
967        to pcregrep and other applications that have no direct access to PCRE
968        options. The new /Y option in pcretest sets this option when calling
969        pcre_compile().
971    21. Change 18 of release 8.01 broke the use of named subpatterns for recursive
972        back references. Groups containing recursive back references were forced to
973        be atomic by that change, but in the case of named groups, the amount of
974        memory required was incorrectly computed, leading to "Failed: internal
975        error: code overflow". This has been fixed.
977    22. Some patches to pcre_stringpiece.h, pcre_stringpiece_unittest.cc, and
978        pcretest.c, to avoid build problems in some Borland environments.
981    Version 8.10 25-Jun-2010
982    ------------------------
984    1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
985        THEN.
987    2.  (*ACCEPT) was not working when inside an atomic group.
989    3.  Inside a character class, \B is treated as a literal by default, but
990        faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
991        causes the error). The code is unchanged, but I tidied the documentation.
993    4.  Inside a character class, PCRE always treated \R and \X as literals,
994        whereas Perl faults them if its -w option is set. I have changed PCRE so
995        that it faults them when PCRE_EXTRA is set.
997    5.  Added support for \N, which always matches any character other than
998        newline. (It is the same as "." when PCRE_DOTALL is not set.)
1000    6.  When compiling pcregrep with newer versions of gcc which may have
1001        FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
1002        declared with attribute warn_unused_result" were given. Just casting the
1003        result to (void) does not stop the warnings; a more elaborate fudge is
1004        needed. I've used a macro to implement this.
1006    7.  Minor change to pcretest.c to avoid a compiler warning.
1008    8.  Added four artifical Unicode properties to help with an option to make
1009        \s etc use properties (see next item). The new properties are: Xan
1010        (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
1012    9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
1013        use Unicode properties. (*UCP) at the start of a pattern can be used to set
1014        this option. Modified pcretest to add /W to test this facility. Added
1015        REG_UCP to make it available via the POSIX interface.
1017    10. Added --line-buffered to pcregrep.
1019    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
1020        studied, and the match started with a letter with a code point greater than
1021        127 whose first byte was different to the first byte of the other case of
1022        the letter, the other case of this starting letter was not recognized
1023        (#976).
1025    12. If a pattern that was studied started with a repeated Unicode property
1026        test, for example, \p{Nd}+, there was the theoretical possibility of
1027        setting up an incorrect bitmap of starting bytes, but fortunately it could
1028        not have actually happened in practice until change 8 above was made (it
1029        added property types that matched character-matching opcodes).
1031    13. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
1032        possible starting bytes for non-anchored patterns.
1034    14. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes
1035        \R, and also a number of cases that involve Unicode properties, both
1036        explicit and implicit when PCRE_UCP is set.
1038    15. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
1039        input, it could crash or give wrong results if characters with values
1040        greater than 0xc0 were present in the subject string. (Detail: it assumed
1041        UTF-8 input when processing these items.)
1043    16. Added a lot of (int) casts to avoid compiler warnings in systems where
1044        size_t is 64-bit (#991).
1046    17. Added a check for running out of memory when PCRE is compiled with
1047        --disable-stack-for-recursion (#990).
1049    18. If the last data line in a file for pcretest does not have a newline on
1050        the end, a newline was missing in the output.
1052    19. The default pcre_chartables.c file recognizes only ASCII characters (values
1053        less than 128) in its various bitmaps. However, there is a facility for
1054        generating tables according to the current locale when PCRE is compiled. It
1055        turns out that in some environments, 0x85 and 0xa0, which are Unicode space
1056        characters, are recognized by isspace() and therefore were getting set in
1057        these tables, and indeed these tables seem to approximate to ISO 8859. This
1058        caused a problem in UTF-8 mode when pcre_study() was used to create a list
1059        of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
1060        which of course cannot start UTF-8 characters. I have changed the code so
1061        that only real ASCII characters (less than 128) and the correct starting
1062        bytes for UTF-8 encodings are set for characters greater than 127 when in
1063        UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
1064        altogether.)
1066    20. Added the /T option to pcretest so as to be able to run tests with non-
1067        standard character tables, thus making it possible to include the tests
1068        used for 19 above in the standard set of tests.
1070    21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
1071        reference to a subpattern the other side of a comment that contains an
1072        opening parenthesis caused either an internal compiling error, or a
1073        reference to the wrong subpattern.
1076    Version 8.02 19-Mar-2010
1077    ------------------------
1079    1.  The Unicode data tables have been updated to Unicode 5.2.0.
1081    2.  Added the option --libs-cpp to pcre-config, but only when C++ support is
1082        configured.
1084    3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the
1085        original author of that file, following a query about its status.
1087    4.  On systems that do not have stdint.h (e.g. Solaris), check for and include
1088        inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.
1090    5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
1091        quantifier applied to a forward-referencing subroutine call, could compile
1092        incorrect code or give the error "internal error: previously-checked
1093        referenced subpattern not found".
1095    6.  Both MS Visual Studio and Symbian OS have problems with initializing
1096        variables to point to external functions. For these systems, therefore,
1097        pcre_malloc etc. are now initialized to local functions that call the
1098        relevant global functions.
1100    7.  There were two entries missing in the vectors called coptable and poptable
1101        in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.
1102        I've fixed the data, and added a kludgy way of testing at compile time that
1103        the lengths are correct (equal to the number of opcodes).
1105    8.  Following on from 7, I added a similar kludge to check the length of the
1106        eint vector in pcreposix.c.
1108    9.  Error texts for pcre_compile() are held as one long string to avoid too
1109        much relocation at load time. To find a text, the string is searched,
1110        counting zeros. There was no check for running off the end of the string,
1111        which could happen if a new error number was added without updating the
1112        string.
1114    10. \K gave a compile-time error if it appeared in a lookbehind assersion.
1116    11. \K was not working if it appeared in an atomic group or in a group that
1117        was called as a "subroutine", or in an assertion. Perl 5.11 documents that
1118        \K is "not well defined" if used in an assertion. PCRE now accepts it if
1119        the assertion is positive, but not if it is negative.
1121    12. Change 11 fortuitously reduced the size of the stack frame used in the
1122        "match()" function of pcre_exec.c by one pointer. Forthcoming
1123        implementation of support for (*MARK) will need an extra pointer on the
1124        stack; I have reserved it now, so that the stack frame size does not
1125        decrease.
1127    13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other
1128        item in branch that calls a recursion is a subroutine call - as in the
1129        second branch in the above example - was incorrectly given the compile-
1130        time error "recursive call could loop indefinitely" because pcre_compile()
1131        was not correctly checking the subroutine for matching a non-empty string.
1133    14. The checks for overrunning compiling workspace could trigger after an
1134        overrun had occurred. This is a "should never occur" error, but it can be
1135        triggered by pathological patterns such as hundreds of nested parentheses.
1136        The checks now trigger 100 bytes before the end of the workspace.
1138    15. Fix typo in configure.ac: "srtoq" should be "strtoq".
1141    Version 8.01 19-Jan-2010
1142    ------------------------
1144    1.  If a pattern contained a conditional subpattern with only one branch (in
1145        particular, this includes all (*DEFINE) patterns), a call to pcre_study()
1146        computed the wrong minimum data length (which is of course zero for such
1147        subpatterns). This could cause incorrect "no match" results.
1149    2.  For patterns such as (?i)a(?-i)b|c where an option setting at the start of
1150        the pattern is reset in the first branch, pcre_compile() failed with
1151        "internal error: code overflow at offset...". This happened only when
1152        the reset was to the original external option setting. (An optimization
1153        abstracts leading options settings into an external setting, which was the
1154        cause of this.)
1156    3.  A pattern such as ^(?!a(*SKIP)b) where a negative assertion contained one
1157        of the verbs SKIP, PRUNE, or COMMIT, did not work correctly. When the
1158        assertion pattern did not match (meaning that the assertion was true), it
1159        was incorrectly treated as false if the SKIP had been reached during the
1160        matching. This also applied to assertions used as conditions.
1162    4.  If an item that is not supported by pcre_dfa_exec() was encountered in an
1163        assertion subpattern, including such a pattern used as a condition,
1164        unpredictable results occurred, instead of the error return
1167    5.  The C++ GlobalReplace function was not working like Perl for the special
1168        situation when an empty string is matched. It now does the fancy magic
1169        stuff that is necessary.
1171    6.  In pcre_internal.h, obsolete includes to setjmp.h and stdarg.h have been
1172        removed. (These were left over from very, very early versions of PCRE.)
1174    7.  Some cosmetic changes to the code to make life easier when compiling it
1175        as part of something else:
1177        (a) Change DEBUG to PCRE_DEBUG.
1179        (b) In pcre_compile(), rename the member of the "branch_chain" structure
1180            called "current" as "current_branch", to prevent a collision with the
1181            Linux macro when compiled as a kernel module.
1183        (c) In pcre_study(), rename the function set_bit() as set_table_bit(), to
1184            prevent a collision with the Linux macro when compiled as a kernel
1185            module.
1187    8.  In pcre_compile() there are some checks for integer overflows that used to
1188        cast potentially large values to (double). This has been changed to that
1189        when building, a check for int64_t is made, and if it is found, it is used
1190        instead, thus avoiding the use of floating point arithmetic. (There is no
1191        other use of FP in PCRE.) If int64_t is not found, the fallback is to
1192        double.
1194    9.  Added two casts to avoid signed/unsigned warnings from VS Studio Express
1195        2005 (difference between two addresses compared to an unsigned value).
1197    10. Change the standard AC_CHECK_LIB test for libbz2 in configure.ac to a
1198        custom one, because of the following reported problem in Windows:
1200          - libbz2 uses the Pascal calling convention (WINAPI) for the functions
1201              under Win32.
1202          - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",
1203              therefore missing the function definition.
1204          - The compiler thus generates a "C" signature for the test function.
1205          - The linker fails to find the "C" function.
1206          - PCRE fails to configure if asked to do so against libbz2.
1208    11. When running libtoolize from libtool-2.2.6b as part of autogen.sh, these
1209        messages were output:
1211          Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and
1212          rerunning libtoolize, to keep the correct libtool macros in-tree.
1213          Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
1215        I have done both of these things.
1217    12. Although pcre_dfa_exec() does not use nearly as much stack as pcre_exec()
1218        most of the time, it *can* run out if it is given a pattern that contains a
1219        runaway infinite recursion. I updated the discussion in the pcrestack man
1220        page.
1222    13. Now that we have gone to the x.xx style of version numbers, the minor
1223        version may start with zero. Using 08 or 09 is a bad idea because users
1224        might check the value of PCRE_MINOR in their code, and 08 or 09 may be
1225        interpreted as invalid octal numbers. I've updated the previous comment in
1226        configure.ac, and also added a check that gives an error if 08 or 09 are
1227        used.
1229    14. Change 8.00/11 was not quite complete: code had been accidentally omitted,
1230        causing partial matching to fail when the end of the subject matched \W
1231        in a UTF-8 pattern where \W was quantified with a minimum of 3.
1233    15. There were some discrepancies between the declarations in pcre_internal.h
1234        of _pcre_is_newline(), _pcre_was_newline(), and _pcre_valid_utf8() and
1235        their definitions. The declarations used "const uschar *" and the
1236        definitions used USPTR. Even though USPTR is normally defined as "const
1237        unsigned char *" (and uschar is typedeffed as "unsigned char"), it was
1238        reported that: "This difference in casting confuses some C++ compilers, for
1239        example, SunCC recognizes above declarations as different functions and
1240        generates broken code for hbpcre." I have changed the declarations to use
1241        USPTR.
1243    16. GNU libtool is named differently on some systems. The autogen.sh script now
1244        tries several variants such as glibtoolize (MacOSX) and libtoolize1x
1245        (FreeBSD).
1247    17. Applied Craig's patch that fixes an HP aCC compile error in pcre 8.00
1248        (strtoXX undefined when compiling pcrecpp.cc). The patch contains this
1249        comment: "Figure out how to create a longlong from a string: strtoll and
1250        equivalent. It's not enough to call AC_CHECK_FUNCS: hpux has a strtoll, for
1251        instance, but it only takes 2 args instead of 3!"
1253    18. A subtle bug concerned with back references has been fixed by a change of
1254        specification, with a corresponding code fix. A pattern such as
1255        ^(xa|=?\1a)+$ which contains a back reference inside the group to which it
1256        refers, was giving matches when it shouldn't. For example, xa=xaaa would
1257        match that pattern. Interestingly, Perl (at least up to 5.11.3) has the
1258        same bug. Such groups have to be quantified to be useful, or contained
1259        inside another quantified group. (If there's no repetition, the reference
1260        can never match.) The problem arises because, having left the group and
1261        moved on to the rest of the pattern, a later failure that backtracks into
1262        the group uses the captured value from the final iteration of the group
1263        rather than the correct earlier one. I have fixed this in PCRE by forcing
1264        any group that contains a reference to itself to be an atomic group; that
1265        is, there cannot be any backtracking into it once it has completed. This is
1266        similar to recursive and subroutine calls.
1269    Version 8.00 19-Oct-09
1270    ----------------------
1272    1.  The table for translating pcre_compile() error codes into POSIX error codes
1273        was out-of-date, and there was no check on the pcre_compile() error code
1274        being within the table. This could lead to an OK return being given in
1275        error.
1277    2.  Changed the call to open a subject file in pcregrep from fopen(pathname,
1278        "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
1279        in a Windows environment.
1281    3.  The pcregrep --count option prints the count for each file even when it is
1282        zero, as does GNU grep. However, pcregrep was also printing all files when
1283        --files-with-matches was added. Now, when both options are given, it prints
1284        counts only for those files that have at least one match. (GNU grep just
1285        prints the file name in this circumstance, but including the count seems
1286        more useful - otherwise, why use --count?) Also ensured that the
1287        combination -clh just lists non-zero counts, with no names.
1289    4.  The long form of the pcregrep -F option was incorrectly implemented as
1290        --fixed_strings instead of --fixed-strings. This is an incompatible change,
1291        but it seems right to fix it, and I didn't think it was worth preserving
1292        the old behaviour.
1294    5.  The command line items --regex=pattern and --regexp=pattern were not
1295        recognized by pcregrep, which required --regex pattern or --regexp pattern
1296        (with a space rather than an '='). The man page documented the '=' forms,
1297        which are compatible with GNU grep; these now work.
1299    6.  No libpcreposix.pc file was created for pkg-config; there was just
1300        libpcre.pc and libpcrecpp.pc. The omission has been rectified.
1302    7.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
1303        when UCP support is not needed, by modifying the Python script that
1304        generates it from Unicode data files. This should not matter if the module
1305        is correctly used as a library, but I received one complaint about 50K of
1306        unwanted data. My guess is that the person linked everything into his
1307        program rather than using a library. Anyway, it does no harm.
1309    8.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
1310        was a minimum greater than 1 for a wide character in a possessive
1311        repetition. The same bug could also affect patterns like /(\x{ff}{0,2})*/8
1312        which had an unlimited repeat of a nested, fixed maximum repeat of a wide
1313        character. Chaos in the form of incorrect output or a compiling loop could
1314        result.
1316    9.  The restrictions on what a pattern can contain when partial matching is
1317        requested for pcre_exec() have been removed. All patterns can now be
1318        partially matched by this function. In addition, if there are at least two
1319        slots in the offset vector, the offset of the earliest inspected character
1320        for the match and the offset of the end of the subject are set in them when
1321        PCRE_ERROR_PARTIAL is returned.
1323    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
1324        synonymous with PCRE_PARTIAL, for backwards compatibility, and
1325        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
1326        and may be more useful for multi-segment matching.
1328    11. Partial matching with pcre_exec() is now more intuitive. A partial match
1329        used to be given if ever the end of the subject was reached; now it is
1330        given only if matching could not proceed because another character was
1331        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
1332        string "Z", which now yields "no match" instead of "partial match". In the
1333        case of pcre_dfa_exec(), "no match" is given if every matching path for the
1334        final character ended with (*FAIL).
1336    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
1337        if the pattern had a "must contain" character that was already found in the
1338        earlier partial match, unless partial matching was again requested. For
1339        example, with the pattern /dog.(body)?/, the "must contain" character is
1340        "g". If the first part-match was for the string "dog", restarting with
1341        "sbody" failed. This bug has been fixed.
1343    13. The string returned by pcre_dfa_exec() after a partial match has been
1344        changed so that it starts at the first inspected character rather than the
1345        first character of the match. This makes a difference only if the pattern
1346        starts with a lookbehind assertion or \b or \B (\K is not supported by
1347        pcre_dfa_exec()). It's an incompatible change, but it makes the two
1348        matching functions compatible, and I think it's the right thing to do.
1350    14. Added a pcredemo man page, created automatically from the pcredemo.c file,
1351        so that the demonstration program is easily available in environments where
1352        PCRE has not been installed from source.
1354    15. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
1355        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
1356        library.
1358    16. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
1359        It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
1360        is not the first non-POSIX option to be added. Clearly some people find
1361        these options useful.
1363    17. If a caller to the POSIX matching function regexec() passes a non-zero
1364        value for nmatch with a NULL value for pmatch, the value of
1365        nmatch is forced to zero.
1367    18. RunGrepTest did not have a test for the availability of the -u option of
1368        the diff command, as RunTest does. It now checks in the same way as
1369        RunTest, and also checks for the -b option.
1371    19. If an odd number of negated classes containing just a single character
1372        interposed, within parentheses, between a forward reference to a named
1373        subpattern and the definition of the subpattern, compilation crashed with
1374        an internal error, complaining that it could not find the referenced
1375        subpattern. An example of a crashing pattern is /(?&A)(([^m])(?<A>))/.
1376        [The bug was that it was starting one character too far in when skipping
1377        over the character class, thus treating the ] as data rather than
1378        terminating the class. This meant it could skip too much.]
1380    20. Added PCRE_NOTEMPTY_ATSTART in order to be able to correctly implement the
1381        /g option in pcretest when the pattern contains \K, which makes it possible
1382        to have an empty string match not at the start, even when the pattern is
1383        anchored. Updated pcretest and pcredemo to use this option.
1385    21. If the maximum number of capturing subpatterns in a recursion was greater
1386        than the maximum at the outer level, the higher number was returned, but
1387        with unset values at the outer level. The correct (outer level) value is
1388        now given.
1390    22. If (*ACCEPT) appeared inside capturing parentheses, previous releases of
1391        PCRE did not set those parentheses (unlike Perl). I have now found a way to
1392        make it do so. The string so far is captured, making this feature
1393        compatible with Perl.
1395    23. The tests have been re-organized, adding tests 11 and 12, to make it
1396        possible to check the Perl 5.10 features against Perl 5.10.
1398    24. Perl 5.10 allows subroutine calls in lookbehinds, as long as the subroutine
1399        pattern matches a fixed length string. PCRE did not allow this; now it
1400        does. Neither allows recursion.
1402    25. I finally figured out how to implement a request to provide the minimum
1403        length of subject string that was needed in order to match a given pattern.
1404        (It was back references and recursion that I had previously got hung up
1405        on.) This code has now been added to pcre_study(); it finds a lower bound
1406        to the length of subject needed. It is not necessarily the greatest lower
1407        bound, but using it to avoid searching strings that are too short does give
1408        some useful speed-ups. The value is available to calling programs via
1409        pcre_fullinfo().
1411    26. While implementing 25, I discovered to my embarrassment that pcretest had
1412        not been passing the result of pcre_study() to pcre_dfa_exec(), so the
1413        study optimizations had never been tested with that matching function.
1414        Oops. What is worse, even when it was passed study data, there was a bug in
1415        pcre_dfa_exec() that meant it never actually used it. Double oops. There
1416        were also very few tests of studied patterns with pcre_dfa_exec().
1418    27. If (?| is used to create subpatterns with duplicate numbers, they are now
1419        allowed to have the same name, even if PCRE_DUPNAMES is not set. However,
1420        on the other side of the coin, they are no longer allowed to have different
1421        names, because these cannot be distinguished in PCRE, and this has caused
1422        confusion. (This is a difference from Perl.)
1424    28. When duplicate subpattern names are present (necessarily with different
1425        numbers, as required by 27 above), and a test is made by name in a
1426        conditional pattern, either for a subpattern having been matched, or for
1427        recursion in such a pattern, all the associated numbered subpatterns are
1428        tested, and the overall condition is true if the condition is true for any
1429        one of them. This is the way Perl works, and is also more like the way
1430        testing by number works.
1433    Version 7.9 11-Apr-09
1434    ---------------------
1436    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
1437        (pcretest), all targets were linked against these libraries. This included
1438        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
1439        libraries. This caused unwanted dependencies to be created. This problem
1440        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
1441        pcretest is linked with readline.
1443    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
1444        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
1445        moved outside it again, because FALSE and TRUE are already defined in AIX,
1446        but BOOL is not.
1448    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
1449        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
1451    4.  The pcregrep documentation said spaces were inserted as well as colons (or
1452        hyphens) following file names and line numbers when outputting matching
1453        lines. This is not true; no spaces are inserted. I have also clarified the
1454        wording for the --colour (or --color) option.
1456    5.  In pcregrep, when --colour was used with -o, the list of matching strings
1457        was not coloured; this is different to GNU grep, so I have changed it to be
1458        the same.
1460    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
1461        each matching line was coloured. Now it goes on to look for further matches
1462        of any of the test patterns, which is the same behaviour as GNU grep.
1464    7.  A pattern that could match an empty string could cause pcregrep to loop; it
1465        doesn't make sense to accept an empty string match in pcregrep, so I have
1466        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
1467        seems to be how GNU grep behaves.
1469    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
1470        start or after a newline", because the conditional assertion was not being
1471        correctly handled. The rule now is that both the assertion and what follows
1472        in the first alternative must satisfy the test.
1474    9.  If auto-callout was enabled in a pattern with a conditional group whose
1475        condition was an assertion, PCRE could crash during matching, both with
1476        pcre_exec() and pcre_dfa_exec().
1478    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
1479        used for matching.
1481    11. Unicode property support in character classes was not working for
1482        characters (bytes) greater than 127 when not in UTF-8 mode.
1484    12. Added the -M command line option to pcretest.
1486    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
1488    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
1490    16. Added comments and documentation about mis-use of no_arg in the C++
1491        wrapper.
1493    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
1494        from Martin Jerabek that uses macro names for all relevant character and
1495        string constants.
1497    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
1498        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
1499        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
1500        these, but not everybody uses configure.
1502    19. A conditional group that had only one branch was not being correctly
1503        recognized as an item that could match an empty string. This meant that an
1504        enclosing group might also not be so recognized, causing infinite looping
1505        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
1506        with the subject "ab", where knowledge that the repeated group can match
1507        nothing is needed in order to break the loop.
1509    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
1510        exec(), but without supplying a callout function, matching went wrong.
1512    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
1513        leak if the size of the offset vector was greater than 30. When the vector
1514        is smaller, the saved offsets during recursion go onto a local stack
1515        vector, but for larger vectors malloc() is used. It was failing to free
1516        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
1517        error, in fact).
1519    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
1520        heapframe that is used only when UTF-8 support is enabled. This caused no
1521        problem, but was untidy.
1523    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
1524        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
1525        included within another project.
1527    24. Steven Van Ingelgem's patches to add more options to the CMake support,
1528        slightly modified by me:
1530          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
1531              not building pcregrep.
1533          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
1534              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
1536    25. Forward references, both numeric and by name, in patterns that made use of
1537        duplicate group numbers, could behave incorrectly or give incorrect errors,
1538        because when scanning forward to find the reference group, PCRE was not
1539        taking into account the duplicate group numbers. A pattern such as
1540        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
1542    26. Changed a few more instances of "const unsigned char *" to USPTR, making
1543        the feature of a custom pointer more persuasive (as requested by a user).
1545    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
1546        pcretest.c, inside #ifndefs, because it seems they are sometimes already
1547        pre-defined.
1549    28. Added support for (*UTF8) at the start of a pattern.
1551    29. Arrange for flags added by the "release type" setting in CMake to be shown
1552        in the configuration summary.
1555    Version 7.8 05-Sep-08
1556    ---------------------
1558    1.  Replaced UCP searching code with optimized version as implemented for Ad
1559        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
1560        stage table and inline lookup instead of a function, giving speed ups of 2
1561        to 5 times on some simple patterns that I tested. Permission was given to
1562        distribute the MultiStage2.py script that generates the tables (it's not in
1563        the tarball, but is in the Subversion repository).
1565    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
1566        scripts.
1568    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
1569        a group with a zero qualifier. The result of the study could be incorrect,
1570        or the function might crash, depending on the pattern.
1572    4.  Caseless matching was not working for non-ASCII characters in back
1573        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
1574        It now works when Unicode Property Support is available.
1576    5.  In pcretest, an escape such as \x{de} in the data was always generating
1577        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
1578        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
1579        truncation.
1581    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
1583    7.  Added two (int) casts to pcregrep when printing the difference of two
1584        pointers, in case they are 64-bit values.
1586    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
1587        test 2 if it fails.
1589    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
1590        and a #define of that name to empty if it is not externally set. This is to
1591        allow users of MSVC to set it if necessary.
1593    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
1594        the convenience functions in the pcre_get.c source file.
1596    11. An option change at the start of a pattern that had top-level alternatives
1597        could cause overwriting and/or a crash. This command provoked a crash in
1598        some environments:
1600          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
1602        This potential security problem was recorded as CVE-2008-2371.
1604    12. For a pattern where the match had to start at the beginning or immediately
1605        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
1606        pcre_dfa_exec() could read past the end of the passed subject if there was
1607        no match. To help with detecting such bugs (e.g. with valgrind), I modified
1608        pcretest so that it places the subject at the end of its malloc-ed buffer.
1610    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
1611        exec() might read past the end of the data buffer in UTF-8 mode.
1613    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
1614        the data contained the byte 0x85 as part of a UTF-8 character within its
1615        first line. This applied both to normal and DFA matching.
1617    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
1618        /^[^d]*?$/8 failed to match "abc".
1620    16. Added a missing copyright notice to pcrecpp_internal.h.
1622    17. Make it more clear in the documentation that values returned from
1623        pcre_exec() in ovector are byte offsets, not character counts.
1625    18. Tidied a few places to stop certain compilers from issuing warnings.
1627    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
1628        supplied by Stefan Weber. I made a further small update for 7.8 because
1629        there is a change of source arrangements: the pcre_searchfuncs.c module is
1630        replaced by pcre_ucd.c.
1633    Version 7.7 07-May-08
1634    ---------------------
1636    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
1637        a string to a long long, pretend we don't even have a long long." This is
1638        done by checking for the strtoq, strtoll, and _strtoi64 functions.
1640    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
1641        pre-7.6 versions, which defined a global no_arg variable instead of putting
1642        it in the RE class. (See also #8 below.)
1644    3.  Remove a line of dead code, identified by coverity and reported by Nuno
1645        Lopes.
1647    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
1649        (1) The include/exclude patterns were being applied to the whole pathnames
1650            of files, instead of just to the final components.
1652        (2) If there was more than one level of directory, the subdirectories were
1653            skipped unless they satisfied the include/exclude conditions. This is
1654            inconsistent with GNU grep (and could even be seen as contrary to the
1655            pcregrep specification - which I improved to make it absolutely clear).
1656            The action now is always to scan all levels of directory, and just
1657            apply the include/exclude patterns to regular files.
1659    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
1660        --exclude_dir in the tests to avoid scanning .svn directories.
1662    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
1663        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
1664        doesn't support NULs in patterns.
1666    7.  Added some missing "const"s to declarations of static tables in
1667        pcre_compile.c and pcre_dfa_exec.c.
1669    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
1670        caused by fix #2  above. (Subsequently also a second patch to fix the
1671        first patch. And a third patch - this was a messy problem.)
1673    9.  Applied Craig's patch to remove the use of push_back().
1675    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
1676        matching function regexec().
1678    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
1679        which, however, unlike Perl's \g{...}, are subroutine calls, not back
1680        references. PCRE supports relative numbers with this syntax (I don't think
1681        Oniguruma does).
1683    12. Previously, a group with a zero repeat such as (...){0} was completely
1684        omitted from the compiled regex. However, this means that if the group
1685        was called as a subroutine from elsewhere in the pattern, things went wrong
1686        (an internal error was given). Such groups are now left in the compiled
1687        pattern, with a new opcode that causes them to be skipped at execution
1688        time.
1690    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
1691        to the way PCRE behaves:
1693        (a) A lone ] character is dis-allowed (Perl treats it as data).
1695        (b) A back reference to an unmatched subpattern matches an empty string
1696            (Perl fails the current match path).
1698        (c) A data ] in a character class must be notated as \] because if the
1699            first data character in a class is ], it defines an empty class. (In
1700            Perl it is not possible to have an empty class.) The empty class []
1701            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
1702            The negative empty class [^] matches any one character, independently
1703            of the DOTALL setting.
1705    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
1706        non-existent subpattern following a character class starting with ']' and
1707        containing () gave an internal compiling error instead of "reference to
1708        non-existent subpattern". Fortunately, when the pattern did exist, the
1709        compiled code was correct. (When scanning forwards to check for the
1710        existencd of the subpattern, it was treating the data ']' as terminating
1711        the class, so got the count wrong. When actually compiling, the reference
1712        was subsequently set up correctly.)
1714    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
1715        it was being rejected as not supported by pcre_dfa_exec(), even though
1716        other assertions are supported. I have made pcre_dfa_exec() support
1717        (*FAIL).
1719    16. The implementation of 13c above involved the invention of a new opcode,
1720        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
1721        cannot be changed at match time, I realized I could make a small
1722        improvement to matching performance by compiling OP_ALLANY instead of
1723        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
1724        on the OP_ANY path.
1726    17. Compiling pcretest on Windows with readline support failed without the
1727        following two fixes: (1) Make the unistd.h include conditional on
1728        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
1730    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
1731        ncurses library to be included for pcretest when ReadLine support is
1732        requested, but also to allow for it to be overridden. This patch came from
1733        Daniel Bergström.
1735    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
1736        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
1737        any errors with the current Unicode tables. Thanks to Peter Kankowski for
1738        spotting this.
1741    Version 7.6 28-Jan-08
1742  ---------------------  ---------------------
1744  1.  A character class containing a very large number of characters with  1.  A character class containing a very large number of characters with
1745      codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer      codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
1746      overflow.      overflow.
1748  2.  Patch to cut out the "long long" test in pcrecpp_unittest when  2.  Patch to cut out the "long long" test in pcrecpp_unittest when
1749      HAVE_LONG_LONG is not defined.      HAVE_LONG_LONG is not defined.
1751  3.  Applied Christian Ehrlicher's patch to update the CMake build files to  3.  Applied Christian Ehrlicher's patch to update the CMake build files to
1752      bring them up to date and include new features.      bring them up to date and include new features. This patch includes:
1754        - Fixed PH's badly added libz and libbz2 support.
1755        - Fixed a problem with static linking.
1756        - Added pcredemo. [But later removed - see 7 below.]
1757        - Fixed dftables problem and added an option.
1758        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
1759            HAVE_LONG_LONG.
1760        - Added readline support for pcretest.
1761        - Added an listing of the option settings after cmake has run.
1763    4.  A user submitted a patch to Makefile that makes it easy to create
1764        "pcre.dll" under mingw when using Configure/Make. I added stuff to
1765        Makefile.am that cause it to include this special target, without
1766        affecting anything else. Note that the same mingw target plus all
1767        the other distribution libraries and programs are now supported
1768        when configuring with CMake (see 6 below) instead of with
1769        Configure/Make.
1771    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
1772        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
1773        exported in the Windows port". It has not yet been confirmed that the patch
1774        solves the problem, but it does no harm.
1776    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
1777        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
1778        with CMake, and also correct the comment about stack recursion.
1780    7.  Remove the automatic building of pcredemo from the ./configure system and
1781        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
1782        of a program that users should build themselves after PCRE is installed, so
1783        building it automatically is not really right. What is more, it gave
1784        trouble in some build environments.
1786    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
1789  Version 7.5 10-Jan-08  Version 7.5 10-Jan-08
1790  ---------------------  ---------------------

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