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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 7.7 05-Mar-08  Version 8.33 xx-xxxx-201x
5    -------------------------
7    1.  Added 'U' to some constants that are compared to unsigned integers, to
8        avoid compiler signed/unsigned warnings. Added (int) casts to unsigned
9        variables that are added to signed variables, to ensure the result is
10        signed and can be negated.
12    2.  Applied patch by Daniel Richard G for quashing MSVC warnings to the
13        CMake config files.
15    3.  Revise the creation of config.h.generic so that all boolean macros are
16        #undefined, whereas non-boolean macros are #ifndef/#endif-ed. This makes
17        overriding via -D on the command line possible.
19    4.  Changing the definition of the variable "op" in pcre_exec.c from pcre_uchar
20        to unsigned int is reported to make a quite noticeable speed difference in
21        a specific Windows environment. Testing on Linux did also appear to show
22        some benefit (and it is clearly not harmful). Also fixed the definition of
23        Xop which should be unsigned.
25    5.  Related to (4), changing the definition of the intermediate variable cc
26        in repeated character loops from pcre_uchar to pcre_uint32 also gave speed
27        improvements.
29    6.  Fix forward search in JIT when link size is 3 or greater. Also removed some
30        unnecessary spaces.
32    7.  Adjust autogen.sh and configure.ac to lose warnings given by automake 1.12
33        and later.
35    8.  Fix two buffer over read issues in 16 and 32 bit modes. Affects JIT only.
37    9.  Optimizing fast_forward_start_bits in JIT.
39    10. Adding experimental support for callouts in JIT, and fixing some
40        issues revealed during this work. Namely:
42        (a) Unoptimized capturing brackets incorrectly reset on backtrack.
44        (b) Minimum length was not checked before the matching is started.
46    11. The value of capture_last that is passed to callouts was incorrect in some
47        cases when there was a capture on one path that was subsequently abandoned
48        after a backtrack. Also, the capture_last value is now reset after a
49        recursion, since all captures are also reset in this case.
51    12. The interpreter no longer returns the "too many substrings" error in the
52        case when an overflowing capture is in a branch that is subsequently
53        abandoned after a backtrack.
55    13. In the pathological case when an offset vector of size 2 is used, pcretest
56        now prints out the matched string after a yield of 0 or 1.
58    14. Inlining subpatterns in recursions, when certain conditions are fulfilled.
59        Only supported by the JIT compiler at the moment.
62    Version 8.32 30-November-2012
63    -----------------------------
65    1.  Improved JIT compiler optimizations for first character search and single
66        character iterators.
68    2.  Supporting IBM XL C compilers for PPC architectures in the JIT compiler.
69        Patch by Daniel Richard G.
71    3.  Single character iterator optimizations in the JIT compiler.
73    4.  Improved JIT compiler optimizations for character ranges.
75    5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
76        Reported by Giuseppe D'Angelo.
78    6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
79        of a line, was being set incorrectly in cases where .* appeared inside
80        atomic brackets at the start of a pattern, or where there was a subsequent
81        *PRUNE or *SKIP.
83    7.  Improved instruction cache flush for POWER/PowerPC.
84        Patch by Daniel Richard G.
86    8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
87        grep:
89        (a) There is now no limit to the number of patterns to be matched.
91        (b) An error is given if a pattern is too long.
93        (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
94            are now supported.
96        (d) --exclude-from and --include-from (multiple use) have been added.
98        (e) Exclusions and inclusions now apply to all files and directories, not
99            just to those obtained from scanning a directory recursively.
101        (f) Multiple uses of -f and --file-list are now supported.
103        (g) In a Windows environment, the default for -d has been changed from
104            "read" (the GNU grep default) to "skip", because otherwise the presence
105            of a directory in the file list provokes an error.
107        (h) The documentation has been revised and clarified in places.
109    9.  Improve the matching speed of capturing brackets.
111    10. Changed the meaning of \X so that it now matches a Unicode extended
112        grapheme cluster.
114    11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
115        out POSIX threads when JIT support is configured.
117    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
119    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
120        structure could go wrong in environments where size_t is not the same size
121        as int.
123    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
124        set.
126    15. The EBCDIC support had decayed; later updates to the code had included
127        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
128        general tidy up of EBCDIC-related issues, and the documentation was also
129        not quite right. There is now a test that can be run on ASCII systems to
130        check some of the EBCDIC-related things (but is it not a full test).
132    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
133        in a small tidy to the code.
135    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
137    18. If the --only-matching (-o) option in pcregrep is specified multiple
138        times, each one causes appropriate output. For example, -o1 -o2 outputs the
139        substrings matched by the 1st and 2nd capturing parentheses. A separating
140        string can be specified by --om-separator (default empty).
142    19. Improving the first n character searches.
144    20. Turn case lists for horizontal and vertical white space into macros so that
145        they are defined only once.
147    21. This set of changes together give more compatible Unicode case-folding
148        behaviour for characters that have more than one other case when UCP
149        support is available.
151        (a) The Unicode property table now has offsets into a new table of sets of
152            three or more characters that are case-equivalent. The MultiStage2.py
153            script that generates these tables (the pcre_ucd.c file) now scans
154            CaseFolding.txt instead of UnicodeData.txt for character case
155            information.
157        (b) The code for adding characters or ranges of characters to a character
158            class has been abstracted into a generalized function that also handles
159            case-independence. In UTF-mode with UCP support, this uses the new data
160            to handle characters with more than one other case.
162        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
163            whose other case is greater than 256 are now correctly matched
164            caselessly. Previously, the high codepoint matched the low one, but not
165            vice versa.
167        (d) The processing of \h, \H, \v, and \ in character classes now makes use
168            of the new class addition function, using character lists defined as
169            macros alongside the case definitions of 20 above.
171        (e) Caseless back references now work with characters that have more than
172            one other case.
174        (f) General caseless matching of characters with more than one other case
175            is supported.
177    22. Unicode character properties were updated from Unicode 6.2.0
179    23. Improved CMake support under Windows. Patch by Daniel Richard G.
181    24. Add support for 32-bit character strings, and UTF-32
183    25. Major JIT compiler update (code refactoring and bugfixing).
184        Experimental Sparc 32 support is added.
186    26. Applied a modified version of Daniel Richard G's patch to create
187        pcre.h.generic and config.h.generic by "make" instead of in the
188        PrepareRelease script.
190    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
191        pcre_compile.c when checking for a zero character.
193    28. Introducing a native interface for JIT. Through this interface, the compiled
194        machine code can be directly executed. The purpose of this interface is to
195        provide fast pattern matching, so several sanity checks are not performed.
196        However, feature tests are still performed. The new interface provides
197        1.4x speedup compared to the old one.
199    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
200        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
201        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
203    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
204        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
205        the "old" RFC 2279). Instead, it ended up passing a negative length to
206        pcre_exec().
208    31. Add support for GCC's visibility feature to hide internal functions.
210    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
211        "unknown -C option" after outputting 0 or 1.
213    33. There is now support for generating a code coverage report for the test
214        suite in environments where gcc is the compiler and lcov is installed. This
215        is mainly for the benefit of the developers.
217    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
218        unaddressable using valgrind annotations, allowing valgrind to detect
219        invalid memory accesses. This is mainly for the benefit of the developers.
221    25. (*UTF) can now be used to start a pattern in any of the three libraries.
223    26. Give configure error if --enable-cpp but no C++ compiler found.
226    Version 8.31 06-July-2012
227    -------------------------
229    1.  Fixing a wrong JIT test case and some compiler warnings.
231    2.  Removed a bashism from the RunTest script.
233    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
234        to unsigned type, result still unsigned" that was given by an MS compiler
235        on encountering the code "-sizeof(xxx)".
237    4.  Partial matching support is added to the JIT compiler.
239    5.  Fixed several bugs concerned with partial matching of items that consist
240        of more than one character:
242        (a) /^(..)\1/ did not partially match "aba" because checking references was
243            done on an "all or nothing" basis. This also applied to repeated
244            references.
246        (b) \R did not give a hard partial match if \r was found at the end of the
247            subject.
249        (c) \X did not give a hard partial match after matching one or more
250            characters at the end of the subject.
252        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
253            a partial match for the string "\r".
255        (e) When newline was set to CRLF, the metacharacter "." did not recognize
256            a partial match for a CR character at the end of the subject string.
258    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
259        running pcretest, the text "(JIT)" added to the output whenever JIT is
260        actually used to run the match.
262    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
263        or /S+[+] with a digit between 1 and 7.
265    8.  OP_NOT now supports any UTF character not just single-byte ones.
267    9.  (*MARK) control verb is now supported by the JIT compiler.
269    10. The command "./RunTest list" lists the available tests without actually
270        running any of them. (Because I keep forgetting what they all are.)
274    12. Applied a (slightly modified) user-supplied patch that improves performance
275        when the heap is used for recursion (compiled with --disable-stack-for-
276        recursion). Instead of malloc and free for each heap frame each time a
277        logical recursion happens, frames are retained on a chain and re-used where
278        possible. This sometimes gives as much as 30% improvement.
280    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
281        call.
283    14. As documented, (*COMMIT) is now confined to within a positive assertion.
285    15. It is now possible to link pcretest with libedit as an alternative to
286        libreadline.
288    16. (*COMMIT) control verb is now supported by the JIT compiler.
290    17. The Unicode data tables have been updated to Unicode 6.1.0.
292    18. Added --file-list option to pcregrep.
294    19. Added binary file support to pcregrep, including the -a, --binary-files,
295        -I, and --text options.
297    20. The madvise function is renamed for posix_madvise for QNX compatibility
298        reasons. Fixed by Giuseppe D'Angelo.
300    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
302    22. Changed the option for creating symbolic links for 16-bit man pages from
303        -s to -sf so that re-installing does not cause issues.
305    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
307    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
308        matches in certain environments (the workspace was not being correctly
309        retained). Also added to pcre_dfa_exec() a simple plausibility check on
310        some of the workspace data at the beginning of a restart.
312    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
313        was not doing so when it should - probably a typo introduced by SVN 528
314        (change 8.10/14).
316    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
317        \w+ when the character tables indicated that \x{c4} was a word character.
318        There were several related cases, all because the tests for doing a table
319        lookup were testing for characters less than 127 instead of 255.
321    27. If a pattern contains capturing parentheses that are not used in a match,
322        their slots in the ovector are set to -1. For those that are higher than
323        any matched groups, this happens at the end of processing. In the case when
324        there were back references that the ovector was too small to contain
325        (causing temporary malloc'd memory to be used during matching), and the
326        highest capturing number was not used, memory off the end of the ovector
327        was incorrectly being set to -1. (It was using the size of the temporary
328        memory instead of the true size.)
330    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
331        ovector size, it uses memory at the end of the block that it has got.
333    29. Check for an overlong MARK name and give an error at compile time. The
334        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
336    30. JIT compiler update.
338    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
339        Rill for the patch.
341    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
343    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
345    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
346        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
347        was enabled.
349    35. Improve JIT code generation for greedy plus quantifier.
351    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
352        1 to "aa" instead of to an empty string. The bug affected repeated groups
353        that could potentially match an empty string.
355    37. Optimizing single character iterators in JIT.
357    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
358        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
359        codepoints that are too big for the mode are faulted, and in a UTF mode,
360        disallowed codepoints are also faulted.
362    39. If PCRE was compiled with UTF support, in three places in the DFA
363        matcher there was code that should only have been obeyed in UTF mode, but
364        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
365        processing when bytes with values greater than 127 were present. In 16-bit
366        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
367        both cases the values are those that cannot be the first data item in a UTF
368        character. The three items that might have provoked this were recursions,
369        possessively repeated groups, and atomic groups.
371    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
372        and pcregrep, because some OS require shared objects to be explicitly
373        passed to ld, causing the link step to fail if they are not.
375    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
376        mode, patterns that started with \h* or \R* might be incorrectly matched.
379    Version 8.30 04-February-2012
380    -----------------------------
382    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
383        name is defined in ctype.h.
385    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
386        only in quite long subpatterns.
388    3.  Removed the function pcre_info(), which has been obsolete and deprecated
389        since it was replaced by pcre_fullinfo() in February 2000.
391    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
392        match a (*MARK), and the match failed at the start of the subject, a
393        reference to memory before the start of the subject could occur. This bug
394        was introduced by fix 17 of release 8.21.
396    5.  A reference to an unset group with zero minimum repetition was giving
397        totally wrong answers (in non-JavaScript-compatibility mode). For example,
398        /(another)?(\1?)test/ matched against "hello world test". This bug was
399        introduced in release 8.13.
401    6.  Add support for 16-bit character strings (a large amount of work involving
402        many changes and refactorings).
404    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
405        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
406        from a file.
408    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
409        rounding is not applied in this particular case).
411    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
412        if they appear, or are escaped, in patterns.
414    10. Get rid of a number of -Wunused-but-set-variable warnings.
416    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
417        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
418        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
419        also returns the mark "x". This bug applied to capturing parentheses,
420        non-capturing parentheses, and atomic parentheses. It also applied to some
421        assertions.
423    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
424        information out of configure.ac instead of relying on pcre.h.generic, which
425        is not stored in the repository.
427    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
428        -lreadline.
430    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
432    15. Applied Graycode's patch to put the top-level frame on the stack rather
433        than the heap when not using the stack for recursion. This gives a
434        performance improvement in many cases when recursion is not deep.
436    16. Experimental code added to "pcretest -C" to output the stack frame size.
439    Version 8.21 12-Dec-2011
440    ------------------------
442    1.  Updating the JIT compiler.
444    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
445        are added as well.
447    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
448        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
449        calling _pcre_jit_exec. Some extra comments are added.
451    4.  (*MARK) settings inside atomic groups that do not contain any capturing
452        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
453        was introduced by change 18 for 8.20.
455    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
456        ECMA-262 standard.
458    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
459        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
460        This bug was probably introduced by change 9 of 8.13.
462    7.  While fixing 6 above, I noticed that a number of other items were being
463        incorrectly rejected as "not fixed length". This arose partly because newer
464        opcodes had not been added to the fixed-length checking code. I have (a)
465        corrected the bug and added tests for these items, and (b) arranged for an
466        error to occur if an unknown opcode is encountered while checking for fixed
467        length instead of just assuming "not fixed length". The items that were
468        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
469        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
470        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
472    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
473        being incorrectly compiled and would have given unpredicatble results.
475    9.  A possessively repeated subpattern with minimum repeat count greater than
476        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
477        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
478        the first (A) could occur when it should not.
480    10. Add a cast and remove a redundant test from the code.
482    11. JIT should use pcre_malloc/pcre_free for allocation.
484    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
485        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
486        is anything other than /usr, -L is still shown).
488    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
490    14. Perl does not support \N without a following name in a [] class; PCRE now
491        also gives an error.
493    15. If a forward reference was repeated with an upper limit of around 2000,
494        it caused the error "internal error: overran compiling workspace". The
495        maximum number of forward references (including repeats) was limited by the
496        internal workspace, and dependent on the LINK_SIZE. The code has been
497        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
498        the default depends on LINK_SIZE. There is a new upper limit (for safety)
499        of around 200,000 forward references. While doing this, I also speeded up
500        the filling in of repeated forward references.
502    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
503        incorrectly expecting the subject to contain another "a" after the start.
505    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
506        in the match, the SKIP should be ignored. This was not happening; instead
507        the SKIP was being treated as NOMATCH. For patterns such as
508        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
509        tested.
511    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
512        now much more compatible with Perl, in particular in cases where the result
513        is a non-match for a non-anchored pattern. For example, if
514        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
515        "m", where previously it did not return a name. A side effect of this
516        change is that for partial matches, the last encountered mark name is
517        returned, as for non matches. A number of tests that were previously not
518        Perl-compatible have been moved into the Perl-compatible test files. The
519        refactoring has had the pleasing side effect of removing one argument from
520        the match() function, thus reducing its stack requirements.
522    19. If the /S+ option was used in pcretest to study a pattern using JIT,
523        subsequent uses of /S (without +) incorrectly behaved like /S+.
525    21. Retrieve executable code size support for the JIT compiler and fixing
526        some warnings.
528    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
529        not work when the shorter character appeared right at the end of the
530        subject string.
532    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
533        systems.
535    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
536        output it when the /M option is used in pcretest.
538    25. The CheckMan script was not being included in the distribution. Also, added
539        an explicit "perl" to run Perl scripts from the PrepareRelease script
540        because this is reportedly needed in Windows.
542    26. If study data was being save in a file and studying had not found a set of
543        "starts with" bytes for the pattern, the data written to the file (though
544        never used) was taken from uninitialized memory and so caused valgrind to
545        complain.
547    27. Updated RunTest.bat as provided by Sheri Pierce.
549    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
551    29. Computation of memory usage for the table of capturing group names was
552        giving an unnecessarily large value.
555    Version 8.20 21-Oct-2011
556    ------------------------
558    1.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had
559        a POSIX class. After further experiments with Perl, which convinced me that
560        Perl has bugs and confusions, a closing square bracket is no longer allowed
561        in a POSIX name. This bug also affected patterns with classes that started
562        with full stops.
564    2.  If a pattern such as /(a)b|ac/ is matched against "ac", there is no
565        captured substring, but while checking the failing first alternative,
566        substring 1 is temporarily captured. If the output vector supplied to
567        pcre_exec() was not big enough for this capture, the yield of the function
568        was still zero ("insufficient space for captured substrings"). This cannot
569        be totally fixed without adding another stack variable, which seems a lot
570        of expense for a edge case. However, I have improved the situation in cases
571        such as /(a)(b)x|abc/ matched against "abc", where the return code
572        indicates that fewer than the maximum number of slots in the ovector have
573        been set.
575    3.  Related to (2) above: when there are more back references in a pattern than
576        slots in the output vector, pcre_exec() uses temporary memory during
577        matching, and copies in the captures as far as possible afterwards. It was
578        using the entire output vector, but this conflicts with the specification
579        that only 2/3 is used for passing back captured substrings. Now it uses
580        only the first 2/3, for compatibility. This is, of course, another edge
581        case.
583    4.  Zoltan Herczeg's just-in-time compiler support has been integrated into the
584        main code base, and can be used by building with --enable-jit. When this is
585        done, pcregrep automatically uses it unless --disable-pcregrep-jit or the
586        runtime --no-jit option is given.
588    5.  When the number of matches in a pcre_dfa_exec() run exactly filled the
589        ovector, the return from the function was zero, implying that there were
590        other matches that did not fit. The correct "exactly full" value is now
591        returned.
593    6.  If a subpattern that was called recursively or as a subroutine contained
594        (*PRUNE) or any other control that caused it to give a non-standard return,
595        invalid errors such as "Error -26 (nested recursion at the same subject
596        position)" or even infinite loops could occur.
598    7.  If a pattern such as /a(*SKIP)c|b(*ACCEPT)|/ was studied, it stopped
599        computing the minimum length on reaching *ACCEPT, and so ended up with the
600        wrong value of 1 rather than 0. Further investigation indicates that
601        computing a minimum subject length in the presence of *ACCEPT is difficult
602        (think back references, subroutine calls), and so I have changed the code
603        so that no minimum is registered for a pattern that contains *ACCEPT.
605    8.  If (*THEN) was present in the first (true) branch of a conditional group,
606        it was not handled as intended. [But see 16 below.]
608    9.  Replaced RunTest.bat and CMakeLists.txt with improved versions provided by
609        Sheri Pierce.
611    10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that
612        the first byte in a match must be "a".
614    11. Change 17 for 8.13 increased the recursion depth for patterns like
615        /a(?:.)*?a/ drastically. I've improved things by remembering whether a
616        pattern contains any instances of (*THEN). If it does not, the old
617        optimizations are restored. It would be nice to do this on a per-group
618        basis, but at the moment that is not feasible.
620    12. In some environments, the output of pcretest -C is CRLF terminated. This
621        broke RunTest's code that checks for the link size. A single white space
622        character after the value is now allowed for.
624    13. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".
625        For "fr", it uses the Windows-specific input and output files.
627    14. If (*THEN) appeared in a group that was called recursively or as a
628        subroutine, it did not work as intended. [But see next item.]
630    15. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex
631        pattern fragments (but not containing any | characters). If A and B are
632        matched, but there is a failure in C so that it backtracks to (*THEN), PCRE
633        was behaving differently to Perl. PCRE backtracked into A, but Perl goes to
634        D. In other words, Perl considers parentheses that do not contain any |
635        characters to be part of a surrounding alternative, whereas PCRE was
636        treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles
637        differently. PCRE now behaves in the same way as Perl, except in the case
638        of subroutine/recursion calls such as (?1) which have in any case always
639        been different (but PCRE had them first :-).
641    16. Related to 15 above: Perl does not treat the | in a conditional group as
642        creating alternatives. Such a group is treated in the same way as an
643        ordinary group without any | characters when processing (*THEN). PCRE has
644        been changed to match Perl's behaviour.
646    17. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the
647        RunGrepTest script failed.
649    18. Change 22 for version 13 caused atomic groups to use more stack. This is
650        inevitable for groups that contain captures, but it can lead to a lot of
651        stack use in large patterns. The old behaviour has been restored for atomic
652        groups that do not contain any capturing parentheses.
654    19. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not
655        suppress the check for a minimum subject length at run time. (If it was
656        given to pcre_exec() or pcre_dfa_exec() it did work.)
658    20. Fixed an ASCII-dependent infelicity in pcretest that would have made it
659        fail to work when decoding hex characters in data strings in EBCDIC
660        environments.
662    21. It appears that in at least one Mac OS environment, the isxdigit() function
663        is implemented as a macro that evaluates to its argument more than once,
664        contravening the C 90 Standard (I haven't checked a later standard). There
665        was an instance in pcretest which caused it to go wrong when processing
666        \x{...} escapes in subject strings. The has been rewritten to avoid using
667        things like p++ in the argument of isxdigit().
670    Version 8.13 16-Aug-2011
671    ------------------------
673    1.  The Unicode data tables have been updated to Unicode 6.0.0.
675    2.  Two minor typos in pcre_internal.h have been fixed.
677    3.  Added #include <string.h> to pcre_scanner_unittest.cc, pcrecpp.cc, and
678        pcrecpp_unittest.cc. They are needed for strcmp(), memset(), and strchr()
679        in some environments (e.g. Solaris 10/SPARC using Sun Studio 12U2).
681    4.  There were a number of related bugs in the code for matching backrefences
682        caselessly in UTF-8 mode when codes for the characters concerned were
683        different numbers of bytes. For example, U+023A and U+2C65 are an upper
684        and lower case pair, using 2 and 3 bytes, respectively. The main bugs were:
685        (a) A reference to 3 copies of a 2-byte code matched only 2 of a 3-byte
686        code. (b) A reference to 2 copies of a 3-byte code would not match 2 of a
687        2-byte code at the end of the subject (it thought there wasn't enough data
688        left).
690    5.  Comprehensive information about what went wrong is now returned by
691        pcre_exec() and pcre_dfa_exec() when the UTF-8 string check fails, as long
692        as the output vector has at least 2 elements. The offset of the start of
693        the failing character and a reason code are placed in the vector.
695    6.  When the UTF-8 string check fails for pcre_compile(), the offset that is
696        now returned is for the first byte of the failing character, instead of the
697        last byte inspected. This is an incompatible change, but I hope it is small
698        enough not to be a problem. It makes the returned offset consistent with
699        pcre_exec() and pcre_dfa_exec().
701    7.  pcretest now gives a text phrase as well as the error number when
702        pcre_exec() or pcre_dfa_exec() fails; if the error is a UTF-8 check
703        failure, the offset and reason code are output.
705    8.  When \R was used with a maximizing quantifier it failed to skip backwards
706        over a \r\n pair if the subsequent match failed. Instead, it just skipped
707        back over a single character (\n). This seems wrong (because it treated the
708        two characters as a single entity when going forwards), conflicts with the
709        documentation that \R is equivalent to (?>\r\n|\n|...etc), and makes the
710        behaviour of \R* different to (\R)*, which also seems wrong. The behaviour
711        has been changed.
713    9.  Some internal refactoring has changed the processing so that the handling
714        of the PCRE_CASELESS and PCRE_MULTILINE options is done entirely at compile
715        time (the PCRE_DOTALL option was changed this way some time ago: version
716        7.7 change 16). This has made it possible to abolish the OP_OPT op code,
717        which was always a bit of a fudge. It also means that there is one less
718        argument for the match() function, which reduces its stack requirements
719        slightly. This change also fixes an incompatibility with Perl: the pattern
720        (?i:([^b]))(?1) should not match "ab", but previously PCRE gave a match.
722    10. More internal refactoring has drastically reduced the number of recursive
723        calls to match() for possessively repeated groups such as (abc)++ when
724        using pcre_exec().
726    11. While implementing 10, a number of bugs in the handling of groups were
727        discovered and fixed:
729        (?<=(a)+) was not diagnosed as invalid (non-fixed-length lookbehind).
730        (a|)*(?1) gave a compile-time internal error.
731        ((a|)+)+  did not notice that the outer group could match an empty string.
732        (^a|^)+   was not marked as anchored.
733        (.*a|.*)+ was not marked as matching at start or after a newline.
735    12. Yet more internal refactoring has removed another argument from the match()
736        function. Special calls to this function are now indicated by setting a
737        value in a variable in the "match data" data block.
739    13. Be more explicit in pcre_study() instead of relying on "default" for
740        opcodes that mean there is no starting character; this means that when new
741        ones are added and accidentally left out of pcre_study(), testing should
742        pick them up.
744    14. The -s option of pcretest has been documented for ages as being an old
745        synonym of -m (show memory usage). I have changed it to mean "force study
746        for every regex", that is, assume /S for every regex. This is similar to -i
747        and -d etc. It's slightly incompatible, but I'm hoping nobody is still
748        using it. It makes it easier to run collections of tests with and without
749        study enabled, and thereby test pcre_study() more easily. All the standard
750        tests are now run with and without -s (but some patterns can be marked as
751        "never study" - see 20 below).
753    15. When (*ACCEPT) was used in a subpattern that was called recursively, the
754        restoration of the capturing data to the outer values was not happening
755        correctly.
757    16. If a recursively called subpattern ended with (*ACCEPT) and matched an
758        empty string, and PCRE_NOTEMPTY was set, pcre_exec() thought the whole
759        pattern had matched an empty string, and so incorrectly returned a no
760        match.
762    17. There was optimizing code for the last branch of non-capturing parentheses,
763        and also for the obeyed branch of a conditional subexpression, which used
764        tail recursion to cut down on stack usage. Unfortunately, now that there is
765        the possibility of (*THEN) occurring in these branches, tail recursion is
766        no longer possible because the return has to be checked for (*THEN). These
767        two optimizations have therefore been removed. [But see 8.20/11 above.]
769    18. If a pattern containing \R was studied, it was assumed that \R always
770        matched two bytes, thus causing the minimum subject length to be
771        incorrectly computed because \R can also match just one byte.
773    19. If a pattern containing (*ACCEPT) was studied, the minimum subject length
774        was incorrectly computed.
776    20. If /S is present twice on a test pattern in pcretest input, it now
777        *disables* studying, thereby overriding the use of -s on the command line
778        (see 14 above). This is necessary for one or two tests to keep the output
779        identical in both cases.
781    21. When (*ACCEPT) was used in an assertion that matched an empty string and
782        PCRE_NOTEMPTY was set, PCRE applied the non-empty test to the assertion.
784    22. When an atomic group that contained a capturing parenthesis was
785        successfully matched, but the branch in which it appeared failed, the
786        capturing was not being forgotten if a higher numbered group was later
787        captured. For example, /(?>(a))b|(a)c/ when matching "ac" set capturing
788        group 1 to "a", when in fact it should be unset. This applied to multi-
789        branched capturing and non-capturing groups, repeated or not, and also to
790        positive assertions (capturing in negative assertions does not happen
791        in PCRE) and also to nested atomic groups.
793    23. Add the ++ qualifier feature to pcretest, to show the remainder of the
794        subject after a captured substring, to make it easier to tell which of a
795        number of identical substrings has been captured.
797    24. The way atomic groups are processed by pcre_exec() has been changed so that
798        if they are repeated, backtracking one repetition now resets captured
799        values correctly. For example, if ((?>(a+)b)+aabab) is matched against
800        "aaaabaaabaabab" the value of captured group 2 is now correctly recorded as
801        "aaa". Previously, it would have been "a". As part of this code
802        refactoring, the way recursive calls are handled has also been changed.
804    25. If an assertion condition captured any substrings, they were not passed
805        back unless some other capturing happened later. For example, if
806        (?(?=(a))a) was matched against "a", no capturing was returned.
808    26. When studying a pattern that contained subroutine calls or assertions,
809        the code for finding the minimum length of a possible match was handling
810        direct recursions such as (xxx(?1)|yyy) but not mutual recursions (where
811        group 1 called group 2 while simultaneously a separate group 2 called group
812        1). A stack overflow occurred in this case. I have fixed this by limiting
813        the recursion depth to 10.
815    27. Updated RunTest.bat in the distribution to the version supplied by Tom
816        Fortmann. This supports explicit test numbers on the command line, and has
817        argument validation and error reporting.
819    28. An instance of \X with an unlimited repeat could fail if at any point the
820        first character it looked at was a mark character.
822    29. Some minor code refactoring concerning Unicode properties and scripts
823        should reduce the stack requirement of match() slightly.
825    30. Added the '=' option to pcretest to check the setting of unused capturing
826        slots at the end of the pattern, which are documented as being -1, but are
827        not included in the return count.
829    31. If \k was not followed by a braced, angle-bracketed, or quoted name, PCRE
830        compiled something random. Now it gives a compile-time error (as does
831        Perl).
833    32. A *MARK encountered during the processing of a positive assertion is now
834        recorded and passed back (compatible with Perl).
836    33. If --only-matching or --colour was set on a pcregrep call whose pattern
837        had alternative anchored branches, the search for a second match in a line
838        was done as if at the line start. Thus, for example, /^01|^02/ incorrectly
839        matched the line "0102" twice. The same bug affected patterns that started
840        with a backwards assertion. For example /\b01|\b02/ also matched "0102"
841        twice.
843    34. Previously, PCRE did not allow quantification of assertions. However, Perl
844        does, and because of capturing effects, quantifying parenthesized
845        assertions may at times be useful. Quantifiers are now allowed for
846        parenthesized assertions.
848    35. A minor code tidy in pcre_compile() when checking options for \R usage.
850    36. \g was being checked for fancy things in a character class, when it should
851        just be a literal "g".
853    37. PCRE was rejecting [:a[:digit:]] whereas Perl was not. It seems that the
854        appearance of a nested POSIX class supersedes an apparent external class.
855        For example, [:a[:digit:]b:] matches "a", "b", ":", or a digit. Also,
856        unescaped square brackets may also appear as part of class names. For
857        example, [:a[:abc]b:] gives unknown class "[:abc]b:]". PCRE now behaves
858        more like Perl. (But see 8.20/1 above.)
860    38. PCRE was giving an error for \N with a braced quantifier such as {1,} (this
861        was because it thought it was \N{name}, which is not supported).
863    39. Add minix to OS list not supporting the -S option in pcretest.
865    40. PCRE tries to detect cases of infinite recursion at compile time, but it
866        cannot analyze patterns in sufficient detail to catch mutual recursions
867        such as ((?1))((?2)). There is now a runtime test that gives an error if a
868        subgroup is called recursively as a subpattern for a second time at the
869        same position in the subject string. In previous releases this might have
870        been caught by the recursion limit, or it might have run out of stack.
872    41. A pattern such as /(?(R)a+|(?R)b)/ is quite safe, as the recursion can
873        happen only once. PCRE was, however incorrectly giving a compile time error
874        "recursive call could loop indefinitely" because it cannot analyze the
875        pattern in sufficient detail. The compile time test no longer happens when
876        PCRE is compiling a conditional subpattern, but actual runaway loops are
877        now caught at runtime (see 40 above).
879    42. It seems that Perl allows any characters other than a closing parenthesis
880        to be part of the NAME in (*MARK:NAME) and other backtracking verbs. PCRE
881        has been changed to be the same.
883    43. Updated configure.ac to put in more quoting round AC_LANG_PROGRAM etc. so
884        as not to get warnings when autogen.sh is called. Also changed
885        AC_PROG_LIBTOOL (deprecated) to LT_INIT (the current macro).
887    44. To help people who use pcregrep to scan files containing exceedingly long
888        lines, the following changes have been made:
890        (a) The default value of the buffer size parameter has been increased from
891            8K to 20K. (The actual buffer used is three times this size.)
893        (b) The default can be changed by ./configure --with-pcregrep-bufsize when
894            PCRE is built.
896        (c) A --buffer-size=n option has been added to pcregrep, to allow the size
897            to be set at run time.
899        (d) Numerical values in pcregrep options can be followed by K or M, for
900            example --buffer-size=50K.
902        (e) If a line being scanned overflows pcregrep's buffer, an error is now
903            given and the return code is set to 2.
905    45. Add a pointer to the latest mark to the callout data block.
907    46. The pattern /.(*F)/, when applied to "abc" with PCRE_PARTIAL_HARD, gave a
908        partial match of an empty string instead of no match. This was specific to
909        the use of ".".
911    47. The pattern /f.*/8s, when applied to "for" with PCRE_PARTIAL_HARD, gave a
912        complete match instead of a partial match. This bug was dependent on both
913        the PCRE_UTF8 and PCRE_DOTALL options being set.
915    48. For a pattern such as /\babc|\bdef/ pcre_study() was failing to set up the
916        starting byte set, because \b was not being ignored.
919    Version 8.12 15-Jan-2011
920    ------------------------
922    1.  Fixed some typos in the markup of the man pages, and wrote a script that
923        checks for such things as part of the documentation building process.
925    2.  On a big-endian 64-bit system, pcregrep did not correctly process the
926        --match-limit and --recursion-limit options (added for 8.11). In
927        particular, this made one of the standard tests fail. (The integer value
928        went into the wrong half of a long int.)
930    3.  If the --colour option was given to pcregrep with -v (invert match), it
931        did strange things, either producing crazy output, or crashing. It should,
932        of course, ignore a request for colour when reporting lines that do not
933        match.
935    4.  Another pcregrep bug caused similar problems if --colour was specified with
936        -M (multiline) and the pattern match finished with a line ending.
938    5.  In pcregrep, when a pattern that ended with a literal newline sequence was
939        matched in multiline mode, the following line was shown as part of the
940        match. This seems wrong, so I have changed it.
942    6.  Another pcregrep bug in multiline mode, when --colour was specified, caused
943        the check for further matches in the same line (so they could be coloured)
944        to overrun the end of the current line. If another match was found, it was
945        incorrectly shown (and then shown again when found in the next line).
947    7.  If pcregrep was compiled under Windows, there was a reference to the
948        function pcregrep_exit() before it was defined. I am assuming this was
949        the cause of the "error C2371: 'pcregrep_exit' : redefinition;" that was
950        reported by a user. I've moved the definition above the reference.
953    Version 8.11 10-Dec-2010
954    ------------------------
956    1.  (*THEN) was not working properly if there were untried alternatives prior
957        to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
958        backtracked to try for "b" instead of moving to the next alternative branch
959        at the same level (in this case, to look for "c"). The Perl documentation
960        is clear that when (*THEN) is backtracked onto, it goes to the "next
961        alternative in the innermost enclosing group".
963    2.  (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
964        such as   (A(*COMMIT)B(*THEN)C|D)  any failure after matching A should
965        result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
966        (*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
967        (*THEN).
969    3.  If \s appeared in a character class, it removed the VT character from
970        the class, even if it had been included by some previous item, for example
971        in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
972        of \s, but is part of the POSIX "space" class.)
974    4.  A partial match never returns an empty string (because you can always
975        match an empty string at the end of the subject); however the checking for
976        an empty string was starting at the "start of match" point. This has been
977        changed to the "earliest inspected character" point, because the returned
978        data for a partial match starts at this character. This means that, for
979        example, /(?<=abc)def/ gives a partial match for the subject "abc"
980        (previously it gave "no match").
982    5.  Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
983        of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
984        previously a full match would be given. However, setting PCRE_PARTIAL_HARD
985        has an implication that the given string is incomplete (because a partial
986        match is preferred over a full match). For this reason, these items now
987        give a partial match in this situation. [Aside: previously, the one case
988        /t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
989        match rather than a full match, which was wrong by the old rules, but is
990        now correct.]
992    6.  There was a bug in the handling of #-introduced comments, recognized when
993        PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
994        If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
995        UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
996        scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
997        but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
998        places in pcre_compile().
1000    7.  Related to (6) above, when pcre_compile() was skipping #-introduced
1001        comments when looking ahead for named forward references to subpatterns,
1002        the only newline sequence it recognized was NL. It now handles newlines
1003        according to the set newline convention.
1005    8.  SunOS4 doesn't have strerror() or strtoul(); pcregrep dealt with the
1006        former, but used strtoul(), whereas pcretest avoided strtoul() but did not
1007        cater for a lack of strerror(). These oversights have been fixed.
1009    9.  Added --match-limit and --recursion-limit to pcregrep.
1011    10. Added two casts needed to build with Visual Studio when NO_RECURSE is set.
1013    11. When the -o option was used, pcregrep was setting a return code of 1, even
1014        when matches were found, and --line-buffered was not being honoured.
1016    12. Added an optional parentheses number to the -o and --only-matching options
1017        of pcregrep.
1019    13. Imitating Perl's /g action for multiple matches is tricky when the pattern
1020        can match an empty string. The code to do it in pcretest and pcredemo
1021        needed fixing:
1023        (a) When the newline convention was "crlf", pcretest got it wrong, skipping
1024            only one byte after an empty string match just before CRLF (this case
1025            just got forgotten; "any" and "anycrlf" were OK).
1027        (b) The pcretest code also had a bug, causing it to loop forever in UTF-8
1028            mode when an empty string match preceded an ASCII character followed by
1029            a non-ASCII character. (The code for advancing by one character rather
1030            than one byte was nonsense.)
1032        (c) The pcredemo.c sample program did not have any code at all to handle
1033            the cases when CRLF is a valid newline sequence.
1035    14. Neither pcre_exec() nor pcre_dfa_exec() was checking that the value given
1036        as a starting offset was within the subject string. There is now a new
1037        error, PCRE_ERROR_BADOFFSET, which is returned if the starting offset is
1038        negative or greater than the length of the string. In order to test this,
1039        pcretest is extended to allow the setting of negative starting offsets.
1041    15. In both pcre_exec() and pcre_dfa_exec() the code for checking that the
1042        starting offset points to the beginning of a UTF-8 character was
1043        unnecessarily clumsy. I tidied it up.
1045    16. Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
1046        bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
1048    17. Nobody had reported that the --include_dir option, which was added in
1049        release 7.7 should have been called --include-dir (hyphen, not underscore)
1050        for compatibility with GNU grep. I have changed it to --include-dir, but
1051        left --include_dir as an undocumented synonym, and the same for
1052        --exclude-dir, though that is not available in GNU grep, at least as of
1053        release 2.5.4.
1055    18. At a user's suggestion, the macros GETCHAR and friends (which pick up UTF-8
1056        characters from a string of bytes) have been redefined so as not to use
1057        loops, in order to improve performance in some environments. At the same
1058        time, I abstracted some of the common code into auxiliary macros to save
1059        repetition (this should not affect the compiled code).
1061    19. If \c was followed by a multibyte UTF-8 character, bad things happened. A
1062        compile-time error is now given if \c is not followed by an ASCII
1063        character, that is, a byte less than 128. (In EBCDIC mode, the code is
1064        different, and any byte value is allowed.)
1066    20. Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
1067        START_OPTIMIZE option, which is now allowed at compile time - but just
1068        passed through to pcre_exec() or pcre_dfa_exec(). This makes it available
1069        to pcregrep and other applications that have no direct access to PCRE
1070        options. The new /Y option in pcretest sets this option when calling
1071        pcre_compile().
1073    21. Change 18 of release 8.01 broke the use of named subpatterns for recursive
1074        back references. Groups containing recursive back references were forced to
1075        be atomic by that change, but in the case of named groups, the amount of
1076        memory required was incorrectly computed, leading to "Failed: internal
1077        error: code overflow". This has been fixed.
1079    22. Some patches to pcre_stringpiece.h, pcre_stringpiece_unittest.cc, and
1080        pcretest.c, to avoid build problems in some Borland environments.
1083    Version 8.10 25-Jun-2010
1084    ------------------------
1086    1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
1087        THEN.
1089    2.  (*ACCEPT) was not working when inside an atomic group.
1091    3.  Inside a character class, \B is treated as a literal by default, but
1092        faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
1093        causes the error). The code is unchanged, but I tidied the documentation.
1095    4.  Inside a character class, PCRE always treated \R and \X as literals,
1096        whereas Perl faults them if its -w option is set. I have changed PCRE so
1097        that it faults them when PCRE_EXTRA is set.
1099    5.  Added support for \N, which always matches any character other than
1100        newline. (It is the same as "." when PCRE_DOTALL is not set.)
1102    6.  When compiling pcregrep with newer versions of gcc which may have
1103        FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
1104        declared with attribute warn_unused_result" were given. Just casting the
1105        result to (void) does not stop the warnings; a more elaborate fudge is
1106        needed. I've used a macro to implement this.
1108    7.  Minor change to pcretest.c to avoid a compiler warning.
1110    8.  Added four artifical Unicode properties to help with an option to make
1111        \s etc use properties (see next item). The new properties are: Xan
1112        (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
1114    9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
1115        use Unicode properties. (*UCP) at the start of a pattern can be used to set
1116        this option. Modified pcretest to add /W to test this facility. Added
1117        REG_UCP to make it available via the POSIX interface.
1119    10. Added --line-buffered to pcregrep.
1121    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
1122        studied, and the match started with a letter with a code point greater than
1123        127 whose first byte was different to the first byte of the other case of
1124        the letter, the other case of this starting letter was not recognized
1125        (#976).
1127    12. If a pattern that was studied started with a repeated Unicode property
1128        test, for example, \p{Nd}+, there was the theoretical possibility of
1129        setting up an incorrect bitmap of starting bytes, but fortunately it could
1130        not have actually happened in practice until change 8 above was made (it
1131        added property types that matched character-matching opcodes).
1133    13. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
1134        possible starting bytes for non-anchored patterns.
1136    14. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes
1137        \R, and also a number of cases that involve Unicode properties, both
1138        explicit and implicit when PCRE_UCP is set.
1140    15. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
1141        input, it could crash or give wrong results if characters with values
1142        greater than 0xc0 were present in the subject string. (Detail: it assumed
1143        UTF-8 input when processing these items.)
1145    16. Added a lot of (int) casts to avoid compiler warnings in systems where
1146        size_t is 64-bit (#991).
1148    17. Added a check for running out of memory when PCRE is compiled with
1149        --disable-stack-for-recursion (#990).
1151    18. If the last data line in a file for pcretest does not have a newline on
1152        the end, a newline was missing in the output.
1154    19. The default pcre_chartables.c file recognizes only ASCII characters (values
1155        less than 128) in its various bitmaps. However, there is a facility for
1156        generating tables according to the current locale when PCRE is compiled. It
1157        turns out that in some environments, 0x85 and 0xa0, which are Unicode space
1158        characters, are recognized by isspace() and therefore were getting set in
1159        these tables, and indeed these tables seem to approximate to ISO 8859. This
1160        caused a problem in UTF-8 mode when pcre_study() was used to create a list
1161        of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
1162        which of course cannot start UTF-8 characters. I have changed the code so
1163        that only real ASCII characters (less than 128) and the correct starting
1164        bytes for UTF-8 encodings are set for characters greater than 127 when in
1165        UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
1166        altogether.)
1168    20. Added the /T option to pcretest so as to be able to run tests with non-
1169        standard character tables, thus making it possible to include the tests
1170        used for 19 above in the standard set of tests.
1172    21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
1173        reference to a subpattern the other side of a comment that contains an
1174        opening parenthesis caused either an internal compiling error, or a
1175        reference to the wrong subpattern.
1178    Version 8.02 19-Mar-2010
1179    ------------------------
1181    1.  The Unicode data tables have been updated to Unicode 5.2.0.
1183    2.  Added the option --libs-cpp to pcre-config, but only when C++ support is
1184        configured.
1186    3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the
1187        original author of that file, following a query about its status.
1189    4.  On systems that do not have stdint.h (e.g. Solaris), check for and include
1190        inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.
1192    5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
1193        quantifier applied to a forward-referencing subroutine call, could compile
1194        incorrect code or give the error "internal error: previously-checked
1195        referenced subpattern not found".
1197    6.  Both MS Visual Studio and Symbian OS have problems with initializing
1198        variables to point to external functions. For these systems, therefore,
1199        pcre_malloc etc. are now initialized to local functions that call the
1200        relevant global functions.
1202    7.  There were two entries missing in the vectors called coptable and poptable
1203        in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.
1204        I've fixed the data, and added a kludgy way of testing at compile time that
1205        the lengths are correct (equal to the number of opcodes).
1207    8.  Following on from 7, I added a similar kludge to check the length of the
1208        eint vector in pcreposix.c.
1210    9.  Error texts for pcre_compile() are held as one long string to avoid too
1211        much relocation at load time. To find a text, the string is searched,
1212        counting zeros. There was no check for running off the end of the string,
1213        which could happen if a new error number was added without updating the
1214        string.
1216    10. \K gave a compile-time error if it appeared in a lookbehind assersion.
1218    11. \K was not working if it appeared in an atomic group or in a group that
1219        was called as a "subroutine", or in an assertion. Perl 5.11 documents that
1220        \K is "not well defined" if used in an assertion. PCRE now accepts it if
1221        the assertion is positive, but not if it is negative.
1223    12. Change 11 fortuitously reduced the size of the stack frame used in the
1224        "match()" function of pcre_exec.c by one pointer. Forthcoming
1225        implementation of support for (*MARK) will need an extra pointer on the
1226        stack; I have reserved it now, so that the stack frame size does not
1227        decrease.
1229    13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other
1230        item in branch that calls a recursion is a subroutine call - as in the
1231        second branch in the above example - was incorrectly given the compile-
1232        time error "recursive call could loop indefinitely" because pcre_compile()
1233        was not correctly checking the subroutine for matching a non-empty string.
1235    14. The checks for overrunning compiling workspace could trigger after an
1236        overrun had occurred. This is a "should never occur" error, but it can be
1237        triggered by pathological patterns such as hundreds of nested parentheses.
1238        The checks now trigger 100 bytes before the end of the workspace.
1240    15. Fix typo in configure.ac: "srtoq" should be "strtoq".
1243    Version 8.01 19-Jan-2010
1244    ------------------------
1246    1.  If a pattern contained a conditional subpattern with only one branch (in
1247        particular, this includes all (*DEFINE) patterns), a call to pcre_study()
1248        computed the wrong minimum data length (which is of course zero for such
1249        subpatterns). This could cause incorrect "no match" results.
1251    2.  For patterns such as (?i)a(?-i)b|c where an option setting at the start of
1252        the pattern is reset in the first branch, pcre_compile() failed with
1253        "internal error: code overflow at offset...". This happened only when
1254        the reset was to the original external option setting. (An optimization
1255        abstracts leading options settings into an external setting, which was the
1256        cause of this.)
1258    3.  A pattern such as ^(?!a(*SKIP)b) where a negative assertion contained one
1259        of the verbs SKIP, PRUNE, or COMMIT, did not work correctly. When the
1260        assertion pattern did not match (meaning that the assertion was true), it
1261        was incorrectly treated as false if the SKIP had been reached during the
1262        matching. This also applied to assertions used as conditions.
1264    4.  If an item that is not supported by pcre_dfa_exec() was encountered in an
1265        assertion subpattern, including such a pattern used as a condition,
1266        unpredictable results occurred, instead of the error return
1269    5.  The C++ GlobalReplace function was not working like Perl for the special
1270        situation when an empty string is matched. It now does the fancy magic
1271        stuff that is necessary.
1273    6.  In pcre_internal.h, obsolete includes to setjmp.h and stdarg.h have been
1274        removed. (These were left over from very, very early versions of PCRE.)
1276    7.  Some cosmetic changes to the code to make life easier when compiling it
1277        as part of something else:
1279        (a) Change DEBUG to PCRE_DEBUG.
1281        (b) In pcre_compile(), rename the member of the "branch_chain" structure
1282            called "current" as "current_branch", to prevent a collision with the
1283            Linux macro when compiled as a kernel module.
1285        (c) In pcre_study(), rename the function set_bit() as set_table_bit(), to
1286            prevent a collision with the Linux macro when compiled as a kernel
1287            module.
1289    8.  In pcre_compile() there are some checks for integer overflows that used to
1290        cast potentially large values to (double). This has been changed to that
1291        when building, a check for int64_t is made, and if it is found, it is used
1292        instead, thus avoiding the use of floating point arithmetic. (There is no
1293        other use of FP in PCRE.) If int64_t is not found, the fallback is to
1294        double.
1296    9.  Added two casts to avoid signed/unsigned warnings from VS Studio Express
1297        2005 (difference between two addresses compared to an unsigned value).
1299    10. Change the standard AC_CHECK_LIB test for libbz2 in configure.ac to a
1300        custom one, because of the following reported problem in Windows:
1302          - libbz2 uses the Pascal calling convention (WINAPI) for the functions
1303              under Win32.
1304          - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",
1305              therefore missing the function definition.
1306          - The compiler thus generates a "C" signature for the test function.
1307          - The linker fails to find the "C" function.
1308          - PCRE fails to configure if asked to do so against libbz2.
1310    11. When running libtoolize from libtool-2.2.6b as part of autogen.sh, these
1311        messages were output:
1313          Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and
1314          rerunning libtoolize, to keep the correct libtool macros in-tree.
1315          Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
1317        I have done both of these things.
1319    12. Although pcre_dfa_exec() does not use nearly as much stack as pcre_exec()
1320        most of the time, it *can* run out if it is given a pattern that contains a
1321        runaway infinite recursion. I updated the discussion in the pcrestack man
1322        page.
1324    13. Now that we have gone to the x.xx style of version numbers, the minor
1325        version may start with zero. Using 08 or 09 is a bad idea because users
1326        might check the value of PCRE_MINOR in their code, and 08 or 09 may be
1327        interpreted as invalid octal numbers. I've updated the previous comment in
1328        configure.ac, and also added a check that gives an error if 08 or 09 are
1329        used.
1331    14. Change 8.00/11 was not quite complete: code had been accidentally omitted,
1332        causing partial matching to fail when the end of the subject matched \W
1333        in a UTF-8 pattern where \W was quantified with a minimum of 3.
1335    15. There were some discrepancies between the declarations in pcre_internal.h
1336        of _pcre_is_newline(), _pcre_was_newline(), and _pcre_valid_utf8() and
1337        their definitions. The declarations used "const uschar *" and the
1338        definitions used USPTR. Even though USPTR is normally defined as "const
1339        unsigned char *" (and uschar is typedeffed as "unsigned char"), it was
1340        reported that: "This difference in casting confuses some C++ compilers, for
1341        example, SunCC recognizes above declarations as different functions and
1342        generates broken code for hbpcre." I have changed the declarations to use
1343        USPTR.
1345    16. GNU libtool is named differently on some systems. The autogen.sh script now
1346        tries several variants such as glibtoolize (MacOSX) and libtoolize1x
1347        (FreeBSD).
1349    17. Applied Craig's patch that fixes an HP aCC compile error in pcre 8.00
1350        (strtoXX undefined when compiling pcrecpp.cc). The patch contains this
1351        comment: "Figure out how to create a longlong from a string: strtoll and
1352        equivalent. It's not enough to call AC_CHECK_FUNCS: hpux has a strtoll, for
1353        instance, but it only takes 2 args instead of 3!"
1355    18. A subtle bug concerned with back references has been fixed by a change of
1356        specification, with a corresponding code fix. A pattern such as
1357        ^(xa|=?\1a)+$ which contains a back reference inside the group to which it
1358        refers, was giving matches when it shouldn't. For example, xa=xaaa would
1359        match that pattern. Interestingly, Perl (at least up to 5.11.3) has the
1360        same bug. Such groups have to be quantified to be useful, or contained
1361        inside another quantified group. (If there's no repetition, the reference
1362        can never match.) The problem arises because, having left the group and
1363        moved on to the rest of the pattern, a later failure that backtracks into
1364        the group uses the captured value from the final iteration of the group
1365        rather than the correct earlier one. I have fixed this in PCRE by forcing
1366        any group that contains a reference to itself to be an atomic group; that
1367        is, there cannot be any backtracking into it once it has completed. This is
1368        similar to recursive and subroutine calls.
1371    Version 8.00 19-Oct-09
1372    ----------------------
1374    1.  The table for translating pcre_compile() error codes into POSIX error codes
1375        was out-of-date, and there was no check on the pcre_compile() error code
1376        being within the table. This could lead to an OK return being given in
1377        error.
1379    2.  Changed the call to open a subject file in pcregrep from fopen(pathname,
1380        "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
1381        in a Windows environment.
1383    3.  The pcregrep --count option prints the count for each file even when it is
1384        zero, as does GNU grep. However, pcregrep was also printing all files when
1385        --files-with-matches was added. Now, when both options are given, it prints
1386        counts only for those files that have at least one match. (GNU grep just
1387        prints the file name in this circumstance, but including the count seems
1388        more useful - otherwise, why use --count?) Also ensured that the
1389        combination -clh just lists non-zero counts, with no names.
1391    4.  The long form of the pcregrep -F option was incorrectly implemented as
1392        --fixed_strings instead of --fixed-strings. This is an incompatible change,
1393        but it seems right to fix it, and I didn't think it was worth preserving
1394        the old behaviour.
1396    5.  The command line items --regex=pattern and --regexp=pattern were not
1397        recognized by pcregrep, which required --regex pattern or --regexp pattern
1398        (with a space rather than an '='). The man page documented the '=' forms,
1399        which are compatible with GNU grep; these now work.
1401    6.  No libpcreposix.pc file was created for pkg-config; there was just
1402        libpcre.pc and libpcrecpp.pc. The omission has been rectified.
1404    7.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
1405        when UCP support is not needed, by modifying the Python script that
1406        generates it from Unicode data files. This should not matter if the module
1407        is correctly used as a library, but I received one complaint about 50K of
1408        unwanted data. My guess is that the person linked everything into his
1409        program rather than using a library. Anyway, it does no harm.
1411    8.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
1412        was a minimum greater than 1 for a wide character in a possessive
1413        repetition. The same bug could also affect patterns like /(\x{ff}{0,2})*/8
1414        which had an unlimited repeat of a nested, fixed maximum repeat of a wide
1415        character. Chaos in the form of incorrect output or a compiling loop could
1416        result.
1418    9.  The restrictions on what a pattern can contain when partial matching is
1419        requested for pcre_exec() have been removed. All patterns can now be
1420        partially matched by this function. In addition, if there are at least two
1421        slots in the offset vector, the offset of the earliest inspected character
1422        for the match and the offset of the end of the subject are set in them when
1423        PCRE_ERROR_PARTIAL is returned.
1425    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
1426        synonymous with PCRE_PARTIAL, for backwards compatibility, and
1427        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
1428        and may be more useful for multi-segment matching.
1430    11. Partial matching with pcre_exec() is now more intuitive. A partial match
1431        used to be given if ever the end of the subject was reached; now it is
1432        given only if matching could not proceed because another character was
1433        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
1434        string "Z", which now yields "no match" instead of "partial match". In the
1435        case of pcre_dfa_exec(), "no match" is given if every matching path for the
1436        final character ended with (*FAIL).
1438    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
1439        if the pattern had a "must contain" character that was already found in the
1440        earlier partial match, unless partial matching was again requested. For
1441        example, with the pattern /dog.(body)?/, the "must contain" character is
1442        "g". If the first part-match was for the string "dog", restarting with
1443        "sbody" failed. This bug has been fixed.
1445    13. The string returned by pcre_dfa_exec() after a partial match has been
1446        changed so that it starts at the first inspected character rather than the
1447        first character of the match. This makes a difference only if the pattern
1448        starts with a lookbehind assertion or \b or \B (\K is not supported by
1449        pcre_dfa_exec()). It's an incompatible change, but it makes the two
1450        matching functions compatible, and I think it's the right thing to do.
1452    14. Added a pcredemo man page, created automatically from the pcredemo.c file,
1453        so that the demonstration program is easily available in environments where
1454        PCRE has not been installed from source.
1456    15. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
1457        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
1458        library.
1460    16. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
1461        It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
1462        is not the first non-POSIX option to be added. Clearly some people find
1463        these options useful.
1465    17. If a caller to the POSIX matching function regexec() passes a non-zero
1466        value for nmatch with a NULL value for pmatch, the value of
1467        nmatch is forced to zero.
1469    18. RunGrepTest did not have a test for the availability of the -u option of
1470        the diff command, as RunTest does. It now checks in the same way as
1471        RunTest, and also checks for the -b option.
1473    19. If an odd number of negated classes containing just a single character
1474        interposed, within parentheses, between a forward reference to a named
1475        subpattern and the definition of the subpattern, compilation crashed with
1476        an internal error, complaining that it could not find the referenced
1477        subpattern. An example of a crashing pattern is /(?&A)(([^m])(?<A>))/.
1478        [The bug was that it was starting one character too far in when skipping
1479        over the character class, thus treating the ] as data rather than
1480        terminating the class. This meant it could skip too much.]
1482    20. Added PCRE_NOTEMPTY_ATSTART in order to be able to correctly implement the
1483        /g option in pcretest when the pattern contains \K, which makes it possible
1484        to have an empty string match not at the start, even when the pattern is
1485        anchored. Updated pcretest and pcredemo to use this option.
1487    21. If the maximum number of capturing subpatterns in a recursion was greater
1488        than the maximum at the outer level, the higher number was returned, but
1489        with unset values at the outer level. The correct (outer level) value is
1490        now given.
1492    22. If (*ACCEPT) appeared inside capturing parentheses, previous releases of
1493        PCRE did not set those parentheses (unlike Perl). I have now found a way to
1494        make it do so. The string so far is captured, making this feature
1495        compatible with Perl.
1497    23. The tests have been re-organized, adding tests 11 and 12, to make it
1498        possible to check the Perl 5.10 features against Perl 5.10.
1500    24. Perl 5.10 allows subroutine calls in lookbehinds, as long as the subroutine
1501        pattern matches a fixed length string. PCRE did not allow this; now it
1502        does. Neither allows recursion.
1504    25. I finally figured out how to implement a request to provide the minimum
1505        length of subject string that was needed in order to match a given pattern.
1506        (It was back references and recursion that I had previously got hung up
1507        on.) This code has now been added to pcre_study(); it finds a lower bound
1508        to the length of subject needed. It is not necessarily the greatest lower
1509        bound, but using it to avoid searching strings that are too short does give
1510        some useful speed-ups. The value is available to calling programs via
1511        pcre_fullinfo().
1513    26. While implementing 25, I discovered to my embarrassment that pcretest had
1514        not been passing the result of pcre_study() to pcre_dfa_exec(), so the
1515        study optimizations had never been tested with that matching function.
1516        Oops. What is worse, even when it was passed study data, there was a bug in
1517        pcre_dfa_exec() that meant it never actually used it. Double oops. There
1518        were also very few tests of studied patterns with pcre_dfa_exec().
1520    27. If (?| is used to create subpatterns with duplicate numbers, they are now
1521        allowed to have the same name, even if PCRE_DUPNAMES is not set. However,
1522        on the other side of the coin, they are no longer allowed to have different
1523        names, because these cannot be distinguished in PCRE, and this has caused
1524        confusion. (This is a difference from Perl.)
1526    28. When duplicate subpattern names are present (necessarily with different
1527        numbers, as required by 27 above), and a test is made by name in a
1528        conditional pattern, either for a subpattern having been matched, or for
1529        recursion in such a pattern, all the associated numbered subpatterns are
1530        tested, and the overall condition is true if the condition is true for any
1531        one of them. This is the way Perl works, and is also more like the way
1532        testing by number works.
1535    Version 7.9 11-Apr-09
1536    ---------------------
1538    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
1539        (pcretest), all targets were linked against these libraries. This included
1540        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
1541        libraries. This caused unwanted dependencies to be created. This problem
1542        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
1543        pcretest is linked with readline.
1545    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
1546        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
1547        moved outside it again, because FALSE and TRUE are already defined in AIX,
1548        but BOOL is not.
1550    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
1551        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
1553    4.  The pcregrep documentation said spaces were inserted as well as colons (or
1554        hyphens) following file names and line numbers when outputting matching
1555        lines. This is not true; no spaces are inserted. I have also clarified the
1556        wording for the --colour (or --color) option.
1558    5.  In pcregrep, when --colour was used with -o, the list of matching strings
1559        was not coloured; this is different to GNU grep, so I have changed it to be
1560        the same.
1562    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
1563        each matching line was coloured. Now it goes on to look for further matches
1564        of any of the test patterns, which is the same behaviour as GNU grep.
1566    7.  A pattern that could match an empty string could cause pcregrep to loop; it
1567        doesn't make sense to accept an empty string match in pcregrep, so I have
1568        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
1569        seems to be how GNU grep behaves.
1571    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
1572        start or after a newline", because the conditional assertion was not being
1573        correctly handled. The rule now is that both the assertion and what follows
1574        in the first alternative must satisfy the test.
1576    9.  If auto-callout was enabled in a pattern with a conditional group whose
1577        condition was an assertion, PCRE could crash during matching, both with
1578        pcre_exec() and pcre_dfa_exec().
1580    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
1581        used for matching.
1583    11. Unicode property support in character classes was not working for
1584        characters (bytes) greater than 127 when not in UTF-8 mode.
1586    12. Added the -M command line option to pcretest.
1588    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
1590    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
1592    16. Added comments and documentation about mis-use of no_arg in the C++
1593        wrapper.
1595    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
1596        from Martin Jerabek that uses macro names for all relevant character and
1597        string constants.
1599    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
1600        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
1601        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
1602        these, but not everybody uses configure.
1604    19. A conditional group that had only one branch was not being correctly
1605        recognized as an item that could match an empty string. This meant that an
1606        enclosing group might also not be so recognized, causing infinite looping
1607        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
1608        with the subject "ab", where knowledge that the repeated group can match
1609        nothing is needed in order to break the loop.
1611    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
1612        exec(), but without supplying a callout function, matching went wrong.
1614    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
1615        leak if the size of the offset vector was greater than 30. When the vector
1616        is smaller, the saved offsets during recursion go onto a local stack
1617        vector, but for larger vectors malloc() is used. It was failing to free
1618        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
1619        error, in fact).
1621    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
1622        heapframe that is used only when UTF-8 support is enabled. This caused no
1623        problem, but was untidy.
1625    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
1626        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
1627        included within another project.
1629    24. Steven Van Ingelgem's patches to add more options to the CMake support,
1630        slightly modified by me:
1632          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
1633              not building pcregrep.
1635          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
1636              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
1638    25. Forward references, both numeric and by name, in patterns that made use of
1639        duplicate group numbers, could behave incorrectly or give incorrect errors,
1640        because when scanning forward to find the reference group, PCRE was not
1641        taking into account the duplicate group numbers. A pattern such as
1642        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
1644    26. Changed a few more instances of "const unsigned char *" to USPTR, making
1645        the feature of a custom pointer more persuasive (as requested by a user).
1647    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
1648        pcretest.c, inside #ifndefs, because it seems they are sometimes already
1649        pre-defined.
1651    28. Added support for (*UTF8) at the start of a pattern.
1653    29. Arrange for flags added by the "release type" setting in CMake to be shown
1654        in the configuration summary.
1657    Version 7.8 05-Sep-08
1658    ---------------------
1660    1.  Replaced UCP searching code with optimized version as implemented for Ad
1661        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
1662        stage table and inline lookup instead of a function, giving speed ups of 2
1663        to 5 times on some simple patterns that I tested. Permission was given to
1664        distribute the MultiStage2.py script that generates the tables (it's not in
1665        the tarball, but is in the Subversion repository).
1667    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
1668        scripts.
1670    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
1671        a group with a zero qualifier. The result of the study could be incorrect,
1672        or the function might crash, depending on the pattern.
1674    4.  Caseless matching was not working for non-ASCII characters in back
1675        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
1676        It now works when Unicode Property Support is available.
1678    5.  In pcretest, an escape such as \x{de} in the data was always generating
1679        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
1680        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
1681        truncation.
1683    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
1685    7.  Added two (int) casts to pcregrep when printing the difference of two
1686        pointers, in case they are 64-bit values.
1688    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
1689        test 2 if it fails.
1691    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
1692        and a #define of that name to empty if it is not externally set. This is to
1693        allow users of MSVC to set it if necessary.
1695    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
1696        the convenience functions in the pcre_get.c source file.
1698    11. An option change at the start of a pattern that had top-level alternatives
1699        could cause overwriting and/or a crash. This command provoked a crash in
1700        some environments:
1702          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
1704        This potential security problem was recorded as CVE-2008-2371.
1706    12. For a pattern where the match had to start at the beginning or immediately
1707        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
1708        pcre_dfa_exec() could read past the end of the passed subject if there was
1709        no match. To help with detecting such bugs (e.g. with valgrind), I modified
1710        pcretest so that it places the subject at the end of its malloc-ed buffer.
1712    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
1713        exec() might read past the end of the data buffer in UTF-8 mode.
1715    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
1716        the data contained the byte 0x85 as part of a UTF-8 character within its
1717        first line. This applied both to normal and DFA matching.
1719    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
1720        /^[^d]*?$/8 failed to match "abc".
1722    16. Added a missing copyright notice to pcrecpp_internal.h.
1724    17. Make it more clear in the documentation that values returned from
1725        pcre_exec() in ovector are byte offsets, not character counts.
1727    18. Tidied a few places to stop certain compilers from issuing warnings.
1729    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
1730        supplied by Stefan Weber. I made a further small update for 7.8 because
1731        there is a change of source arrangements: the pcre_searchfuncs.c module is
1732        replaced by pcre_ucd.c.
1735    Version 7.7 07-May-08
1736  ---------------------  ---------------------
1738  1.  Applied Craig's patch to sort out a long long problem: "If we can't convert  1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
1739      a string to a long long, pretend we don't even have a long long." This is      a string to a long long, pretend we don't even have a long long." This is
1740      done by checking for the strtoq, strtoll, and _strtoi64 functions.      done by checking for the strtoq, strtoll, and _strtoi64 functions.
1742  2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with  2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
1743      pre-7.6 versions, which defined a global no_arg variable instead of putting      pre-7.6 versions, which defined a global no_arg variable instead of putting
1744      it in the RE class. (See also #8 below.)      it in the RE class. (See also #8 below.)
1746  3.  Remove a line of dead code, identified by coverity and reported by Nuno  3.  Remove a line of dead code, identified by coverity and reported by Nuno
1747      Lopes.      Lopes.
1749  4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:  4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
1751      (1) The include/exclude patterns were being applied to the whole pathnames      (1) The include/exclude patterns were being applied to the whole pathnames
1752          of files, instead of just to the final components.          of files, instead of just to the final components.
1754      (2) If there was more than one level of directory, the subdirectories were      (2) If there was more than one level of directory, the subdirectories were
1755          skipped unless they satisfied the include/exclude conditions. This is          skipped unless they satisfied the include/exclude conditions. This is
1756          inconsistent with GNU grep (and could even be seen as contrary to the          inconsistent with GNU grep (and could even be seen as contrary to the
1757          pcregrep specification - which I improved to make it absolutely clear).          pcregrep specification - which I improved to make it absolutely clear).
1758          The action now is always to scan all levels of directory, and just          The action now is always to scan all levels of directory, and just
1759          apply the include/exclude patterns to regular files.          apply the include/exclude patterns to regular files.
1761  5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used  5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
1762      --exclude_dir in the tests to avoid scanning .svn directories.      --exclude_dir in the tests to avoid scanning .svn directories.
1764  6.  Applied Craig's patch to the QuoteMeta function so that it escapes the  6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
1765      NUL character as backslash + 0 rather than backslash + NUL, because PCRE      NUL character as backslash + 0 rather than backslash + NUL, because PCRE
1766      doesn't support NULs in patterns.      doesn't support NULs in patterns.
1768  7.  Added some missing "const"s to declarations of static tables in  7.  Added some missing "const"s to declarations of static tables in
1769      pcre_compile.c and pcre_dfa_exec.c.      pcre_compile.c and pcre_dfa_exec.c.
1771  8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was  8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
1772      caused by fix #2  above. (Subsequently also a second patch to fix the      caused by fix #2  above. (Subsequently also a second patch to fix the
1773      first patch. And a third patch - this was a messy problem.)      first patch. And a third patch - this was a messy problem.)
1775  9.  Applied Craig's patch to remove the use of push_back().  9.  Applied Craig's patch to remove the use of push_back().
1777  10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX  10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
1778      matching function regexec().      matching function regexec().
1780  11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',  11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
1781      which, however, unlike Perl's \g{...}, are subroutine calls, not back      which, however, unlike Perl's \g{...}, are subroutine calls, not back
1782      references. PCRE supports relative numbers with this syntax (I don't think      references. PCRE supports relative numbers with this syntax (I don't think
1783      Oniguruma does).      Oniguruma does).
1785  12. Previously, a group with a zero repeat such as (...){0} was completely  12. Previously, a group with a zero repeat such as (...){0} was completely
1786      omitted from the compiled regex. However, this means that if the group      omitted from the compiled regex. However, this means that if the group
1787      was called as a subroutine from elsewhere in the pattern, things went wrong      was called as a subroutine from elsewhere in the pattern, things went wrong
1788      (an internal error was given). Such groups are now left in the compiled      (an internal error was given). Such groups are now left in the compiled
1789      pattern, with a new opcode that causes them to be skipped at execution      pattern, with a new opcode that causes them to be skipped at execution
1790      time.      time.
1792    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
1793        to the way PCRE behaves:
1795        (a) A lone ] character is dis-allowed (Perl treats it as data).
1797        (b) A back reference to an unmatched subpattern matches an empty string
1798            (Perl fails the current match path).
1800        (c) A data ] in a character class must be notated as \] because if the
1801            first data character in a class is ], it defines an empty class. (In
1802            Perl it is not possible to have an empty class.) The empty class []
1803            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
1804            The negative empty class [^] matches any one character, independently
1805            of the DOTALL setting.
1807    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
1808        non-existent subpattern following a character class starting with ']' and
1809        containing () gave an internal compiling error instead of "reference to
1810        non-existent subpattern". Fortunately, when the pattern did exist, the
1811        compiled code was correct. (When scanning forwards to check for the
1812        existencd of the subpattern, it was treating the data ']' as terminating
1813        the class, so got the count wrong. When actually compiling, the reference
1814        was subsequently set up correctly.)
1816    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
1817        it was being rejected as not supported by pcre_dfa_exec(), even though
1818        other assertions are supported. I have made pcre_dfa_exec() support
1819        (*FAIL).
1821    16. The implementation of 13c above involved the invention of a new opcode,
1822        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
1823        cannot be changed at match time, I realized I could make a small
1824        improvement to matching performance by compiling OP_ALLANY instead of
1825        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
1826        on the OP_ANY path.
1828    17. Compiling pcretest on Windows with readline support failed without the
1829        following two fixes: (1) Make the unistd.h include conditional on
1830        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
1832    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
1833        ncurses library to be included for pcretest when ReadLine support is
1834        requested, but also to allow for it to be overridden. This patch came from
1835        Daniel Bergström.
1837    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
1838        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
1839        any errors with the current Unicode tables. Thanks to Peter Kankowski for
1840        spotting this.
1843  Version 7.6 28-Jan-08  Version 7.6 28-Jan-08
1844  ---------------------  ---------------------

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