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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 8.10 03-Jun-2010  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.
20    Version 8.32 30-November-2012
21    -----------------------------
23    1.  Improved JIT compiler optimizations for first character search and single
24        character iterators.
26    2.  Supporting IBM XL C compilers for PPC architectures in the JIT compiler.
27        Patch by Daniel Richard G.
29    3.  Single character iterator optimizations in the JIT compiler.
31    4.  Improved JIT compiler optimizations for character ranges.
33    5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
34        Reported by Giuseppe D'Angelo.
36    6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
37        of a line, was being set incorrectly in cases where .* appeared inside
38        atomic brackets at the start of a pattern, or where there was a subsequent
39        *PRUNE or *SKIP.
41    7.  Improved instruction cache flush for POWER/PowerPC.
42        Patch by Daniel Richard G.
44    8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
45        grep:
47        (a) There is now no limit to the number of patterns to be matched.
49        (b) An error is given if a pattern is too long.
51        (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
52            are now supported.
54        (d) --exclude-from and --include-from (multiple use) have been added.
56        (e) Exclusions and inclusions now apply to all files and directories, not
57            just to those obtained from scanning a directory recursively.
59        (f) Multiple uses of -f and --file-list are now supported.
61        (g) In a Windows environment, the default for -d has been changed from
62            "read" (the GNU grep default) to "skip", because otherwise the presence
63            of a directory in the file list provokes an error.
65        (h) The documentation has been revised and clarified in places.
67    9.  Improve the matching speed of capturing brackets.
69    10. Changed the meaning of \X so that it now matches a Unicode extended
70        grapheme cluster.
72    11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
73        out POSIX threads when JIT support is configured.
75    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
77    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
78        structure could go wrong in environments where size_t is not the same size
79        as int.
81    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
82        set.
84    15. The EBCDIC support had decayed; later updates to the code had included
85        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
86        general tidy up of EBCDIC-related issues, and the documentation was also
87        not quite right. There is now a test that can be run on ASCII systems to
88        check some of the EBCDIC-related things (but is it not a full test).
90    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
91        in a small tidy to the code.
93    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
95    18. If the --only-matching (-o) option in pcregrep is specified multiple
96        times, each one causes appropriate output. For example, -o1 -o2 outputs the
97        substrings matched by the 1st and 2nd capturing parentheses. A separating
98        string can be specified by --om-separator (default empty).
100    19. Improving the first n character searches.
102    20. Turn case lists for horizontal and vertical white space into macros so that
103        they are defined only once.
105    21. This set of changes together give more compatible Unicode case-folding
106        behaviour for characters that have more than one other case when UCP
107        support is available.
109        (a) The Unicode property table now has offsets into a new table of sets of
110            three or more characters that are case-equivalent. The MultiStage2.py
111            script that generates these tables (the pcre_ucd.c file) now scans
112            CaseFolding.txt instead of UnicodeData.txt for character case
113            information.
115        (b) The code for adding characters or ranges of characters to a character
116            class has been abstracted into a generalized function that also handles
117            case-independence. In UTF-mode with UCP support, this uses the new data
118            to handle characters with more than one other case.
120        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
121            whose other case is greater than 256 are now correctly matched
122            caselessly. Previously, the high codepoint matched the low one, but not
123            vice versa.
125        (d) The processing of \h, \H, \v, and \ in character classes now makes use
126            of the new class addition function, using character lists defined as
127            macros alongside the case definitions of 20 above.
129        (e) Caseless back references now work with characters that have more than
130            one other case.
132        (f) General caseless matching of characters with more than one other case
133            is supported.
135    22. Unicode character properties were updated from Unicode 6.2.0
137    23. Improved CMake support under Windows. Patch by Daniel Richard G.
139    24. Add support for 32-bit character strings, and UTF-32
141    25. Major JIT compiler update (code refactoring and bugfixing).
142        Experimental Sparc 32 support is added.
144    26. Applied a modified version of Daniel Richard G's patch to create
145        pcre.h.generic and config.h.generic by "make" instead of in the
146        PrepareRelease script.
148    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
149        pcre_compile.c when checking for a zero character.
151    28. Introducing a native interface for JIT. Through this interface, the compiled
152        machine code can be directly executed. The purpose of this interface is to
153        provide fast pattern matching, so several sanity checks are not performed.
154        However, feature tests are still performed. The new interface provides
155        1.4x speedup compared to the old one.
157    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
158        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
159        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
161    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
162        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
163        the "old" RFC 2279). Instead, it ended up passing a negative length to
164        pcre_exec().
166    31. Add support for GCC's visibility feature to hide internal functions.
168    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
169        "unknown -C option" after outputting 0 or 1.
171    33. There is now support for generating a code coverage report for the test
172        suite in environments where gcc is the compiler and lcov is installed. This
173        is mainly for the benefit of the developers.
175    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
176        unaddressable using valgrind annotations, allowing valgrind to detect
177        invalid memory accesses. This is mainly for the benefit of the developers.
179    25. (*UTF) can now be used to start a pattern in any of the three libraries.
181    26. Give configure error if --enable-cpp but no C++ compiler found.
184    Version 8.31 06-July-2012
185    -------------------------
187    1.  Fixing a wrong JIT test case and some compiler warnings.
189    2.  Removed a bashism from the RunTest script.
191    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
192        to unsigned type, result still unsigned" that was given by an MS compiler
193        on encountering the code "-sizeof(xxx)".
195    4.  Partial matching support is added to the JIT compiler.
197    5.  Fixed several bugs concerned with partial matching of items that consist
198        of more than one character:
200        (a) /^(..)\1/ did not partially match "aba" because checking references was
201            done on an "all or nothing" basis. This also applied to repeated
202            references.
204        (b) \R did not give a hard partial match if \r was found at the end of the
205            subject.
207        (c) \X did not give a hard partial match after matching one or more
208            characters at the end of the subject.
210        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
211            a partial match for the string "\r".
213        (e) When newline was set to CRLF, the metacharacter "." did not recognize
214            a partial match for a CR character at the end of the subject string.
216    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
217        running pcretest, the text "(JIT)" added to the output whenever JIT is
218        actually used to run the match.
220    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
221        or /S+[+] with a digit between 1 and 7.
223    8.  OP_NOT now supports any UTF character not just single-byte ones.
225    9.  (*MARK) control verb is now supported by the JIT compiler.
227    10. The command "./RunTest list" lists the available tests without actually
228        running any of them. (Because I keep forgetting what they all are.)
232    12. Applied a (slightly modified) user-supplied patch that improves performance
233        when the heap is used for recursion (compiled with --disable-stack-for-
234        recursion). Instead of malloc and free for each heap frame each time a
235        logical recursion happens, frames are retained on a chain and re-used where
236        possible. This sometimes gives as much as 30% improvement.
238    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
239        call.
241    14. As documented, (*COMMIT) is now confined to within a positive assertion.
243    15. It is now possible to link pcretest with libedit as an alternative to
244        libreadline.
246    16. (*COMMIT) control verb is now supported by the JIT compiler.
248    17. The Unicode data tables have been updated to Unicode 6.1.0.
250    18. Added --file-list option to pcregrep.
252    19. Added binary file support to pcregrep, including the -a, --binary-files,
253        -I, and --text options.
255    20. The madvise function is renamed for posix_madvise for QNX compatibility
256        reasons. Fixed by Giuseppe D'Angelo.
258    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
260    22. Changed the option for creating symbolic links for 16-bit man pages from
261        -s to -sf so that re-installing does not cause issues.
263    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
265    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
266        matches in certain environments (the workspace was not being correctly
267        retained). Also added to pcre_dfa_exec() a simple plausibility check on
268        some of the workspace data at the beginning of a restart.
270    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
271        was not doing so when it should - probably a typo introduced by SVN 528
272        (change 8.10/14).
274    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
275        \w+ when the character tables indicated that \x{c4} was a word character.
276        There were several related cases, all because the tests for doing a table
277        lookup were testing for characters less than 127 instead of 255.
279    27. If a pattern contains capturing parentheses that are not used in a match,
280        their slots in the ovector are set to -1. For those that are higher than
281        any matched groups, this happens at the end of processing. In the case when
282        there were back references that the ovector was too small to contain
283        (causing temporary malloc'd memory to be used during matching), and the
284        highest capturing number was not used, memory off the end of the ovector
285        was incorrectly being set to -1. (It was using the size of the temporary
286        memory instead of the true size.)
288    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
289        ovector size, it uses memory at the end of the block that it has got.
291    29. Check for an overlong MARK name and give an error at compile time. The
292        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
294    30. JIT compiler update.
296    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
297        Rill for the patch.
299    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
301    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
303    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
304        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
305        was enabled.
307    35. Improve JIT code generation for greedy plus quantifier.
309    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
310        1 to "aa" instead of to an empty string. The bug affected repeated groups
311        that could potentially match an empty string.
313    37. Optimizing single character iterators in JIT.
315    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
316        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
317        codepoints that are too big for the mode are faulted, and in a UTF mode,
318        disallowed codepoints are also faulted.
320    39. If PCRE was compiled with UTF support, in three places in the DFA
321        matcher there was code that should only have been obeyed in UTF mode, but
322        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
323        processing when bytes with values greater than 127 were present. In 16-bit
324        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
325        both cases the values are those that cannot be the first data item in a UTF
326        character. The three items that might have provoked this were recursions,
327        possessively repeated groups, and atomic groups.
329    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
330        and pcregrep, because some OS require shared objects to be explicitly
331        passed to ld, causing the link step to fail if they are not.
333    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
334        mode, patterns that started with \h* or \R* might be incorrectly matched.
337    Version 8.30 04-February-2012
338    -----------------------------
340    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
341        name is defined in ctype.h.
343    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
344        only in quite long subpatterns.
346    3.  Removed the function pcre_info(), which has been obsolete and deprecated
347        since it was replaced by pcre_fullinfo() in February 2000.
349    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
350        match a (*MARK), and the match failed at the start of the subject, a
351        reference to memory before the start of the subject could occur. This bug
352        was introduced by fix 17 of release 8.21.
354    5.  A reference to an unset group with zero minimum repetition was giving
355        totally wrong answers (in non-JavaScript-compatibility mode). For example,
356        /(another)?(\1?)test/ matched against "hello world test". This bug was
357        introduced in release 8.13.
359    6.  Add support for 16-bit character strings (a large amount of work involving
360        many changes and refactorings).
362    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
363        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
364        from a file.
366    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
367        rounding is not applied in this particular case).
369    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
370        if they appear, or are escaped, in patterns.
372    10. Get rid of a number of -Wunused-but-set-variable warnings.
374    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
375        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
376        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
377        also returns the mark "x". This bug applied to capturing parentheses,
378        non-capturing parentheses, and atomic parentheses. It also applied to some
379        assertions.
381    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
382        information out of configure.ac instead of relying on pcre.h.generic, which
383        is not stored in the repository.
385    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
386        -lreadline.
388    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
390    15. Applied Graycode's patch to put the top-level frame on the stack rather
391        than the heap when not using the stack for recursion. This gives a
392        performance improvement in many cases when recursion is not deep.
394    16. Experimental code added to "pcretest -C" to output the stack frame size.
397    Version 8.21 12-Dec-2011
398    ------------------------
400    1.  Updating the JIT compiler.
402    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
403        are added as well.
405    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
406        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
407        calling _pcre_jit_exec. Some extra comments are added.
409    4.  (*MARK) settings inside atomic groups that do not contain any capturing
410        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
411        was introduced by change 18 for 8.20.
413    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
414        ECMA-262 standard.
416    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
417        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
418        This bug was probably introduced by change 9 of 8.13.
420    7.  While fixing 6 above, I noticed that a number of other items were being
421        incorrectly rejected as "not fixed length". This arose partly because newer
422        opcodes had not been added to the fixed-length checking code. I have (a)
423        corrected the bug and added tests for these items, and (b) arranged for an
424        error to occur if an unknown opcode is encountered while checking for fixed
425        length instead of just assuming "not fixed length". The items that were
426        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
427        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
428        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
430    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
431        being incorrectly compiled and would have given unpredicatble results.
433    9.  A possessively repeated subpattern with minimum repeat count greater than
434        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
435        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
436        the first (A) could occur when it should not.
438    10. Add a cast and remove a redundant test from the code.
440    11. JIT should use pcre_malloc/pcre_free for allocation.
442    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
443        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
444        is anything other than /usr, -L is still shown).
446    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
448    14. Perl does not support \N without a following name in a [] class; PCRE now
449        also gives an error.
451    15. If a forward reference was repeated with an upper limit of around 2000,
452        it caused the error "internal error: overran compiling workspace". The
453        maximum number of forward references (including repeats) was limited by the
454        internal workspace, and dependent on the LINK_SIZE. The code has been
455        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
456        the default depends on LINK_SIZE. There is a new upper limit (for safety)
457        of around 200,000 forward references. While doing this, I also speeded up
458        the filling in of repeated forward references.
460    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
461        incorrectly expecting the subject to contain another "a" after the start.
463    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
464        in the match, the SKIP should be ignored. This was not happening; instead
465        the SKIP was being treated as NOMATCH. For patterns such as
466        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
467        tested.
469    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
470        now much more compatible with Perl, in particular in cases where the result
471        is a non-match for a non-anchored pattern. For example, if
472        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
473        "m", where previously it did not return a name. A side effect of this
474        change is that for partial matches, the last encountered mark name is
475        returned, as for non matches. A number of tests that were previously not
476        Perl-compatible have been moved into the Perl-compatible test files. The
477        refactoring has had the pleasing side effect of removing one argument from
478        the match() function, thus reducing its stack requirements.
480    19. If the /S+ option was used in pcretest to study a pattern using JIT,
481        subsequent uses of /S (without +) incorrectly behaved like /S+.
483    21. Retrieve executable code size support for the JIT compiler and fixing
484        some warnings.
486    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
487        not work when the shorter character appeared right at the end of the
488        subject string.
490    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
491        systems.
493    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
494        output it when the /M option is used in pcretest.
496    25. The CheckMan script was not being included in the distribution. Also, added
497        an explicit "perl" to run Perl scripts from the PrepareRelease script
498        because this is reportedly needed in Windows.
500    26. If study data was being save in a file and studying had not found a set of
501        "starts with" bytes for the pattern, the data written to the file (though
502        never used) was taken from uninitialized memory and so caused valgrind to
503        complain.
505    27. Updated RunTest.bat as provided by Sheri Pierce.
507    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
509    29. Computation of memory usage for the table of capturing group names was
510        giving an unnecessarily large value.
513    Version 8.20 21-Oct-2011
514    ------------------------
516    1.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had
517        a POSIX class. After further experiments with Perl, which convinced me that
518        Perl has bugs and confusions, a closing square bracket is no longer allowed
519        in a POSIX name. This bug also affected patterns with classes that started
520        with full stops.
522    2.  If a pattern such as /(a)b|ac/ is matched against "ac", there is no
523        captured substring, but while checking the failing first alternative,
524        substring 1 is temporarily captured. If the output vector supplied to
525        pcre_exec() was not big enough for this capture, the yield of the function
526        was still zero ("insufficient space for captured substrings"). This cannot
527        be totally fixed without adding another stack variable, which seems a lot
528        of expense for a edge case. However, I have improved the situation in cases
529        such as /(a)(b)x|abc/ matched against "abc", where the return code
530        indicates that fewer than the maximum number of slots in the ovector have
531        been set.
533    3.  Related to (2) above: when there are more back references in a pattern than
534        slots in the output vector, pcre_exec() uses temporary memory during
535        matching, and copies in the captures as far as possible afterwards. It was
536        using the entire output vector, but this conflicts with the specification
537        that only 2/3 is used for passing back captured substrings. Now it uses
538        only the first 2/3, for compatibility. This is, of course, another edge
539        case.
541    4.  Zoltan Herczeg's just-in-time compiler support has been integrated into the
542        main code base, and can be used by building with --enable-jit. When this is
543        done, pcregrep automatically uses it unless --disable-pcregrep-jit or the
544        runtime --no-jit option is given.
546    5.  When the number of matches in a pcre_dfa_exec() run exactly filled the
547        ovector, the return from the function was zero, implying that there were
548        other matches that did not fit. The correct "exactly full" value is now
549        returned.
551    6.  If a subpattern that was called recursively or as a subroutine contained
552        (*PRUNE) or any other control that caused it to give a non-standard return,
553        invalid errors such as "Error -26 (nested recursion at the same subject
554        position)" or even infinite loops could occur.
556    7.  If a pattern such as /a(*SKIP)c|b(*ACCEPT)|/ was studied, it stopped
557        computing the minimum length on reaching *ACCEPT, and so ended up with the
558        wrong value of 1 rather than 0. Further investigation indicates that
559        computing a minimum subject length in the presence of *ACCEPT is difficult
560        (think back references, subroutine calls), and so I have changed the code
561        so that no minimum is registered for a pattern that contains *ACCEPT.
563    8.  If (*THEN) was present in the first (true) branch of a conditional group,
564        it was not handled as intended. [But see 16 below.]
566    9.  Replaced RunTest.bat and CMakeLists.txt with improved versions provided by
567        Sheri Pierce.
569    10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that
570        the first byte in a match must be "a".
572    11. Change 17 for 8.13 increased the recursion depth for patterns like
573        /a(?:.)*?a/ drastically. I've improved things by remembering whether a
574        pattern contains any instances of (*THEN). If it does not, the old
575        optimizations are restored. It would be nice to do this on a per-group
576        basis, but at the moment that is not feasible.
578    12. In some environments, the output of pcretest -C is CRLF terminated. This
579        broke RunTest's code that checks for the link size. A single white space
580        character after the value is now allowed for.
582    13. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".
583        For "fr", it uses the Windows-specific input and output files.
585    14. If (*THEN) appeared in a group that was called recursively or as a
586        subroutine, it did not work as intended. [But see next item.]
588    15. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex
589        pattern fragments (but not containing any | characters). If A and B are
590        matched, but there is a failure in C so that it backtracks to (*THEN), PCRE
591        was behaving differently to Perl. PCRE backtracked into A, but Perl goes to
592        D. In other words, Perl considers parentheses that do not contain any |
593        characters to be part of a surrounding alternative, whereas PCRE was
594        treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles
595        differently. PCRE now behaves in the same way as Perl, except in the case
596        of subroutine/recursion calls such as (?1) which have in any case always
597        been different (but PCRE had them first :-).
599    16. Related to 15 above: Perl does not treat the | in a conditional group as
600        creating alternatives. Such a group is treated in the same way as an
601        ordinary group without any | characters when processing (*THEN). PCRE has
602        been changed to match Perl's behaviour.
604    17. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the
605        RunGrepTest script failed.
607    18. Change 22 for version 13 caused atomic groups to use more stack. This is
608        inevitable for groups that contain captures, but it can lead to a lot of
609        stack use in large patterns. The old behaviour has been restored for atomic
610        groups that do not contain any capturing parentheses.
612    19. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not
613        suppress the check for a minimum subject length at run time. (If it was
614        given to pcre_exec() or pcre_dfa_exec() it did work.)
616    20. Fixed an ASCII-dependent infelicity in pcretest that would have made it
617        fail to work when decoding hex characters in data strings in EBCDIC
618        environments.
620    21. It appears that in at least one Mac OS environment, the isxdigit() function
621        is implemented as a macro that evaluates to its argument more than once,
622        contravening the C 90 Standard (I haven't checked a later standard). There
623        was an instance in pcretest which caused it to go wrong when processing
624        \x{...} escapes in subject strings. The has been rewritten to avoid using
625        things like p++ in the argument of isxdigit().
628    Version 8.13 16-Aug-2011
629    ------------------------
631    1.  The Unicode data tables have been updated to Unicode 6.0.0.
633    2.  Two minor typos in pcre_internal.h have been fixed.
635    3.  Added #include <string.h> to pcre_scanner_unittest.cc, pcrecpp.cc, and
636        pcrecpp_unittest.cc. They are needed for strcmp(), memset(), and strchr()
637        in some environments (e.g. Solaris 10/SPARC using Sun Studio 12U2).
639    4.  There were a number of related bugs in the code for matching backrefences
640        caselessly in UTF-8 mode when codes for the characters concerned were
641        different numbers of bytes. For example, U+023A and U+2C65 are an upper
642        and lower case pair, using 2 and 3 bytes, respectively. The main bugs were:
643        (a) A reference to 3 copies of a 2-byte code matched only 2 of a 3-byte
644        code. (b) A reference to 2 copies of a 3-byte code would not match 2 of a
645        2-byte code at the end of the subject (it thought there wasn't enough data
646        left).
648    5.  Comprehensive information about what went wrong is now returned by
649        pcre_exec() and pcre_dfa_exec() when the UTF-8 string check fails, as long
650        as the output vector has at least 2 elements. The offset of the start of
651        the failing character and a reason code are placed in the vector.
653    6.  When the UTF-8 string check fails for pcre_compile(), the offset that is
654        now returned is for the first byte of the failing character, instead of the
655        last byte inspected. This is an incompatible change, but I hope it is small
656        enough not to be a problem. It makes the returned offset consistent with
657        pcre_exec() and pcre_dfa_exec().
659    7.  pcretest now gives a text phrase as well as the error number when
660        pcre_exec() or pcre_dfa_exec() fails; if the error is a UTF-8 check
661        failure, the offset and reason code are output.
663    8.  When \R was used with a maximizing quantifier it failed to skip backwards
664        over a \r\n pair if the subsequent match failed. Instead, it just skipped
665        back over a single character (\n). This seems wrong (because it treated the
666        two characters as a single entity when going forwards), conflicts with the
667        documentation that \R is equivalent to (?>\r\n|\n|...etc), and makes the
668        behaviour of \R* different to (\R)*, which also seems wrong. The behaviour
669        has been changed.
671    9.  Some internal refactoring has changed the processing so that the handling
672        of the PCRE_CASELESS and PCRE_MULTILINE options is done entirely at compile
673        time (the PCRE_DOTALL option was changed this way some time ago: version
674        7.7 change 16). This has made it possible to abolish the OP_OPT op code,
675        which was always a bit of a fudge. It also means that there is one less
676        argument for the match() function, which reduces its stack requirements
677        slightly. This change also fixes an incompatibility with Perl: the pattern
678        (?i:([^b]))(?1) should not match "ab", but previously PCRE gave a match.
680    10. More internal refactoring has drastically reduced the number of recursive
681        calls to match() for possessively repeated groups such as (abc)++ when
682        using pcre_exec().
684    11. While implementing 10, a number of bugs in the handling of groups were
685        discovered and fixed:
687        (?<=(a)+) was not diagnosed as invalid (non-fixed-length lookbehind).
688        (a|)*(?1) gave a compile-time internal error.
689        ((a|)+)+  did not notice that the outer group could match an empty string.
690        (^a|^)+   was not marked as anchored.
691        (.*a|.*)+ was not marked as matching at start or after a newline.
693    12. Yet more internal refactoring has removed another argument from the match()
694        function. Special calls to this function are now indicated by setting a
695        value in a variable in the "match data" data block.
697    13. Be more explicit in pcre_study() instead of relying on "default" for
698        opcodes that mean there is no starting character; this means that when new
699        ones are added and accidentally left out of pcre_study(), testing should
700        pick them up.
702    14. The -s option of pcretest has been documented for ages as being an old
703        synonym of -m (show memory usage). I have changed it to mean "force study
704        for every regex", that is, assume /S for every regex. This is similar to -i
705        and -d etc. It's slightly incompatible, but I'm hoping nobody is still
706        using it. It makes it easier to run collections of tests with and without
707        study enabled, and thereby test pcre_study() more easily. All the standard
708        tests are now run with and without -s (but some patterns can be marked as
709        "never study" - see 20 below).
711    15. When (*ACCEPT) was used in a subpattern that was called recursively, the
712        restoration of the capturing data to the outer values was not happening
713        correctly.
715    16. If a recursively called subpattern ended with (*ACCEPT) and matched an
716        empty string, and PCRE_NOTEMPTY was set, pcre_exec() thought the whole
717        pattern had matched an empty string, and so incorrectly returned a no
718        match.
720    17. There was optimizing code for the last branch of non-capturing parentheses,
721        and also for the obeyed branch of a conditional subexpression, which used
722        tail recursion to cut down on stack usage. Unfortunately, now that there is
723        the possibility of (*THEN) occurring in these branches, tail recursion is
724        no longer possible because the return has to be checked for (*THEN). These
725        two optimizations have therefore been removed. [But see 8.20/11 above.]
727    18. If a pattern containing \R was studied, it was assumed that \R always
728        matched two bytes, thus causing the minimum subject length to be
729        incorrectly computed because \R can also match just one byte.
731    19. If a pattern containing (*ACCEPT) was studied, the minimum subject length
732        was incorrectly computed.
734    20. If /S is present twice on a test pattern in pcretest input, it now
735        *disables* studying, thereby overriding the use of -s on the command line
736        (see 14 above). This is necessary for one or two tests to keep the output
737        identical in both cases.
739    21. When (*ACCEPT) was used in an assertion that matched an empty string and
740        PCRE_NOTEMPTY was set, PCRE applied the non-empty test to the assertion.
742    22. When an atomic group that contained a capturing parenthesis was
743        successfully matched, but the branch in which it appeared failed, the
744        capturing was not being forgotten if a higher numbered group was later
745        captured. For example, /(?>(a))b|(a)c/ when matching "ac" set capturing
746        group 1 to "a", when in fact it should be unset. This applied to multi-
747        branched capturing and non-capturing groups, repeated or not, and also to
748        positive assertions (capturing in negative assertions does not happen
749        in PCRE) and also to nested atomic groups.
751    23. Add the ++ qualifier feature to pcretest, to show the remainder of the
752        subject after a captured substring, to make it easier to tell which of a
753        number of identical substrings has been captured.
755    24. The way atomic groups are processed by pcre_exec() has been changed so that
756        if they are repeated, backtracking one repetition now resets captured
757        values correctly. For example, if ((?>(a+)b)+aabab) is matched against
758        "aaaabaaabaabab" the value of captured group 2 is now correctly recorded as
759        "aaa". Previously, it would have been "a". As part of this code
760        refactoring, the way recursive calls are handled has also been changed.
762    25. If an assertion condition captured any substrings, they were not passed
763        back unless some other capturing happened later. For example, if
764        (?(?=(a))a) was matched against "a", no capturing was returned.
766    26. When studying a pattern that contained subroutine calls or assertions,
767        the code for finding the minimum length of a possible match was handling
768        direct recursions such as (xxx(?1)|yyy) but not mutual recursions (where
769        group 1 called group 2 while simultaneously a separate group 2 called group
770        1). A stack overflow occurred in this case. I have fixed this by limiting
771        the recursion depth to 10.
773    27. Updated RunTest.bat in the distribution to the version supplied by Tom
774        Fortmann. This supports explicit test numbers on the command line, and has
775        argument validation and error reporting.
777    28. An instance of \X with an unlimited repeat could fail if at any point the
778        first character it looked at was a mark character.
780    29. Some minor code refactoring concerning Unicode properties and scripts
781        should reduce the stack requirement of match() slightly.
783    30. Added the '=' option to pcretest to check the setting of unused capturing
784        slots at the end of the pattern, which are documented as being -1, but are
785        not included in the return count.
787    31. If \k was not followed by a braced, angle-bracketed, or quoted name, PCRE
788        compiled something random. Now it gives a compile-time error (as does
789        Perl).
791    32. A *MARK encountered during the processing of a positive assertion is now
792        recorded and passed back (compatible with Perl).
794    33. If --only-matching or --colour was set on a pcregrep call whose pattern
795        had alternative anchored branches, the search for a second match in a line
796        was done as if at the line start. Thus, for example, /^01|^02/ incorrectly
797        matched the line "0102" twice. The same bug affected patterns that started
798        with a backwards assertion. For example /\b01|\b02/ also matched "0102"
799        twice.
801    34. Previously, PCRE did not allow quantification of assertions. However, Perl
802        does, and because of capturing effects, quantifying parenthesized
803        assertions may at times be useful. Quantifiers are now allowed for
804        parenthesized assertions.
806    35. A minor code tidy in pcre_compile() when checking options for \R usage.
808    36. \g was being checked for fancy things in a character class, when it should
809        just be a literal "g".
811    37. PCRE was rejecting [:a[:digit:]] whereas Perl was not. It seems that the
812        appearance of a nested POSIX class supersedes an apparent external class.
813        For example, [:a[:digit:]b:] matches "a", "b", ":", or a digit. Also,
814        unescaped square brackets may also appear as part of class names. For
815        example, [:a[:abc]b:] gives unknown class "[:abc]b:]". PCRE now behaves
816        more like Perl. (But see 8.20/1 above.)
818    38. PCRE was giving an error for \N with a braced quantifier such as {1,} (this
819        was because it thought it was \N{name}, which is not supported).
821    39. Add minix to OS list not supporting the -S option in pcretest.
823    40. PCRE tries to detect cases of infinite recursion at compile time, but it
824        cannot analyze patterns in sufficient detail to catch mutual recursions
825        such as ((?1))((?2)). There is now a runtime test that gives an error if a
826        subgroup is called recursively as a subpattern for a second time at the
827        same position in the subject string. In previous releases this might have
828        been caught by the recursion limit, or it might have run out of stack.
830    41. A pattern such as /(?(R)a+|(?R)b)/ is quite safe, as the recursion can
831        happen only once. PCRE was, however incorrectly giving a compile time error
832        "recursive call could loop indefinitely" because it cannot analyze the
833        pattern in sufficient detail. The compile time test no longer happens when
834        PCRE is compiling a conditional subpattern, but actual runaway loops are
835        now caught at runtime (see 40 above).
837    42. It seems that Perl allows any characters other than a closing parenthesis
838        to be part of the NAME in (*MARK:NAME) and other backtracking verbs. PCRE
839        has been changed to be the same.
841    43. Updated configure.ac to put in more quoting round AC_LANG_PROGRAM etc. so
842        as not to get warnings when autogen.sh is called. Also changed
843        AC_PROG_LIBTOOL (deprecated) to LT_INIT (the current macro).
845    44. To help people who use pcregrep to scan files containing exceedingly long
846        lines, the following changes have been made:
848        (a) The default value of the buffer size parameter has been increased from
849            8K to 20K. (The actual buffer used is three times this size.)
851        (b) The default can be changed by ./configure --with-pcregrep-bufsize when
852            PCRE is built.
854        (c) A --buffer-size=n option has been added to pcregrep, to allow the size
855            to be set at run time.
857        (d) Numerical values in pcregrep options can be followed by K or M, for
858            example --buffer-size=50K.
860        (e) If a line being scanned overflows pcregrep's buffer, an error is now
861            given and the return code is set to 2.
863    45. Add a pointer to the latest mark to the callout data block.
865    46. The pattern /.(*F)/, when applied to "abc" with PCRE_PARTIAL_HARD, gave a
866        partial match of an empty string instead of no match. This was specific to
867        the use of ".".
869    47. The pattern /f.*/8s, when applied to "for" with PCRE_PARTIAL_HARD, gave a
870        complete match instead of a partial match. This bug was dependent on both
871        the PCRE_UTF8 and PCRE_DOTALL options being set.
873    48. For a pattern such as /\babc|\bdef/ pcre_study() was failing to set up the
874        starting byte set, because \b was not being ignored.
877    Version 8.12 15-Jan-2011
878    ------------------------
880    1.  Fixed some typos in the markup of the man pages, and wrote a script that
881        checks for such things as part of the documentation building process.
883    2.  On a big-endian 64-bit system, pcregrep did not correctly process the
884        --match-limit and --recursion-limit options (added for 8.11). In
885        particular, this made one of the standard tests fail. (The integer value
886        went into the wrong half of a long int.)
888    3.  If the --colour option was given to pcregrep with -v (invert match), it
889        did strange things, either producing crazy output, or crashing. It should,
890        of course, ignore a request for colour when reporting lines that do not
891        match.
893    4.  Another pcregrep bug caused similar problems if --colour was specified with
894        -M (multiline) and the pattern match finished with a line ending.
896    5.  In pcregrep, when a pattern that ended with a literal newline sequence was
897        matched in multiline mode, the following line was shown as part of the
898        match. This seems wrong, so I have changed it.
900    6.  Another pcregrep bug in multiline mode, when --colour was specified, caused
901        the check for further matches in the same line (so they could be coloured)
902        to overrun the end of the current line. If another match was found, it was
903        incorrectly shown (and then shown again when found in the next line).
905    7.  If pcregrep was compiled under Windows, there was a reference to the
906        function pcregrep_exit() before it was defined. I am assuming this was
907        the cause of the "error C2371: 'pcregrep_exit' : redefinition;" that was
908        reported by a user. I've moved the definition above the reference.
911    Version 8.11 10-Dec-2010
912    ------------------------
914    1.  (*THEN) was not working properly if there were untried alternatives prior
915        to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
916        backtracked to try for "b" instead of moving to the next alternative branch
917        at the same level (in this case, to look for "c"). The Perl documentation
918        is clear that when (*THEN) is backtracked onto, it goes to the "next
919        alternative in the innermost enclosing group".
921    2.  (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
922        such as   (A(*COMMIT)B(*THEN)C|D)  any failure after matching A should
923        result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
924        (*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
925        (*THEN).
927    3.  If \s appeared in a character class, it removed the VT character from
928        the class, even if it had been included by some previous item, for example
929        in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
930        of \s, but is part of the POSIX "space" class.)
932    4.  A partial match never returns an empty string (because you can always
933        match an empty string at the end of the subject); however the checking for
934        an empty string was starting at the "start of match" point. This has been
935        changed to the "earliest inspected character" point, because the returned
936        data for a partial match starts at this character. This means that, for
937        example, /(?<=abc)def/ gives a partial match for the subject "abc"
938        (previously it gave "no match").
940    5.  Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
941        of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
942        previously a full match would be given. However, setting PCRE_PARTIAL_HARD
943        has an implication that the given string is incomplete (because a partial
944        match is preferred over a full match). For this reason, these items now
945        give a partial match in this situation. [Aside: previously, the one case
946        /t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
947        match rather than a full match, which was wrong by the old rules, but is
948        now correct.]
950    6.  There was a bug in the handling of #-introduced comments, recognized when
951        PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
952        If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
953        UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
954        scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
955        but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
956        places in pcre_compile().
958    7.  Related to (6) above, when pcre_compile() was skipping #-introduced
959        comments when looking ahead for named forward references to subpatterns,
960        the only newline sequence it recognized was NL. It now handles newlines
961        according to the set newline convention.
963    8.  SunOS4 doesn't have strerror() or strtoul(); pcregrep dealt with the
964        former, but used strtoul(), whereas pcretest avoided strtoul() but did not
965        cater for a lack of strerror(). These oversights have been fixed.
967    9.  Added --match-limit and --recursion-limit to pcregrep.
969    10. Added two casts needed to build with Visual Studio when NO_RECURSE is set.
971    11. When the -o option was used, pcregrep was setting a return code of 1, even
972        when matches were found, and --line-buffered was not being honoured.
974    12. Added an optional parentheses number to the -o and --only-matching options
975        of pcregrep.
977    13. Imitating Perl's /g action for multiple matches is tricky when the pattern
978        can match an empty string. The code to do it in pcretest and pcredemo
979        needed fixing:
981        (a) When the newline convention was "crlf", pcretest got it wrong, skipping
982            only one byte after an empty string match just before CRLF (this case
983            just got forgotten; "any" and "anycrlf" were OK).
985        (b) The pcretest code also had a bug, causing it to loop forever in UTF-8
986            mode when an empty string match preceded an ASCII character followed by
987            a non-ASCII character. (The code for advancing by one character rather
988            than one byte was nonsense.)
990        (c) The pcredemo.c sample program did not have any code at all to handle
991            the cases when CRLF is a valid newline sequence.
993    14. Neither pcre_exec() nor pcre_dfa_exec() was checking that the value given
994        as a starting offset was within the subject string. There is now a new
995        error, PCRE_ERROR_BADOFFSET, which is returned if the starting offset is
996        negative or greater than the length of the string. In order to test this,
997        pcretest is extended to allow the setting of negative starting offsets.
999    15. In both pcre_exec() and pcre_dfa_exec() the code for checking that the
1000        starting offset points to the beginning of a UTF-8 character was
1001        unnecessarily clumsy. I tidied it up.
1003    16. Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
1004        bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
1006    17. Nobody had reported that the --include_dir option, which was added in
1007        release 7.7 should have been called --include-dir (hyphen, not underscore)
1008        for compatibility with GNU grep. I have changed it to --include-dir, but
1009        left --include_dir as an undocumented synonym, and the same for
1010        --exclude-dir, though that is not available in GNU grep, at least as of
1011        release 2.5.4.
1013    18. At a user's suggestion, the macros GETCHAR and friends (which pick up UTF-8
1014        characters from a string of bytes) have been redefined so as not to use
1015        loops, in order to improve performance in some environments. At the same
1016        time, I abstracted some of the common code into auxiliary macros to save
1017        repetition (this should not affect the compiled code).
1019    19. If \c was followed by a multibyte UTF-8 character, bad things happened. A
1020        compile-time error is now given if \c is not followed by an ASCII
1021        character, that is, a byte less than 128. (In EBCDIC mode, the code is
1022        different, and any byte value is allowed.)
1024    20. Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
1025        START_OPTIMIZE option, which is now allowed at compile time - but just
1026        passed through to pcre_exec() or pcre_dfa_exec(). This makes it available
1027        to pcregrep and other applications that have no direct access to PCRE
1028        options. The new /Y option in pcretest sets this option when calling
1029        pcre_compile().
1031    21. Change 18 of release 8.01 broke the use of named subpatterns for recursive
1032        back references. Groups containing recursive back references were forced to
1033        be atomic by that change, but in the case of named groups, the amount of
1034        memory required was incorrectly computed, leading to "Failed: internal
1035        error: code overflow". This has been fixed.
1037    22. Some patches to pcre_stringpiece.h, pcre_stringpiece_unittest.cc, and
1038        pcretest.c, to avoid build problems in some Borland environments.
1041    Version 8.10 25-Jun-2010
1042  ------------------------  ------------------------
1044  1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and  1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
# Line 42  Version 8.10 03-Jun-2010 Line 1079  Version 8.10 03-Jun-2010
1079  11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was  11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
1080      studied, and the match started with a letter with a code point greater than      studied, and the match started with a letter with a code point greater than
1081      127 whose first byte was different to the first byte of the other case of      127 whose first byte was different to the first byte of the other case of
1082      the letter, the other case of this starting letter was not recognized      the letter, the other case of this starting letter was not recognized
1083      (#976).      (#976).
1085  12. If a pattern that was studied started with a repeated Unicode property  12. If a pattern that was studied started with a repeated Unicode property
# Line 68  Version 8.10 03-Jun-2010 Line 1105  Version 8.10 03-Jun-2010
1106  17. Added a check for running out of memory when PCRE is compiled with  17. Added a check for running out of memory when PCRE is compiled with
1107      --disable-stack-for-recursion (#990).      --disable-stack-for-recursion (#990).
1109  18. If the last data line in a file for pcretest does not have a newline on  18. If the last data line in a file for pcretest does not have a newline on
1110      the end, a newline was missing in the output.      the end, a newline was missing in the output.
1112  19. The default pcre_chartables.c file recognizes only ASCII characters (values  19. The default pcre_chartables.c file recognizes only ASCII characters (values
1113      less than 128) in its various bitmaps. However, there is a facility for      less than 128) in its various bitmaps. However, there is a facility for
1114      generating tables according to the current locale when PCRE is compiled. It      generating tables according to the current locale when PCRE is compiled. It
1115      turns out that in some environments, 0x85 and 0xa0, which are Unicode space      turns out that in some environments, 0x85 and 0xa0, which are Unicode space
1116      characters, are recognized by isspace() and therefore were getting set in      characters, are recognized by isspace() and therefore were getting set in
1117      these tables. This caused a problem in UTF-8 mode when pcre_study() was      these tables, and indeed these tables seem to approximate to ISO 8859. This
1118      used to create a list of bytes that can start a match. For \s, it was      caused a problem in UTF-8 mode when pcre_study() was used to create a list
1119      including 0x85 and 0xa0, which of course cannot start UTF-8 characters. I      of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
1120      have changed the code so that only real ASCII characters (less than 128)      which of course cannot start UTF-8 characters. I have changed the code so
1121      and the correct starting bytes for UTF-8 encodings are set in this case.      that only real ASCII characters (less than 128) and the correct starting
1122      (When PCRE_UCP is set - see 9 above - the code is different altogether.)      bytes for UTF-8 encodings are set for characters greater than 127 when in
1123        UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
1124        altogether.)
1126    20. Added the /T option to pcretest so as to be able to run tests with non-
1127        standard character tables, thus making it possible to include the tests
1128        used for 19 above in the standard set of tests.
1130    21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
1131        reference to a subpattern the other side of a comment that contains an
1132        opening parenthesis caused either an internal compiling error, or a
1133        reference to the wrong subpattern.
1136  Version 8.02 19-Mar-2010  Version 8.02 19-Mar-2010

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