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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 8.21  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.
61    15. JIT compiler now supports 32 bit Macs thanks to Lawrence Velazquez.
63    16. Partial matches now set offsets[2] to the "bumpalong" value, that is, the
64        offset of the starting point of the matching process, provided the offsets
65        vector is large enough.
67    17. The \A escape now records a lookbehind value of 1, though its execution
68        does not actually inspect the previous character. This is to ensure that,
69        in partial multi-segment matching, at least one character from the old
70        segment is retained when a new segment is processed. Otherwise, if there
71        are no lookbehinds in the pattern, \A might match incorrectly at the start
72        of a new segment.
74    18. Added some #ifdef __VMS code into pcretest.c to help VMS implementations.
76    19. Redefined some pcre_uchar variables in pcre_exec.c as pcre_uint32; this
77        gives some modest performance improvement in 8-bit mode.
79    20. Added the PCRE-specific property \p{Xuc} for matching characters that can
80        be expressed in certain programming languages using Universal Character
81        Names.
83    21. Unicode validation has been updated in the light of Unicode Corrigendum #9,
84        which points out that "non characters" are not "characters that may not
85        appear in Unicode strings" but rather "characters that are reserved for
86        internal use and have only local meaning".
88    22. When a pattern was compiled with automatic callouts (PCRE_AUTO_CALLOUT) and
89        there was a conditional group that depended on an assertion, if the
90        assertion was false, the callout that immediately followed the alternation
91        in the condition was skipped when pcre_exec() was used for matching.
93    23. Allow an explicit callout to be inserted before an assertion that is the
94        condition for a conditional group, for compatibility with automatic
95        callouts, which always insert a callout at this point.
97    24. In 8.31, (*COMMIT) was confined to within a recursive subpattern. Perl also
98        confines (*SKIP) and (*PRUNE) in the same way, and this has now been done.
100    25. (*PRUNE) is now supported by the JIT compiler.
102    26. Fix infinite loop when /(?<=(*SKIP)ac)a/ is matched against aa.
104    27. Fix the case where there are two or more SKIPs with arguments that may be
105        ignored.
107    28. (*SKIP) is now supported by the JIT compiler.
109    29. (*THEN) is now supported by the JIT compiler.
111    30. Update RunTest with additional test selector options.
113    31. The way PCRE handles backtracking verbs has been changed in two ways.
115        (1) Previously, in something like (*COMMIT)(*SKIP), COMMIT would override
116        SKIP. Now, PCRE acts on whichever backtracking verb is reached first by
117        backtracking. In some cases this makes it more Perl-compatible, but Perl's
118        rather obscure rules do not always do the same thing.
120        (2) Previously, backtracking verbs were confined within assertions. This is
121        no longer the case for positive assertions, except for (*ACCEPT). Again,
122        this sometimes improves Perl compatibility, and sometimes does not.
124    32. A number of tests that were in test 2 because Perl did things differently
125        have been moved to test 1, because either Perl or PCRE has changed, and
126        these tests are now compatible.
128    32. Control verbs are handled in the same way in JIT and interpreter.
130    33. An opening parenthesis in a MARK/PRUNE/SKIP/THEN name in a pattern that
131        contained a forward subroutine reference caused a compile error.
133    34. Auto-detect and optimize limited repetitions in JIT.
135    35. Implement PCRE_NEVER_UTF to lock out the use of UTF, in particular,
136        blocking (*UTF) etc.
138    36. In the interpreter, maximizing pattern repetitions for characters and
139        character types now use tail recursion, which reduces stack usage.
142    Version 8.32 30-November-2012
143    -----------------------------
145    1.  Improved JIT compiler optimizations for first character search and single
146        character iterators.
148    2.  Supporting IBM XL C compilers for PPC architectures in the JIT compiler.
149        Patch by Daniel Richard G.
151    3.  Single character iterator optimizations in the JIT compiler.
153    4.  Improved JIT compiler optimizations for character ranges.
155    5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
156        Reported by Giuseppe D'Angelo.
158    6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
159        of a line, was being set incorrectly in cases where .* appeared inside
160        atomic brackets at the start of a pattern, or where there was a subsequent
161        *PRUNE or *SKIP.
163    7.  Improved instruction cache flush for POWER/PowerPC.
164        Patch by Daniel Richard G.
166    8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
167        grep:
169        (a) There is now no limit to the number of patterns to be matched.
171        (b) An error is given if a pattern is too long.
173        (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
174            are now supported.
176        (d) --exclude-from and --include-from (multiple use) have been added.
178        (e) Exclusions and inclusions now apply to all files and directories, not
179            just to those obtained from scanning a directory recursively.
181        (f) Multiple uses of -f and --file-list are now supported.
183        (g) In a Windows environment, the default for -d has been changed from
184            "read" (the GNU grep default) to "skip", because otherwise the presence
185            of a directory in the file list provokes an error.
187        (h) The documentation has been revised and clarified in places.
189    9.  Improve the matching speed of capturing brackets.
191    10. Changed the meaning of \X so that it now matches a Unicode extended
192        grapheme cluster.
194    11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
195        out POSIX threads when JIT support is configured.
197    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
199    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
200        structure could go wrong in environments where size_t is not the same size
201        as int.
203    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
204        set.
206    15. The EBCDIC support had decayed; later updates to the code had included
207        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
208        general tidy up of EBCDIC-related issues, and the documentation was also
209        not quite right. There is now a test that can be run on ASCII systems to
210        check some of the EBCDIC-related things (but is it not a full test).
212    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
213        in a small tidy to the code.
215    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
217    18. If the --only-matching (-o) option in pcregrep is specified multiple
218        times, each one causes appropriate output. For example, -o1 -o2 outputs the
219        substrings matched by the 1st and 2nd capturing parentheses. A separating
220        string can be specified by --om-separator (default empty).
222    19. Improving the first n character searches.
224    20. Turn case lists for horizontal and vertical white space into macros so that
225        they are defined only once.
227    21. This set of changes together give more compatible Unicode case-folding
228        behaviour for characters that have more than one other case when UCP
229        support is available.
231        (a) The Unicode property table now has offsets into a new table of sets of
232            three or more characters that are case-equivalent. The MultiStage2.py
233            script that generates these tables (the pcre_ucd.c file) now scans
234            CaseFolding.txt instead of UnicodeData.txt for character case
235            information.
237        (b) The code for adding characters or ranges of characters to a character
238            class has been abstracted into a generalized function that also handles
239            case-independence. In UTF-mode with UCP support, this uses the new data
240            to handle characters with more than one other case.
242        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
243            whose other case is greater than 256 are now correctly matched
244            caselessly. Previously, the high codepoint matched the low one, but not
245            vice versa.
247        (d) The processing of \h, \H, \v, and \ in character classes now makes use
248            of the new class addition function, using character lists defined as
249            macros alongside the case definitions of 20 above.
251        (e) Caseless back references now work with characters that have more than
252            one other case.
254        (f) General caseless matching of characters with more than one other case
255            is supported.
257    22. Unicode character properties were updated from Unicode 6.2.0
259    23. Improved CMake support under Windows. Patch by Daniel Richard G.
261    24. Add support for 32-bit character strings, and UTF-32
263    25. Major JIT compiler update (code refactoring and bugfixing).
264        Experimental Sparc 32 support is added.
266    26. Applied a modified version of Daniel Richard G's patch to create
267        pcre.h.generic and config.h.generic by "make" instead of in the
268        PrepareRelease script.
270    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
271        pcre_compile.c when checking for a zero character.
273    28. Introducing a native interface for JIT. Through this interface, the compiled
274        machine code can be directly executed. The purpose of this interface is to
275        provide fast pattern matching, so several sanity checks are not performed.
276        However, feature tests are still performed. The new interface provides
277        1.4x speedup compared to the old one.
279    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
280        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
281        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
283    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
284        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
285        the "old" RFC 2279). Instead, it ended up passing a negative length to
286        pcre_exec().
288    31. Add support for GCC's visibility feature to hide internal functions.
290    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
291        "unknown -C option" after outputting 0 or 1.
293    33. There is now support for generating a code coverage report for the test
294        suite in environments where gcc is the compiler and lcov is installed. This
295        is mainly for the benefit of the developers.
297    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
298        unaddressable using valgrind annotations, allowing valgrind to detect
299        invalid memory accesses. This is mainly for the benefit of the developers.
301    25. (*UTF) can now be used to start a pattern in any of the three libraries.
303    26. Give configure error if --enable-cpp but no C++ compiler found.
306    Version 8.31 06-July-2012
307    -------------------------
309    1.  Fixing a wrong JIT test case and some compiler warnings.
311    2.  Removed a bashism from the RunTest script.
313    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
314        to unsigned type, result still unsigned" that was given by an MS compiler
315        on encountering the code "-sizeof(xxx)".
317    4.  Partial matching support is added to the JIT compiler.
319    5.  Fixed several bugs concerned with partial matching of items that consist
320        of more than one character:
322        (a) /^(..)\1/ did not partially match "aba" because checking references was
323            done on an "all or nothing" basis. This also applied to repeated
324            references.
326        (b) \R did not give a hard partial match if \r was found at the end of the
327            subject.
329        (c) \X did not give a hard partial match after matching one or more
330            characters at the end of the subject.
332        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
333            a partial match for the string "\r".
335        (e) When newline was set to CRLF, the metacharacter "." did not recognize
336            a partial match for a CR character at the end of the subject string.
338    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
339        running pcretest, the text "(JIT)" added to the output whenever JIT is
340        actually used to run the match.
342    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
343        or /S+[+] with a digit between 1 and 7.
345    8.  OP_NOT now supports any UTF character not just single-byte ones.
347    9.  (*MARK) control verb is now supported by the JIT compiler.
349    10. The command "./RunTest list" lists the available tests without actually
350        running any of them. (Because I keep forgetting what they all are.)
354    12. Applied a (slightly modified) user-supplied patch that improves performance
355        when the heap is used for recursion (compiled with --disable-stack-for-
356        recursion). Instead of malloc and free for each heap frame each time a
357        logical recursion happens, frames are retained on a chain and re-used where
358        possible. This sometimes gives as much as 30% improvement.
360    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
361        call.
363    14. As documented, (*COMMIT) is now confined to within a positive assertion.
365    15. It is now possible to link pcretest with libedit as an alternative to
366        libreadline.
368    16. (*COMMIT) control verb is now supported by the JIT compiler.
370    17. The Unicode data tables have been updated to Unicode 6.1.0.
372    18. Added --file-list option to pcregrep.
374    19. Added binary file support to pcregrep, including the -a, --binary-files,
375        -I, and --text options.
377    20. The madvise function is renamed for posix_madvise for QNX compatibility
378        reasons. Fixed by Giuseppe D'Angelo.
380    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
382    22. Changed the option for creating symbolic links for 16-bit man pages from
383        -s to -sf so that re-installing does not cause issues.
385    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
387    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
388        matches in certain environments (the workspace was not being correctly
389        retained). Also added to pcre_dfa_exec() a simple plausibility check on
390        some of the workspace data at the beginning of a restart.
392    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
393        was not doing so when it should - probably a typo introduced by SVN 528
394        (change 8.10/14).
396    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
397        \w+ when the character tables indicated that \x{c4} was a word character.
398        There were several related cases, all because the tests for doing a table
399        lookup were testing for characters less than 127 instead of 255.
401    27. If a pattern contains capturing parentheses that are not used in a match,
402        their slots in the ovector are set to -1. For those that are higher than
403        any matched groups, this happens at the end of processing. In the case when
404        there were back references that the ovector was too small to contain
405        (causing temporary malloc'd memory to be used during matching), and the
406        highest capturing number was not used, memory off the end of the ovector
407        was incorrectly being set to -1. (It was using the size of the temporary
408        memory instead of the true size.)
410    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
411        ovector size, it uses memory at the end of the block that it has got.
413    29. Check for an overlong MARK name and give an error at compile time. The
414        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
416    30. JIT compiler update.
418    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
419        Rill for the patch.
421    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
423    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
425    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
426        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
427        was enabled.
429    35. Improve JIT code generation for greedy plus quantifier.
431    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
432        1 to "aa" instead of to an empty string. The bug affected repeated groups
433        that could potentially match an empty string.
435    37. Optimizing single character iterators in JIT.
437    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
438        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
439        codepoints that are too big for the mode are faulted, and in a UTF mode,
440        disallowed codepoints are also faulted.
442    39. If PCRE was compiled with UTF support, in three places in the DFA
443        matcher there was code that should only have been obeyed in UTF mode, but
444        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
445        processing when bytes with values greater than 127 were present. In 16-bit
446        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
447        both cases the values are those that cannot be the first data item in a UTF
448        character. The three items that might have provoked this were recursions,
449        possessively repeated groups, and atomic groups.
451    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
452        and pcregrep, because some OS require shared objects to be explicitly
453        passed to ld, causing the link step to fail if they are not.
455    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
456        mode, patterns that started with \h* or \R* might be incorrectly matched.
459    Version 8.30 04-February-2012
460    -----------------------------
462    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
463        name is defined in ctype.h.
465    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
466        only in quite long subpatterns.
468    3.  Removed the function pcre_info(), which has been obsolete and deprecated
469        since it was replaced by pcre_fullinfo() in February 2000.
471    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
472        match a (*MARK), and the match failed at the start of the subject, a
473        reference to memory before the start of the subject could occur. This bug
474        was introduced by fix 17 of release 8.21.
476    5.  A reference to an unset group with zero minimum repetition was giving
477        totally wrong answers (in non-JavaScript-compatibility mode). For example,
478        /(another)?(\1?)test/ matched against "hello world test". This bug was
479        introduced in release 8.13.
481    6.  Add support for 16-bit character strings (a large amount of work involving
482        many changes and refactorings).
484    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
485        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
486        from a file.
488    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
489        rounding is not applied in this particular case).
491    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
492        if they appear, or are escaped, in patterns.
494    10. Get rid of a number of -Wunused-but-set-variable warnings.
496    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
497        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
498        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
499        also returns the mark "x". This bug applied to capturing parentheses,
500        non-capturing parentheses, and atomic parentheses. It also applied to some
501        assertions.
503    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
504        information out of configure.ac instead of relying on pcre.h.generic, which
505        is not stored in the repository.
507    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
508        -lreadline.
510    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
512    15. Applied Graycode's patch to put the top-level frame on the stack rather
513        than the heap when not using the stack for recursion. This gives a
514        performance improvement in many cases when recursion is not deep.
516    16. Experimental code added to "pcretest -C" to output the stack frame size.
519    Version 8.21 12-Dec-2011
520    ------------------------
522  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
524    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
525        are added as well.
527    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
528        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
529        calling _pcre_jit_exec. Some extra comments are added.
531    4.  (*MARK) settings inside atomic groups that do not contain any capturing
532        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
533        was introduced by change 18 for 8.20.
535    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
536        ECMA-262 standard.
538    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
539        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
540        This bug was probably introduced by change 9 of 8.13.
542    7.  While fixing 6 above, I noticed that a number of other items were being
543        incorrectly rejected as "not fixed length". This arose partly because newer
544        opcodes had not been added to the fixed-length checking code. I have (a)
545        corrected the bug and added tests for these items, and (b) arranged for an
546        error to occur if an unknown opcode is encountered while checking for fixed
547        length instead of just assuming "not fixed length". The items that were
548        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
549        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
550        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
552    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
553        being incorrectly compiled and would have given unpredicatble results.
555    9.  A possessively repeated subpattern with minimum repeat count greater than
556        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
557        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
558        the first (A) could occur when it should not.
560    10. Add a cast and remove a redundant test from the code.
562    11. JIT should use pcre_malloc/pcre_free for allocation.
564    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
565        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
566        is anything other than /usr, -L is still shown).
568    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
570    14. Perl does not support \N without a following name in a [] class; PCRE now
571        also gives an error.
573    15. If a forward reference was repeated with an upper limit of around 2000,
574        it caused the error "internal error: overran compiling workspace". The
575        maximum number of forward references (including repeats) was limited by the
576        internal workspace, and dependent on the LINK_SIZE. The code has been
577        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
578        the default depends on LINK_SIZE. There is a new upper limit (for safety)
579        of around 200,000 forward references. While doing this, I also speeded up
580        the filling in of repeated forward references.
582    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
583        incorrectly expecting the subject to contain another "a" after the start.
585    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
586        in the match, the SKIP should be ignored. This was not happening; instead
587        the SKIP was being treated as NOMATCH. For patterns such as
588        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
589        tested.
591    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
592        now much more compatible with Perl, in particular in cases where the result
593        is a non-match for a non-anchored pattern. For example, if
594        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
595        "m", where previously it did not return a name. A side effect of this
596        change is that for partial matches, the last encountered mark name is
597        returned, as for non matches. A number of tests that were previously not
598        Perl-compatible have been moved into the Perl-compatible test files. The
599        refactoring has had the pleasing side effect of removing one argument from
600        the match() function, thus reducing its stack requirements.
602    19. If the /S+ option was used in pcretest to study a pattern using JIT,
603        subsequent uses of /S (without +) incorrectly behaved like /S+.
605    21. Retrieve executable code size support for the JIT compiler and fixing
606        some warnings.
608    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
609        not work when the shorter character appeared right at the end of the
610        subject string.
612    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
613        systems.
615    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
616        output it when the /M option is used in pcretest.
618    25. The CheckMan script was not being included in the distribution. Also, added
619        an explicit "perl" to run Perl scripts from the PrepareRelease script
620        because this is reportedly needed in Windows.
622    26. If study data was being save in a file and studying had not found a set of
623        "starts with" bytes for the pattern, the data written to the file (though
624        never used) was taken from uninitialized memory and so caused valgrind to
625        complain.
627    27. Updated RunTest.bat as provided by Sheri Pierce.
629    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
631    29. Computation of memory usage for the table of capturing group names was
632        giving an unnecessarily large value.
635  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011
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