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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.
136    Version 8.32 30-November-2012
137    -----------------------------
139    1.  Improved JIT compiler optimizations for first character search and single
140        character iterators.
142    2.  Supporting IBM XL C compilers for PPC architectures in the JIT compiler.
143        Patch by Daniel Richard G.
145    3.  Single character iterator optimizations in the JIT compiler.
147    4.  Improved JIT compiler optimizations for character ranges.
149    5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
150        Reported by Giuseppe D'Angelo.
152    6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
153        of a line, was being set incorrectly in cases where .* appeared inside
154        atomic brackets at the start of a pattern, or where there was a subsequent
155        *PRUNE or *SKIP.
157    7.  Improved instruction cache flush for POWER/PowerPC.
158        Patch by Daniel Richard G.
160    8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
161        grep:
163        (a) There is now no limit to the number of patterns to be matched.
165        (b) An error is given if a pattern is too long.
167        (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
168            are now supported.
170        (d) --exclude-from and --include-from (multiple use) have been added.
172        (e) Exclusions and inclusions now apply to all files and directories, not
173            just to those obtained from scanning a directory recursively.
175        (f) Multiple uses of -f and --file-list are now supported.
177        (g) In a Windows environment, the default for -d has been changed from
178            "read" (the GNU grep default) to "skip", because otherwise the presence
179            of a directory in the file list provokes an error.
181        (h) The documentation has been revised and clarified in places.
183    9.  Improve the matching speed of capturing brackets.
185    10. Changed the meaning of \X so that it now matches a Unicode extended
186        grapheme cluster.
188    11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
189        out POSIX threads when JIT support is configured.
191    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
193    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
194        structure could go wrong in environments where size_t is not the same size
195        as int.
197    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
198        set.
200    15. The EBCDIC support had decayed; later updates to the code had included
201        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
202        general tidy up of EBCDIC-related issues, and the documentation was also
203        not quite right. There is now a test that can be run on ASCII systems to
204        check some of the EBCDIC-related things (but is it not a full test).
206    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
207        in a small tidy to the code.
209    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
211    18. If the --only-matching (-o) option in pcregrep is specified multiple
212        times, each one causes appropriate output. For example, -o1 -o2 outputs the
213        substrings matched by the 1st and 2nd capturing parentheses. A separating
214        string can be specified by --om-separator (default empty).
216    19. Improving the first n character searches.
218    20. Turn case lists for horizontal and vertical white space into macros so that
219        they are defined only once.
221    21. This set of changes together give more compatible Unicode case-folding
222        behaviour for characters that have more than one other case when UCP
223        support is available.
225        (a) The Unicode property table now has offsets into a new table of sets of
226            three or more characters that are case-equivalent. The MultiStage2.py
227            script that generates these tables (the pcre_ucd.c file) now scans
228            CaseFolding.txt instead of UnicodeData.txt for character case
229            information.
231        (b) The code for adding characters or ranges of characters to a character
232            class has been abstracted into a generalized function that also handles
233            case-independence. In UTF-mode with UCP support, this uses the new data
234            to handle characters with more than one other case.
236        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
237            whose other case is greater than 256 are now correctly matched
238            caselessly. Previously, the high codepoint matched the low one, but not
239            vice versa.
241        (d) The processing of \h, \H, \v, and \ in character classes now makes use
242            of the new class addition function, using character lists defined as
243            macros alongside the case definitions of 20 above.
245        (e) Caseless back references now work with characters that have more than
246            one other case.
248        (f) General caseless matching of characters with more than one other case
249            is supported.
251    22. Unicode character properties were updated from Unicode 6.2.0
253    23. Improved CMake support under Windows. Patch by Daniel Richard G.
255    24. Add support for 32-bit character strings, and UTF-32
257    25. Major JIT compiler update (code refactoring and bugfixing).
258        Experimental Sparc 32 support is added.
260    26. Applied a modified version of Daniel Richard G's patch to create
261        pcre.h.generic and config.h.generic by "make" instead of in the
262        PrepareRelease script.
264    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
265        pcre_compile.c when checking for a zero character.
267    28. Introducing a native interface for JIT. Through this interface, the compiled
268        machine code can be directly executed. The purpose of this interface is to
269        provide fast pattern matching, so several sanity checks are not performed.
270        However, feature tests are still performed. The new interface provides
271        1.4x speedup compared to the old one.
273    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
274        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
275        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
277    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
278        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
279        the "old" RFC 2279). Instead, it ended up passing a negative length to
280        pcre_exec().
282    31. Add support for GCC's visibility feature to hide internal functions.
284    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
285        "unknown -C option" after outputting 0 or 1.
287    33. There is now support for generating a code coverage report for the test
288        suite in environments where gcc is the compiler and lcov is installed. This
289        is mainly for the benefit of the developers.
291    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
292        unaddressable using valgrind annotations, allowing valgrind to detect
293        invalid memory accesses. This is mainly for the benefit of the developers.
295    25. (*UTF) can now be used to start a pattern in any of the three libraries.
297    26. Give configure error if --enable-cpp but no C++ compiler found.
300    Version 8.31 06-July-2012
301    -------------------------
303    1.  Fixing a wrong JIT test case and some compiler warnings.
305    2.  Removed a bashism from the RunTest script.
307    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
308        to unsigned type, result still unsigned" that was given by an MS compiler
309        on encountering the code "-sizeof(xxx)".
311    4.  Partial matching support is added to the JIT compiler.
313    5.  Fixed several bugs concerned with partial matching of items that consist
314        of more than one character:
316        (a) /^(..)\1/ did not partially match "aba" because checking references was
317            done on an "all or nothing" basis. This also applied to repeated
318            references.
320        (b) \R did not give a hard partial match if \r was found at the end of the
321            subject.
323        (c) \X did not give a hard partial match after matching one or more
324            characters at the end of the subject.
326        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
327            a partial match for the string "\r".
329        (e) When newline was set to CRLF, the metacharacter "." did not recognize
330            a partial match for a CR character at the end of the subject string.
332    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
333        running pcretest, the text "(JIT)" added to the output whenever JIT is
334        actually used to run the match.
336    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
337        or /S+[+] with a digit between 1 and 7.
339    8.  OP_NOT now supports any UTF character not just single-byte ones.
341    9.  (*MARK) control verb is now supported by the JIT compiler.
343    10. The command "./RunTest list" lists the available tests without actually
344        running any of them. (Because I keep forgetting what they all are.)
348    12. Applied a (slightly modified) user-supplied patch that improves performance
349        when the heap is used for recursion (compiled with --disable-stack-for-
350        recursion). Instead of malloc and free for each heap frame each time a
351        logical recursion happens, frames are retained on a chain and re-used where
352        possible. This sometimes gives as much as 30% improvement.
354    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
355        call.
357    14. As documented, (*COMMIT) is now confined to within a positive assertion.
359    15. It is now possible to link pcretest with libedit as an alternative to
360        libreadline.
362    16. (*COMMIT) control verb is now supported by the JIT compiler.
364    17. The Unicode data tables have been updated to Unicode 6.1.0.
366    18. Added --file-list option to pcregrep.
368    19. Added binary file support to pcregrep, including the -a, --binary-files,
369        -I, and --text options.
371    20. The madvise function is renamed for posix_madvise for QNX compatibility
372        reasons. Fixed by Giuseppe D'Angelo.
374    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
376    22. Changed the option for creating symbolic links for 16-bit man pages from
377        -s to -sf so that re-installing does not cause issues.
379    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
381    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
382        matches in certain environments (the workspace was not being correctly
383        retained). Also added to pcre_dfa_exec() a simple plausibility check on
384        some of the workspace data at the beginning of a restart.
386    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
387        was not doing so when it should - probably a typo introduced by SVN 528
388        (change 8.10/14).
390    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
391        \w+ when the character tables indicated that \x{c4} was a word character.
392        There were several related cases, all because the tests for doing a table
393        lookup were testing for characters less than 127 instead of 255.
395    27. If a pattern contains capturing parentheses that are not used in a match,
396        their slots in the ovector are set to -1. For those that are higher than
397        any matched groups, this happens at the end of processing. In the case when
398        there were back references that the ovector was too small to contain
399        (causing temporary malloc'd memory to be used during matching), and the
400        highest capturing number was not used, memory off the end of the ovector
401        was incorrectly being set to -1. (It was using the size of the temporary
402        memory instead of the true size.)
404    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
405        ovector size, it uses memory at the end of the block that it has got.
407    29. Check for an overlong MARK name and give an error at compile time. The
408        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
410    30. JIT compiler update.
412    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
413        Rill for the patch.
415    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
417    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
419    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
420        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
421        was enabled.
423    35. Improve JIT code generation for greedy plus quantifier.
425    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
426        1 to "aa" instead of to an empty string. The bug affected repeated groups
427        that could potentially match an empty string.
429    37. Optimizing single character iterators in JIT.
431    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
432        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
433        codepoints that are too big for the mode are faulted, and in a UTF mode,
434        disallowed codepoints are also faulted.
436    39. If PCRE was compiled with UTF support, in three places in the DFA
437        matcher there was code that should only have been obeyed in UTF mode, but
438        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
439        processing when bytes with values greater than 127 were present. In 16-bit
440        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
441        both cases the values are those that cannot be the first data item in a UTF
442        character. The three items that might have provoked this were recursions,
443        possessively repeated groups, and atomic groups.
445    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
446        and pcregrep, because some OS require shared objects to be explicitly
447        passed to ld, causing the link step to fail if they are not.
449    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
450        mode, patterns that started with \h* or \R* might be incorrectly matched.
453    Version 8.30 04-February-2012
454    -----------------------------
456    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
457        name is defined in ctype.h.
459    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
460        only in quite long subpatterns.
462    3.  Removed the function pcre_info(), which has been obsolete and deprecated
463        since it was replaced by pcre_fullinfo() in February 2000.
465    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
466        match a (*MARK), and the match failed at the start of the subject, a
467        reference to memory before the start of the subject could occur. This bug
468        was introduced by fix 17 of release 8.21.
470    5.  A reference to an unset group with zero minimum repetition was giving
471        totally wrong answers (in non-JavaScript-compatibility mode). For example,
472        /(another)?(\1?)test/ matched against "hello world test". This bug was
473        introduced in release 8.13.
475    6.  Add support for 16-bit character strings (a large amount of work involving
476        many changes and refactorings).
478    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
479        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
480        from a file.
482    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
483        rounding is not applied in this particular case).
485    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
486        if they appear, or are escaped, in patterns.
488    10. Get rid of a number of -Wunused-but-set-variable warnings.
490    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
491        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
492        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
493        also returns the mark "x". This bug applied to capturing parentheses,
494        non-capturing parentheses, and atomic parentheses. It also applied to some
495        assertions.
497    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
498        information out of configure.ac instead of relying on pcre.h.generic, which
499        is not stored in the repository.
501    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
502        -lreadline.
504    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
506    15. Applied Graycode's patch to put the top-level frame on the stack rather
507        than the heap when not using the stack for recursion. This gives a
508        performance improvement in many cases when recursion is not deep.
510    16. Experimental code added to "pcretest -C" to output the stack frame size.
513    Version 8.21 12-Dec-2011
514    ------------------------
516  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
518    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
519        are added as well.
521    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
522        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
523        calling _pcre_jit_exec. Some extra comments are added.
525    4.  (*MARK) settings inside atomic groups that do not contain any capturing
526        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
527        was introduced by change 18 for 8.20.
529    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
530        ECMA-262 standard.
532    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
533        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
534        This bug was probably introduced by change 9 of 8.13.
536    7.  While fixing 6 above, I noticed that a number of other items were being
537        incorrectly rejected as "not fixed length". This arose partly because newer
538        opcodes had not been added to the fixed-length checking code. I have (a)
539        corrected the bug and added tests for these items, and (b) arranged for an
540        error to occur if an unknown opcode is encountered while checking for fixed
541        length instead of just assuming "not fixed length". The items that were
542        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
543        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
544        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
546    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
547        being incorrectly compiled and would have given unpredicatble results.
549    9.  A possessively repeated subpattern with minimum repeat count greater than
550        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
551        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
552        the first (A) could occur when it should not.
554    10. Add a cast and remove a redundant test from the code.
556    11. JIT should use pcre_malloc/pcre_free for allocation.
558    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
559        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
560        is anything other than /usr, -L is still shown).
562    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
564    14. Perl does not support \N without a following name in a [] class; PCRE now
565        also gives an error.
567    15. If a forward reference was repeated with an upper limit of around 2000,
568        it caused the error "internal error: overran compiling workspace". The
569        maximum number of forward references (including repeats) was limited by the
570        internal workspace, and dependent on the LINK_SIZE. The code has been
571        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
572        the default depends on LINK_SIZE. There is a new upper limit (for safety)
573        of around 200,000 forward references. While doing this, I also speeded up
574        the filling in of repeated forward references.
576    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
577        incorrectly expecting the subject to contain another "a" after the start.
579    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
580        in the match, the SKIP should be ignored. This was not happening; instead
581        the SKIP was being treated as NOMATCH. For patterns such as
582        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
583        tested.
585    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
586        now much more compatible with Perl, in particular in cases where the result
587        is a non-match for a non-anchored pattern. For example, if
588        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
589        "m", where previously it did not return a name. A side effect of this
590        change is that for partial matches, the last encountered mark name is
591        returned, as for non matches. A number of tests that were previously not
592        Perl-compatible have been moved into the Perl-compatible test files. The
593        refactoring has had the pleasing side effect of removing one argument from
594        the match() function, thus reducing its stack requirements.
596    19. If the /S+ option was used in pcretest to study a pattern using JIT,
597        subsequent uses of /S (without +) incorrectly behaved like /S+.
599    21. Retrieve executable code size support for the JIT compiler and fixing
600        some warnings.
602    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
603        not work when the shorter character appeared right at the end of the
604        subject string.
606    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
607        systems.
609    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
610        output it when the /M option is used in pcretest.
612    25. The CheckMan script was not being included in the distribution. Also, added
613        an explicit "perl" to run Perl scripts from the PrepareRelease script
614        because this is reportedly needed in Windows.
616    26. If study data was being save in a file and studying had not found a set of
617        "starts with" bytes for the pattern, the data written to the file (though
618        never used) was taken from uninitialized memory and so caused valgrind to
619        complain.
621    27. Updated RunTest.bat as provided by Sheri Pierce.
623    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
625    29. Computation of memory usage for the table of capturing group names was
626        giving an unnecessarily large value.
629  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011
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