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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.21  Version 8.33 xx-xxxx-201x
5  ------------  -------------------------
6    
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.
11    
12    2.  Applied patch by Daniel Richard G for quashing MSVC warnings to the
13        CMake config files.
14    
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.
18    
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.
24    
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.
28    
29    6.  Fix forward search in JIT when link size is 3 or greater. Also removed some
30        unnecessary spaces.
31    
32    7.  Adjust autogen.sh and configure.ac to lose warnings given by automake 1.12
33        and later.
34    
35    8.  Fix two buffer over read issues in 16 and 32 bit modes. Affects JIT only.
36    
37    9.  Optimizing fast_forward_start_bits in JIT.
38    
39    10. Adding experimental support for callouts in JIT, and fixing some
40        issues revealed during this work. Namely:
41    
42        (a) Unoptimized capturing brackets incorrectly reset on backtrack.
43    
44        (b) Minimum length was not checked before the matching is started.
45    
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.
50    
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.
54    
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.
57    
58    14. Inlining subpatterns in recursions, when certain conditions are fulfilled.
59        Only supported by the JIT compiler at the moment.
60    
61    15. JIT compiler now supports 32 bit Macs thanks to Lawrence Velazquez.
62    
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.
66    
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.
73    
74    18. Added some #ifdef __VMS code into pcretest.c to help VMS implementations.
75    
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.
78    
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.
82    
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".
87    
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.
92    
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.
96    
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.
99    
100    25. (*PRUNE) is now supported by the JIT compiler.
101    
102    26. Fix infinite loop when /(?<=(*SKIP)ac)a/ is matched against aa.
103    
104    27. Fix the case where there are two or more SKIPs with arguments that may be
105        ignored.
106    
107    28. (*SKIP) is now supported by the JIT compiler.
108    
109    29. (*THEN) is now supported by the JIT compiler.
110    
111    30. Update RunTest with additional test selector options.
112    
113    31. The way PCRE handles backtracking verbs has been changed in two ways.
114    
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.
119    
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.
123    
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.
127    
128    32. Control verbs are handled in the same way in JIT and interpreter.
129    
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.
132    
133    34. Auto-detect and optimize limited repetitions in JIT.
134    
135    35. Implement PCRE_NEVER_UTF to lock out the use of UTF, in particular,
136        blocking (*UTF) etc.
137    
138    36. In the interpreter, maximizing pattern repetitions for characters and
139        character types now use tail recursion, which reduces stack usage.
140    
141    37. The value of the max lookbehind was not correctly preserved if a compiled
142        and saved regex was reloaded on a host of different endianness.
143    
144    38. Implemented (*LIMIT_MATCH) and (*LIMIT_RECURSION). As part of the extension
145        of the compiled pattern block, expand the flags field from 16 to 32 bits
146        because it was almost full.
147    
148    
149    Version 8.32 30-November-2012
150    -----------------------------
151    
152    1.  Improved JIT compiler optimizations for first character search and single
153        character iterators.
154    
155    2.  Supporting IBM XL C compilers for PPC architectures in the JIT compiler.
156        Patch by Daniel Richard G.
157    
158    3.  Single character iterator optimizations in the JIT compiler.
159    
160    4.  Improved JIT compiler optimizations for character ranges.
161    
162    5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
163        Reported by Giuseppe D'Angelo.
164    
165    6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
166        of a line, was being set incorrectly in cases where .* appeared inside
167        atomic brackets at the start of a pattern, or where there was a subsequent
168        *PRUNE or *SKIP.
169    
170    7.  Improved instruction cache flush for POWER/PowerPC.
171        Patch by Daniel Richard G.
172    
173    8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
174        grep:
175    
176        (a) There is now no limit to the number of patterns to be matched.
177    
178        (b) An error is given if a pattern is too long.
179    
180        (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
181            are now supported.
182    
183        (d) --exclude-from and --include-from (multiple use) have been added.
184    
185        (e) Exclusions and inclusions now apply to all files and directories, not
186            just to those obtained from scanning a directory recursively.
187    
188        (f) Multiple uses of -f and --file-list are now supported.
189    
190        (g) In a Windows environment, the default for -d has been changed from
191            "read" (the GNU grep default) to "skip", because otherwise the presence
192            of a directory in the file list provokes an error.
193    
194        (h) The documentation has been revised and clarified in places.
195    
196    9.  Improve the matching speed of capturing brackets.
197    
198    10. Changed the meaning of \X so that it now matches a Unicode extended
199        grapheme cluster.
200    
201    11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
202        out POSIX threads when JIT support is configured.
203    
204    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
205    
206    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
207        structure could go wrong in environments where size_t is not the same size
208        as int.
209    
210    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
211        set.
212    
213    15. The EBCDIC support had decayed; later updates to the code had included
214        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
215        general tidy up of EBCDIC-related issues, and the documentation was also
216        not quite right. There is now a test that can be run on ASCII systems to
217        check some of the EBCDIC-related things (but is it not a full test).
218    
219    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
220        in a small tidy to the code.
221    
222    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
223    
224    18. If the --only-matching (-o) option in pcregrep is specified multiple
225        times, each one causes appropriate output. For example, -o1 -o2 outputs the
226        substrings matched by the 1st and 2nd capturing parentheses. A separating
227        string can be specified by --om-separator (default empty).
228    
229    19. Improving the first n character searches.
230    
231    20. Turn case lists for horizontal and vertical white space into macros so that
232        they are defined only once.
233    
234    21. This set of changes together give more compatible Unicode case-folding
235        behaviour for characters that have more than one other case when UCP
236        support is available.
237    
238        (a) The Unicode property table now has offsets into a new table of sets of
239            three or more characters that are case-equivalent. The MultiStage2.py
240            script that generates these tables (the pcre_ucd.c file) now scans
241            CaseFolding.txt instead of UnicodeData.txt for character case
242            information.
243    
244        (b) The code for adding characters or ranges of characters to a character
245            class has been abstracted into a generalized function that also handles
246            case-independence. In UTF-mode with UCP support, this uses the new data
247            to handle characters with more than one other case.
248    
249        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
250            whose other case is greater than 256 are now correctly matched
251            caselessly. Previously, the high codepoint matched the low one, but not
252            vice versa.
253    
254        (d) The processing of \h, \H, \v, and \ in character classes now makes use
255            of the new class addition function, using character lists defined as
256            macros alongside the case definitions of 20 above.
257    
258        (e) Caseless back references now work with characters that have more than
259            one other case.
260    
261        (f) General caseless matching of characters with more than one other case
262            is supported.
263    
264    22. Unicode character properties were updated from Unicode 6.2.0
265    
266    23. Improved CMake support under Windows. Patch by Daniel Richard G.
267    
268    24. Add support for 32-bit character strings, and UTF-32
269    
270    25. Major JIT compiler update (code refactoring and bugfixing).
271        Experimental Sparc 32 support is added.
272    
273    26. Applied a modified version of Daniel Richard G's patch to create
274        pcre.h.generic and config.h.generic by "make" instead of in the
275        PrepareRelease script.
276    
277    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
278        pcre_compile.c when checking for a zero character.
279    
280    28. Introducing a native interface for JIT. Through this interface, the compiled
281        machine code can be directly executed. The purpose of this interface is to
282        provide fast pattern matching, so several sanity checks are not performed.
283        However, feature tests are still performed. The new interface provides
284        1.4x speedup compared to the old one.
285    
286    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
287        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
288        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
289    
290    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
291        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
292        the "old" RFC 2279). Instead, it ended up passing a negative length to
293        pcre_exec().
294    
295    31. Add support for GCC's visibility feature to hide internal functions.
296    
297    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
298        "unknown -C option" after outputting 0 or 1.
299    
300    33. There is now support for generating a code coverage report for the test
301        suite in environments where gcc is the compiler and lcov is installed. This
302        is mainly for the benefit of the developers.
303    
304    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
305        unaddressable using valgrind annotations, allowing valgrind to detect
306        invalid memory accesses. This is mainly for the benefit of the developers.
307    
308    25. (*UTF) can now be used to start a pattern in any of the three libraries.
309    
310    26. Give configure error if --enable-cpp but no C++ compiler found.
311    
312    
313    Version 8.31 06-July-2012
314    -------------------------
315    
316    1.  Fixing a wrong JIT test case and some compiler warnings.
317    
318    2.  Removed a bashism from the RunTest script.
319    
320    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
321        to unsigned type, result still unsigned" that was given by an MS compiler
322        on encountering the code "-sizeof(xxx)".
323    
324    4.  Partial matching support is added to the JIT compiler.
325    
326    5.  Fixed several bugs concerned with partial matching of items that consist
327        of more than one character:
328    
329        (a) /^(..)\1/ did not partially match "aba" because checking references was
330            done on an "all or nothing" basis. This also applied to repeated
331            references.
332    
333        (b) \R did not give a hard partial match if \r was found at the end of the
334            subject.
335    
336        (c) \X did not give a hard partial match after matching one or more
337            characters at the end of the subject.
338    
339        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
340            a partial match for the string "\r".
341    
342        (e) When newline was set to CRLF, the metacharacter "." did not recognize
343            a partial match for a CR character at the end of the subject string.
344    
345    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
346        running pcretest, the text "(JIT)" added to the output whenever JIT is
347        actually used to run the match.
348    
349    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
350        or /S+[+] with a digit between 1 and 7.
351    
352    8.  OP_NOT now supports any UTF character not just single-byte ones.
353    
354    9.  (*MARK) control verb is now supported by the JIT compiler.
355    
356    10. The command "./RunTest list" lists the available tests without actually
357        running any of them. (Because I keep forgetting what they all are.)
358    
359    11. Add PCRE_INFO_MAXLOOKBEHIND.
360    
361    12. Applied a (slightly modified) user-supplied patch that improves performance
362        when the heap is used for recursion (compiled with --disable-stack-for-
363        recursion). Instead of malloc and free for each heap frame each time a
364        logical recursion happens, frames are retained on a chain and re-used where
365        possible. This sometimes gives as much as 30% improvement.
366    
367    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
368        call.
369    
370    14. As documented, (*COMMIT) is now confined to within a positive assertion.
371    
372    15. It is now possible to link pcretest with libedit as an alternative to
373        libreadline.
374    
375    16. (*COMMIT) control verb is now supported by the JIT compiler.
376    
377    17. The Unicode data tables have been updated to Unicode 6.1.0.
378    
379    18. Added --file-list option to pcregrep.
380    
381    19. Added binary file support to pcregrep, including the -a, --binary-files,
382        -I, and --text options.
383    
384    20. The madvise function is renamed for posix_madvise for QNX compatibility
385        reasons. Fixed by Giuseppe D'Angelo.
386    
387    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
388    
389    22. Changed the option for creating symbolic links for 16-bit man pages from
390        -s to -sf so that re-installing does not cause issues.
391    
392    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
393    
394    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
395        matches in certain environments (the workspace was not being correctly
396        retained). Also added to pcre_dfa_exec() a simple plausibility check on
397        some of the workspace data at the beginning of a restart.
398    
399    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
400        was not doing so when it should - probably a typo introduced by SVN 528
401        (change 8.10/14).
402    
403    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
404        \w+ when the character tables indicated that \x{c4} was a word character.
405        There were several related cases, all because the tests for doing a table
406        lookup were testing for characters less than 127 instead of 255.
407    
408    27. If a pattern contains capturing parentheses that are not used in a match,
409        their slots in the ovector are set to -1. For those that are higher than
410        any matched groups, this happens at the end of processing. In the case when
411        there were back references that the ovector was too small to contain
412        (causing temporary malloc'd memory to be used during matching), and the
413        highest capturing number was not used, memory off the end of the ovector
414        was incorrectly being set to -1. (It was using the size of the temporary
415        memory instead of the true size.)
416    
417    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
418        ovector size, it uses memory at the end of the block that it has got.
419    
420    29. Check for an overlong MARK name and give an error at compile time. The
421        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
422    
423    30. JIT compiler update.
424    
425    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
426        Rill for the patch.
427    
428    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
429    
430    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
431    
432    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
433        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
434        was enabled.
435    
436    35. Improve JIT code generation for greedy plus quantifier.
437    
438    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
439        1 to "aa" instead of to an empty string. The bug affected repeated groups
440        that could potentially match an empty string.
441    
442    37. Optimizing single character iterators in JIT.
443    
444    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
445        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
446        codepoints that are too big for the mode are faulted, and in a UTF mode,
447        disallowed codepoints are also faulted.
448    
449    39. If PCRE was compiled with UTF support, in three places in the DFA
450        matcher there was code that should only have been obeyed in UTF mode, but
451        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
452        processing when bytes with values greater than 127 were present. In 16-bit
453        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
454        both cases the values are those that cannot be the first data item in a UTF
455        character. The three items that might have provoked this were recursions,
456        possessively repeated groups, and atomic groups.
457    
458    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
459        and pcregrep, because some OS require shared objects to be explicitly
460        passed to ld, causing the link step to fail if they are not.
461    
462    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
463        mode, patterns that started with \h* or \R* might be incorrectly matched.
464    
465    
466    Version 8.30 04-February-2012
467    -----------------------------
468    
469    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
470        name is defined in ctype.h.
471    
472    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
473        only in quite long subpatterns.
474    
475    3.  Removed the function pcre_info(), which has been obsolete and deprecated
476        since it was replaced by pcre_fullinfo() in February 2000.
477    
478    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
479        match a (*MARK), and the match failed at the start of the subject, a
480        reference to memory before the start of the subject could occur. This bug
481        was introduced by fix 17 of release 8.21.
482    
483    5.  A reference to an unset group with zero minimum repetition was giving
484        totally wrong answers (in non-JavaScript-compatibility mode). For example,
485        /(another)?(\1?)test/ matched against "hello world test". This bug was
486        introduced in release 8.13.
487    
488    6.  Add support for 16-bit character strings (a large amount of work involving
489        many changes and refactorings).
490    
491    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
492        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
493        from a file.
494    
495    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
496        rounding is not applied in this particular case).
497    
498    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
499        if they appear, or are escaped, in patterns.
500    
501    10. Get rid of a number of -Wunused-but-set-variable warnings.
502    
503    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
504        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
505        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
506        also returns the mark "x". This bug applied to capturing parentheses,
507        non-capturing parentheses, and atomic parentheses. It also applied to some
508        assertions.
509    
510    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
511        information out of configure.ac instead of relying on pcre.h.generic, which
512        is not stored in the repository.
513    
514    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
515        -lreadline.
516    
517    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
518    
519    15. Applied Graycode's patch to put the top-level frame on the stack rather
520        than the heap when not using the stack for recursion. This gives a
521        performance improvement in many cases when recursion is not deep.
522    
523    16. Experimental code added to "pcretest -C" to output the stack frame size.
524    
525    
526    Version 8.21 12-Dec-2011
527    ------------------------
528    
529  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
530    
# Line 13  Version 8.21 Line 535  Version 8.21
535      PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before      PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
536      calling _pcre_jit_exec. Some extra comments are added.      calling _pcre_jit_exec. Some extra comments are added.
537    
538  4.  Mark settings inside atomic groups that do not contain any capturing  4.  (*MARK) settings inside atomic groups that do not contain any capturing
539      parentheses, for example, (?>a(*:m)), were not being passed out. This bug      parentheses, for example, (?>a(*:m)), were not being passed out. This bug
540      was introduced by change 18 for 8.20.      was introduced by change 18 for 8.20.
541    
# Line 22  Version 8.21 Line 544  Version 8.21
544    
545  6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were  6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
546      erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.      erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
547      This bug was probably introduced by change 9 of 8.13.      This bug was probably introduced by change 9 of 8.13.
548    
549  7.  While fixing 6 above, I noticed that a number of other items were being  7.  While fixing 6 above, I noticed that a number of other items were being
550      incorrectly rejected as "not fixed length". This arose partly because newer      incorrectly rejected as "not fixed length". This arose partly because newer
551      opcodes had not been added to the fixed-length checking code. I have (a)      opcodes had not been added to the fixed-length checking code. I have (a)
552      corrected the bug and added tests for these items, and (b) arranged for an      corrected the bug and added tests for these items, and (b) arranged for an
553      error to occur if an unknown opcode is encountered while checking for fixed      error to occur if an unknown opcode is encountered while checking for fixed
554      length instead of just assuming "not fixed length". The items that were      length instead of just assuming "not fixed length". The items that were
555      rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),      rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
556      (*THEN), \h, \H, \v, \V, and single character negative classes with fixed      (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
557      repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.      repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
558    
559  8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was  8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
560      being incorrectly compiled and would have given unpredicatble results.      being incorrectly compiled and would have given unpredicatble results.
561    
562  9.  A possessively repeated subpattern with minimum repeat count greater than  9.  A possessively repeated subpattern with minimum repeat count greater than
563      one behaved incorrectly. For example, (A){2,}+ behaved as if it was      one behaved incorrectly. For example, (A){2,}+ behaved as if it was
564      (A)(A)++ which meant that, after a subsequent mismatch, backtracking into      (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
565      the first (A) could occur when it should not.      the first (A) could occur when it should not.
566    
567  10. Add a cast and remove a redundant test from the code.  10. Add a cast and remove a redundant test from the code.
568    
569  11. JIT should use pcre_malloc/pcre_free for allocation.  11. JIT should use pcre_malloc/pcre_free for allocation.
570    
571  12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems  12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
572      best practice nowadays, and helps with cross-compiling. (If the exec_prefix      best practice nowadays, and helps with cross-compiling. (If the exec_prefix
573      is anything other than /usr, -L is still shown).      is anything other than /usr, -L is still shown).
574    
575  13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.  13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
576    
577  14. Perl does not support \N without a following name in a [] class; PCRE now  14. Perl does not support \N without a following name in a [] class; PCRE now
578      also gives an error.      also gives an error.
579    
580  15. If a forward reference was repeated with an upper limit of around 2000,  15. If a forward reference was repeated with an upper limit of around 2000,
581      it caused the error "internal error: overran compiling workspace". The      it caused the error "internal error: overran compiling workspace". The
582      maximum number of forward references (including repeats) was limited by the      maximum number of forward references (including repeats) was limited by the
583      internal workspace, and dependent on the LINK_SIZE. The code has been      internal workspace, and dependent on the LINK_SIZE. The code has been
584      rewritten so that the workspace expands (via pcre_malloc) if necessary, and      rewritten so that the workspace expands (via pcre_malloc) if necessary, and
585      the default depends on LINK_SIZE. There is a new upper limit (for safety)      the default depends on LINK_SIZE. There is a new upper limit (for safety)
586      of around 200,000 forward references. While doing this, I also speeded up      of around 200,000 forward references. While doing this, I also speeded up
587      the filling in of repeated forward references.      the filling in of repeated forward references.
588    
589  16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was  16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
590      incorrectly expecting the subject to contain another "a" after the start.      incorrectly expecting the subject to contain another "a" after the start.
591    
592  17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier  17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
593      in the match, the SKIP should be ignored. This was not happening; instead      in the match, the SKIP should be ignored. This was not happening; instead
594      the SKIP was being treated as NOMATCH. For patterns such as      the SKIP was being treated as NOMATCH. For patterns such as
595      /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never      /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
596      tested.      tested.
597    
598  18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is  18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
599      now much more compatible with Perl, in particular in cases where the result      now much more compatible with Perl, in particular in cases where the result
600      is a non-match for a non-anchored pattern. For example, if      is a non-match for a non-anchored pattern. For example, if
601      /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name      /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
602      "m", where previously it did not return a name. A side effect of this      "m", where previously it did not return a name. A side effect of this
603      change is that for partial matches, the last encountered mark name is      change is that for partial matches, the last encountered mark name is
604      returned, as for non matches. A number of tests that were previously not      returned, as for non matches. A number of tests that were previously not
605      Perl-compatible have been moved into the Perl-compatible test files. The      Perl-compatible have been moved into the Perl-compatible test files. The
606      refactoring has had the pleasing side effect of removing one argument from      refactoring has had the pleasing side effect of removing one argument from
607      the match() function, thus reducing its stack requirements.      the match() function, thus reducing its stack requirements.
608    
609  19. If the /S+ option was used in pcretest to study a pattern using JIT,  19. If the /S+ option was used in pcretest to study a pattern using JIT,
610      subsequent uses of /S (without +) incorrectly behaved like /S+.      subsequent uses of /S (without +) incorrectly behaved like /S+.
611    
612  21. Retrieve executable code size support for the JIT compiler and fixing  21. Retrieve executable code size support for the JIT compiler and fixing
613      some warnings.      some warnings.
614    
615  22. A caseless match of a UTF-8 character whose other case uses fewer bytes did  22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
616      not work when the shorter character appeared right at the end of the      not work when the shorter character appeared right at the end of the
617      subject string.      subject string.
618    
619  23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit  23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
620      systems.      systems.
621    
622  24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also  24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
623      output it when the /M option is used in pcretest.      output it when the /M option is used in pcretest.
624    
625    25. The CheckMan script was not being included in the distribution. Also, added
626        an explicit "perl" to run Perl scripts from the PrepareRelease script
627        because this is reportedly needed in Windows.
628    
629    26. If study data was being save in a file and studying had not found a set of
630        "starts with" bytes for the pattern, the data written to the file (though
631        never used) was taken from uninitialized memory and so caused valgrind to
632        complain.
633    
634    27. Updated RunTest.bat as provided by Sheri Pierce.
635    
636    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
637    
638    29. Computation of memory usage for the table of capturing group names was
639        giving an unnecessarily large value.
640    
641    
642  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011

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