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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 8.21  Version 8.35-RC1 xx-xxxx-201x
5  ------------  -----------------------------
7    1.  A new flag is set, when property checks are present in an XCLASS.
8        When this flag is not set, PCRE can perform certain optimizations
9        such as studying these XCLASS-es.
11    2.  The auto-possessification of character sets were improved: a normal
12        and an extended character set can be compared now. Furthermore
13        the JIT compiler optimizes more character set checks.
15    3.  Got rid of some compiler warnings for potentially uninitialized variables
16        that show up only when compiled with -O2.
18    4.  A pattern such as (?=ab\K) that uses \K in an assertion can set the start
19        of a match later then the end of the match. The pcretest program was not
20        handling the case sensibly - it was outputting from the start to the next
21        binary zero. It now reports this situation in a message, and outputs the
22        text from the end to the start.
24    5.  Fast forward search is improved in JIT. Instead of the first three
25        characters, any three characters with fixed position can be searched.
26        Search order: first, last, middle.
28    6.  Improve character range checks in JIT. Characters are read by an inprecise
29        function now, which returns with an unknown value if the character code is
30        above a certain treshold (e.g: 256). The only limitation is that the value
31        must be bigger than the treshold as well. This function is useful, when
32        the characters above the treshold are handled in the same way.
34    7.  The macros whose names start with RAWUCHAR are placeholders for a future
35        mode in which only the bottom 21 bits of 32-bit data items are used. To
36        make this more memorable for those maintaining the code, the names have
37        been changed to start with UCHAR21, and an extensive comment has been added
38        to their definition.
41    Version 8.34 15-December-2013
42    -----------------------------
44    1.  Add pcre[16|32]_jit_free_unused_memory to forcibly free unused JIT
45        executable memory. Patch inspired by Carsten Klein.
47    2.  ./configure --enable-coverage defined SUPPORT_GCOV in config.h, although
48        this macro is never tested and has no effect, because the work to support
49        coverage involves only compiling and linking options and special targets in
50        the Makefile. The comment in config.h implied that defining the macro would
51        enable coverage support, which is totally false. There was also support for
52        setting this macro in the CMake files (my fault, I just copied it from
53        configure). SUPPORT_GCOV has now been removed.
55    3.  Make a small performance improvement in strlen16() and strlen32() in
56        pcretest.
58    4.  Change 36 for 8.33 left some unreachable statements in pcre_exec.c,
59        detected by the Solaris compiler (gcc doesn't seem to be able to diagnose
60        these cases). There was also one in pcretest.c.
62    5.  Cleaned up a "may be uninitialized" compiler warning in pcre_exec.c.
64    6.  In UTF mode, the code for checking whether a group could match an empty
65        string (which is used for indefinitely repeated groups to allow for
66        breaking an infinite loop) was broken when the group contained a repeated
67        negated single-character class with a character that occupied more than one
68        data item and had a minimum repetition of zero (for example, [^\x{100}]* in
69        UTF-8 mode). The effect was undefined: the group might or might not be
70        deemed as matching an empty string, or the program might have crashed.
72    7.  The code for checking whether a group could match an empty string was not
73        recognizing that \h, \H, \v, \V, and \R must match a character.
75    8.  Implemented PCRE_INFO_MATCH_EMPTY, which yields 1 if the pattern can match
76        an empty string. If it can, pcretest shows this in its information output.
78    9.  Fixed two related bugs that applied to Unicode extended grapheme clusters
79        that were repeated with a maximizing qualifier (e.g. \X* or \X{2,5}) when
80        matched by pcre_exec() without using JIT:
82        (a) If the rest of the pattern did not match after a maximal run of
83            grapheme clusters, the code for backing up to try with fewer of them
84            did not always back up over a full grapheme when characters that do not
85            have the modifier quality were involved, e.g. Hangul syllables.
87        (b) If the match point in a subject started with modifier character, and
88            there was no match, the code could incorrectly back up beyond the match
89            point, and potentially beyond the first character in the subject,
90            leading to a segfault or an incorrect match result.
92    10. A conditional group with an assertion condition could lead to PCRE
93        recording an incorrect first data item for a match if no other first data
94        item was recorded. For example, the pattern (?(?=ab)ab) recorded "a" as a
95        first data item, and therefore matched "ca" after "c" instead of at the
96        start.
98    11. Change 40 for 8.33 (allowing pcregrep to find empty strings) showed up a
99        bug that caused the command "echo a | ./pcregrep -M '|a'" to loop.
101    12. The source of pcregrep now includes z/OS-specific code so that it can be
102        compiled for z/OS as part of the special z/OS distribution.
104    13. Added the -T and -TM options to pcretest.
106    14. The code in pcre_compile.c for creating the table of named capturing groups
107        has been refactored. Instead of creating the table dynamically during the
108        actual compiling pass, the information is remembered during the pre-compile
109        pass (on the stack unless there are more than 20 named groups, in which
110        case malloc() is used) and the whole table is created before the actual
111        compile happens. This has simplified the code (it is now nearly 150 lines
112        shorter) and prepared the way for better handling of references to groups
113        with duplicate names.
115    15. A back reference to a named subpattern when there is more than one of the
116        same name now checks them in the order in which they appear in the pattern.
117        The first one that is set is used for the reference. Previously only the
118        first one was inspected. This change makes PCRE more compatible with Perl.
120    16. Unicode character properties were updated from Unicode 6.3.0.
122    17. The compile-time code for auto-possessification has been refactored, based
123        on a patch by Zoltan Herczeg. It now happens after instead of during
124        compilation. The code is cleaner, and more cases are handled. The option
125        PCRE_NO_AUTO_POSSESS is added for testing purposes, and the -O and /O
126        options in pcretest are provided to set it. It can also be set by
127        (*NO_AUTO_POSSESS) at the start of a pattern.
129    18. The character VT has been added to the default ("C" locale) set of
130        characters that match \s and are generally treated as white space,
131        following this same change in Perl 5.18. There is now no difference between
132        "Perl space" and "POSIX space". Whether VT is treated as white space in
133        other locales depends on the locale.
135    19. The code for checking named groups as conditions, either for being set or
136        for being recursed, has been refactored (this is related to 14 and 15
137        above). Processing unduplicated named groups should now be as fast at
138        numerical groups, and processing duplicated groups should be faster than
139        before.
141    20. Two patches to the CMake build system, by Alexander Barkov:
143          (1) Replace the "source" command by "." in CMakeLists.txt because
144              "source" is a bash-ism.
146          (2) Add missing HAVE_STDINT_H and HAVE_INTTYPES_H to config-cmake.h.in;
147              without these the CMake build does not work on Solaris.
149    21. Perl has changed its handling of \8 and \9. If there is no previously
150        encountered capturing group of those numbers, they are treated as the
151        literal characters 8 and 9 instead of a binary zero followed by the
152        literals. PCRE now does the same.
154    22. Following Perl, added \o{} to specify codepoints in octal, making it
155        possible to specify values greater than 0777 and also making them
156        unambiguous.
158    23. Perl now gives an error for missing closing braces after \x{... instead of
159        treating the string as literal. PCRE now does the same.
161    24. RunTest used to grumble if an inappropriate test was selected explicitly,
162        but just skip it when running all tests. This make it awkward to run ranges
163        of tests when one of them was inappropriate. Now it just skips any
164        inappropriate tests, as it always did when running all tests.
166    25. If PCRE_AUTO_CALLOUT and PCRE_UCP were set for a pattern that contained
167        character types such as \d or \w, too many callouts were inserted, and the
168        data that they returned was rubbish.
170    26. In UCP mode, \s was not matching two of the characters that Perl matches,
171        namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they
172        were matched by \h. The code has now been refactored so that the lists of
173        the horizontal and vertical whitespace characters used for \h and \v (which
174        are defined only in one place) are now also used for \s.
176    27. Add JIT support for the 64 bit TileGX architecture.
177        Patch by Jiong Wang (Tilera Corporation).
179    28. Possessive quantifiers for classes (both explicit and automatically
180        generated) now use special opcodes instead of wrapping in ONCE brackets.
182    29. Whereas an item such as A{4}+ ignored the possessivenes of the quantifier
183        (because it's meaningless), this was not happening when PCRE_CASELESS was
184        set. Not wrong, but inefficient.
186    30. Updated perltest.pl to add /u (force Unicode mode) when /W (use Unicode
187        properties for \w, \d, etc) is present in a test regex. Otherwise if the
188        test contains no characters greater than 255, Perl doesn't realise it
189        should be using Unicode semantics.
191    31. Upgraded the handling of the POSIX classes [:graph:], [:print:], and
192        [:punct:] when PCRE_UCP is set so as to include the same characters as Perl
193        does in Unicode mode.
195    32. Added the "forbid" facility to pcretest so that putting tests into the
196        wrong test files can sometimes be quickly detected.
198    33. There is now a limit (default 250) on the depth of nesting of parentheses.
199        This limit is imposed to control the amount of system stack used at compile
200        time. It can be changed at build time by --with-parens-nest-limit=xxx or
201        the equivalent in CMake.
203    34. Character classes such as [A-\d] or [a-[:digit:]] now cause compile-time
204        errors. Perl warns for these when in warning mode, but PCRE has no facility
205        for giving warnings.
207    35. Change 34 for 8.13 allowed quantifiers on assertions, because Perl does.
208        However, this was not working for (?!) because it is optimized to (*FAIL),
209        for which PCRE does not allow quantifiers. The optimization is now disabled
210        when a quantifier follows (?!). I can't see any use for this, but it makes
211        things uniform.
213    36. Perl no longer allows group names to start with digits, so I have made this
214        change also in PCRE. It simplifies the code a bit.
216    37. In extended mode, Perl ignores spaces before a + that indicates a
217        possessive quantifier. PCRE allowed a space before the quantifier, but not
218        before the possessive +. It now does.
220    38. The use of \K (reset reported match start) within a repeated possessive
221        group such as (a\Kb)*+ was not working.
223    40. Document that the same character tables must be used at compile time and
224        run time, and that the facility to pass tables to pcre_exec() and
225        pcre_dfa_exec() is for use only with saved/restored patterns.
227    41. Applied Jeff Trawick's patch CMakeLists.txt, which "provides two new
228        features for Builds with MSVC:
230        1. Support pcre.rc and/or pcreposix.rc (as is already done for MinGW
231           builds). The .rc files can be used to set FileDescription and many other
232           attributes.
234        2. Add an option (-DINSTALL_MSVC_PDB) to enable installation of .pdb files.
235           This allows higher-level build scripts which want .pdb files to avoid
236           hard-coding the exact files needed."
238    42. Added support for [[:<:]] and [[:>:]] as used in the BSD POSIX library to
239        mean "start of word" and "end of word", respectively, as a transition aid.
241    43. A minimizing repeat of a class containing codepoints greater than 255 in
242        non-UTF 16-bit or 32-bit modes caused an internal error when PCRE was
243        compiled to use the heap for recursion.
245    44. Got rid of some compiler warnings for unused variables when UTF but not UCP
246        is configured.
249    Version 8.33 28-May-2013
250    ------------------------
252    1.  Added 'U' to some constants that are compared to unsigned integers, to
253        avoid compiler signed/unsigned warnings. Added (int) casts to unsigned
254        variables that are added to signed variables, to ensure the result is
255        signed and can be negated.
257    2.  Applied patch by Daniel Richard G for quashing MSVC warnings to the
258        CMake config files.
260    3.  Revise the creation of config.h.generic so that all boolean macros are
261        #undefined, whereas non-boolean macros are #ifndef/#endif-ed. This makes
262        overriding via -D on the command line possible.
264    4.  Changing the definition of the variable "op" in pcre_exec.c from pcre_uchar
265        to unsigned int is reported to make a quite noticeable speed difference in
266        a specific Windows environment. Testing on Linux did also appear to show
267        some benefit (and it is clearly not harmful). Also fixed the definition of
268        Xop which should be unsigned.
270    5.  Related to (4), changing the definition of the intermediate variable cc
271        in repeated character loops from pcre_uchar to pcre_uint32 also gave speed
272        improvements.
274    6.  Fix forward search in JIT when link size is 3 or greater. Also removed some
275        unnecessary spaces.
277    7.  Adjust autogen.sh and configure.ac to lose warnings given by automake 1.12
278        and later.
280    8.  Fix two buffer over read issues in 16 and 32 bit modes. Affects JIT only.
282    9.  Optimizing fast_forward_start_bits in JIT.
284    10. Adding support for callouts in JIT, and fixing some issues revealed
285        during this work. Namely:
287        (a) Unoptimized capturing brackets incorrectly reset on backtrack.
289        (b) Minimum length was not checked before the matching is started.
291    11. The value of capture_last that is passed to callouts was incorrect in some
292        cases when there was a capture on one path that was subsequently abandoned
293        after a backtrack. Also, the capture_last value is now reset after a
294        recursion, since all captures are also reset in this case.
296    12. The interpreter no longer returns the "too many substrings" error in the
297        case when an overflowing capture is in a branch that is subsequently
298        abandoned after a backtrack.
300    13. In the pathological case when an offset vector of size 2 is used, pcretest
301        now prints out the matched string after a yield of 0 or 1.
303    14. Inlining subpatterns in recursions, when certain conditions are fulfilled.
304        Only supported by the JIT compiler at the moment.
306    15. JIT compiler now supports 32 bit Macs thanks to Lawrence Velazquez.
308    16. Partial matches now set offsets[2] to the "bumpalong" value, that is, the
309        offset of the starting point of the matching process, provided the offsets
310        vector is large enough.
312    17. The \A escape now records a lookbehind value of 1, though its execution
313        does not actually inspect the previous character. This is to ensure that,
314        in partial multi-segment matching, at least one character from the old
315        segment is retained when a new segment is processed. Otherwise, if there
316        are no lookbehinds in the pattern, \A might match incorrectly at the start
317        of a new segment.
319    18. Added some #ifdef __VMS code into pcretest.c to help VMS implementations.
321    19. Redefined some pcre_uchar variables in pcre_exec.c as pcre_uint32; this
322        gives some modest performance improvement in 8-bit mode.
324    20. Added the PCRE-specific property \p{Xuc} for matching characters that can
325        be expressed in certain programming languages using Universal Character
326        Names.
328    21. Unicode validation has been updated in the light of Unicode Corrigendum #9,
329        which points out that "non characters" are not "characters that may not
330        appear in Unicode strings" but rather "characters that are reserved for
331        internal use and have only local meaning".
333    22. When a pattern was compiled with automatic callouts (PCRE_AUTO_CALLOUT) and
334        there was a conditional group that depended on an assertion, if the
335        assertion was false, the callout that immediately followed the alternation
336        in the condition was skipped when pcre_exec() was used for matching.
338    23. Allow an explicit callout to be inserted before an assertion that is the
339        condition for a conditional group, for compatibility with automatic
340        callouts, which always insert a callout at this point.
342    24. In 8.31, (*COMMIT) was confined to within a recursive subpattern. Perl also
343        confines (*SKIP) and (*PRUNE) in the same way, and this has now been done.
345    25. (*PRUNE) is now supported by the JIT compiler.
347    26. Fix infinite loop when /(?<=(*SKIP)ac)a/ is matched against aa.
349    27. Fix the case where there are two or more SKIPs with arguments that may be
350        ignored.
352    28. (*SKIP) is now supported by the JIT compiler.
354    29. (*THEN) is now supported by the JIT compiler.
356    30. Update RunTest with additional test selector options.
358    31. The way PCRE handles backtracking verbs has been changed in two ways.
360        (1) Previously, in something like (*COMMIT)(*SKIP), COMMIT would override
361        SKIP. Now, PCRE acts on whichever backtracking verb is reached first by
362        backtracking. In some cases this makes it more Perl-compatible, but Perl's
363        rather obscure rules do not always do the same thing.
365        (2) Previously, backtracking verbs were confined within assertions. This is
366        no longer the case for positive assertions, except for (*ACCEPT). Again,
367        this sometimes improves Perl compatibility, and sometimes does not.
369    32. A number of tests that were in test 2 because Perl did things differently
370        have been moved to test 1, because either Perl or PCRE has changed, and
371        these tests are now compatible.
373    32. Backtracking control verbs are now handled in the same way in JIT and
374        interpreter.
376    33. An opening parenthesis in a MARK/PRUNE/SKIP/THEN name in a pattern that
377        contained a forward subroutine reference caused a compile error.
379    34. Auto-detect and optimize limited repetitions in JIT.
381    35. Implement PCRE_NEVER_UTF to lock out the use of UTF, in particular,
382        blocking (*UTF) etc.
384    36. In the interpreter, maximizing pattern repetitions for characters and
385        character types now use tail recursion, which reduces stack usage.
387    37. The value of the max lookbehind was not correctly preserved if a compiled
388        and saved regex was reloaded on a host of different endianness.
390    38. Implemented (*LIMIT_MATCH) and (*LIMIT_RECURSION). As part of the extension
391        of the compiled pattern block, expand the flags field from 16 to 32 bits
392        because it was almost full.
394    39. Try madvise first before posix_madvise.
396    40. Change 7 for PCRE 7.9 made it impossible for pcregrep to find empty lines
397        with a pattern such as ^$. It has taken 4 years for anybody to notice! The
398        original change locked out all matches of empty strings. This has been
399        changed so that one match of an empty string per line is recognized.
400        Subsequent searches on the same line (for colouring or for --only-matching,
401        for example) do not recognize empty strings.
403    41. Applied a user patch to fix a number of spelling mistakes in comments.
405    42. Data lines longer than 65536 caused pcretest to crash.
407    43. Clarified the data type for length and startoffset arguments for pcre_exec
408        and pcre_dfa_exec in the function-specific man pages, where they were
409        explicitly stated to be in bytes, never having been updated. I also added
410        some clarification to the pcreapi man page.
412    44. A call to pcre_dfa_exec() with an output vector size less than 2 caused
413        a segmentation fault.
416    Version 8.32 30-November-2012
417    -----------------------------
419    1.  Improved JIT compiler optimizations for first character search and single
420        character iterators.
422    2.  Supporting IBM XL C compilers for PPC architectures in the JIT compiler.
423        Patch by Daniel Richard G.
425    3.  Single character iterator optimizations in the JIT compiler.
427    4.  Improved JIT compiler optimizations for character ranges.
429    5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
430        Reported by Giuseppe D'Angelo.
432    6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
433        of a line, was being set incorrectly in cases where .* appeared inside
434        atomic brackets at the start of a pattern, or where there was a subsequent
435        *PRUNE or *SKIP.
437    7.  Improved instruction cache flush for POWER/PowerPC.
438        Patch by Daniel Richard G.
440    8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
441        grep:
443        (a) There is now no limit to the number of patterns to be matched.
445        (b) An error is given if a pattern is too long.
447        (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
448            are now supported.
450        (d) --exclude-from and --include-from (multiple use) have been added.
452        (e) Exclusions and inclusions now apply to all files and directories, not
453            just to those obtained from scanning a directory recursively.
455        (f) Multiple uses of -f and --file-list are now supported.
457        (g) In a Windows environment, the default for -d has been changed from
458            "read" (the GNU grep default) to "skip", because otherwise the presence
459            of a directory in the file list provokes an error.
461        (h) The documentation has been revised and clarified in places.
463    9.  Improve the matching speed of capturing brackets.
465    10. Changed the meaning of \X so that it now matches a Unicode extended
466        grapheme cluster.
468    11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
469        out POSIX threads when JIT support is configured.
471    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
473    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
474        structure could go wrong in environments where size_t is not the same size
475        as int.
477    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
478        set.
480    15. The EBCDIC support had decayed; later updates to the code had included
481        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
482        general tidy up of EBCDIC-related issues, and the documentation was also
483        not quite right. There is now a test that can be run on ASCII systems to
484        check some of the EBCDIC-related things (but is it not a full test).
486    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
487        in a small tidy to the code.
489    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
491    18. If the --only-matching (-o) option in pcregrep is specified multiple
492        times, each one causes appropriate output. For example, -o1 -o2 outputs the
493        substrings matched by the 1st and 2nd capturing parentheses. A separating
494        string can be specified by --om-separator (default empty).
496    19. Improving the first n character searches.
498    20. Turn case lists for horizontal and vertical white space into macros so that
499        they are defined only once.
501    21. This set of changes together give more compatible Unicode case-folding
502        behaviour for characters that have more than one other case when UCP
503        support is available.
505        (a) The Unicode property table now has offsets into a new table of sets of
506            three or more characters that are case-equivalent. The MultiStage2.py
507            script that generates these tables (the pcre_ucd.c file) now scans
508            CaseFolding.txt instead of UnicodeData.txt for character case
509            information.
511        (b) The code for adding characters or ranges of characters to a character
512            class has been abstracted into a generalized function that also handles
513            case-independence. In UTF-mode with UCP support, this uses the new data
514            to handle characters with more than one other case.
516        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
517            whose other case is greater than 256 are now correctly matched
518            caselessly. Previously, the high codepoint matched the low one, but not
519            vice versa.
521        (d) The processing of \h, \H, \v, and \ in character classes now makes use
522            of the new class addition function, using character lists defined as
523            macros alongside the case definitions of 20 above.
525        (e) Caseless back references now work with characters that have more than
526            one other case.
528        (f) General caseless matching of characters with more than one other case
529            is supported.
531    22. Unicode character properties were updated from Unicode 6.2.0
533    23. Improved CMake support under Windows. Patch by Daniel Richard G.
535    24. Add support for 32-bit character strings, and UTF-32
537    25. Major JIT compiler update (code refactoring and bugfixing).
538        Experimental Sparc 32 support is added.
540    26. Applied a modified version of Daniel Richard G's patch to create
541        pcre.h.generic and config.h.generic by "make" instead of in the
542        PrepareRelease script.
544    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
545        pcre_compile.c when checking for a zero character.
547    28. Introducing a native interface for JIT. Through this interface, the compiled
548        machine code can be directly executed. The purpose of this interface is to
549        provide fast pattern matching, so several sanity checks are not performed.
550        However, feature tests are still performed. The new interface provides
551        1.4x speedup compared to the old one.
553    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
554        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
555        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
557    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
558        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
559        the "old" RFC 2279). Instead, it ended up passing a negative length to
560        pcre_exec().
562    31. Add support for GCC's visibility feature to hide internal functions.
564    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
565        "unknown -C option" after outputting 0 or 1.
567    33. There is now support for generating a code coverage report for the test
568        suite in environments where gcc is the compiler and lcov is installed. This
569        is mainly for the benefit of the developers.
571    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
572        unaddressable using valgrind annotations, allowing valgrind to detect
573        invalid memory accesses. This is mainly for the benefit of the developers.
575    25. (*UTF) can now be used to start a pattern in any of the three libraries.
577    26. Give configure error if --enable-cpp but no C++ compiler found.
580    Version 8.31 06-July-2012
581    -------------------------
583    1.  Fixing a wrong JIT test case and some compiler warnings.
585    2.  Removed a bashism from the RunTest script.
587    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
588        to unsigned type, result still unsigned" that was given by an MS compiler
589        on encountering the code "-sizeof(xxx)".
591    4.  Partial matching support is added to the JIT compiler.
593    5.  Fixed several bugs concerned with partial matching of items that consist
594        of more than one character:
596        (a) /^(..)\1/ did not partially match "aba" because checking references was
597            done on an "all or nothing" basis. This also applied to repeated
598            references.
600        (b) \R did not give a hard partial match if \r was found at the end of the
601            subject.
603        (c) \X did not give a hard partial match after matching one or more
604            characters at the end of the subject.
606        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
607            a partial match for the string "\r".
609        (e) When newline was set to CRLF, the metacharacter "." did not recognize
610            a partial match for a CR character at the end of the subject string.
612    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
613        running pcretest, the text "(JIT)" added to the output whenever JIT is
614        actually used to run the match.
616    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
617        or /S+[+] with a digit between 1 and 7.
619    8.  OP_NOT now supports any UTF character not just single-byte ones.
621    9.  (*MARK) control verb is now supported by the JIT compiler.
623    10. The command "./RunTest list" lists the available tests without actually
624        running any of them. (Because I keep forgetting what they all are.)
628    12. Applied a (slightly modified) user-supplied patch that improves performance
629        when the heap is used for recursion (compiled with --disable-stack-for-
630        recursion). Instead of malloc and free for each heap frame each time a
631        logical recursion happens, frames are retained on a chain and re-used where
632        possible. This sometimes gives as much as 30% improvement.
634    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
635        call.
637    14. As documented, (*COMMIT) is now confined to within a positive assertion.
639    15. It is now possible to link pcretest with libedit as an alternative to
640        libreadline.
642    16. (*COMMIT) control verb is now supported by the JIT compiler.
644    17. The Unicode data tables have been updated to Unicode 6.1.0.
646    18. Added --file-list option to pcregrep.
648    19. Added binary file support to pcregrep, including the -a, --binary-files,
649        -I, and --text options.
651    20. The madvise function is renamed for posix_madvise for QNX compatibility
652        reasons. Fixed by Giuseppe D'Angelo.
654    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
656    22. Changed the option for creating symbolic links for 16-bit man pages from
657        -s to -sf so that re-installing does not cause issues.
659    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
661    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
662        matches in certain environments (the workspace was not being correctly
663        retained). Also added to pcre_dfa_exec() a simple plausibility check on
664        some of the workspace data at the beginning of a restart.
666    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
667        was not doing so when it should - probably a typo introduced by SVN 528
668        (change 8.10/14).
670    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
671        \w+ when the character tables indicated that \x{c4} was a word character.
672        There were several related cases, all because the tests for doing a table
673        lookup were testing for characters less than 127 instead of 255.
675    27. If a pattern contains capturing parentheses that are not used in a match,
676        their slots in the ovector are set to -1. For those that are higher than
677        any matched groups, this happens at the end of processing. In the case when
678        there were back references that the ovector was too small to contain
679        (causing temporary malloc'd memory to be used during matching), and the
680        highest capturing number was not used, memory off the end of the ovector
681        was incorrectly being set to -1. (It was using the size of the temporary
682        memory instead of the true size.)
684    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
685        ovector size, it uses memory at the end of the block that it has got.
687    29. Check for an overlong MARK name and give an error at compile time. The
688        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
690    30. JIT compiler update.
692    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
693        Rill for the patch.
695    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
697    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
699    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
700        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
701        was enabled.
703    35. Improve JIT code generation for greedy plus quantifier.
705    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
706        1 to "aa" instead of to an empty string. The bug affected repeated groups
707        that could potentially match an empty string.
709    37. Optimizing single character iterators in JIT.
711    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
712        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
713        codepoints that are too big for the mode are faulted, and in a UTF mode,
714        disallowed codepoints are also faulted.
716    39. If PCRE was compiled with UTF support, in three places in the DFA
717        matcher there was code that should only have been obeyed in UTF mode, but
718        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
719        processing when bytes with values greater than 127 were present. In 16-bit
720        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
721        both cases the values are those that cannot be the first data item in a UTF
722        character. The three items that might have provoked this were recursions,
723        possessively repeated groups, and atomic groups.
725    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
726        and pcregrep, because some OS require shared objects to be explicitly
727        passed to ld, causing the link step to fail if they are not.
729    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
730        mode, patterns that started with \h* or \R* might be incorrectly matched.
733    Version 8.30 04-February-2012
734    -----------------------------
736    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
737        name is defined in ctype.h.
739    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
740        only in quite long subpatterns.
742    3.  Removed the function pcre_info(), which has been obsolete and deprecated
743        since it was replaced by pcre_fullinfo() in February 2000.
745    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
746        match a (*MARK), and the match failed at the start of the subject, a
747        reference to memory before the start of the subject could occur. This bug
748        was introduced by fix 17 of release 8.21.
750    5.  A reference to an unset group with zero minimum repetition was giving
751        totally wrong answers (in non-JavaScript-compatibility mode). For example,
752        /(another)?(\1?)test/ matched against "hello world test". This bug was
753        introduced in release 8.13.
755    6.  Add support for 16-bit character strings (a large amount of work involving
756        many changes and refactorings).
758    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
759        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
760        from a file.
762    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
763        rounding is not applied in this particular case).
765    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
766        if they appear, or are escaped, in patterns.
768    10. Get rid of a number of -Wunused-but-set-variable warnings.
770    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
771        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
772        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
773        also returns the mark "x". This bug applied to capturing parentheses,
774        non-capturing parentheses, and atomic parentheses. It also applied to some
775        assertions.
777    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
778        information out of configure.ac instead of relying on pcre.h.generic, which
779        is not stored in the repository.
781    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
782        -lreadline.
784    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
786    15. Applied Graycode's patch to put the top-level frame on the stack rather
787        than the heap when not using the stack for recursion. This gives a
788        performance improvement in many cases when recursion is not deep.
790    16. Experimental code added to "pcretest -C" to output the stack frame size.
793    Version 8.21 12-Dec-2011
794    ------------------------
796  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
# Line 13  Version 8.21 Line 802  Version 8.21
802      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
803      calling _pcre_jit_exec. Some extra comments are added.      calling _pcre_jit_exec. Some extra comments are added.
805  4.  Mark settings inside atomic groups that do not contain any capturing  4.  (*MARK) settings inside atomic groups that do not contain any capturing
806      parentheses, for example, (?>a(*:m)), were not being passed out. This bug      parentheses, for example, (?>a(*:m)), were not being passed out. This bug
807      was introduced by change 18 for 8.20.      was introduced by change 18 for 8.20.
# Line 22  Version 8.21 Line 811  Version 8.21
812  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
813      erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.      erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
814      This bug was probably introduced by change 9 of 8.13.      This bug was probably introduced by change 9 of 8.13.
816  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
817      incorrectly rejected as "not fixed length". This arose partly because newer      incorrectly rejected as "not fixed length". This arose partly because newer
818      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)
819      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
820      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
821      length instead of just assuming "not fixed length". The items that were      length instead of just assuming "not fixed length". The items that were
822      rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),      rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
823      (*THEN), \h, \H, \v, \V, and single character negative classes with fixed      (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
824      repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.      repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
826    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
827        being incorrectly compiled and would have given unpredicatble results.
829    9.  A possessively repeated subpattern with minimum repeat count greater than
830        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
831        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
832        the first (A) could occur when it should not.
834    10. Add a cast and remove a redundant test from the code.
836    11. JIT should use pcre_malloc/pcre_free for allocation.
838    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
839        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
840        is anything other than /usr, -L is still shown).
842    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
844    14. Perl does not support \N without a following name in a [] class; PCRE now
845        also gives an error.
847    15. If a forward reference was repeated with an upper limit of around 2000,
848        it caused the error "internal error: overran compiling workspace". The
849        maximum number of forward references (including repeats) was limited by the
850        internal workspace, and dependent on the LINK_SIZE. The code has been
851        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
852        the default depends on LINK_SIZE. There is a new upper limit (for safety)
853        of around 200,000 forward references. While doing this, I also speeded up
854        the filling in of repeated forward references.
856    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
857        incorrectly expecting the subject to contain another "a" after the start.
859    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
860        in the match, the SKIP should be ignored. This was not happening; instead
861        the SKIP was being treated as NOMATCH. For patterns such as
862        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
863        tested.
865    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
866        now much more compatible with Perl, in particular in cases where the result
867        is a non-match for a non-anchored pattern. For example, if
868        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
869        "m", where previously it did not return a name. A side effect of this
870        change is that for partial matches, the last encountered mark name is
871        returned, as for non matches. A number of tests that were previously not
872        Perl-compatible have been moved into the Perl-compatible test files. The
873        refactoring has had the pleasing side effect of removing one argument from
874        the match() function, thus reducing its stack requirements.
876    19. If the /S+ option was used in pcretest to study a pattern using JIT,
877        subsequent uses of /S (without +) incorrectly behaved like /S+.
879    21. Retrieve executable code size support for the JIT compiler and fixing
880        some warnings.
882    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
883        not work when the shorter character appeared right at the end of the
884        subject string.
886    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
887        systems.
889    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
890        output it when the /M option is used in pcretest.
892    25. The CheckMan script was not being included in the distribution. Also, added
893        an explicit "perl" to run Perl scripts from the PrepareRelease script
894        because this is reportedly needed in Windows.
896    26. If study data was being save in a file and studying had not found a set of
897        "starts with" bytes for the pattern, the data written to the file (though
898        never used) was taken from uninitialized memory and so caused valgrind to
899        complain.
901    27. Updated RunTest.bat as provided by Sheri Pierce.
903    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
905    29. Computation of memory usage for the table of capturing group names was
906        giving an unnecessarily large value.
909  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011
910  ------------------------  ------------------------
# Line 1049  Version 7.9 11-Apr-09 Line 1920  Version 7.9 11-Apr-09
1920  7.  A pattern that could match an empty string could cause pcregrep to loop; it  7.  A pattern that could match an empty string could cause pcregrep to loop; it
1921      doesn't make sense to accept an empty string match in pcregrep, so I have      doesn't make sense to accept an empty string match in pcregrep, so I have
1922      locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this      locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
1923      seems to be how GNU grep behaves.      seems to be how GNU grep behaves. [But see later change 40 for release
1924        8.33.]
1926  8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at  8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
1927      start or after a newline", because the conditional assertion was not being      start or after a newline", because the conditional assertion was not being
# Line 1292  Version 7.7 07-May-08 Line 2164  Version 7.7 07-May-08
2164      containing () gave an internal compiling error instead of "reference to      containing () gave an internal compiling error instead of "reference to
2165      non-existent subpattern". Fortunately, when the pattern did exist, the      non-existent subpattern". Fortunately, when the pattern did exist, the
2166      compiled code was correct. (When scanning forwards to check for the      compiled code was correct. (When scanning forwards to check for the
2167      existencd of the subpattern, it was treating the data ']' as terminating      existence of the subpattern, it was treating the data ']' as terminating
2168      the class, so got the count wrong. When actually compiling, the reference      the class, so got the count wrong. When actually compiling, the reference
2169      was subsequently set up correctly.)      was subsequently set up correctly.)

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