/[pcre]/code/trunk/ChangeLog
ViewVC logotype

Diff of /code/trunk/ChangeLog

Parent Directory Parent Directory | Revision Log Revision Log | View Patch Patch

revision 505 by ph10, Tue Mar 9 16:50:47 2010 UTC revision 1187 by zherczeg, Mon Oct 29 11:30:45 2012 UTC
# Line 1  Line 1 
1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.02 01-Mar-2010  Version 8.32
5    ------------
6    
7    1.  Improved JIT compiler optimizations for first character search and single
8        character iterators.
9    
10    2.  Supporting IBM XL C compilers for PPC architectures in the JIT compiler.
11        Patch by Daniel Richard G.
12    
13    3.  Single character iterator optimizations in the JIT compiler.
14    
15    4.  Improved JIT compiler optimizations for character ranges.
16    
17    5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
18        Reported by Giuseppe D'Angelo.
19    
20    6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
21        of a line, was being set incorrectly in cases where .* appeared inside
22        atomic brackets at the start of a pattern, or where there was a subsequent
23        *PRUNE or *SKIP.
24    
25    7.  Improved instruction cache flush for POWER/PowerPC.
26        Patch by Daniel Richard G.
27    
28    8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
29        grep:
30    
31        (a) There is now no limit to the number of patterns to be matched.
32    
33        (b) An error is given if a pattern is too long.
34    
35        (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
36            are now supported.
37    
38        (d) --exclude-from and --include-from (multiple use) have been added.
39    
40        (e) Exclusions and inclusions now apply to all files and directories, not
41            just to those obtained from scanning a directory recursively.
42    
43        (f) Multiple uses of -f and --file-list are now supported.
44    
45        (g) In a Windows environment, the default for -d has been changed from
46            "read" (the GNU grep default) to "skip", because otherwise the presence
47            of a directory in the file list provokes an error.
48    
49        (h) The documentation has been revised and clarified in places.
50    
51    9.  Improve the matching speed of capturing brackets.
52    
53    10. Changed the meaning of \X so that it now matches a Unicode extended
54        grapheme cluster.
55    
56    11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
57        out POSIX threads when JIT support is configured.
58    
59    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
60    
61    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
62        structure could go wrong in environments where size_t is not the same size
63        as int.
64    
65    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
66        set.
67    
68    15. The EBCDIC support had decayed; later updates to the code had included
69        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
70        general tidy up of EBCDIC-related issues, and the documentation was also
71        not quite right. There is now a test that can be run on ASCII systems to
72        check some of the EBCDIC-related things (but is it not a full test).
73    
74    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
75        in a small tidy to the code.
76    
77    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
78    
79    18. If the --only-matching (-o) option in pcregrep is specified multiple
80        times, each one causes appropriate output. For example, -o1 -o2 outputs the
81        substrings matched by the 1st and 2nd capturing parentheses. A separating
82        string can be specified by --om-separator (default empty).
83    
84    19. Improving the first n character searches.
85    
86    20. Turn case lists for horizontal and vertical white space into macros so that
87        they are defined only once.
88    
89    21. This set of changes together give more compatible Unicode case-folding
90        behaviour for characters that have more than one other case when UCP
91        support is available.
92    
93        (a) The Unicode property table now has offsets into a new table of sets of
94            three or more characters that are case-equivalent. The MultiStage2.py
95            script that generates these tables (the pcre_ucd.c file) now scans
96            CaseFolding.txt instead of UnicodeData.txt for character case
97            information.
98    
99        (b) The code for adding characters or ranges of characters to a character
100            class has been abstracted into a generalized function that also handles
101            case-independence. In UTF-mode with UCP support, this uses the new data
102            to handle characters with more than one other case.
103    
104        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
105            whose other case is greater than 256 are now correctly matched
106            caselessly. Previously, the high codepoint matched the low one, but not
107            vice versa.
108    
109        (d) The processing of \h, \H, \v, and \ in character classes now makes use
110            of the new class addition function, using character lists defined as
111            macros alongside the case definitions of 20 above.
112    
113        (e) Caseless back references now work with characters that have more than
114            one other case.
115    
116        (f) General caseless matching of characters with more than one other case
117            is supported.
118    
119    22. Unicode character properties were updated from Unicode 6.2.0
120    
121    23. Improved CMake support under Windows. Patch by Daniel Richard G.
122    
123    24. Add support for 32-bit character strings, and UTF-32
124    
125    25. Major JIT compiler update (code refactoring and bugfixing).
126        Experimental Sparc 32 support is added.
127    
128    26. Applied a modified version of Daniel Richard G's patch to create
129        pcre.h.generic and config.h.generic by "make" instead of in the
130        PrepareRelease script.
131    
132    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
133        pcre_compile.c when checking for a zero character.
134    
135    28. Introducing a native interface for JIT. Through this interface, the compiled
136        machine code can be directly executed. The purpose of this interface is to
137        provide fast pattern matching, so several sanity checks are not performed.
138        However, feature tests are still performed. The new interface provides
139        1.4x speedup compared to the old one.
140    
141    
142    Version 8.31 06-July-2012
143    -------------------------
144    
145    1.  Fixing a wrong JIT test case and some compiler warnings.
146    
147    2.  Removed a bashism from the RunTest script.
148    
149    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
150        to unsigned type, result still unsigned" that was given by an MS compiler
151        on encountering the code "-sizeof(xxx)".
152    
153    4.  Partial matching support is added to the JIT compiler.
154    
155    5.  Fixed several bugs concerned with partial matching of items that consist
156        of more than one character:
157    
158        (a) /^(..)\1/ did not partially match "aba" because checking references was
159            done on an "all or nothing" basis. This also applied to repeated
160            references.
161    
162        (b) \R did not give a hard partial match if \r was found at the end of the
163            subject.
164    
165        (c) \X did not give a hard partial match after matching one or more
166            characters at the end of the subject.
167    
168        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
169            a partial match for the string "\r".
170    
171        (e) When newline was set to CRLF, the metacharacter "." did not recognize
172            a partial match for a CR character at the end of the subject string.
173    
174    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
175        running pcretest, the text "(JIT)" added to the output whenever JIT is
176        actually used to run the match.
177    
178    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
179        or /S+[+] with a digit between 1 and 7.
180    
181    8.  OP_NOT now supports any UTF character not just single-byte ones.
182    
183    9.  (*MARK) control verb is now supported by the JIT compiler.
184    
185    10. The command "./RunTest list" lists the available tests without actually
186        running any of them. (Because I keep forgetting what they all are.)
187    
188    11. Add PCRE_INFO_MAXLOOKBEHIND.
189    
190    12. Applied a (slightly modified) user-supplied patch that improves performance
191        when the heap is used for recursion (compiled with --disable-stack-for-
192        recursion). Instead of malloc and free for each heap frame each time a
193        logical recursion happens, frames are retained on a chain and re-used where
194        possible. This sometimes gives as much as 30% improvement.
195    
196    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
197        call.
198    
199    14. As documented, (*COMMIT) is now confined to within a positive assertion.
200    
201    15. It is now possible to link pcretest with libedit as an alternative to
202        libreadline.
203    
204    16. (*COMMIT) control verb is now supported by the JIT compiler.
205    
206    17. The Unicode data tables have been updated to Unicode 6.1.0.
207    
208    18. Added --file-list option to pcregrep.
209    
210    19. Added binary file support to pcregrep, including the -a, --binary-files,
211        -I, and --text options.
212    
213    20. The madvise function is renamed for posix_madvise for QNX compatibility
214        reasons. Fixed by Giuseppe D'Angelo.
215    
216    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
217    
218    22. Changed the option for creating symbolic links for 16-bit man pages from
219        -s to -sf so that re-installing does not cause issues.
220    
221    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
222    
223    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
224        matches in certain environments (the workspace was not being correctly
225        retained). Also added to pcre_dfa_exec() a simple plausibility check on
226        some of the workspace data at the beginning of a restart.
227    
228    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
229        was not doing so when it should - probably a typo introduced by SVN 528
230        (change 8.10/14).
231    
232    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
233        \w+ when the character tables indicated that \x{c4} was a word character.
234        There were several related cases, all because the tests for doing a table
235        lookup were testing for characters less than 127 instead of 255.
236    
237    27. If a pattern contains capturing parentheses that are not used in a match,
238        their slots in the ovector are set to -1. For those that are higher than
239        any matched groups, this happens at the end of processing. In the case when
240        there were back references that the ovector was too small to contain
241        (causing temporary malloc'd memory to be used during matching), and the
242        highest capturing number was not used, memory off the end of the ovector
243        was incorrectly being set to -1. (It was using the size of the temporary
244        memory instead of the true size.)
245    
246    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
247        ovector size, it uses memory at the end of the block that it has got.
248    
249    29. Check for an overlong MARK name and give an error at compile time. The
250        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
251    
252    30. JIT compiler update.
253    
254    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
255        Rill for the patch.
256    
257    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
258    
259    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
260    
261    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
262        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
263        was enabled.
264    
265    35. Improve JIT code generation for greedy plus quantifier.
266    
267    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
268        1 to "aa" instead of to an empty string. The bug affected repeated groups
269        that could potentially match an empty string.
270    
271    37. Optimizing single character iterators in JIT.
272    
273    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
274        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
275        codepoints that are too big for the mode are faulted, and in a UTF mode,
276        disallowed codepoints are also faulted.
277    
278    39. If PCRE was compiled with UTF support, in three places in the DFA
279        matcher there was code that should only have been obeyed in UTF mode, but
280        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
281        processing when bytes with values greater than 127 were present. In 16-bit
282        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
283        both cases the values are those that cannot be the first data item in a UTF
284        character. The three items that might have provoked this were recursions,
285        possessively repeated groups, and atomic groups.
286    
287    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
288        and pcregrep, because some OS require shared objects to be explicitly
289        passed to ld, causing the link step to fail if they are not.
290    
291    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
292        mode, patterns that started with \h* or \R* might be incorrectly matched.
293    
294    
295    Version 8.30 04-February-2012
296    -----------------------------
297    
298    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
299        name is defined in ctype.h.
300    
301    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
302        only in quite long subpatterns.
303    
304    3.  Removed the function pcre_info(), which has been obsolete and deprecated
305        since it was replaced by pcre_fullinfo() in February 2000.
306    
307    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
308        match a (*MARK), and the match failed at the start of the subject, a
309        reference to memory before the start of the subject could occur. This bug
310        was introduced by fix 17 of release 8.21.
311    
312    5.  A reference to an unset group with zero minimum repetition was giving
313        totally wrong answers (in non-JavaScript-compatibility mode). For example,
314        /(another)?(\1?)test/ matched against "hello world test". This bug was
315        introduced in release 8.13.
316    
317    6.  Add support for 16-bit character strings (a large amount of work involving
318        many changes and refactorings).
319    
320    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
321        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
322        from a file.
323    
324    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
325        rounding is not applied in this particular case).
326    
327    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
328        if they appear, or are escaped, in patterns.
329    
330    10. Get rid of a number of -Wunused-but-set-variable warnings.
331    
332    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
333        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
334        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
335        also returns the mark "x". This bug applied to capturing parentheses,
336        non-capturing parentheses, and atomic parentheses. It also applied to some
337        assertions.
338    
339    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
340        information out of configure.ac instead of relying on pcre.h.generic, which
341        is not stored in the repository.
342    
343    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
344        -lreadline.
345    
346    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
347    
348    15. Applied Graycode's patch to put the top-level frame on the stack rather
349        than the heap when not using the stack for recursion. This gives a
350        performance improvement in many cases when recursion is not deep.
351    
352    16. Experimental code added to "pcretest -C" to output the stack frame size.
353    
354    
355    Version 8.21 12-Dec-2011
356    ------------------------
357    
358    1.  Updating the JIT compiler.
359    
360    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
361        are added as well.
362    
363    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
364        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
365        calling _pcre_jit_exec. Some extra comments are added.
366    
367    4.  (*MARK) settings inside atomic groups that do not contain any capturing
368        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
369        was introduced by change 18 for 8.20.
370    
371    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
372        ECMA-262 standard.
373    
374    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
375        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
376        This bug was probably introduced by change 9 of 8.13.
377    
378    7.  While fixing 6 above, I noticed that a number of other items were being
379        incorrectly rejected as "not fixed length". This arose partly because newer
380        opcodes had not been added to the fixed-length checking code. I have (a)
381        corrected the bug and added tests for these items, and (b) arranged for an
382        error to occur if an unknown opcode is encountered while checking for fixed
383        length instead of just assuming "not fixed length". The items that were
384        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
385        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
386        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
387    
388    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
389        being incorrectly compiled and would have given unpredicatble results.
390    
391    9.  A possessively repeated subpattern with minimum repeat count greater than
392        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
393        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
394        the first (A) could occur when it should not.
395    
396    10. Add a cast and remove a redundant test from the code.
397    
398    11. JIT should use pcre_malloc/pcre_free for allocation.
399    
400    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
401        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
402        is anything other than /usr, -L is still shown).
403    
404    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
405    
406    14. Perl does not support \N without a following name in a [] class; PCRE now
407        also gives an error.
408    
409    15. If a forward reference was repeated with an upper limit of around 2000,
410        it caused the error "internal error: overran compiling workspace". The
411        maximum number of forward references (including repeats) was limited by the
412        internal workspace, and dependent on the LINK_SIZE. The code has been
413        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
414        the default depends on LINK_SIZE. There is a new upper limit (for safety)
415        of around 200,000 forward references. While doing this, I also speeded up
416        the filling in of repeated forward references.
417    
418    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
419        incorrectly expecting the subject to contain another "a" after the start.
420    
421    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
422        in the match, the SKIP should be ignored. This was not happening; instead
423        the SKIP was being treated as NOMATCH. For patterns such as
424        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
425        tested.
426    
427    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
428        now much more compatible with Perl, in particular in cases where the result
429        is a non-match for a non-anchored pattern. For example, if
430        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
431        "m", where previously it did not return a name. A side effect of this
432        change is that for partial matches, the last encountered mark name is
433        returned, as for non matches. A number of tests that were previously not
434        Perl-compatible have been moved into the Perl-compatible test files. The
435        refactoring has had the pleasing side effect of removing one argument from
436        the match() function, thus reducing its stack requirements.
437    
438    19. If the /S+ option was used in pcretest to study a pattern using JIT,
439        subsequent uses of /S (without +) incorrectly behaved like /S+.
440    
441    21. Retrieve executable code size support for the JIT compiler and fixing
442        some warnings.
443    
444    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
445        not work when the shorter character appeared right at the end of the
446        subject string.
447    
448    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
449        systems.
450    
451    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
452        output it when the /M option is used in pcretest.
453    
454    25. The CheckMan script was not being included in the distribution. Also, added
455        an explicit "perl" to run Perl scripts from the PrepareRelease script
456        because this is reportedly needed in Windows.
457    
458    26. If study data was being save in a file and studying had not found a set of
459        "starts with" bytes for the pattern, the data written to the file (though
460        never used) was taken from uninitialized memory and so caused valgrind to
461        complain.
462    
463    27. Updated RunTest.bat as provided by Sheri Pierce.
464    
465    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
466    
467    29. Computation of memory usage for the table of capturing group names was
468        giving an unnecessarily large value.
469    
470    
471    Version 8.20 21-Oct-2011
472    ------------------------
473    
474    1.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had
475        a POSIX class. After further experiments with Perl, which convinced me that
476        Perl has bugs and confusions, a closing square bracket is no longer allowed
477        in a POSIX name. This bug also affected patterns with classes that started
478        with full stops.
479    
480    2.  If a pattern such as /(a)b|ac/ is matched against "ac", there is no
481        captured substring, but while checking the failing first alternative,
482        substring 1 is temporarily captured. If the output vector supplied to
483        pcre_exec() was not big enough for this capture, the yield of the function
484        was still zero ("insufficient space for captured substrings"). This cannot
485        be totally fixed without adding another stack variable, which seems a lot
486        of expense for a edge case. However, I have improved the situation in cases
487        such as /(a)(b)x|abc/ matched against "abc", where the return code
488        indicates that fewer than the maximum number of slots in the ovector have
489        been set.
490    
491    3.  Related to (2) above: when there are more back references in a pattern than
492        slots in the output vector, pcre_exec() uses temporary memory during
493        matching, and copies in the captures as far as possible afterwards. It was
494        using the entire output vector, but this conflicts with the specification
495        that only 2/3 is used for passing back captured substrings. Now it uses
496        only the first 2/3, for compatibility. This is, of course, another edge
497        case.
498    
499    4.  Zoltan Herczeg's just-in-time compiler support has been integrated into the
500        main code base, and can be used by building with --enable-jit. When this is
501        done, pcregrep automatically uses it unless --disable-pcregrep-jit or the
502        runtime --no-jit option is given.
503    
504    5.  When the number of matches in a pcre_dfa_exec() run exactly filled the
505        ovector, the return from the function was zero, implying that there were
506        other matches that did not fit. The correct "exactly full" value is now
507        returned.
508    
509    6.  If a subpattern that was called recursively or as a subroutine contained
510        (*PRUNE) or any other control that caused it to give a non-standard return,
511        invalid errors such as "Error -26 (nested recursion at the same subject
512        position)" or even infinite loops could occur.
513    
514    7.  If a pattern such as /a(*SKIP)c|b(*ACCEPT)|/ was studied, it stopped
515        computing the minimum length on reaching *ACCEPT, and so ended up with the
516        wrong value of 1 rather than 0. Further investigation indicates that
517        computing a minimum subject length in the presence of *ACCEPT is difficult
518        (think back references, subroutine calls), and so I have changed the code
519        so that no minimum is registered for a pattern that contains *ACCEPT.
520    
521    8.  If (*THEN) was present in the first (true) branch of a conditional group,
522        it was not handled as intended. [But see 16 below.]
523    
524    9.  Replaced RunTest.bat and CMakeLists.txt with improved versions provided by
525        Sheri Pierce.
526    
527    10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that
528        the first byte in a match must be "a".
529    
530    11. Change 17 for 8.13 increased the recursion depth for patterns like
531        /a(?:.)*?a/ drastically. I've improved things by remembering whether a
532        pattern contains any instances of (*THEN). If it does not, the old
533        optimizations are restored. It would be nice to do this on a per-group
534        basis, but at the moment that is not feasible.
535    
536    12. In some environments, the output of pcretest -C is CRLF terminated. This
537        broke RunTest's code that checks for the link size. A single white space
538        character after the value is now allowed for.
539    
540    13. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".
541        For "fr", it uses the Windows-specific input and output files.
542    
543    14. If (*THEN) appeared in a group that was called recursively or as a
544        subroutine, it did not work as intended. [But see next item.]
545    
546    15. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex
547        pattern fragments (but not containing any | characters). If A and B are
548        matched, but there is a failure in C so that it backtracks to (*THEN), PCRE
549        was behaving differently to Perl. PCRE backtracked into A, but Perl goes to
550        D. In other words, Perl considers parentheses that do not contain any |
551        characters to be part of a surrounding alternative, whereas PCRE was
552        treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles
553        differently. PCRE now behaves in the same way as Perl, except in the case
554        of subroutine/recursion calls such as (?1) which have in any case always
555        been different (but PCRE had them first :-).
556    
557    16. Related to 15 above: Perl does not treat the | in a conditional group as
558        creating alternatives. Such a group is treated in the same way as an
559        ordinary group without any | characters when processing (*THEN). PCRE has
560        been changed to match Perl's behaviour.
561    
562    17. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the
563        RunGrepTest script failed.
564    
565    18. Change 22 for version 13 caused atomic groups to use more stack. This is
566        inevitable for groups that contain captures, but it can lead to a lot of
567        stack use in large patterns. The old behaviour has been restored for atomic
568        groups that do not contain any capturing parentheses.
569    
570    19. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not
571        suppress the check for a minimum subject length at run time. (If it was
572        given to pcre_exec() or pcre_dfa_exec() it did work.)
573    
574    20. Fixed an ASCII-dependent infelicity in pcretest that would have made it
575        fail to work when decoding hex characters in data strings in EBCDIC
576        environments.
577    
578    21. It appears that in at least one Mac OS environment, the isxdigit() function
579        is implemented as a macro that evaluates to its argument more than once,
580        contravening the C 90 Standard (I haven't checked a later standard). There
581        was an instance in pcretest which caused it to go wrong when processing
582        \x{...} escapes in subject strings. The has been rewritten to avoid using
583        things like p++ in the argument of isxdigit().
584    
585    
586    Version 8.13 16-Aug-2011
587    ------------------------
588    
589    1.  The Unicode data tables have been updated to Unicode 6.0.0.
590    
591    2.  Two minor typos in pcre_internal.h have been fixed.
592    
593    3.  Added #include <string.h> to pcre_scanner_unittest.cc, pcrecpp.cc, and
594        pcrecpp_unittest.cc. They are needed for strcmp(), memset(), and strchr()
595        in some environments (e.g. Solaris 10/SPARC using Sun Studio 12U2).
596    
597    4.  There were a number of related bugs in the code for matching backrefences
598        caselessly in UTF-8 mode when codes for the characters concerned were
599        different numbers of bytes. For example, U+023A and U+2C65 are an upper
600        and lower case pair, using 2 and 3 bytes, respectively. The main bugs were:
601        (a) A reference to 3 copies of a 2-byte code matched only 2 of a 3-byte
602        code. (b) A reference to 2 copies of a 3-byte code would not match 2 of a
603        2-byte code at the end of the subject (it thought there wasn't enough data
604        left).
605    
606    5.  Comprehensive information about what went wrong is now returned by
607        pcre_exec() and pcre_dfa_exec() when the UTF-8 string check fails, as long
608        as the output vector has at least 2 elements. The offset of the start of
609        the failing character and a reason code are placed in the vector.
610    
611    6.  When the UTF-8 string check fails for pcre_compile(), the offset that is
612        now returned is for the first byte of the failing character, instead of the
613        last byte inspected. This is an incompatible change, but I hope it is small
614        enough not to be a problem. It makes the returned offset consistent with
615        pcre_exec() and pcre_dfa_exec().
616    
617    7.  pcretest now gives a text phrase as well as the error number when
618        pcre_exec() or pcre_dfa_exec() fails; if the error is a UTF-8 check
619        failure, the offset and reason code are output.
620    
621    8.  When \R was used with a maximizing quantifier it failed to skip backwards
622        over a \r\n pair if the subsequent match failed. Instead, it just skipped
623        back over a single character (\n). This seems wrong (because it treated the
624        two characters as a single entity when going forwards), conflicts with the
625        documentation that \R is equivalent to (?>\r\n|\n|...etc), and makes the
626        behaviour of \R* different to (\R)*, which also seems wrong. The behaviour
627        has been changed.
628    
629    9.  Some internal refactoring has changed the processing so that the handling
630        of the PCRE_CASELESS and PCRE_MULTILINE options is done entirely at compile
631        time (the PCRE_DOTALL option was changed this way some time ago: version
632        7.7 change 16). This has made it possible to abolish the OP_OPT op code,
633        which was always a bit of a fudge. It also means that there is one less
634        argument for the match() function, which reduces its stack requirements
635        slightly. This change also fixes an incompatibility with Perl: the pattern
636        (?i:([^b]))(?1) should not match "ab", but previously PCRE gave a match.
637    
638    10. More internal refactoring has drastically reduced the number of recursive
639        calls to match() for possessively repeated groups such as (abc)++ when
640        using pcre_exec().
641    
642    11. While implementing 10, a number of bugs in the handling of groups were
643        discovered and fixed:
644    
645        (?<=(a)+) was not diagnosed as invalid (non-fixed-length lookbehind).
646        (a|)*(?1) gave a compile-time internal error.
647        ((a|)+)+  did not notice that the outer group could match an empty string.
648        (^a|^)+   was not marked as anchored.
649        (.*a|.*)+ was not marked as matching at start or after a newline.
650    
651    12. Yet more internal refactoring has removed another argument from the match()
652        function. Special calls to this function are now indicated by setting a
653        value in a variable in the "match data" data block.
654    
655    13. Be more explicit in pcre_study() instead of relying on "default" for
656        opcodes that mean there is no starting character; this means that when new
657        ones are added and accidentally left out of pcre_study(), testing should
658        pick them up.
659    
660    14. The -s option of pcretest has been documented for ages as being an old
661        synonym of -m (show memory usage). I have changed it to mean "force study
662        for every regex", that is, assume /S for every regex. This is similar to -i
663        and -d etc. It's slightly incompatible, but I'm hoping nobody is still
664        using it. It makes it easier to run collections of tests with and without
665        study enabled, and thereby test pcre_study() more easily. All the standard
666        tests are now run with and without -s (but some patterns can be marked as
667        "never study" - see 20 below).
668    
669    15. When (*ACCEPT) was used in a subpattern that was called recursively, the
670        restoration of the capturing data to the outer values was not happening
671        correctly.
672    
673    16. If a recursively called subpattern ended with (*ACCEPT) and matched an
674        empty string, and PCRE_NOTEMPTY was set, pcre_exec() thought the whole
675        pattern had matched an empty string, and so incorrectly returned a no
676        match.
677    
678    17. There was optimizing code for the last branch of non-capturing parentheses,
679        and also for the obeyed branch of a conditional subexpression, which used
680        tail recursion to cut down on stack usage. Unfortunately, now that there is
681        the possibility of (*THEN) occurring in these branches, tail recursion is
682        no longer possible because the return has to be checked for (*THEN). These
683        two optimizations have therefore been removed. [But see 8.20/11 above.]
684    
685    18. If a pattern containing \R was studied, it was assumed that \R always
686        matched two bytes, thus causing the minimum subject length to be
687        incorrectly computed because \R can also match just one byte.
688    
689    19. If a pattern containing (*ACCEPT) was studied, the minimum subject length
690        was incorrectly computed.
691    
692    20. If /S is present twice on a test pattern in pcretest input, it now
693        *disables* studying, thereby overriding the use of -s on the command line
694        (see 14 above). This is necessary for one or two tests to keep the output
695        identical in both cases.
696    
697    21. When (*ACCEPT) was used in an assertion that matched an empty string and
698        PCRE_NOTEMPTY was set, PCRE applied the non-empty test to the assertion.
699    
700    22. When an atomic group that contained a capturing parenthesis was
701        successfully matched, but the branch in which it appeared failed, the
702        capturing was not being forgotten if a higher numbered group was later
703        captured. For example, /(?>(a))b|(a)c/ when matching "ac" set capturing
704        group 1 to "a", when in fact it should be unset. This applied to multi-
705        branched capturing and non-capturing groups, repeated or not, and also to
706        positive assertions (capturing in negative assertions does not happen
707        in PCRE) and also to nested atomic groups.
708    
709    23. Add the ++ qualifier feature to pcretest, to show the remainder of the
710        subject after a captured substring, to make it easier to tell which of a
711        number of identical substrings has been captured.
712    
713    24. The way atomic groups are processed by pcre_exec() has been changed so that
714        if they are repeated, backtracking one repetition now resets captured
715        values correctly. For example, if ((?>(a+)b)+aabab) is matched against
716        "aaaabaaabaabab" the value of captured group 2 is now correctly recorded as
717        "aaa". Previously, it would have been "a". As part of this code
718        refactoring, the way recursive calls are handled has also been changed.
719    
720    25. If an assertion condition captured any substrings, they were not passed
721        back unless some other capturing happened later. For example, if
722        (?(?=(a))a) was matched against "a", no capturing was returned.
723    
724    26. When studying a pattern that contained subroutine calls or assertions,
725        the code for finding the minimum length of a possible match was handling
726        direct recursions such as (xxx(?1)|yyy) but not mutual recursions (where
727        group 1 called group 2 while simultaneously a separate group 2 called group
728        1). A stack overflow occurred in this case. I have fixed this by limiting
729        the recursion depth to 10.
730    
731    27. Updated RunTest.bat in the distribution to the version supplied by Tom
732        Fortmann. This supports explicit test numbers on the command line, and has
733        argument validation and error reporting.
734    
735    28. An instance of \X with an unlimited repeat could fail if at any point the
736        first character it looked at was a mark character.
737    
738    29. Some minor code refactoring concerning Unicode properties and scripts
739        should reduce the stack requirement of match() slightly.
740    
741    30. Added the '=' option to pcretest to check the setting of unused capturing
742        slots at the end of the pattern, which are documented as being -1, but are
743        not included in the return count.
744    
745    31. If \k was not followed by a braced, angle-bracketed, or quoted name, PCRE
746        compiled something random. Now it gives a compile-time error (as does
747        Perl).
748    
749    32. A *MARK encountered during the processing of a positive assertion is now
750        recorded and passed back (compatible with Perl).
751    
752    33. If --only-matching or --colour was set on a pcregrep call whose pattern
753        had alternative anchored branches, the search for a second match in a line
754        was done as if at the line start. Thus, for example, /^01|^02/ incorrectly
755        matched the line "0102" twice. The same bug affected patterns that started
756        with a backwards assertion. For example /\b01|\b02/ also matched "0102"
757        twice.
758    
759    34. Previously, PCRE did not allow quantification of assertions. However, Perl
760        does, and because of capturing effects, quantifying parenthesized
761        assertions may at times be useful. Quantifiers are now allowed for
762        parenthesized assertions.
763    
764    35. A minor code tidy in pcre_compile() when checking options for \R usage.
765    
766    36. \g was being checked for fancy things in a character class, when it should
767        just be a literal "g".
768    
769    37. PCRE was rejecting [:a[:digit:]] whereas Perl was not. It seems that the
770        appearance of a nested POSIX class supersedes an apparent external class.
771        For example, [:a[:digit:]b:] matches "a", "b", ":", or a digit. Also,
772        unescaped square brackets may also appear as part of class names. For
773        example, [:a[:abc]b:] gives unknown class "[:abc]b:]". PCRE now behaves
774        more like Perl. (But see 8.20/1 above.)
775    
776    38. PCRE was giving an error for \N with a braced quantifier such as {1,} (this
777        was because it thought it was \N{name}, which is not supported).
778    
779    39. Add minix to OS list not supporting the -S option in pcretest.
780    
781    40. PCRE tries to detect cases of infinite recursion at compile time, but it
782        cannot analyze patterns in sufficient detail to catch mutual recursions
783        such as ((?1))((?2)). There is now a runtime test that gives an error if a
784        subgroup is called recursively as a subpattern for a second time at the
785        same position in the subject string. In previous releases this might have
786        been caught by the recursion limit, or it might have run out of stack.
787    
788    41. A pattern such as /(?(R)a+|(?R)b)/ is quite safe, as the recursion can
789        happen only once. PCRE was, however incorrectly giving a compile time error
790        "recursive call could loop indefinitely" because it cannot analyze the
791        pattern in sufficient detail. The compile time test no longer happens when
792        PCRE is compiling a conditional subpattern, but actual runaway loops are
793        now caught at runtime (see 40 above).
794    
795    42. It seems that Perl allows any characters other than a closing parenthesis
796        to be part of the NAME in (*MARK:NAME) and other backtracking verbs. PCRE
797        has been changed to be the same.
798    
799    43. Updated configure.ac to put in more quoting round AC_LANG_PROGRAM etc. so
800        as not to get warnings when autogen.sh is called. Also changed
801        AC_PROG_LIBTOOL (deprecated) to LT_INIT (the current macro).
802    
803    44. To help people who use pcregrep to scan files containing exceedingly long
804        lines, the following changes have been made:
805    
806        (a) The default value of the buffer size parameter has been increased from
807            8K to 20K. (The actual buffer used is three times this size.)
808    
809        (b) The default can be changed by ./configure --with-pcregrep-bufsize when
810            PCRE is built.
811    
812        (c) A --buffer-size=n option has been added to pcregrep, to allow the size
813            to be set at run time.
814    
815        (d) Numerical values in pcregrep options can be followed by K or M, for
816            example --buffer-size=50K.
817    
818        (e) If a line being scanned overflows pcregrep's buffer, an error is now
819            given and the return code is set to 2.
820    
821    45. Add a pointer to the latest mark to the callout data block.
822    
823    46. The pattern /.(*F)/, when applied to "abc" with PCRE_PARTIAL_HARD, gave a
824        partial match of an empty string instead of no match. This was specific to
825        the use of ".".
826    
827    47. The pattern /f.*/8s, when applied to "for" with PCRE_PARTIAL_HARD, gave a
828        complete match instead of a partial match. This bug was dependent on both
829        the PCRE_UTF8 and PCRE_DOTALL options being set.
830    
831    48. For a pattern such as /\babc|\bdef/ pcre_study() was failing to set up the
832        starting byte set, because \b was not being ignored.
833    
834    
835    Version 8.12 15-Jan-2011
836    ------------------------
837    
838    1.  Fixed some typos in the markup of the man pages, and wrote a script that
839        checks for such things as part of the documentation building process.
840    
841    2.  On a big-endian 64-bit system, pcregrep did not correctly process the
842        --match-limit and --recursion-limit options (added for 8.11). In
843        particular, this made one of the standard tests fail. (The integer value
844        went into the wrong half of a long int.)
845    
846    3.  If the --colour option was given to pcregrep with -v (invert match), it
847        did strange things, either producing crazy output, or crashing. It should,
848        of course, ignore a request for colour when reporting lines that do not
849        match.
850    
851    4.  Another pcregrep bug caused similar problems if --colour was specified with
852        -M (multiline) and the pattern match finished with a line ending.
853    
854    5.  In pcregrep, when a pattern that ended with a literal newline sequence was
855        matched in multiline mode, the following line was shown as part of the
856        match. This seems wrong, so I have changed it.
857    
858    6.  Another pcregrep bug in multiline mode, when --colour was specified, caused
859        the check for further matches in the same line (so they could be coloured)
860        to overrun the end of the current line. If another match was found, it was
861        incorrectly shown (and then shown again when found in the next line).
862    
863    7.  If pcregrep was compiled under Windows, there was a reference to the
864        function pcregrep_exit() before it was defined. I am assuming this was
865        the cause of the "error C2371: 'pcregrep_exit' : redefinition;" that was
866        reported by a user. I've moved the definition above the reference.
867    
868    
869    Version 8.11 10-Dec-2010
870    ------------------------
871    
872    1.  (*THEN) was not working properly if there were untried alternatives prior
873        to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
874        backtracked to try for "b" instead of moving to the next alternative branch
875        at the same level (in this case, to look for "c"). The Perl documentation
876        is clear that when (*THEN) is backtracked onto, it goes to the "next
877        alternative in the innermost enclosing group".
878    
879    2.  (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
880        such as   (A(*COMMIT)B(*THEN)C|D)  any failure after matching A should
881        result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
882        (*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
883        (*THEN).
884    
885    3.  If \s appeared in a character class, it removed the VT character from
886        the class, even if it had been included by some previous item, for example
887        in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
888        of \s, but is part of the POSIX "space" class.)
889    
890    4.  A partial match never returns an empty string (because you can always
891        match an empty string at the end of the subject); however the checking for
892        an empty string was starting at the "start of match" point. This has been
893        changed to the "earliest inspected character" point, because the returned
894        data for a partial match starts at this character. This means that, for
895        example, /(?<=abc)def/ gives a partial match for the subject "abc"
896        (previously it gave "no match").
897    
898    5.  Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
899        of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
900        previously a full match would be given. However, setting PCRE_PARTIAL_HARD
901        has an implication that the given string is incomplete (because a partial
902        match is preferred over a full match). For this reason, these items now
903        give a partial match in this situation. [Aside: previously, the one case
904        /t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
905        match rather than a full match, which was wrong by the old rules, but is
906        now correct.]
907    
908    6.  There was a bug in the handling of #-introduced comments, recognized when
909        PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
910        If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
911        UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
912        scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
913        but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
914        places in pcre_compile().
915    
916    7.  Related to (6) above, when pcre_compile() was skipping #-introduced
917        comments when looking ahead for named forward references to subpatterns,
918        the only newline sequence it recognized was NL. It now handles newlines
919        according to the set newline convention.
920    
921    8.  SunOS4 doesn't have strerror() or strtoul(); pcregrep dealt with the
922        former, but used strtoul(), whereas pcretest avoided strtoul() but did not
923        cater for a lack of strerror(). These oversights have been fixed.
924    
925    9.  Added --match-limit and --recursion-limit to pcregrep.
926    
927    10. Added two casts needed to build with Visual Studio when NO_RECURSE is set.
928    
929    11. When the -o option was used, pcregrep was setting a return code of 1, even
930        when matches were found, and --line-buffered was not being honoured.
931    
932    12. Added an optional parentheses number to the -o and --only-matching options
933        of pcregrep.
934    
935    13. Imitating Perl's /g action for multiple matches is tricky when the pattern
936        can match an empty string. The code to do it in pcretest and pcredemo
937        needed fixing:
938    
939        (a) When the newline convention was "crlf", pcretest got it wrong, skipping
940            only one byte after an empty string match just before CRLF (this case
941            just got forgotten; "any" and "anycrlf" were OK).
942    
943        (b) The pcretest code also had a bug, causing it to loop forever in UTF-8
944            mode when an empty string match preceded an ASCII character followed by
945            a non-ASCII character. (The code for advancing by one character rather
946            than one byte was nonsense.)
947    
948        (c) The pcredemo.c sample program did not have any code at all to handle
949            the cases when CRLF is a valid newline sequence.
950    
951    14. Neither pcre_exec() nor pcre_dfa_exec() was checking that the value given
952        as a starting offset was within the subject string. There is now a new
953        error, PCRE_ERROR_BADOFFSET, which is returned if the starting offset is
954        negative or greater than the length of the string. In order to test this,
955        pcretest is extended to allow the setting of negative starting offsets.
956    
957    15. In both pcre_exec() and pcre_dfa_exec() the code for checking that the
958        starting offset points to the beginning of a UTF-8 character was
959        unnecessarily clumsy. I tidied it up.
960    
961    16. Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
962        bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
963    
964    17. Nobody had reported that the --include_dir option, which was added in
965        release 7.7 should have been called --include-dir (hyphen, not underscore)
966        for compatibility with GNU grep. I have changed it to --include-dir, but
967        left --include_dir as an undocumented synonym, and the same for
968        --exclude-dir, though that is not available in GNU grep, at least as of
969        release 2.5.4.
970    
971    18. At a user's suggestion, the macros GETCHAR and friends (which pick up UTF-8
972        characters from a string of bytes) have been redefined so as not to use
973        loops, in order to improve performance in some environments. At the same
974        time, I abstracted some of the common code into auxiliary macros to save
975        repetition (this should not affect the compiled code).
976    
977    19. If \c was followed by a multibyte UTF-8 character, bad things happened. A
978        compile-time error is now given if \c is not followed by an ASCII
979        character, that is, a byte less than 128. (In EBCDIC mode, the code is
980        different, and any byte value is allowed.)
981    
982    20. Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
983        START_OPTIMIZE option, which is now allowed at compile time - but just
984        passed through to pcre_exec() or pcre_dfa_exec(). This makes it available
985        to pcregrep and other applications that have no direct access to PCRE
986        options. The new /Y option in pcretest sets this option when calling
987        pcre_compile().
988    
989    21. Change 18 of release 8.01 broke the use of named subpatterns for recursive
990        back references. Groups containing recursive back references were forced to
991        be atomic by that change, but in the case of named groups, the amount of
992        memory required was incorrectly computed, leading to "Failed: internal
993        error: code overflow". This has been fixed.
994    
995    22. Some patches to pcre_stringpiece.h, pcre_stringpiece_unittest.cc, and
996        pcretest.c, to avoid build problems in some Borland environments.
997    
998    
999    Version 8.10 25-Jun-2010
1000    ------------------------
1001    
1002    1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
1003        THEN.
1004    
1005    2.  (*ACCEPT) was not working when inside an atomic group.
1006    
1007    3.  Inside a character class, \B is treated as a literal by default, but
1008        faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
1009        causes the error). The code is unchanged, but I tidied the documentation.
1010    
1011    4.  Inside a character class, PCRE always treated \R and \X as literals,
1012        whereas Perl faults them if its -w option is set. I have changed PCRE so
1013        that it faults them when PCRE_EXTRA is set.
1014    
1015    5.  Added support for \N, which always matches any character other than
1016        newline. (It is the same as "." when PCRE_DOTALL is not set.)
1017    
1018    6.  When compiling pcregrep with newer versions of gcc which may have
1019        FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
1020        declared with attribute warn_unused_result" were given. Just casting the
1021        result to (void) does not stop the warnings; a more elaborate fudge is
1022        needed. I've used a macro to implement this.
1023    
1024    7.  Minor change to pcretest.c to avoid a compiler warning.
1025    
1026    8.  Added four artifical Unicode properties to help with an option to make
1027        \s etc use properties (see next item). The new properties are: Xan
1028        (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
1029    
1030    9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
1031        use Unicode properties. (*UCP) at the start of a pattern can be used to set
1032        this option. Modified pcretest to add /W to test this facility. Added
1033        REG_UCP to make it available via the POSIX interface.
1034    
1035    10. Added --line-buffered to pcregrep.
1036    
1037    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
1038        studied, and the match started with a letter with a code point greater than
1039        127 whose first byte was different to the first byte of the other case of
1040        the letter, the other case of this starting letter was not recognized
1041        (#976).
1042    
1043    12. If a pattern that was studied started with a repeated Unicode property
1044        test, for example, \p{Nd}+, there was the theoretical possibility of
1045        setting up an incorrect bitmap of starting bytes, but fortunately it could
1046        not have actually happened in practice until change 8 above was made (it
1047        added property types that matched character-matching opcodes).
1048    
1049    13. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
1050        possible starting bytes for non-anchored patterns.
1051    
1052    14. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes
1053        \R, and also a number of cases that involve Unicode properties, both
1054        explicit and implicit when PCRE_UCP is set.
1055    
1056    15. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
1057        input, it could crash or give wrong results if characters with values
1058        greater than 0xc0 were present in the subject string. (Detail: it assumed
1059        UTF-8 input when processing these items.)
1060    
1061    16. Added a lot of (int) casts to avoid compiler warnings in systems where
1062        size_t is 64-bit (#991).
1063    
1064    17. Added a check for running out of memory when PCRE is compiled with
1065        --disable-stack-for-recursion (#990).
1066    
1067    18. If the last data line in a file for pcretest does not have a newline on
1068        the end, a newline was missing in the output.
1069    
1070    19. The default pcre_chartables.c file recognizes only ASCII characters (values
1071        less than 128) in its various bitmaps. However, there is a facility for
1072        generating tables according to the current locale when PCRE is compiled. It
1073        turns out that in some environments, 0x85 and 0xa0, which are Unicode space
1074        characters, are recognized by isspace() and therefore were getting set in
1075        these tables, and indeed these tables seem to approximate to ISO 8859. This
1076        caused a problem in UTF-8 mode when pcre_study() was used to create a list
1077        of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
1078        which of course cannot start UTF-8 characters. I have changed the code so
1079        that only real ASCII characters (less than 128) and the correct starting
1080        bytes for UTF-8 encodings are set for characters greater than 127 when in
1081        UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
1082        altogether.)
1083    
1084    20. Added the /T option to pcretest so as to be able to run tests with non-
1085        standard character tables, thus making it possible to include the tests
1086        used for 19 above in the standard set of tests.
1087    
1088    21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
1089        reference to a subpattern the other side of a comment that contains an
1090        opening parenthesis caused either an internal compiling error, or a
1091        reference to the wrong subpattern.
1092    
1093    
1094    Version 8.02 19-Mar-2010
1095  ------------------------  ------------------------
1096    
1097  1.  The Unicode data tables have been updated to Unicode 5.2.0.  1.  The Unicode data tables have been updated to Unicode 5.2.0.
1098    
1099  2.  Added the option --libs-cpp to pcre-config, but only when C++ support is  2.  Added the option --libs-cpp to pcre-config, but only when C++ support is
1100      configured.      configured.
1101    
1102  3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the  3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the
1103      original author of that file, following a query about its status.      original author of that file, following a query about its status.
1104    
1105  4.  On systems that do not have stdint.h (e.g. Solaris), check for and include  4.  On systems that do not have stdint.h (e.g. Solaris), check for and include
1106      inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.      inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.
1107    
1108  5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive  5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
1109      quantifier applied to a forward-referencing subroutine call, could compile      quantifier applied to a forward-referencing subroutine call, could compile
1110      incorrect code or give the error "internal error: previously-checked      incorrect code or give the error "internal error: previously-checked
1111      referenced subpattern not found".      referenced subpattern not found".
1112    
1113  6.  Both MS Visual Studio and Symbian OS have problems with initializing  6.  Both MS Visual Studio and Symbian OS have problems with initializing
1114      variables to point to external functions. For these systems, therefore,      variables to point to external functions. For these systems, therefore,
1115      pcre_malloc etc. are now initialized to local functions that call the      pcre_malloc etc. are now initialized to local functions that call the
1116      relevant global functions.      relevant global functions.
1117    
1118  7.  There were two entries missing in the vectors called coptable and poptable  7.  There were two entries missing in the vectors called coptable and poptable
1119      in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.      in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.
1120      I've fixed the data, and added a kludgy way of testing at compile time that      I've fixed the data, and added a kludgy way of testing at compile time that
1121      the lengths are correct (equal to the number of opcodes).      the lengths are correct (equal to the number of opcodes).
1122    
1123  8.  Following on from 7, I added a similar kludge to check the length of the  8.  Following on from 7, I added a similar kludge to check the length of the
1124      eint vector in pcreposix.c.      eint vector in pcreposix.c.
1125    
1126  9.  Error texts for pcre_compile() are held as one long string to avoid too  9.  Error texts for pcre_compile() are held as one long string to avoid too
1127      much relocation at load time. To find a text, the string is searched,      much relocation at load time. To find a text, the string is searched,
1128      counting zeros. There was no check for running off the end of the string,      counting zeros. There was no check for running off the end of the string,
1129      which could happen if a new error number was added without updating the      which could happen if a new error number was added without updating the
1130      string.      string.
1131    
1132  10. \K gave a compile-time error if it appeared in a lookbehind assersion.  10. \K gave a compile-time error if it appeared in a lookbehind assersion.
1133    
1134  11. \K was not working if it appeared in an atomic group or in a group that  11. \K was not working if it appeared in an atomic group or in a group that
1135      was called as a "subroutine", or in an assertion. Perl 5.11 documents that      was called as a "subroutine", or in an assertion. Perl 5.11 documents that
1136      \K is "not well defined" if used in an assertion. PCRE now accepts it if      \K is "not well defined" if used in an assertion. PCRE now accepts it if
1137      the assertion is positive, but not if it is negative.      the assertion is positive, but not if it is negative.
1138    
1139  12. Change 11 fortuitously reduced the size of the stack frame used in the  12. Change 11 fortuitously reduced the size of the stack frame used in the
1140      "match()" function of pcre_exec.c by one pointer. Forthcoming      "match()" function of pcre_exec.c by one pointer. Forthcoming
1141      implementation of support for (*MARK) will need an extra pointer on the      implementation of support for (*MARK) will need an extra pointer on the
1142      stack; I have reserved it now, so that the stack frame size does not      stack; I have reserved it now, so that the stack frame size does not
1143      decrease.      decrease.
1144    
1145  13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other  13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other
1146      item in branch that calls a recursion is a subroutine call - as in the      item in branch that calls a recursion is a subroutine call - as in the
1147      second branch in the above example - was incorrectly given the compile-      second branch in the above example - was incorrectly given the compile-
1148      time error "recursive call could loop indefinitely" because pcre_compile()      time error "recursive call could loop indefinitely" because pcre_compile()
1149      was not correctly checking the subroutine for matching a non-empty string.      was not correctly checking the subroutine for matching a non-empty string.
1150    
1151  14. The checks for overrunning compiling workspace could trigger after an  14. The checks for overrunning compiling workspace could trigger after an
1152      overrun had occurred. This is a "should never occur" error, but it can be      overrun had occurred. This is a "should never occur" error, but it can be
1153      triggered by pathological patterns such as hundreds of nested parentheses.      triggered by pathological patterns such as hundreds of nested parentheses.
1154      The checks now trigger 100 bytes before the end of the workspace.      The checks now trigger 100 bytes before the end of the workspace.
1155    
1156    15. Fix typo in configure.ac: "srtoq" should be "strtoq".
1157    
1158    
1159  Version 8.01 19-Jan-2010  Version 8.01 19-Jan-2010

Legend:
Removed from v.505  
changed lines
  Added in v.1187

  ViewVC Help
Powered by ViewVC 1.1.5