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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.10 03 May-2010  Version 8.31
5    -----------------------------
6    
7    1.  Fixing a wrong JIT test case and some compiler warnings.
8    
9    2.  Removed a bashism from the RunTest script.
10    
11    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
12        to unsigned type, result still unsigned" that was given by an MS compiler
13        on encountering the code "-sizeof(xxx)".
14    
15    4.  Partial matching support is added to the JIT compiler.
16    
17    5.  Fixed several bugs concerned with partial matching of items that consist
18        of more than one character:
19    
20        (a) /^(..)\1/ did not partially match "aba" because checking references was
21            done on an "all or nothing" basis. This also applied to repeated
22            references.
23    
24        (b) \R did not give a hard partial match if \r was found at the end of the
25            subject.
26    
27        (c) \X did not give a hard partial match after matching one or more
28            characters at the end of the subject.
29    
30        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
31            a partial match for the string "\r".
32    
33        (e) When newline was set to CRLF, the metacharacter "." did not recognize
34            a partial match for a CR character at the end of the subject string.
35    
36    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
37        running pcretest, the text "(JIT)" added to the output whenever JIT is
38        actually used to run the match.
39    
40    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
41        or /S+[+] with a digit between 1 and 7.
42    
43    8.  OP_NOT now supports any UTF character not just single-byte ones.
44    
45    9.  (*MARK) control verb is now supported by the JIT compiler.
46    
47    10. The command "./RunTest list" lists the available tests without actually
48        running any of them. (Because I keep forgetting what they all are.)
49    
50    11. Add PCRE_INFO_MAXLOOKBEHIND.
51    
52    12. Applied a (slightly modified) user-supplied patch that improves performance
53        when the heap is used for recursion (compiled with --disable-stack-for-
54        recursion). Instead of malloc and free for each heap frame each time a
55        logical recursion happens, frames are retained on a chain and re-used where
56        possible. This sometimes gives as much as 30% improvement.
57    
58    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
59        call.
60    
61    14. As documented, (*COMMIT) is now confined to within a positive assertion.
62    
63    15. It is now possible to link pcretest with libedit as an alternative to
64        libreadline.
65    
66    16. (*COMMIT) control verb is now supported by the JIT compiler.
67    
68    17. The Unicode data tables have been updated to Unicode 6.1.0.
69    
70    18. Added --file-list option to pcregrep.
71    
72    19. Added binary file support to pcregrep, including the -a, --binary-files,
73        -I, and --text options.
74    
75    20. The madvise function is renamed for posix_madvise for QNX compatibility
76        reasons. Fixed by Giuseppe D'Angelo.
77    
78    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
79    
80    
81    Version 8.30 04-February-2012
82    -----------------------------
83    
84    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
85        name is defined in ctype.h.
86    
87    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
88        only in quite long subpatterns.
89    
90    3.  Removed the function pcre_info(), which has been obsolete and deprecated
91        since it was replaced by pcre_fullinfo() in February 2000.
92    
93    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
94        match a (*MARK), and the match failed at the start of the subject, a
95        reference to memory before the start of the subject could occur. This bug
96        was introduced by fix 17 of release 8.21.
97    
98    5.  A reference to an unset group with zero minimum repetition was giving
99        totally wrong answers (in non-JavaScript-compatibility mode). For example,
100        /(another)?(\1?)test/ matched against "hello world test". This bug was
101        introduced in release 8.13.
102    
103    6.  Add support for 16-bit character strings (a large amount of work involving
104        many changes and refactorings).
105    
106    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
107        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
108        from a file.
109    
110    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
111        rounding is not applied in this particular case).
112    
113    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
114        if they appear, or are escaped, in patterns.
115    
116    10. Get rid of a number of -Wunused-but-set-variable warnings.
117    
118    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
119        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
120        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
121        also returns the mark "x". This bug applied to capturing parentheses,
122        non-capturing parentheses, and atomic parentheses. It also applied to some
123        assertions.
124    
125    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
126        information out of configure.ac instead of relying on pcre.h.generic, which
127        is not stored in the repository.
128    
129    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
130        -lreadline.
131    
132    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
133    
134    15. Applied Graycode's patch to put the top-level frame on the stack rather
135        than the heap when not using the stack for recursion. This gives a
136        performance improvement in many cases when recursion is not deep.
137    
138    16. Experimental code added to "pcretest -C" to output the stack frame size.
139    
140    
141    Version 8.21 12-Dec-2011
142    ------------------------
143    
144    1.  Updating the JIT compiler.
145    
146    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
147        are added as well.
148    
149    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
150        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
151        calling _pcre_jit_exec. Some extra comments are added.
152    
153    4.  (*MARK) settings inside atomic groups that do not contain any capturing
154        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
155        was introduced by change 18 for 8.20.
156    
157    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
158        ECMA-262 standard.
159    
160    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
161        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
162        This bug was probably introduced by change 9 of 8.13.
163    
164    7.  While fixing 6 above, I noticed that a number of other items were being
165        incorrectly rejected as "not fixed length". This arose partly because newer
166        opcodes had not been added to the fixed-length checking code. I have (a)
167        corrected the bug and added tests for these items, and (b) arranged for an
168        error to occur if an unknown opcode is encountered while checking for fixed
169        length instead of just assuming "not fixed length". The items that were
170        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
171        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
172        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
173    
174    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
175        being incorrectly compiled and would have given unpredicatble results.
176    
177    9.  A possessively repeated subpattern with minimum repeat count greater than
178        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
179        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
180        the first (A) could occur when it should not.
181    
182    10. Add a cast and remove a redundant test from the code.
183    
184    11. JIT should use pcre_malloc/pcre_free for allocation.
185    
186    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
187        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
188        is anything other than /usr, -L is still shown).
189    
190    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
191    
192    14. Perl does not support \N without a following name in a [] class; PCRE now
193        also gives an error.
194    
195    15. If a forward reference was repeated with an upper limit of around 2000,
196        it caused the error "internal error: overran compiling workspace". The
197        maximum number of forward references (including repeats) was limited by the
198        internal workspace, and dependent on the LINK_SIZE. The code has been
199        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
200        the default depends on LINK_SIZE. There is a new upper limit (for safety)
201        of around 200,000 forward references. While doing this, I also speeded up
202        the filling in of repeated forward references.
203    
204    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
205        incorrectly expecting the subject to contain another "a" after the start.
206    
207    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
208        in the match, the SKIP should be ignored. This was not happening; instead
209        the SKIP was being treated as NOMATCH. For patterns such as
210        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
211        tested.
212    
213    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
214        now much more compatible with Perl, in particular in cases where the result
215        is a non-match for a non-anchored pattern. For example, if
216        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
217        "m", where previously it did not return a name. A side effect of this
218        change is that for partial matches, the last encountered mark name is
219        returned, as for non matches. A number of tests that were previously not
220        Perl-compatible have been moved into the Perl-compatible test files. The
221        refactoring has had the pleasing side effect of removing one argument from
222        the match() function, thus reducing its stack requirements.
223    
224    19. If the /S+ option was used in pcretest to study a pattern using JIT,
225        subsequent uses of /S (without +) incorrectly behaved like /S+.
226    
227    21. Retrieve executable code size support for the JIT compiler and fixing
228        some warnings.
229    
230    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
231        not work when the shorter character appeared right at the end of the
232        subject string.
233    
234    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
235        systems.
236    
237    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
238        output it when the /M option is used in pcretest.
239    
240    25. The CheckMan script was not being included in the distribution. Also, added
241        an explicit "perl" to run Perl scripts from the PrepareRelease script
242        because this is reportedly needed in Windows.
243    
244    26. If study data was being save in a file and studying had not found a set of
245        "starts with" bytes for the pattern, the data written to the file (though
246        never used) was taken from uninitialized memory and so caused valgrind to
247        complain.
248    
249    27. Updated RunTest.bat as provided by Sheri Pierce.
250    
251    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
252    
253    29. Computation of memory usage for the table of capturing group names was
254        giving an unnecessarily large value.
255    
256    
257    Version 8.20 21-Oct-2011
258    ------------------------
259    
260    1.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had
261        a POSIX class. After further experiments with Perl, which convinced me that
262        Perl has bugs and confusions, a closing square bracket is no longer allowed
263        in a POSIX name. This bug also affected patterns with classes that started
264        with full stops.
265    
266    2.  If a pattern such as /(a)b|ac/ is matched against "ac", there is no
267        captured substring, but while checking the failing first alternative,
268        substring 1 is temporarily captured. If the output vector supplied to
269        pcre_exec() was not big enough for this capture, the yield of the function
270        was still zero ("insufficient space for captured substrings"). This cannot
271        be totally fixed without adding another stack variable, which seems a lot
272        of expense for a edge case. However, I have improved the situation in cases
273        such as /(a)(b)x|abc/ matched against "abc", where the return code
274        indicates that fewer than the maximum number of slots in the ovector have
275        been set.
276    
277    3.  Related to (2) above: when there are more back references in a pattern than
278        slots in the output vector, pcre_exec() uses temporary memory during
279        matching, and copies in the captures as far as possible afterwards. It was
280        using the entire output vector, but this conflicts with the specification
281        that only 2/3 is used for passing back captured substrings. Now it uses
282        only the first 2/3, for compatibility. This is, of course, another edge
283        case.
284    
285    4.  Zoltan Herczeg's just-in-time compiler support has been integrated into the
286        main code base, and can be used by building with --enable-jit. When this is
287        done, pcregrep automatically uses it unless --disable-pcregrep-jit or the
288        runtime --no-jit option is given.
289    
290    5.  When the number of matches in a pcre_dfa_exec() run exactly filled the
291        ovector, the return from the function was zero, implying that there were
292        other matches that did not fit. The correct "exactly full" value is now
293        returned.
294    
295    6.  If a subpattern that was called recursively or as a subroutine contained
296        (*PRUNE) or any other control that caused it to give a non-standard return,
297        invalid errors such as "Error -26 (nested recursion at the same subject
298        position)" or even infinite loops could occur.
299    
300    7.  If a pattern such as /a(*SKIP)c|b(*ACCEPT)|/ was studied, it stopped
301        computing the minimum length on reaching *ACCEPT, and so ended up with the
302        wrong value of 1 rather than 0. Further investigation indicates that
303        computing a minimum subject length in the presence of *ACCEPT is difficult
304        (think back references, subroutine calls), and so I have changed the code
305        so that no minimum is registered for a pattern that contains *ACCEPT.
306    
307    8.  If (*THEN) was present in the first (true) branch of a conditional group,
308        it was not handled as intended. [But see 16 below.]
309    
310    9.  Replaced RunTest.bat and CMakeLists.txt with improved versions provided by
311        Sheri Pierce.
312    
313    10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that
314        the first byte in a match must be "a".
315    
316    11. Change 17 for 8.13 increased the recursion depth for patterns like
317        /a(?:.)*?a/ drastically. I've improved things by remembering whether a
318        pattern contains any instances of (*THEN). If it does not, the old
319        optimizations are restored. It would be nice to do this on a per-group
320        basis, but at the moment that is not feasible.
321    
322    12. In some environments, the output of pcretest -C is CRLF terminated. This
323        broke RunTest's code that checks for the link size. A single white space
324        character after the value is now allowed for.
325    
326    13. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".
327        For "fr", it uses the Windows-specific input and output files.
328    
329    14. If (*THEN) appeared in a group that was called recursively or as a
330        subroutine, it did not work as intended. [But see next item.]
331    
332    15. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex
333        pattern fragments (but not containing any | characters). If A and B are
334        matched, but there is a failure in C so that it backtracks to (*THEN), PCRE
335        was behaving differently to Perl. PCRE backtracked into A, but Perl goes to
336        D. In other words, Perl considers parentheses that do not contain any |
337        characters to be part of a surrounding alternative, whereas PCRE was
338        treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles
339        differently. PCRE now behaves in the same way as Perl, except in the case
340        of subroutine/recursion calls such as (?1) which have in any case always
341        been different (but PCRE had them first :-).
342    
343    16. Related to 15 above: Perl does not treat the | in a conditional group as
344        creating alternatives. Such a group is treated in the same way as an
345        ordinary group without any | characters when processing (*THEN). PCRE has
346        been changed to match Perl's behaviour.
347    
348    17. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the
349        RunGrepTest script failed.
350    
351    18. Change 22 for version 13 caused atomic groups to use more stack. This is
352        inevitable for groups that contain captures, but it can lead to a lot of
353        stack use in large patterns. The old behaviour has been restored for atomic
354        groups that do not contain any capturing parentheses.
355    
356    19. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not
357        suppress the check for a minimum subject length at run time. (If it was
358        given to pcre_exec() or pcre_dfa_exec() it did work.)
359    
360    20. Fixed an ASCII-dependent infelicity in pcretest that would have made it
361        fail to work when decoding hex characters in data strings in EBCDIC
362        environments.
363    
364    21. It appears that in at least one Mac OS environment, the isxdigit() function
365        is implemented as a macro that evaluates to its argument more than once,
366        contravening the C 90 Standard (I haven't checked a later standard). There
367        was an instance in pcretest which caused it to go wrong when processing
368        \x{...} escapes in subject strings. The has been rewritten to avoid using
369        things like p++ in the argument of isxdigit().
370    
371    
372    Version 8.13 16-Aug-2011
373    ------------------------
374    
375    1.  The Unicode data tables have been updated to Unicode 6.0.0.
376    
377    2.  Two minor typos in pcre_internal.h have been fixed.
378    
379    3.  Added #include <string.h> to pcre_scanner_unittest.cc, pcrecpp.cc, and
380        pcrecpp_unittest.cc. They are needed for strcmp(), memset(), and strchr()
381        in some environments (e.g. Solaris 10/SPARC using Sun Studio 12U2).
382    
383    4.  There were a number of related bugs in the code for matching backrefences
384        caselessly in UTF-8 mode when codes for the characters concerned were
385        different numbers of bytes. For example, U+023A and U+2C65 are an upper
386        and lower case pair, using 2 and 3 bytes, respectively. The main bugs were:
387        (a) A reference to 3 copies of a 2-byte code matched only 2 of a 3-byte
388        code. (b) A reference to 2 copies of a 3-byte code would not match 2 of a
389        2-byte code at the end of the subject (it thought there wasn't enough data
390        left).
391    
392    5.  Comprehensive information about what went wrong is now returned by
393        pcre_exec() and pcre_dfa_exec() when the UTF-8 string check fails, as long
394        as the output vector has at least 2 elements. The offset of the start of
395        the failing character and a reason code are placed in the vector.
396    
397    6.  When the UTF-8 string check fails for pcre_compile(), the offset that is
398        now returned is for the first byte of the failing character, instead of the
399        last byte inspected. This is an incompatible change, but I hope it is small
400        enough not to be a problem. It makes the returned offset consistent with
401        pcre_exec() and pcre_dfa_exec().
402    
403    7.  pcretest now gives a text phrase as well as the error number when
404        pcre_exec() or pcre_dfa_exec() fails; if the error is a UTF-8 check
405        failure, the offset and reason code are output.
406    
407    8.  When \R was used with a maximizing quantifier it failed to skip backwards
408        over a \r\n pair if the subsequent match failed. Instead, it just skipped
409        back over a single character (\n). This seems wrong (because it treated the
410        two characters as a single entity when going forwards), conflicts with the
411        documentation that \R is equivalent to (?>\r\n|\n|...etc), and makes the
412        behaviour of \R* different to (\R)*, which also seems wrong. The behaviour
413        has been changed.
414    
415    9.  Some internal refactoring has changed the processing so that the handling
416        of the PCRE_CASELESS and PCRE_MULTILINE options is done entirely at compile
417        time (the PCRE_DOTALL option was changed this way some time ago: version
418        7.7 change 16). This has made it possible to abolish the OP_OPT op code,
419        which was always a bit of a fudge. It also means that there is one less
420        argument for the match() function, which reduces its stack requirements
421        slightly. This change also fixes an incompatibility with Perl: the pattern
422        (?i:([^b]))(?1) should not match "ab", but previously PCRE gave a match.
423    
424    10. More internal refactoring has drastically reduced the number of recursive
425        calls to match() for possessively repeated groups such as (abc)++ when
426        using pcre_exec().
427    
428    11. While implementing 10, a number of bugs in the handling of groups were
429        discovered and fixed:
430    
431        (?<=(a)+) was not diagnosed as invalid (non-fixed-length lookbehind).
432        (a|)*(?1) gave a compile-time internal error.
433        ((a|)+)+  did not notice that the outer group could match an empty string.
434        (^a|^)+   was not marked as anchored.
435        (.*a|.*)+ was not marked as matching at start or after a newline.
436    
437    12. Yet more internal refactoring has removed another argument from the match()
438        function. Special calls to this function are now indicated by setting a
439        value in a variable in the "match data" data block.
440    
441    13. Be more explicit in pcre_study() instead of relying on "default" for
442        opcodes that mean there is no starting character; this means that when new
443        ones are added and accidentally left out of pcre_study(), testing should
444        pick them up.
445    
446    14. The -s option of pcretest has been documented for ages as being an old
447        synonym of -m (show memory usage). I have changed it to mean "force study
448        for every regex", that is, assume /S for every regex. This is similar to -i
449        and -d etc. It's slightly incompatible, but I'm hoping nobody is still
450        using it. It makes it easier to run collections of tests with and without
451        study enabled, and thereby test pcre_study() more easily. All the standard
452        tests are now run with and without -s (but some patterns can be marked as
453        "never study" - see 20 below).
454    
455    15. When (*ACCEPT) was used in a subpattern that was called recursively, the
456        restoration of the capturing data to the outer values was not happening
457        correctly.
458    
459    16. If a recursively called subpattern ended with (*ACCEPT) and matched an
460        empty string, and PCRE_NOTEMPTY was set, pcre_exec() thought the whole
461        pattern had matched an empty string, and so incorrectly returned a no
462        match.
463    
464    17. There was optimizing code for the last branch of non-capturing parentheses,
465        and also for the obeyed branch of a conditional subexpression, which used
466        tail recursion to cut down on stack usage. Unfortunately, now that there is
467        the possibility of (*THEN) occurring in these branches, tail recursion is
468        no longer possible because the return has to be checked for (*THEN). These
469        two optimizations have therefore been removed. [But see 8.20/11 above.]
470    
471    18. If a pattern containing \R was studied, it was assumed that \R always
472        matched two bytes, thus causing the minimum subject length to be
473        incorrectly computed because \R can also match just one byte.
474    
475    19. If a pattern containing (*ACCEPT) was studied, the minimum subject length
476        was incorrectly computed.
477    
478    20. If /S is present twice on a test pattern in pcretest input, it now
479        *disables* studying, thereby overriding the use of -s on the command line
480        (see 14 above). This is necessary for one or two tests to keep the output
481        identical in both cases.
482    
483    21. When (*ACCEPT) was used in an assertion that matched an empty string and
484        PCRE_NOTEMPTY was set, PCRE applied the non-empty test to the assertion.
485    
486    22. When an atomic group that contained a capturing parenthesis was
487        successfully matched, but the branch in which it appeared failed, the
488        capturing was not being forgotten if a higher numbered group was later
489        captured. For example, /(?>(a))b|(a)c/ when matching "ac" set capturing
490        group 1 to "a", when in fact it should be unset. This applied to multi-
491        branched capturing and non-capturing groups, repeated or not, and also to
492        positive assertions (capturing in negative assertions does not happen
493        in PCRE) and also to nested atomic groups.
494    
495    23. Add the ++ qualifier feature to pcretest, to show the remainder of the
496        subject after a captured substring, to make it easier to tell which of a
497        number of identical substrings has been captured.
498    
499    24. The way atomic groups are processed by pcre_exec() has been changed so that
500        if they are repeated, backtracking one repetition now resets captured
501        values correctly. For example, if ((?>(a+)b)+aabab) is matched against
502        "aaaabaaabaabab" the value of captured group 2 is now correctly recorded as
503        "aaa". Previously, it would have been "a". As part of this code
504        refactoring, the way recursive calls are handled has also been changed.
505    
506    25. If an assertion condition captured any substrings, they were not passed
507        back unless some other capturing happened later. For example, if
508        (?(?=(a))a) was matched against "a", no capturing was returned.
509    
510    26. When studying a pattern that contained subroutine calls or assertions,
511        the code for finding the minimum length of a possible match was handling
512        direct recursions such as (xxx(?1)|yyy) but not mutual recursions (where
513        group 1 called group 2 while simultaneously a separate group 2 called group
514        1). A stack overflow occurred in this case. I have fixed this by limiting
515        the recursion depth to 10.
516    
517    27. Updated RunTest.bat in the distribution to the version supplied by Tom
518        Fortmann. This supports explicit test numbers on the command line, and has
519        argument validation and error reporting.
520    
521    28. An instance of \X with an unlimited repeat could fail if at any point the
522        first character it looked at was a mark character.
523    
524    29. Some minor code refactoring concerning Unicode properties and scripts
525        should reduce the stack requirement of match() slightly.
526    
527    30. Added the '=' option to pcretest to check the setting of unused capturing
528        slots at the end of the pattern, which are documented as being -1, but are
529        not included in the return count.
530    
531    31. If \k was not followed by a braced, angle-bracketed, or quoted name, PCRE
532        compiled something random. Now it gives a compile-time error (as does
533        Perl).
534    
535    32. A *MARK encountered during the processing of a positive assertion is now
536        recorded and passed back (compatible with Perl).
537    
538    33. If --only-matching or --colour was set on a pcregrep call whose pattern
539        had alternative anchored branches, the search for a second match in a line
540        was done as if at the line start. Thus, for example, /^01|^02/ incorrectly
541        matched the line "0102" twice. The same bug affected patterns that started
542        with a backwards assertion. For example /\b01|\b02/ also matched "0102"
543        twice.
544    
545    34. Previously, PCRE did not allow quantification of assertions. However, Perl
546        does, and because of capturing effects, quantifying parenthesized
547        assertions may at times be useful. Quantifiers are now allowed for
548        parenthesized assertions.
549    
550    35. A minor code tidy in pcre_compile() when checking options for \R usage.
551    
552    36. \g was being checked for fancy things in a character class, when it should
553        just be a literal "g".
554    
555    37. PCRE was rejecting [:a[:digit:]] whereas Perl was not. It seems that the
556        appearance of a nested POSIX class supersedes an apparent external class.
557        For example, [:a[:digit:]b:] matches "a", "b", ":", or a digit. Also,
558        unescaped square brackets may also appear as part of class names. For
559        example, [:a[:abc]b:] gives unknown class "[:abc]b:]". PCRE now behaves
560        more like Perl. (But see 8.20/1 above.)
561    
562    38. PCRE was giving an error for \N with a braced quantifier such as {1,} (this
563        was because it thought it was \N{name}, which is not supported).
564    
565    39. Add minix to OS list not supporting the -S option in pcretest.
566    
567    40. PCRE tries to detect cases of infinite recursion at compile time, but it
568        cannot analyze patterns in sufficient detail to catch mutual recursions
569        such as ((?1))((?2)). There is now a runtime test that gives an error if a
570        subgroup is called recursively as a subpattern for a second time at the
571        same position in the subject string. In previous releases this might have
572        been caught by the recursion limit, or it might have run out of stack.
573    
574    41. A pattern such as /(?(R)a+|(?R)b)/ is quite safe, as the recursion can
575        happen only once. PCRE was, however incorrectly giving a compile time error
576        "recursive call could loop indefinitely" because it cannot analyze the
577        pattern in sufficient detail. The compile time test no longer happens when
578        PCRE is compiling a conditional subpattern, but actual runaway loops are
579        now caught at runtime (see 40 above).
580    
581    42. It seems that Perl allows any characters other than a closing parenthesis
582        to be part of the NAME in (*MARK:NAME) and other backtracking verbs. PCRE
583        has been changed to be the same.
584    
585    43. Updated configure.ac to put in more quoting round AC_LANG_PROGRAM etc. so
586        as not to get warnings when autogen.sh is called. Also changed
587        AC_PROG_LIBTOOL (deprecated) to LT_INIT (the current macro).
588    
589    44. To help people who use pcregrep to scan files containing exceedingly long
590        lines, the following changes have been made:
591    
592        (a) The default value of the buffer size parameter has been increased from
593            8K to 20K. (The actual buffer used is three times this size.)
594    
595        (b) The default can be changed by ./configure --with-pcregrep-bufsize when
596            PCRE is built.
597    
598        (c) A --buffer-size=n option has been added to pcregrep, to allow the size
599            to be set at run time.
600    
601        (d) Numerical values in pcregrep options can be followed by K or M, for
602            example --buffer-size=50K.
603    
604        (e) If a line being scanned overflows pcregrep's buffer, an error is now
605            given and the return code is set to 2.
606    
607    45. Add a pointer to the latest mark to the callout data block.
608    
609    46. The pattern /.(*F)/, when applied to "abc" with PCRE_PARTIAL_HARD, gave a
610        partial match of an empty string instead of no match. This was specific to
611        the use of ".".
612    
613    47. The pattern /f.*/8s, when applied to "for" with PCRE_PARTIAL_HARD, gave a
614        complete match instead of a partial match. This bug was dependent on both
615        the PCRE_UTF8 and PCRE_DOTALL options being set.
616    
617    48. For a pattern such as /\babc|\bdef/ pcre_study() was failing to set up the
618        starting byte set, because \b was not being ignored.
619    
620    
621    Version 8.12 15-Jan-2011
622    ------------------------
623    
624    1.  Fixed some typos in the markup of the man pages, and wrote a script that
625        checks for such things as part of the documentation building process.
626    
627    2.  On a big-endian 64-bit system, pcregrep did not correctly process the
628        --match-limit and --recursion-limit options (added for 8.11). In
629        particular, this made one of the standard tests fail. (The integer value
630        went into the wrong half of a long int.)
631    
632    3.  If the --colour option was given to pcregrep with -v (invert match), it
633        did strange things, either producing crazy output, or crashing. It should,
634        of course, ignore a request for colour when reporting lines that do not
635        match.
636    
637    4.  Another pcregrep bug caused similar problems if --colour was specified with
638        -M (multiline) and the pattern match finished with a line ending.
639    
640    5.  In pcregrep, when a pattern that ended with a literal newline sequence was
641        matched in multiline mode, the following line was shown as part of the
642        match. This seems wrong, so I have changed it.
643    
644    6.  Another pcregrep bug in multiline mode, when --colour was specified, caused
645        the check for further matches in the same line (so they could be coloured)
646        to overrun the end of the current line. If another match was found, it was
647        incorrectly shown (and then shown again when found in the next line).
648    
649    7.  If pcregrep was compiled under Windows, there was a reference to the
650        function pcregrep_exit() before it was defined. I am assuming this was
651        the cause of the "error C2371: 'pcregrep_exit' : redefinition;" that was
652        reported by a user. I've moved the definition above the reference.
653    
654    
655    Version 8.11 10-Dec-2010
656    ------------------------
657    
658    1.  (*THEN) was not working properly if there were untried alternatives prior
659        to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
660        backtracked to try for "b" instead of moving to the next alternative branch
661        at the same level (in this case, to look for "c"). The Perl documentation
662        is clear that when (*THEN) is backtracked onto, it goes to the "next
663        alternative in the innermost enclosing group".
664    
665    2.  (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
666        such as   (A(*COMMIT)B(*THEN)C|D)  any failure after matching A should
667        result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
668        (*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
669        (*THEN).
670    
671    3.  If \s appeared in a character class, it removed the VT character from
672        the class, even if it had been included by some previous item, for example
673        in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
674        of \s, but is part of the POSIX "space" class.)
675    
676    4.  A partial match never returns an empty string (because you can always
677        match an empty string at the end of the subject); however the checking for
678        an empty string was starting at the "start of match" point. This has been
679        changed to the "earliest inspected character" point, because the returned
680        data for a partial match starts at this character. This means that, for
681        example, /(?<=abc)def/ gives a partial match for the subject "abc"
682        (previously it gave "no match").
683    
684    5.  Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
685        of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
686        previously a full match would be given. However, setting PCRE_PARTIAL_HARD
687        has an implication that the given string is incomplete (because a partial
688        match is preferred over a full match). For this reason, these items now
689        give a partial match in this situation. [Aside: previously, the one case
690        /t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
691        match rather than a full match, which was wrong by the old rules, but is
692        now correct.]
693    
694    6.  There was a bug in the handling of #-introduced comments, recognized when
695        PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
696        If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
697        UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
698        scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
699        but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
700        places in pcre_compile().
701    
702    7.  Related to (6) above, when pcre_compile() was skipping #-introduced
703        comments when looking ahead for named forward references to subpatterns,
704        the only newline sequence it recognized was NL. It now handles newlines
705        according to the set newline convention.
706    
707    8.  SunOS4 doesn't have strerror() or strtoul(); pcregrep dealt with the
708        former, but used strtoul(), whereas pcretest avoided strtoul() but did not
709        cater for a lack of strerror(). These oversights have been fixed.
710    
711    9.  Added --match-limit and --recursion-limit to pcregrep.
712    
713    10. Added two casts needed to build with Visual Studio when NO_RECURSE is set.
714    
715    11. When the -o option was used, pcregrep was setting a return code of 1, even
716        when matches were found, and --line-buffered was not being honoured.
717    
718    12. Added an optional parentheses number to the -o and --only-matching options
719        of pcregrep.
720    
721    13. Imitating Perl's /g action for multiple matches is tricky when the pattern
722        can match an empty string. The code to do it in pcretest and pcredemo
723        needed fixing:
724    
725        (a) When the newline convention was "crlf", pcretest got it wrong, skipping
726            only one byte after an empty string match just before CRLF (this case
727            just got forgotten; "any" and "anycrlf" were OK).
728    
729        (b) The pcretest code also had a bug, causing it to loop forever in UTF-8
730            mode when an empty string match preceded an ASCII character followed by
731            a non-ASCII character. (The code for advancing by one character rather
732            than one byte was nonsense.)
733    
734        (c) The pcredemo.c sample program did not have any code at all to handle
735            the cases when CRLF is a valid newline sequence.
736    
737    14. Neither pcre_exec() nor pcre_dfa_exec() was checking that the value given
738        as a starting offset was within the subject string. There is now a new
739        error, PCRE_ERROR_BADOFFSET, which is returned if the starting offset is
740        negative or greater than the length of the string. In order to test this,
741        pcretest is extended to allow the setting of negative starting offsets.
742    
743    15. In both pcre_exec() and pcre_dfa_exec() the code for checking that the
744        starting offset points to the beginning of a UTF-8 character was
745        unnecessarily clumsy. I tidied it up.
746    
747    16. Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
748        bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
749    
750    17. Nobody had reported that the --include_dir option, which was added in
751        release 7.7 should have been called --include-dir (hyphen, not underscore)
752        for compatibility with GNU grep. I have changed it to --include-dir, but
753        left --include_dir as an undocumented synonym, and the same for
754        --exclude-dir, though that is not available in GNU grep, at least as of
755        release 2.5.4.
756    
757    18. At a user's suggestion, the macros GETCHAR and friends (which pick up UTF-8
758        characters from a string of bytes) have been redefined so as not to use
759        loops, in order to improve performance in some environments. At the same
760        time, I abstracted some of the common code into auxiliary macros to save
761        repetition (this should not affect the compiled code).
762    
763    19. If \c was followed by a multibyte UTF-8 character, bad things happened. A
764        compile-time error is now given if \c is not followed by an ASCII
765        character, that is, a byte less than 128. (In EBCDIC mode, the code is
766        different, and any byte value is allowed.)
767    
768    20. Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
769        START_OPTIMIZE option, which is now allowed at compile time - but just
770        passed through to pcre_exec() or pcre_dfa_exec(). This makes it available
771        to pcregrep and other applications that have no direct access to PCRE
772        options. The new /Y option in pcretest sets this option when calling
773        pcre_compile().
774    
775    21. Change 18 of release 8.01 broke the use of named subpatterns for recursive
776        back references. Groups containing recursive back references were forced to
777        be atomic by that change, but in the case of named groups, the amount of
778        memory required was incorrectly computed, leading to "Failed: internal
779        error: code overflow". This has been fixed.
780    
781    22. Some patches to pcre_stringpiece.h, pcre_stringpiece_unittest.cc, and
782        pcretest.c, to avoid build problems in some Borland environments.
783    
784    
785    Version 8.10 25-Jun-2010
786  ------------------------  ------------------------
787    
788  1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and  1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
# Line 9  Version 8.10 03 May-2010 Line 790  Version 8.10 03 May-2010
790    
791  2.  (*ACCEPT) was not working when inside an atomic group.  2.  (*ACCEPT) was not working when inside an atomic group.
792    
793  3.  Inside a character class, \B is treated as a literal by default, but  3.  Inside a character class, \B is treated as a literal by default, but
794      faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option      faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
795      causes the error). The code is unchanged, but I tidied the documentation.      causes the error). The code is unchanged, but I tidied the documentation.
796    
797  4.  Inside a character class, PCRE always treated \R and \X as literals,  4.  Inside a character class, PCRE always treated \R and \X as literals,
798      whereas Perl faults them if its -w option is set. I have changed PCRE so      whereas Perl faults them if its -w option is set. I have changed PCRE so
799      that it faults them when PCRE_EXTRA is set.      that it faults them when PCRE_EXTRA is set.
800    
801    5.  Added support for \N, which always matches any character other than
802        newline. (It is the same as "." when PCRE_DOTALL is not set.)
803    
804    6.  When compiling pcregrep with newer versions of gcc which may have
805        FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
806        declared with attribute warn_unused_result" were given. Just casting the
807        result to (void) does not stop the warnings; a more elaborate fudge is
808        needed. I've used a macro to implement this.
809    
810    7.  Minor change to pcretest.c to avoid a compiler warning.
811    
812    8.  Added four artifical Unicode properties to help with an option to make
813        \s etc use properties (see next item). The new properties are: Xan
814        (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
815    
816    9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
817        use Unicode properties. (*UCP) at the start of a pattern can be used to set
818        this option. Modified pcretest to add /W to test this facility. Added
819        REG_UCP to make it available via the POSIX interface.
820    
821    10. Added --line-buffered to pcregrep.
822    
823    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
824        studied, and the match started with a letter with a code point greater than
825        127 whose first byte was different to the first byte of the other case of
826        the letter, the other case of this starting letter was not recognized
827        (#976).
828    
829    12. If a pattern that was studied started with a repeated Unicode property
830        test, for example, \p{Nd}+, there was the theoretical possibility of
831        setting up an incorrect bitmap of starting bytes, but fortunately it could
832        not have actually happened in practice until change 8 above was made (it
833        added property types that matched character-matching opcodes).
834    
835    13. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
836        possible starting bytes for non-anchored patterns.
837    
838    14. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes
839        \R, and also a number of cases that involve Unicode properties, both
840        explicit and implicit when PCRE_UCP is set.
841    
842    15. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
843        input, it could crash or give wrong results if characters with values
844        greater than 0xc0 were present in the subject string. (Detail: it assumed
845        UTF-8 input when processing these items.)
846    
847    16. Added a lot of (int) casts to avoid compiler warnings in systems where
848        size_t is 64-bit (#991).
849    
850    17. Added a check for running out of memory when PCRE is compiled with
851        --disable-stack-for-recursion (#990).
852    
853    18. If the last data line in a file for pcretest does not have a newline on
854        the end, a newline was missing in the output.
855    
856    19. The default pcre_chartables.c file recognizes only ASCII characters (values
857        less than 128) in its various bitmaps. However, there is a facility for
858        generating tables according to the current locale when PCRE is compiled. It
859        turns out that in some environments, 0x85 and 0xa0, which are Unicode space
860        characters, are recognized by isspace() and therefore were getting set in
861        these tables, and indeed these tables seem to approximate to ISO 8859. This
862        caused a problem in UTF-8 mode when pcre_study() was used to create a list
863        of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
864        which of course cannot start UTF-8 characters. I have changed the code so
865        that only real ASCII characters (less than 128) and the correct starting
866        bytes for UTF-8 encodings are set for characters greater than 127 when in
867        UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
868        altogether.)
869    
870    20. Added the /T option to pcretest so as to be able to run tests with non-
871        standard character tables, thus making it possible to include the tests
872        used for 19 above in the standard set of tests.
873    
874    21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
875        reference to a subpattern the other side of a comment that contains an
876        opening parenthesis caused either an internal compiling error, or a
877        reference to the wrong subpattern.
878    
879    
880  Version 8.02 19-Mar-2010  Version 8.02 19-Mar-2010
881  ------------------------  ------------------------

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