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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.13 30-Apr-2011  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    
51    Version 8.30 04-February-2012
52    -----------------------------
53    
54    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
55        name is defined in ctype.h.
56    
57    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
58        only in quite long subpatterns.
59    
60    3.  Removed the function pcre_info(), which has been obsolete and deprecated
61        since it was replaced by pcre_fullinfo() in February 2000.
62    
63    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
64        match a (*MARK), and the match failed at the start of the subject, a
65        reference to memory before the start of the subject could occur. This bug
66        was introduced by fix 17 of release 8.21.
67    
68    5.  A reference to an unset group with zero minimum repetition was giving
69        totally wrong answers (in non-JavaScript-compatibility mode). For example,
70        /(another)?(\1?)test/ matched against "hello world test". This bug was
71        introduced in release 8.13.
72    
73    6.  Add support for 16-bit character strings (a large amount of work involving
74        many changes and refactorings).
75    
76    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
77        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
78        from a file.
79    
80    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
81        rounding is not applied in this particular case).
82    
83    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
84        if they appear, or are escaped, in patterns.
85    
86    10. Get rid of a number of -Wunused-but-set-variable warnings.
87    
88    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
89        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
90        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
91        also returns the mark "x". This bug applied to capturing parentheses,
92        non-capturing parentheses, and atomic parentheses. It also applied to some
93        assertions.
94    
95    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
96        information out of configure.ac instead of relying on pcre.h.generic, which
97        is not stored in the repository.
98    
99    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
100        -lreadline.
101    
102    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
103    
104    15. Applied Graycode's patch to put the top-level frame on the stack rather
105        than the heap when not using the stack for recursion. This gives a
106        performance improvement in many cases when recursion is not deep.
107    
108    16. Experimental code added to "pcretest -C" to output the stack frame size.
109    
110    
111    Version 8.21 12-Dec-2011
112    ------------------------
113    
114    1.  Updating the JIT compiler.
115    
116    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
117        are added as well.
118    
119    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
120        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
121        calling _pcre_jit_exec. Some extra comments are added.
122    
123    4.  (*MARK) settings inside atomic groups that do not contain any capturing
124        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
125        was introduced by change 18 for 8.20.
126    
127    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
128        ECMA-262 standard.
129    
130    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
131        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
132        This bug was probably introduced by change 9 of 8.13.
133    
134    7.  While fixing 6 above, I noticed that a number of other items were being
135        incorrectly rejected as "not fixed length". This arose partly because newer
136        opcodes had not been added to the fixed-length checking code. I have (a)
137        corrected the bug and added tests for these items, and (b) arranged for an
138        error to occur if an unknown opcode is encountered while checking for fixed
139        length instead of just assuming "not fixed length". The items that were
140        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
141        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
142        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
143    
144    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
145        being incorrectly compiled and would have given unpredicatble results.
146    
147    9.  A possessively repeated subpattern with minimum repeat count greater than
148        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
149        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
150        the first (A) could occur when it should not.
151    
152    10. Add a cast and remove a redundant test from the code.
153    
154    11. JIT should use pcre_malloc/pcre_free for allocation.
155    
156    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
157        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
158        is anything other than /usr, -L is still shown).
159    
160    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
161    
162    14. Perl does not support \N without a following name in a [] class; PCRE now
163        also gives an error.
164    
165    15. If a forward reference was repeated with an upper limit of around 2000,
166        it caused the error "internal error: overran compiling workspace". The
167        maximum number of forward references (including repeats) was limited by the
168        internal workspace, and dependent on the LINK_SIZE. The code has been
169        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
170        the default depends on LINK_SIZE. There is a new upper limit (for safety)
171        of around 200,000 forward references. While doing this, I also speeded up
172        the filling in of repeated forward references.
173    
174    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
175        incorrectly expecting the subject to contain another "a" after the start.
176    
177    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
178        in the match, the SKIP should be ignored. This was not happening; instead
179        the SKIP was being treated as NOMATCH. For patterns such as
180        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
181        tested.
182    
183    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
184        now much more compatible with Perl, in particular in cases where the result
185        is a non-match for a non-anchored pattern. For example, if
186        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
187        "m", where previously it did not return a name. A side effect of this
188        change is that for partial matches, the last encountered mark name is
189        returned, as for non matches. A number of tests that were previously not
190        Perl-compatible have been moved into the Perl-compatible test files. The
191        refactoring has had the pleasing side effect of removing one argument from
192        the match() function, thus reducing its stack requirements.
193    
194    19. If the /S+ option was used in pcretest to study a pattern using JIT,
195        subsequent uses of /S (without +) incorrectly behaved like /S+.
196    
197    21. Retrieve executable code size support for the JIT compiler and fixing
198        some warnings.
199    
200    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
201        not work when the shorter character appeared right at the end of the
202        subject string.
203    
204    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
205        systems.
206    
207    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
208        output it when the /M option is used in pcretest.
209    
210    25. The CheckMan script was not being included in the distribution. Also, added
211        an explicit "perl" to run Perl scripts from the PrepareRelease script
212        because this is reportedly needed in Windows.
213    
214    26. If study data was being save in a file and studying had not found a set of
215        "starts with" bytes for the pattern, the data written to the file (though
216        never used) was taken from uninitialized memory and so caused valgrind to
217        complain.
218    
219    27. Updated RunTest.bat as provided by Sheri Pierce.
220    
221    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
222    
223    29. Computation of memory usage for the table of capturing group names was
224        giving an unnecessarily large value.
225    
226    
227    Version 8.20 21-Oct-2011
228    ------------------------
229    
230    1.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had
231        a POSIX class. After further experiments with Perl, which convinced me that
232        Perl has bugs and confusions, a closing square bracket is no longer allowed
233        in a POSIX name. This bug also affected patterns with classes that started
234        with full stops.
235    
236    2.  If a pattern such as /(a)b|ac/ is matched against "ac", there is no
237        captured substring, but while checking the failing first alternative,
238        substring 1 is temporarily captured. If the output vector supplied to
239        pcre_exec() was not big enough for this capture, the yield of the function
240        was still zero ("insufficient space for captured substrings"). This cannot
241        be totally fixed without adding another stack variable, which seems a lot
242        of expense for a edge case. However, I have improved the situation in cases
243        such as /(a)(b)x|abc/ matched against "abc", where the return code
244        indicates that fewer than the maximum number of slots in the ovector have
245        been set.
246    
247    3.  Related to (2) above: when there are more back references in a pattern than
248        slots in the output vector, pcre_exec() uses temporary memory during
249        matching, and copies in the captures as far as possible afterwards. It was
250        using the entire output vector, but this conflicts with the specification
251        that only 2/3 is used for passing back captured substrings. Now it uses
252        only the first 2/3, for compatibility. This is, of course, another edge
253        case.
254    
255    4.  Zoltan Herczeg's just-in-time compiler support has been integrated into the
256        main code base, and can be used by building with --enable-jit. When this is
257        done, pcregrep automatically uses it unless --disable-pcregrep-jit or the
258        runtime --no-jit option is given.
259    
260    5.  When the number of matches in a pcre_dfa_exec() run exactly filled the
261        ovector, the return from the function was zero, implying that there were
262        other matches that did not fit. The correct "exactly full" value is now
263        returned.
264    
265    6.  If a subpattern that was called recursively or as a subroutine contained
266        (*PRUNE) or any other control that caused it to give a non-standard return,
267        invalid errors such as "Error -26 (nested recursion at the same subject
268        position)" or even infinite loops could occur.
269    
270    7.  If a pattern such as /a(*SKIP)c|b(*ACCEPT)|/ was studied, it stopped
271        computing the minimum length on reaching *ACCEPT, and so ended up with the
272        wrong value of 1 rather than 0. Further investigation indicates that
273        computing a minimum subject length in the presence of *ACCEPT is difficult
274        (think back references, subroutine calls), and so I have changed the code
275        so that no minimum is registered for a pattern that contains *ACCEPT.
276    
277    8.  If (*THEN) was present in the first (true) branch of a conditional group,
278        it was not handled as intended. [But see 16 below.]
279    
280    9.  Replaced RunTest.bat and CMakeLists.txt with improved versions provided by
281        Sheri Pierce.
282    
283    10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that
284        the first byte in a match must be "a".
285    
286    11. Change 17 for 8.13 increased the recursion depth for patterns like
287        /a(?:.)*?a/ drastically. I've improved things by remembering whether a
288        pattern contains any instances of (*THEN). If it does not, the old
289        optimizations are restored. It would be nice to do this on a per-group
290        basis, but at the moment that is not feasible.
291    
292    12. In some environments, the output of pcretest -C is CRLF terminated. This
293        broke RunTest's code that checks for the link size. A single white space
294        character after the value is now allowed for.
295    
296    13. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".
297        For "fr", it uses the Windows-specific input and output files.
298    
299    14. If (*THEN) appeared in a group that was called recursively or as a
300        subroutine, it did not work as intended. [But see next item.]
301    
302    15. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex
303        pattern fragments (but not containing any | characters). If A and B are
304        matched, but there is a failure in C so that it backtracks to (*THEN), PCRE
305        was behaving differently to Perl. PCRE backtracked into A, but Perl goes to
306        D. In other words, Perl considers parentheses that do not contain any |
307        characters to be part of a surrounding alternative, whereas PCRE was
308        treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles
309        differently. PCRE now behaves in the same way as Perl, except in the case
310        of subroutine/recursion calls such as (?1) which have in any case always
311        been different (but PCRE had them first :-).
312    
313    16. Related to 15 above: Perl does not treat the | in a conditional group as
314        creating alternatives. Such a group is treated in the same way as an
315        ordinary group without any | characters when processing (*THEN). PCRE has
316        been changed to match Perl's behaviour.
317    
318    17. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the
319        RunGrepTest script failed.
320    
321    18. Change 22 for version 13 caused atomic groups to use more stack. This is
322        inevitable for groups that contain captures, but it can lead to a lot of
323        stack use in large patterns. The old behaviour has been restored for atomic
324        groups that do not contain any capturing parentheses.
325    
326    19. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not
327        suppress the check for a minimum subject length at run time. (If it was
328        given to pcre_exec() or pcre_dfa_exec() it did work.)
329    
330    20. Fixed an ASCII-dependent infelicity in pcretest that would have made it
331        fail to work when decoding hex characters in data strings in EBCDIC
332        environments.
333    
334    21. It appears that in at least one Mac OS environment, the isxdigit() function
335        is implemented as a macro that evaluates to its argument more than once,
336        contravening the C 90 Standard (I haven't checked a later standard). There
337        was an instance in pcretest which caused it to go wrong when processing
338        \x{...} escapes in subject strings. The has been rewritten to avoid using
339        things like p++ in the argument of isxdigit().
340    
341    
342    Version 8.13 16-Aug-2011
343  ------------------------  ------------------------
344    
345  1.  The Unicode data tables have been updated to Unicode 6.0.0.  1.  The Unicode data tables have been updated to Unicode 6.0.0.
# Line 20  Version 8.13 30-Apr-2011 Line 358  Version 8.13 30-Apr-2011
358      code. (b) A reference to 2 copies of a 3-byte code would not match 2 of a      code. (b) A reference to 2 copies of a 3-byte code would not match 2 of a
359      2-byte code at the end of the subject (it thought there wasn't enough data      2-byte code at the end of the subject (it thought there wasn't enough data
360      left).      left).
361    
362  5.  Comprehensive information about what went wrong is now returned by  5.  Comprehensive information about what went wrong is now returned by
363      pcre_exec() and pcre_dfa_exec() when the UTF-8 string check fails, as long      pcre_exec() and pcre_dfa_exec() when the UTF-8 string check fails, as long
364      as the output vector has at least 2 elements. The offset of the start of      as the output vector has at least 2 elements. The offset of the start of
365      the failing character and a reason code are placed in the vector.      the failing character and a reason code are placed in the vector.
366    
367  6.  When the UTF-8 string check fails for pcre_compile(), the offset that is  6.  When the UTF-8 string check fails for pcre_compile(), the offset that is
368      now returned is for the first byte of the failing character, instead of the      now returned is for the first byte of the failing character, instead of the
369      last byte inspected. This is an incompatible change, but I hope it is small      last byte inspected. This is an incompatible change, but I hope it is small
370      enough not to be a problem. It makes the returned offset consistent with      enough not to be a problem. It makes the returned offset consistent with
371      pcre_exec() and pcre_dfa_exec().      pcre_exec() and pcre_dfa_exec().
372    
373  7.  pcretest now gives a text phrase as well as the error number when  7.  pcretest now gives a text phrase as well as the error number when
374      pcre_exec() or pcre_dfa_exec() fails; if the error is a UTF-8 check      pcre_exec() or pcre_dfa_exec() fails; if the error is a UTF-8 check
375      failure, the offset and reason code are output.      failure, the offset and reason code are output.
376    
377  8.  When \R was used with a maximizing quantifier it failed to skip backwards  8.  When \R was used with a maximizing quantifier it failed to skip backwards
378      over a \r\n pair if the subsequent match failed. Instead, it just skipped      over a \r\n pair if the subsequent match failed. Instead, it just skipped
379      back over a single character (\n). This seems wrong (because it treated the      back over a single character (\n). This seems wrong (because it treated the
380      two characters as a single entity when going forwards), conflicts with the      two characters as a single entity when going forwards), conflicts with the
381      documentation that \R is equivalent to (?>\r\n|\n|...etc), and makes the      documentation that \R is equivalent to (?>\r\n|\n|...etc), and makes the
382      behaviour of \R* different to (\R)*, which also seems wrong. The behaviour      behaviour of \R* different to (\R)*, which also seems wrong. The behaviour
383      has been changed.      has been changed.
384    
385  9.  Some internal refactoring has changed the processing so that the handling  9.  Some internal refactoring has changed the processing so that the handling
386      of the PCRE_CASELESS and PCRE_MULTILINE options is done entirely at compile      of the PCRE_CASELESS and PCRE_MULTILINE options is done entirely at compile
387      time (the PCRE_DOTALL option was changed this way some time ago: version      time (the PCRE_DOTALL option was changed this way some time ago: version
388      7.7 change 16). This has made it possible to abolish the OP_OPT op code,      7.7 change 16). This has made it possible to abolish the OP_OPT op code,
389      which was always a bit of a fudge. It also means that there is one less      which was always a bit of a fudge. It also means that there is one less
390      argument for the match() function, which reduces its stack requirements      argument for the match() function, which reduces its stack requirements
391      slightly. This change also fixes an incompatibility with Perl: the pattern      slightly. This change also fixes an incompatibility with Perl: the pattern
392      (?i:([^b]))(?1) should not match "ab", but previously PCRE gave a match.      (?i:([^b]))(?1) should not match "ab", but previously PCRE gave a match.
393    
394  10. More internal refactoring has drastically reduced the number of recursive  10. More internal refactoring has drastically reduced the number of recursive
395      calls to match() for possessively repeated groups such as (abc)++ when      calls to match() for possessively repeated groups such as (abc)++ when
396      using pcre_exec().      using pcre_exec().
397    
398  11. While implementing 10, a number of bugs in the handling of groups were  11. While implementing 10, a number of bugs in the handling of groups were
399      discovered and fixed:      discovered and fixed:
400    
401      (?<=(a)+) was not diagnosed as invalid (non-fixed-length lookbehind).      (?<=(a)+) was not diagnosed as invalid (non-fixed-length lookbehind).
402      (a|)*(?1) gave a compile-time internal error.      (a|)*(?1) gave a compile-time internal error.
403      ((a|)+)+  did not notice that the outer group could match an empty string.      ((a|)+)+  did not notice that the outer group could match an empty string.
404      (^a|^)+   was not marked as anchored.      (^a|^)+   was not marked as anchored.
405      (.*a|.*)+ was not marked as matching at start or after a newline.      (.*a|.*)+ was not marked as matching at start or after a newline.
406    
407  12. Yet more internal refactoring has removed another argument from the match()  12. Yet more internal refactoring has removed another argument from the match()
408      function. Special calls to this function are now indicated by setting a      function. Special calls to this function are now indicated by setting a
409      value in a variable in the "match data" data block.      value in a variable in the "match data" data block.
410    
411  13. Be more explicit in pcre_study() instead of relying on "default" for  13. Be more explicit in pcre_study() instead of relying on "default" for
412      opcodes that mean there is no starting character; this means that when new      opcodes that mean there is no starting character; this means that when new
413      ones are added and accidentally left out of pcre_study(), testing should      ones are added and accidentally left out of pcre_study(), testing should
414      pick them up.      pick them up.
415    
416  14. The -s option of pcretest has been documented for ages as being an old  14. The -s option of pcretest has been documented for ages as being an old
417      synonym of -m (show memory usage). I have changed it to mean "force study      synonym of -m (show memory usage). I have changed it to mean "force study
418      for every regex", that is, assume /S for every regex. This is similar to -i      for every regex", that is, assume /S for every regex. This is similar to -i
419      and -d etc. It's slightly incompatible, but I'm hoping nobody is still      and -d etc. It's slightly incompatible, but I'm hoping nobody is still
420      using it. It makes it easier to run collections of tests with and without      using it. It makes it easier to run collections of tests with and without
421      study enabled, and thereby test pcre_study() more easily. All the standard      study enabled, and thereby test pcre_study() more easily. All the standard
422      tests are now run with and without -s (but some patterns can be marked as      tests are now run with and without -s (but some patterns can be marked as
423      "never study" - see 20 below).      "never study" - see 20 below).
424    
425  15. When (*ACCEPT) was used in a subpattern that was called recursively, the  15. When (*ACCEPT) was used in a subpattern that was called recursively, the
426      restoration of the capturing data to the outer values was not happening      restoration of the capturing data to the outer values was not happening
427      correctly.      correctly.
428    
429  16. If a recursively called subpattern ended with (*ACCEPT) and matched an  16. If a recursively called subpattern ended with (*ACCEPT) and matched an
430      empty string, and PCRE_NOTEMPTY was set, pcre_exec() thought the whole      empty string, and PCRE_NOTEMPTY was set, pcre_exec() thought the whole
431      pattern had matched an empty string, and so incorrectly returned a no      pattern had matched an empty string, and so incorrectly returned a no
432      match.      match.
433    
434  17. There was optimizing code for the last branch of non-capturing parentheses,  17. There was optimizing code for the last branch of non-capturing parentheses,
435      and also for the obeyed branch of a conditional subexpression, which used      and also for the obeyed branch of a conditional subexpression, which used
436      tail recursion to cut down on stack usage. Unfortunately, not that there is      tail recursion to cut down on stack usage. Unfortunately, now that there is
437      the possibility of (*THEN) occurring in these branches, tail recursion is      the possibility of (*THEN) occurring in these branches, tail recursion is
438      no longer possible because the return has to be checked for (*THEN). These      no longer possible because the return has to be checked for (*THEN). These
439      two optimizations have therefore been removed.      two optimizations have therefore been removed. [But see 8.20/11 above.]
440    
441  18. If a pattern containing \R was studied, it was assumed that \R always  18. If a pattern containing \R was studied, it was assumed that \R always
442      matched two bytes, thus causing the minimum subject length to be      matched two bytes, thus causing the minimum subject length to be
443      incorrectly computed because \R can also match just one byte.      incorrectly computed because \R can also match just one byte.
444    
445  19. If a pattern containing (*ACCEPT) was studied, the minimum subject length  19. If a pattern containing (*ACCEPT) was studied, the minimum subject length
446      was incorrectly computed.      was incorrectly computed.
447    
448  20. If /S is present twice on a test pattern in pcretest input, it *disables*  20. If /S is present twice on a test pattern in pcretest input, it now
449      studying, thereby overriding the use of -s on the command line. This is      *disables* studying, thereby overriding the use of -s on the command line
450      necessary for one or two tests to keep the output identical in both cases.      (see 14 above). This is necessary for one or two tests to keep the output
451        identical in both cases.
452    
453  21. When (*ACCEPT) was used in an assertion that matched an empty string and  21. When (*ACCEPT) was used in an assertion that matched an empty string and
454      PCRE_NOTEMPTY was set, PCRE applied the non-empty test to the assertion.      PCRE_NOTEMPTY was set, PCRE applied the non-empty test to the assertion.
455    
456  22. When an atomic group that contained a capturing parenthesis was  22. When an atomic group that contained a capturing parenthesis was
457      successfully matched, but the branch in which it appeared failed, the      successfully matched, but the branch in which it appeared failed, the
458      capturing was not being forgotten if a higher numbered group was later      capturing was not being forgotten if a higher numbered group was later
459      captured. For example, /(?>(a))b|(a)c/ when matching "ac" set capturing      captured. For example, /(?>(a))b|(a)c/ when matching "ac" set capturing
460      group 1 to "a", when in fact it should be unset. This applied to multi-      group 1 to "a", when in fact it should be unset. This applied to multi-
461      branched capturing and non-capturing groups, repeated or not, and also to      branched capturing and non-capturing groups, repeated or not, and also to
462      positive assertions (capturing in negative assertions is not well defined      positive assertions (capturing in negative assertions does not happen
463      in PCRE) and also to nested atomic groups.      in PCRE) and also to nested atomic groups.
464    
465  23. Add the ++ qualifier feature to pcretest, to show the remainder of the  23. Add the ++ qualifier feature to pcretest, to show the remainder of the
466      subject after a captured substring (to make it easier to tell which of a      subject after a captured substring, to make it easier to tell which of a
467      number of identical substrings has been captured).      number of identical substrings has been captured.
468    
469  24. The way atomic groups are processed by pcre_exec() has been changed so that  24. The way atomic groups are processed by pcre_exec() has been changed so that
470      if they are repeated, backtracking one repetition now resets captured      if they are repeated, backtracking one repetition now resets captured
471      values correctly. For example, if ((?>(a+)b)+aabab) is matched against      values correctly. For example, if ((?>(a+)b)+aabab) is matched against
472      "aaaabaaabaabab" the value of captured group 2 is now correctly recorded as      "aaaabaaabaabab" the value of captured group 2 is now correctly recorded as
473      "aaa". Previously, it would have been "a". As part of this code      "aaa". Previously, it would have been "a". As part of this code
474      refactoring, the way recursive calls are handled has also been changed.      refactoring, the way recursive calls are handled has also been changed.
475    
476  24. If an assertion condition captured any substrings, they were not passed  25. If an assertion condition captured any substrings, they were not passed
477      back unless some other capturing happened later. For example, if      back unless some other capturing happened later. For example, if
478      (?(?=(a))a) was matched against "a", no capturing was returned.      (?(?=(a))a) was matched against "a", no capturing was returned.
479    
480  25. When studying a pattern that contained subroutine calls or assertions,  26. When studying a pattern that contained subroutine calls or assertions,
481      the code for finding the minimum length of a possible match was handling      the code for finding the minimum length of a possible match was handling
482      direct recursions such as (xxx(?1)|yyy) but not mutual recursions (where      direct recursions such as (xxx(?1)|yyy) but not mutual recursions (where
483      group 1 called group 2 while simultaneously a separate group 2 called group      group 1 called group 2 while simultaneously a separate group 2 called group
484      1). A stack overflow occurred in this case. I have fixed this by limiting      1). A stack overflow occurred in this case. I have fixed this by limiting
485      the recursion depth to 10.      the recursion depth to 10.
486    
487  26. Updated RunTest.bat in the distribution to the version supplied by Tom  27. Updated RunTest.bat in the distribution to the version supplied by Tom
488      Fortmann. This supports explicit test numbers on the command line, and has      Fortmann. This supports explicit test numbers on the command line, and has
489      argument validation and error reporting.      argument validation and error reporting.
490    
491    28. An instance of \X with an unlimited repeat could fail if at any point the
492        first character it looked at was a mark character.
493    
494    29. Some minor code refactoring concerning Unicode properties and scripts
495        should reduce the stack requirement of match() slightly.
496    
497    30. Added the '=' option to pcretest to check the setting of unused capturing
498        slots at the end of the pattern, which are documented as being -1, but are
499        not included in the return count.
500    
501    31. If \k was not followed by a braced, angle-bracketed, or quoted name, PCRE
502        compiled something random. Now it gives a compile-time error (as does
503        Perl).
504    
505    32. A *MARK encountered during the processing of a positive assertion is now
506        recorded and passed back (compatible with Perl).
507    
508    33. If --only-matching or --colour was set on a pcregrep call whose pattern
509        had alternative anchored branches, the search for a second match in a line
510        was done as if at the line start. Thus, for example, /^01|^02/ incorrectly
511        matched the line "0102" twice. The same bug affected patterns that started
512        with a backwards assertion. For example /\b01|\b02/ also matched "0102"
513        twice.
514    
515    34. Previously, PCRE did not allow quantification of assertions. However, Perl
516        does, and because of capturing effects, quantifying parenthesized
517        assertions may at times be useful. Quantifiers are now allowed for
518        parenthesized assertions.
519    
520    35. A minor code tidy in pcre_compile() when checking options for \R usage.
521    
522    36. \g was being checked for fancy things in a character class, when it should
523        just be a literal "g".
524    
525    37. PCRE was rejecting [:a[:digit:]] whereas Perl was not. It seems that the
526        appearance of a nested POSIX class supersedes an apparent external class.
527        For example, [:a[:digit:]b:] matches "a", "b", ":", or a digit. Also,
528        unescaped square brackets may also appear as part of class names. For
529        example, [:a[:abc]b:] gives unknown class "[:abc]b:]". PCRE now behaves
530        more like Perl. (But see 8.20/1 above.)
531    
532    38. PCRE was giving an error for \N with a braced quantifier such as {1,} (this
533        was because it thought it was \N{name}, which is not supported).
534    
535    39. Add minix to OS list not supporting the -S option in pcretest.
536    
537    40. PCRE tries to detect cases of infinite recursion at compile time, but it
538        cannot analyze patterns in sufficient detail to catch mutual recursions
539        such as ((?1))((?2)). There is now a runtime test that gives an error if a
540        subgroup is called recursively as a subpattern for a second time at the
541        same position in the subject string. In previous releases this might have
542        been caught by the recursion limit, or it might have run out of stack.
543    
544    41. A pattern such as /(?(R)a+|(?R)b)/ is quite safe, as the recursion can
545        happen only once. PCRE was, however incorrectly giving a compile time error
546        "recursive call could loop indefinitely" because it cannot analyze the
547        pattern in sufficient detail. The compile time test no longer happens when
548        PCRE is compiling a conditional subpattern, but actual runaway loops are
549        now caught at runtime (see 40 above).
550    
551    42. It seems that Perl allows any characters other than a closing parenthesis
552        to be part of the NAME in (*MARK:NAME) and other backtracking verbs. PCRE
553        has been changed to be the same.
554    
555    43. Updated configure.ac to put in more quoting round AC_LANG_PROGRAM etc. so
556        as not to get warnings when autogen.sh is called. Also changed
557        AC_PROG_LIBTOOL (deprecated) to LT_INIT (the current macro).
558    
559    44. To help people who use pcregrep to scan files containing exceedingly long
560        lines, the following changes have been made:
561    
562        (a) The default value of the buffer size parameter has been increased from
563            8K to 20K. (The actual buffer used is three times this size.)
564    
565        (b) The default can be changed by ./configure --with-pcregrep-bufsize when
566            PCRE is built.
567    
568        (c) A --buffer-size=n option has been added to pcregrep, to allow the size
569            to be set at run time.
570    
571        (d) Numerical values in pcregrep options can be followed by K or M, for
572            example --buffer-size=50K.
573    
574        (e) If a line being scanned overflows pcregrep's buffer, an error is now
575            given and the return code is set to 2.
576    
577    45. Add a pointer to the latest mark to the callout data block.
578    
579    46. The pattern /.(*F)/, when applied to "abc" with PCRE_PARTIAL_HARD, gave a
580        partial match of an empty string instead of no match. This was specific to
581        the use of ".".
582    
583    47. The pattern /f.*/8s, when applied to "for" with PCRE_PARTIAL_HARD, gave a
584        complete match instead of a partial match. This bug was dependent on both
585        the PCRE_UTF8 and PCRE_DOTALL options being set.
586    
587    48. For a pattern such as /\babc|\bdef/ pcre_study() was failing to set up the
588        starting byte set, because \b was not being ignored.
589    
590    
591  Version 8.12 15-Jan-2011  Version 8.12 15-Jan-2011

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