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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.13 30-Apr-2011  Version 8.30
5    ------------
6    
7    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
8        name is defined in ctype.h.
9    
10    2.  Fixed a bug in the code for calculating the fixed length of lookbehind
11        assertions.
12    
13    3.  Removed the function pcre_info(), which has been obsolete and deprecated
14        since it was replaced by pcre_fullinfo() in February 2000.
15    
16    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
17        match a (*MARK), and the match failed at the start of the subject, a
18        reference to memory before the start of the subject could occur. This bug
19        was introduced by fix 17 of release 8.21.
20    
21    5.  A reference to an unset group with zero minimum repetition was giving
22        totally wrong answers (in non-JavaScript-compatibility mode). For example,
23        /(another)?(\1?)test/ matched against "hello world test". This bug was
24        introduced in release 8.13.
25    
26    6.  Add support for 16-bit character strings (a large amount of work involving
27        many changes and refactorings).
28    
29    
30    Version 8.21 12-Dec-2011
31    ------------------------
32    
33    1.  Updating the JIT compiler.
34    
35    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
36        are added as well.
37    
38    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
39        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
40        calling _pcre_jit_exec. Some extra comments are added.
41    
42    4.  (*MARK) settings inside atomic groups that do not contain any capturing
43        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
44        was introduced by change 18 for 8.20.
45    
46    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
47        ECMA-262 standard.
48    
49    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
50        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
51        This bug was probably introduced by change 9 of 8.13.
52    
53    7.  While fixing 6 above, I noticed that a number of other items were being
54        incorrectly rejected as "not fixed length". This arose partly because newer
55        opcodes had not been added to the fixed-length checking code. I have (a)
56        corrected the bug and added tests for these items, and (b) arranged for an
57        error to occur if an unknown opcode is encountered while checking for fixed
58        length instead of just assuming "not fixed length". The items that were
59        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
60        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
61        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
62    
63    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
64        being incorrectly compiled and would have given unpredicatble results.
65    
66    9.  A possessively repeated subpattern with minimum repeat count greater than
67        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
68        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
69        the first (A) could occur when it should not.
70    
71    10. Add a cast and remove a redundant test from the code.
72    
73    11. JIT should use pcre_malloc/pcre_free for allocation.
74    
75    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
76        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
77        is anything other than /usr, -L is still shown).
78    
79    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
80    
81    14. Perl does not support \N without a following name in a [] class; PCRE now
82        also gives an error.
83    
84    15. If a forward reference was repeated with an upper limit of around 2000,
85        it caused the error "internal error: overran compiling workspace". The
86        maximum number of forward references (including repeats) was limited by the
87        internal workspace, and dependent on the LINK_SIZE. The code has been
88        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
89        the default depends on LINK_SIZE. There is a new upper limit (for safety)
90        of around 200,000 forward references. While doing this, I also speeded up
91        the filling in of repeated forward references.
92    
93    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
94        incorrectly expecting the subject to contain another "a" after the start.
95    
96    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
97        in the match, the SKIP should be ignored. This was not happening; instead
98        the SKIP was being treated as NOMATCH. For patterns such as
99        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
100        tested.
101    
102    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
103        now much more compatible with Perl, in particular in cases where the result
104        is a non-match for a non-anchored pattern. For example, if
105        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
106        "m", where previously it did not return a name. A side effect of this
107        change is that for partial matches, the last encountered mark name is
108        returned, as for non matches. A number of tests that were previously not
109        Perl-compatible have been moved into the Perl-compatible test files. The
110        refactoring has had the pleasing side effect of removing one argument from
111        the match() function, thus reducing its stack requirements.
112    
113    19. If the /S+ option was used in pcretest to study a pattern using JIT,
114        subsequent uses of /S (without +) incorrectly behaved like /S+.
115    
116    21. Retrieve executable code size support for the JIT compiler and fixing
117        some warnings.
118    
119    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
120        not work when the shorter character appeared right at the end of the
121        subject string.
122    
123    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
124        systems.
125    
126    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
127        output it when the /M option is used in pcretest.
128    
129    25. The CheckMan script was not being included in the distribution. Also, added
130        an explicit "perl" to run Perl scripts from the PrepareRelease script
131        because this is reportedly needed in Windows.
132    
133    26. If study data was being save in a file and studying had not found a set of
134        "starts with" bytes for the pattern, the data written to the file (though
135        never used) was taken from uninitialized memory and so caused valgrind to
136        complain.
137    
138    27. Updated RunTest.bat as provided by Sheri Pierce.
139    
140    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
141    
142    29. Computation of memory usage for the table of capturing group names was
143        giving an unnecessarily large value.
144    
145    
146    Version 8.20 21-Oct-2011
147    ------------------------
148    
149    1.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had
150        a POSIX class. After further experiments with Perl, which convinced me that
151        Perl has bugs and confusions, a closing square bracket is no longer allowed
152        in a POSIX name. This bug also affected patterns with classes that started
153        with full stops.
154    
155    2.  If a pattern such as /(a)b|ac/ is matched against "ac", there is no
156        captured substring, but while checking the failing first alternative,
157        substring 1 is temporarily captured. If the output vector supplied to
158        pcre_exec() was not big enough for this capture, the yield of the function
159        was still zero ("insufficient space for captured substrings"). This cannot
160        be totally fixed without adding another stack variable, which seems a lot
161        of expense for a edge case. However, I have improved the situation in cases
162        such as /(a)(b)x|abc/ matched against "abc", where the return code
163        indicates that fewer than the maximum number of slots in the ovector have
164        been set.
165    
166    3.  Related to (2) above: when there are more back references in a pattern than
167        slots in the output vector, pcre_exec() uses temporary memory during
168        matching, and copies in the captures as far as possible afterwards. It was
169        using the entire output vector, but this conflicts with the specification
170        that only 2/3 is used for passing back captured substrings. Now it uses
171        only the first 2/3, for compatibility. This is, of course, another edge
172        case.
173    
174    4.  Zoltan Herczeg's just-in-time compiler support has been integrated into the
175        main code base, and can be used by building with --enable-jit. When this is
176        done, pcregrep automatically uses it unless --disable-pcregrep-jit or the
177        runtime --no-jit option is given.
178    
179    5.  When the number of matches in a pcre_dfa_exec() run exactly filled the
180        ovector, the return from the function was zero, implying that there were
181        other matches that did not fit. The correct "exactly full" value is now
182        returned.
183    
184    6.  If a subpattern that was called recursively or as a subroutine contained
185        (*PRUNE) or any other control that caused it to give a non-standard return,
186        invalid errors such as "Error -26 (nested recursion at the same subject
187        position)" or even infinite loops could occur.
188    
189    7.  If a pattern such as /a(*SKIP)c|b(*ACCEPT)|/ was studied, it stopped
190        computing the minimum length on reaching *ACCEPT, and so ended up with the
191        wrong value of 1 rather than 0. Further investigation indicates that
192        computing a minimum subject length in the presence of *ACCEPT is difficult
193        (think back references, subroutine calls), and so I have changed the code
194        so that no minimum is registered for a pattern that contains *ACCEPT.
195    
196    8.  If (*THEN) was present in the first (true) branch of a conditional group,
197        it was not handled as intended. [But see 16 below.]
198    
199    9.  Replaced RunTest.bat and CMakeLists.txt with improved versions provided by
200        Sheri Pierce.
201    
202    10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that
203        the first byte in a match must be "a".
204    
205    11. Change 17 for 8.13 increased the recursion depth for patterns like
206        /a(?:.)*?a/ drastically. I've improved things by remembering whether a
207        pattern contains any instances of (*THEN). If it does not, the old
208        optimizations are restored. It would be nice to do this on a per-group
209        basis, but at the moment that is not feasible.
210    
211    12. In some environments, the output of pcretest -C is CRLF terminated. This
212        broke RunTest's code that checks for the link size. A single white space
213        character after the value is now allowed for.
214    
215    13. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".
216        For "fr", it uses the Windows-specific input and output files.
217    
218    14. If (*THEN) appeared in a group that was called recursively or as a
219        subroutine, it did not work as intended. [But see next item.]
220    
221    15. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex
222        pattern fragments (but not containing any | characters). If A and B are
223        matched, but there is a failure in C so that it backtracks to (*THEN), PCRE
224        was behaving differently to Perl. PCRE backtracked into A, but Perl goes to
225        D. In other words, Perl considers parentheses that do not contain any |
226        characters to be part of a surrounding alternative, whereas PCRE was
227        treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles
228        differently. PCRE now behaves in the same way as Perl, except in the case
229        of subroutine/recursion calls such as (?1) which have in any case always
230        been different (but PCRE had them first :-).
231    
232    16. Related to 15 above: Perl does not treat the | in a conditional group as
233        creating alternatives. Such a group is treated in the same way as an
234        ordinary group without any | characters when processing (*THEN). PCRE has
235        been changed to match Perl's behaviour.
236    
237    17. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the
238        RunGrepTest script failed.
239    
240    18. Change 22 for version 13 caused atomic groups to use more stack. This is
241        inevitable for groups that contain captures, but it can lead to a lot of
242        stack use in large patterns. The old behaviour has been restored for atomic
243        groups that do not contain any capturing parentheses.
244    
245    19. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not
246        suppress the check for a minimum subject length at run time. (If it was
247        given to pcre_exec() or pcre_dfa_exec() it did work.)
248    
249    20. Fixed an ASCII-dependent infelicity in pcretest that would have made it
250        fail to work when decoding hex characters in data strings in EBCDIC
251        environments.
252    
253    21. It appears that in at least one Mac OS environment, the isxdigit() function
254        is implemented as a macro that evaluates to its argument more than once,
255        contravening the C 90 Standard (I haven't checked a later standard). There
256        was an instance in pcretest which caused it to go wrong when processing
257        \x{...} escapes in subject strings. The has been rewritten to avoid using
258        things like p++ in the argument of isxdigit().
259    
260    
261    Version 8.13 16-Aug-2011
262  ------------------------  ------------------------
263    
264  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 277  Version 8.13 30-Apr-2011
277      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
278      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
279      left).      left).
280    
281  5.  Comprehensive information about what went wrong is now returned by  5.  Comprehensive information about what went wrong is now returned by
282      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
283      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
284      the failing character and a reason code are placed in the vector.      the failing character and a reason code are placed in the vector.
285    
286  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
287      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
288      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
289      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
290      pcre_exec() and pcre_dfa_exec().      pcre_exec() and pcre_dfa_exec().
291    
292  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
293      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
294      failure, the offset and reason code are output.      failure, the offset and reason code are output.
295    
296  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
297      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
298      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
299      two characters as a single entity when going forwards), conflicts with the      two characters as a single entity when going forwards), conflicts with the
300      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
301      behaviour of \R* different to (\R)*, which also seems wrong. The behaviour      behaviour of \R* different to (\R)*, which also seems wrong. The behaviour
302      has been changed.      has been changed.
303    
304  9.  Some internal refactoring has changed the processing so that the handling  9.  Some internal refactoring has changed the processing so that the handling
305      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
306      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
307      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,
308      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
309      argument for the match() function, which reduces its stack requirements      argument for the match() function, which reduces its stack requirements
310      slightly. This change also fixes an incompatibility with Perl: the pattern      slightly. This change also fixes an incompatibility with Perl: the pattern
311      (?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.
312    
313  10. More internal refactoring has drastically reduced the number of recursive  10. More internal refactoring has drastically reduced the number of recursive
314      calls to match() for possessively repeated groups such as (abc)++ when      calls to match() for possessively repeated groups such as (abc)++ when
315      using pcre_exec().      using pcre_exec().
316    
317  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
318      discovered and fixed:      discovered and fixed:
319    
320      (?<=(a)+) was not diagnosed as invalid (non-fixed-length lookbehind).      (?<=(a)+) was not diagnosed as invalid (non-fixed-length lookbehind).
321      (a|)*(?1) gave a compile-time internal error.      (a|)*(?1) gave a compile-time internal error.
322      ((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.
323      (^a|^)+   was not marked as anchored.      (^a|^)+   was not marked as anchored.
324      (.*a|.*)+ was not marked as matching at start or after a newline.      (.*a|.*)+ was not marked as matching at start or after a newline.
325    
326  12. Yet more internal refactoring has removed another argument from the match()  12. Yet more internal refactoring has removed another argument from the match()
327      function. Special calls to this function are now indicated by setting a      function. Special calls to this function are now indicated by setting a
328      value in a variable in the "match data" data block.      value in a variable in the "match data" data block.
329    
330  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
331      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
332      ones are added and accidentally left out of pcre_study(), testing should      ones are added and accidentally left out of pcre_study(), testing should
333      pick them up.      pick them up.
334    
335  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
336      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
337      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
338      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
339      using it. It makes it easier to run collection of tests with study enabled,      using it. It makes it easier to run collections of tests with and without
340      and thereby test pcre_study() more easily.      study enabled, and thereby test pcre_study() more easily. All the standard
341        tests are now run with and without -s (but some patterns can be marked as
342        "never study" - see 20 below).
343    
344  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
345      restoration of the capturing data to the outer values was not happening      restoration of the capturing data to the outer values was not happening
346      correctly.      correctly.
347    
348  16. If a recursively called subpattern ended with (*ACCEPT) and matched an  16. If a recursively called subpattern ended with (*ACCEPT) and matched an
349      empty string, and PCRE_NOTEMPTY was set, pcre_exec() thought the whole      empty string, and PCRE_NOTEMPTY was set, pcre_exec() thought the whole
350      pattern had matched an empty string, and so incorrectly returned a no      pattern had matched an empty string, and so incorrectly returned a no
351      match.      match.
352    
353    17. There was optimizing code for the last branch of non-capturing parentheses,
354        and also for the obeyed branch of a conditional subexpression, which used
355        tail recursion to cut down on stack usage. Unfortunately, now that there is
356        the possibility of (*THEN) occurring in these branches, tail recursion is
357        no longer possible because the return has to be checked for (*THEN). These
358        two optimizations have therefore been removed. [But see 8.20/11 above.]
359    
360    18. If a pattern containing \R was studied, it was assumed that \R always
361        matched two bytes, thus causing the minimum subject length to be
362        incorrectly computed because \R can also match just one byte.
363    
364    19. If a pattern containing (*ACCEPT) was studied, the minimum subject length
365        was incorrectly computed.
366    
367    20. If /S is present twice on a test pattern in pcretest input, it now
368        *disables* studying, thereby overriding the use of -s on the command line
369        (see 14 above). This is necessary for one or two tests to keep the output
370        identical in both cases.
371    
372    21. When (*ACCEPT) was used in an assertion that matched an empty string and
373        PCRE_NOTEMPTY was set, PCRE applied the non-empty test to the assertion.
374    
375    22. When an atomic group that contained a capturing parenthesis was
376        successfully matched, but the branch in which it appeared failed, the
377        capturing was not being forgotten if a higher numbered group was later
378        captured. For example, /(?>(a))b|(a)c/ when matching "ac" set capturing
379        group 1 to "a", when in fact it should be unset. This applied to multi-
380        branched capturing and non-capturing groups, repeated or not, and also to
381        positive assertions (capturing in negative assertions does not happen
382        in PCRE) and also to nested atomic groups.
383    
384    23. Add the ++ qualifier feature to pcretest, to show the remainder of the
385        subject after a captured substring, to make it easier to tell which of a
386        number of identical substrings has been captured.
387    
388    24. The way atomic groups are processed by pcre_exec() has been changed so that
389        if they are repeated, backtracking one repetition now resets captured
390        values correctly. For example, if ((?>(a+)b)+aabab) is matched against
391        "aaaabaaabaabab" the value of captured group 2 is now correctly recorded as
392        "aaa". Previously, it would have been "a". As part of this code
393        refactoring, the way recursive calls are handled has also been changed.
394    
395    25. If an assertion condition captured any substrings, they were not passed
396        back unless some other capturing happened later. For example, if
397        (?(?=(a))a) was matched against "a", no capturing was returned.
398    
399    26. When studying a pattern that contained subroutine calls or assertions,
400        the code for finding the minimum length of a possible match was handling
401        direct recursions such as (xxx(?1)|yyy) but not mutual recursions (where
402        group 1 called group 2 while simultaneously a separate group 2 called group
403        1). A stack overflow occurred in this case. I have fixed this by limiting
404        the recursion depth to 10.
405    
406    27. Updated RunTest.bat in the distribution to the version supplied by Tom
407        Fortmann. This supports explicit test numbers on the command line, and has
408        argument validation and error reporting.
409    
410    28. An instance of \X with an unlimited repeat could fail if at any point the
411        first character it looked at was a mark character.
412    
413    29. Some minor code refactoring concerning Unicode properties and scripts
414        should reduce the stack requirement of match() slightly.
415    
416    30. Added the '=' option to pcretest to check the setting of unused capturing
417        slots at the end of the pattern, which are documented as being -1, but are
418        not included in the return count.
419    
420    31. If \k was not followed by a braced, angle-bracketed, or quoted name, PCRE
421        compiled something random. Now it gives a compile-time error (as does
422        Perl).
423    
424    32. A *MARK encountered during the processing of a positive assertion is now
425        recorded and passed back (compatible with Perl).
426    
427    33. If --only-matching or --colour was set on a pcregrep call whose pattern
428        had alternative anchored branches, the search for a second match in a line
429        was done as if at the line start. Thus, for example, /^01|^02/ incorrectly
430        matched the line "0102" twice. The same bug affected patterns that started
431        with a backwards assertion. For example /\b01|\b02/ also matched "0102"
432        twice.
433    
434    34. Previously, PCRE did not allow quantification of assertions. However, Perl
435        does, and because of capturing effects, quantifying parenthesized
436        assertions may at times be useful. Quantifiers are now allowed for
437        parenthesized assertions.
438    
439    35. A minor code tidy in pcre_compile() when checking options for \R usage.
440    
441    36. \g was being checked for fancy things in a character class, when it should
442        just be a literal "g".
443    
444    37. PCRE was rejecting [:a[:digit:]] whereas Perl was not. It seems that the
445        appearance of a nested POSIX class supersedes an apparent external class.
446        For example, [:a[:digit:]b:] matches "a", "b", ":", or a digit. Also,
447        unescaped square brackets may also appear as part of class names. For
448        example, [:a[:abc]b:] gives unknown class "[:abc]b:]". PCRE now behaves
449        more like Perl. (But see 8.20/1 above.)
450    
451    38. PCRE was giving an error for \N with a braced quantifier such as {1,} (this
452        was because it thought it was \N{name}, which is not supported).
453    
454    39. Add minix to OS list not supporting the -S option in pcretest.
455    
456    40. PCRE tries to detect cases of infinite recursion at compile time, but it
457        cannot analyze patterns in sufficient detail to catch mutual recursions
458        such as ((?1))((?2)). There is now a runtime test that gives an error if a
459        subgroup is called recursively as a subpattern for a second time at the
460        same position in the subject string. In previous releases this might have
461        been caught by the recursion limit, or it might have run out of stack.
462    
463    41. A pattern such as /(?(R)a+|(?R)b)/ is quite safe, as the recursion can
464        happen only once. PCRE was, however incorrectly giving a compile time error
465        "recursive call could loop indefinitely" because it cannot analyze the
466        pattern in sufficient detail. The compile time test no longer happens when
467        PCRE is compiling a conditional subpattern, but actual runaway loops are
468        now caught at runtime (see 40 above).
469    
470    42. It seems that Perl allows any characters other than a closing parenthesis
471        to be part of the NAME in (*MARK:NAME) and other backtracking verbs. PCRE
472        has been changed to be the same.
473    
474    43. Updated configure.ac to put in more quoting round AC_LANG_PROGRAM etc. so
475        as not to get warnings when autogen.sh is called. Also changed
476        AC_PROG_LIBTOOL (deprecated) to LT_INIT (the current macro).
477    
478    44. To help people who use pcregrep to scan files containing exceedingly long
479        lines, the following changes have been made:
480    
481        (a) The default value of the buffer size parameter has been increased from
482            8K to 20K. (The actual buffer used is three times this size.)
483    
484        (b) The default can be changed by ./configure --with-pcregrep-bufsize when
485            PCRE is built.
486    
487        (c) A --buffer-size=n option has been added to pcregrep, to allow the size
488            to be set at run time.
489    
490        (d) Numerical values in pcregrep options can be followed by K or M, for
491            example --buffer-size=50K.
492    
493        (e) If a line being scanned overflows pcregrep's buffer, an error is now
494            given and the return code is set to 2.
495    
496    45. Add a pointer to the latest mark to the callout data block.
497    
498    46. The pattern /.(*F)/, when applied to "abc" with PCRE_PARTIAL_HARD, gave a
499        partial match of an empty string instead of no match. This was specific to
500        the use of ".".
501    
502    47. The pattern /f.*/8s, when applied to "for" with PCRE_PARTIAL_HARD, gave a
503        complete match instead of a partial match. This bug was dependent on both
504        the PCRE_UTF8 and PCRE_DOTALL options being set.
505    
506    48. For a pattern such as /\babc|\bdef/ pcre_study() was failing to set up the
507        starting byte set, because \b was not being ignored.
508    
509    
510  Version 8.12 15-Jan-2011  Version 8.12 15-Jan-2011
511  ------------------------  ------------------------

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