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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.33 xx-xxxx-201x  Version 8.36 xx-xxx-2014
5  -------------------------  ------------------------
6    
7    1.  Got rid of some compiler warnings in the C++ modules that were shown up by
8        -Wmissing-field-initializers and -Wunused-parameter.
9    
10    2.  The tests for quantifiers being too big (greater than 65535) were being
11        applied after reading the number, and stupidly assuming that integer
12        overflow would give a negative number. The tests are now applied as the
13        numbers are read.
14    
15    3.  Tidy code in pcre_exec.c where two branches that used to be different are
16        now the same.
17    
18    4.  The JIT compiler did not generate match limit checks for certain
19        bracketed expressions with quantifiers. This may lead to exponential
20        backtracking, instead of returning with PCRE_ERROR_MATCHLIMIT. This
21        issue should be resolved now.
22    
23    5.  Fixed an issue, which occures when nested alternatives are optimized
24        with table jumps.
25    
26    6.  Inserted two casts and changed some ints to size_t in the light of some
27        reported 64-bit compiler warnings (Bugzilla 1477).
28    
29    7.  Fixed a bug concerned with zero-minimum possessive groups that could match
30        an empty string, which sometimes were behaving incorrectly in the
31        interpreter (though correctly in the JIT matcher). This pcretest input is
32        an example:
33    
34          '\A(?:[^"]++|"(?:[^"]*+|"")*+")++'
35          NON QUOTED "QUOT""ED" AFTER "NOT MATCHED
36    
37        the interpreter was reporting a match of 'NON QUOTED ' only, whereas the
38        JIT matcher and Perl both matched 'NON QUOTED "QUOT""ED" AFTER '. The test
39        for an empty string was breaking the inner loop and carrying on at a lower
40        level, when possessive repeated groups should always return to a higher
41        level as they have no backtrack points in them. The empty string test now
42        occurs at the outer level.
43    
44    8.  Fixed a bug that was incorrectly auto-possessifying \w+ in the pattern
45        ^\w+(?>\s*)(?<=\w) which caused it not to match "test test".
46    
47    9.  Give a compile-time error for \o{} (as Perl does) and for \x{} (which Perl
48        doesn't).
49    
50    10. Change 8.34/15 introduced a bug that caused the amount of memory needed
51        to hold a pattern to be incorrectly computed (too small) when there were
52        named back references to duplicated names. This could cause "internal
53        error: code overflow" or "double free or corruption" or other memory
54        handling errors.
55    
56    11. When named subpatterns had the same prefixes, back references could be
57        confused. For example, in this pattern:
58    
59          /(?P<Name>a)?(?P<Name2>b)?(?(<Name>)c|d)*l/
60    
61        the reference to 'Name' was incorrectly treated as a reference to a
62        duplicate name.
63    
64    12. A pattern such as /^s?c/mi8 where the optional character has more than
65        one "other case" was incorrectly compiled such that it would only try to
66        match starting at "c".
67    
68    13. When a pattern starting with \s was studied, VT was not included in the
69        list of possible starting characters; this should have been part of the
70        8.34/18 patch.
71    
72    14. If a character class started [\Qx]... where x is any character, the class
73        was incorrectly terminated at the ].
74    
75    15. If a pattern that started with a caseless match for a character with more
76        than one "other case" was studied, PCRE did not set up the starting code
77        unit bit map for the list of possible characters. Now it does. This is an
78        optimization improvement, not a bug fix.
79    
80    16. The Unicode data tables have been updated to Unicode 7.0.0.
81    
82    
83    Version 8.35 04-April-2014
84    --------------------------
85    
86    1.  A new flag is set, when property checks are present in an XCLASS.
87        When this flag is not set, PCRE can perform certain optimizations
88        such as studying these XCLASS-es.
89    
90    2.  The auto-possessification of character sets were improved: a normal
91        and an extended character set can be compared now. Furthermore
92        the JIT compiler optimizes more character set checks.
93    
94    3.  Got rid of some compiler warnings for potentially uninitialized variables
95        that show up only when compiled with -O2.
96    
97    4.  A pattern such as (?=ab\K) that uses \K in an assertion can set the start
98        of a match later then the end of the match. The pcretest program was not
99        handling the case sensibly - it was outputting from the start to the next
100        binary zero. It now reports this situation in a message, and outputs the
101        text from the end to the start.
102    
103    5.  Fast forward search is improved in JIT. Instead of the first three
104        characters, any three characters with fixed position can be searched.
105        Search order: first, last, middle.
106    
107    6.  Improve character range checks in JIT. Characters are read by an inprecise
108        function now, which returns with an unknown value if the character code is
109        above a certain treshold (e.g: 256). The only limitation is that the value
110        must be bigger than the treshold as well. This function is useful, when
111        the characters above the treshold are handled in the same way.
112    
113    7.  The macros whose names start with RAWUCHAR are placeholders for a future
114        mode in which only the bottom 21 bits of 32-bit data items are used. To
115        make this more memorable for those maintaining the code, the names have
116        been changed to start with UCHAR21, and an extensive comment has been added
117        to their definition.
118    
119    8.  Add missing (new) files sljitNativeTILEGX.c and sljitNativeTILEGX-encoder.c
120        to the export list in Makefile.am (they were accidentally omitted from the
121        8.34 tarball).
122    
123    9.  The informational output from pcretest used the phrase "starting byte set"
124        which is inappropriate for the 16-bit and 32-bit libraries. As the output
125        for "first char" and "need char" really means "non-UTF-char", I've changed
126        "byte" to "char", and slightly reworded the output. The documentation about
127        these values has also been (I hope) clarified.
128    
129    10. Another JIT related optimization: use table jumps for selecting the correct
130        backtracking path, when more than four alternatives are present inside a
131        bracket.
132    
133    11. Empty match is not possible, when the minimum length is greater than zero,
134        and there is no \K in the pattern. JIT should avoid empty match checks in
135        such cases.
136    
137    12. In a caseless character class with UCP support, when a character with more
138        than one alternative case was not the first character of a range, not all
139        the alternative cases were added to the class. For example, s and \x{17f}
140        are both alternative cases for S: the class [RST] was handled correctly,
141        but [R-T] was not.
142    
143    13. The configure.ac file always checked for pthread support when JIT was
144        enabled. This is not used in Windows, so I have put this test inside a
145        check for the presence of windows.h (which was already tested for).
146    
147    14. Improve pattern prefix search by a simplified Boyer-Moore algorithm in JIT.
148        The algorithm provides a way to skip certain starting offsets, and usually
149        faster than linear prefix searches.
150    
151    15. Change 13 for 8.20 updated RunTest to check for the 'fr' locale as well
152        as for 'fr_FR' and 'french'. For some reason, however, it then used the
153        Windows-specific input and output files, which have 'french' screwed in.
154        So this could never have worked. One of the problems with locales is that
155        they aren't always the same. I have now updated RunTest so that it checks
156        the output of the locale test (test 3) against three different output
157        files, and it allows the test to pass if any one of them matches. With luck
158        this should make the test pass on some versions of Solaris where it was
159        failing. Because of the uncertainty, the script did not used to stop if
160        test 3 failed; it now does. If further versions of a French locale ever
161        come to light, they can now easily be added.
162    
163    16. If --with-pcregrep-bufsize was given a non-integer value such as "50K",
164        there was a message during ./configure, but it did not stop. This now
165        provokes an error. The invalid example in README has been corrected.
166        If a value less than the minimum is given, the minimum value has always
167        been used, but now a warning is given.
168    
169    17. If --enable-bsr-anycrlf was set, the special 16/32-bit test failed. This
170        was a bug in the test system, which is now fixed. Also, the list of various
171        configurations that are tested for each release did not have one with both
172        16/32 bits and --enable-bar-anycrlf. It now does.
173    
174    18. pcretest was missing "-C bsr" for displaying the \R default setting.
175    
176    19. Little endian PowerPC systems are supported now by the JIT compiler.
177    
178    20. The fast forward newline mechanism could enter to an infinite loop on
179        certain invalid UTF-8 input. Although we don't support these cases
180        this issue can be fixed by a performance optimization.
181    
182    21. Change 33 of 8.34 is not sufficient to ensure stack safety because it does
183        not take account if existing stack usage. There is now a new global
184        variable called pcre_stack_guard that can be set to point to an external
185        function to check stack availability. It is called at the start of
186        processing every parenthesized group.
187    
188    22. A typo in the code meant that in ungreedy mode the max/min qualifier
189        behaved like a min-possessive qualifier, and, for example, /a{1,3}b/U did
190        not match "ab".
191    
192    23. When UTF was disabled, the JIT program reported some incorrect compile
193        errors. These messages are silenced now.
194    
195    24. Experimental support for ARM-64 and MIPS-64 has been added to the JIT
196        compiler.
197    
198    25. Change all the temporary files used in RunGrepTest to be different to those
199        used by RunTest so that the tests can be run simultaneously, for example by
200        "make -j check".
201    
202    
203    Version 8.34 15-December-2013
204    -----------------------------
205    
206    1.  Add pcre[16|32]_jit_free_unused_memory to forcibly free unused JIT
207        executable memory. Patch inspired by Carsten Klein.
208    
209    2.  ./configure --enable-coverage defined SUPPORT_GCOV in config.h, although
210        this macro is never tested and has no effect, because the work to support
211        coverage involves only compiling and linking options and special targets in
212        the Makefile. The comment in config.h implied that defining the macro would
213        enable coverage support, which is totally false. There was also support for
214        setting this macro in the CMake files (my fault, I just copied it from
215        configure). SUPPORT_GCOV has now been removed.
216    
217    3.  Make a small performance improvement in strlen16() and strlen32() in
218        pcretest.
219    
220    4.  Change 36 for 8.33 left some unreachable statements in pcre_exec.c,
221        detected by the Solaris compiler (gcc doesn't seem to be able to diagnose
222        these cases). There was also one in pcretest.c.
223    
224    5.  Cleaned up a "may be uninitialized" compiler warning in pcre_exec.c.
225    
226    6.  In UTF mode, the code for checking whether a group could match an empty
227        string (which is used for indefinitely repeated groups to allow for
228        breaking an infinite loop) was broken when the group contained a repeated
229        negated single-character class with a character that occupied more than one
230        data item and had a minimum repetition of zero (for example, [^\x{100}]* in
231        UTF-8 mode). The effect was undefined: the group might or might not be
232        deemed as matching an empty string, or the program might have crashed.
233    
234    7.  The code for checking whether a group could match an empty string was not
235        recognizing that \h, \H, \v, \V, and \R must match a character.
236    
237    8.  Implemented PCRE_INFO_MATCH_EMPTY, which yields 1 if the pattern can match
238        an empty string. If it can, pcretest shows this in its information output.
239    
240    9.  Fixed two related bugs that applied to Unicode extended grapheme clusters
241        that were repeated with a maximizing qualifier (e.g. \X* or \X{2,5}) when
242        matched by pcre_exec() without using JIT:
243    
244        (a) If the rest of the pattern did not match after a maximal run of
245            grapheme clusters, the code for backing up to try with fewer of them
246            did not always back up over a full grapheme when characters that do not
247            have the modifier quality were involved, e.g. Hangul syllables.
248    
249        (b) If the match point in a subject started with modifier character, and
250            there was no match, the code could incorrectly back up beyond the match
251            point, and potentially beyond the first character in the subject,
252            leading to a segfault or an incorrect match result.
253    
254    10. A conditional group with an assertion condition could lead to PCRE
255        recording an incorrect first data item for a match if no other first data
256        item was recorded. For example, the pattern (?(?=ab)ab) recorded "a" as a
257        first data item, and therefore matched "ca" after "c" instead of at the
258        start.
259    
260    11. Change 40 for 8.33 (allowing pcregrep to find empty strings) showed up a
261        bug that caused the command "echo a | ./pcregrep -M '|a'" to loop.
262    
263    12. The source of pcregrep now includes z/OS-specific code so that it can be
264        compiled for z/OS as part of the special z/OS distribution.
265    
266    13. Added the -T and -TM options to pcretest.
267    
268    14. The code in pcre_compile.c for creating the table of named capturing groups
269        has been refactored. Instead of creating the table dynamically during the
270        actual compiling pass, the information is remembered during the pre-compile
271        pass (on the stack unless there are more than 20 named groups, in which
272        case malloc() is used) and the whole table is created before the actual
273        compile happens. This has simplified the code (it is now nearly 150 lines
274        shorter) and prepared the way for better handling of references to groups
275        with duplicate names.
276    
277    15. A back reference to a named subpattern when there is more than one of the
278        same name now checks them in the order in which they appear in the pattern.
279        The first one that is set is used for the reference. Previously only the
280        first one was inspected. This change makes PCRE more compatible with Perl.
281    
282    16. Unicode character properties were updated from Unicode 6.3.0.
283    
284    17. The compile-time code for auto-possessification has been refactored, based
285        on a patch by Zoltan Herczeg. It now happens after instead of during
286        compilation. The code is cleaner, and more cases are handled. The option
287        PCRE_NO_AUTO_POSSESS is added for testing purposes, and the -O and /O
288        options in pcretest are provided to set it. It can also be set by
289        (*NO_AUTO_POSSESS) at the start of a pattern.
290    
291    18. The character VT has been added to the default ("C" locale) set of
292        characters that match \s and are generally treated as white space,
293        following this same change in Perl 5.18. There is now no difference between
294        "Perl space" and "POSIX space". Whether VT is treated as white space in
295        other locales depends on the locale.
296    
297    19. The code for checking named groups as conditions, either for being set or
298        for being recursed, has been refactored (this is related to 14 and 15
299        above). Processing unduplicated named groups should now be as fast at
300        numerical groups, and processing duplicated groups should be faster than
301        before.
302    
303    20. Two patches to the CMake build system, by Alexander Barkov:
304    
305          (1) Replace the "source" command by "." in CMakeLists.txt because
306              "source" is a bash-ism.
307    
308          (2) Add missing HAVE_STDINT_H and HAVE_INTTYPES_H to config-cmake.h.in;
309              without these the CMake build does not work on Solaris.
310    
311    21. Perl has changed its handling of \8 and \9. If there is no previously
312        encountered capturing group of those numbers, they are treated as the
313        literal characters 8 and 9 instead of a binary zero followed by the
314        literals. PCRE now does the same.
315    
316    22. Following Perl, added \o{} to specify codepoints in octal, making it
317        possible to specify values greater than 0777 and also making them
318        unambiguous.
319    
320    23. Perl now gives an error for missing closing braces after \x{... instead of
321        treating the string as literal. PCRE now does the same.
322    
323    24. RunTest used to grumble if an inappropriate test was selected explicitly,
324        but just skip it when running all tests. This make it awkward to run ranges
325        of tests when one of them was inappropriate. Now it just skips any
326        inappropriate tests, as it always did when running all tests.
327    
328    25. If PCRE_AUTO_CALLOUT and PCRE_UCP were set for a pattern that contained
329        character types such as \d or \w, too many callouts were inserted, and the
330        data that they returned was rubbish.
331    
332    26. In UCP mode, \s was not matching two of the characters that Perl matches,
333        namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they
334        were matched by \h. The code has now been refactored so that the lists of
335        the horizontal and vertical whitespace characters used for \h and \v (which
336        are defined only in one place) are now also used for \s.
337    
338    27. Add JIT support for the 64 bit TileGX architecture.
339        Patch by Jiong Wang (Tilera Corporation).
340    
341    28. Possessive quantifiers for classes (both explicit and automatically
342        generated) now use special opcodes instead of wrapping in ONCE brackets.
343    
344    29. Whereas an item such as A{4}+ ignored the possessivenes of the quantifier
345        (because it's meaningless), this was not happening when PCRE_CASELESS was
346        set. Not wrong, but inefficient.
347    
348    30. Updated perltest.pl to add /u (force Unicode mode) when /W (use Unicode
349        properties for \w, \d, etc) is present in a test regex. Otherwise if the
350        test contains no characters greater than 255, Perl doesn't realise it
351        should be using Unicode semantics.
352    
353    31. Upgraded the handling of the POSIX classes [:graph:], [:print:], and
354        [:punct:] when PCRE_UCP is set so as to include the same characters as Perl
355        does in Unicode mode.
356    
357    32. Added the "forbid" facility to pcretest so that putting tests into the
358        wrong test files can sometimes be quickly detected.
359    
360    33. There is now a limit (default 250) on the depth of nesting of parentheses.
361        This limit is imposed to control the amount of system stack used at compile
362        time. It can be changed at build time by --with-parens-nest-limit=xxx or
363        the equivalent in CMake.
364    
365    34. Character classes such as [A-\d] or [a-[:digit:]] now cause compile-time
366        errors. Perl warns for these when in warning mode, but PCRE has no facility
367        for giving warnings.
368    
369    35. Change 34 for 8.13 allowed quantifiers on assertions, because Perl does.
370        However, this was not working for (?!) because it is optimized to (*FAIL),
371        for which PCRE does not allow quantifiers. The optimization is now disabled
372        when a quantifier follows (?!). I can't see any use for this, but it makes
373        things uniform.
374    
375    36. Perl no longer allows group names to start with digits, so I have made this
376        change also in PCRE. It simplifies the code a bit.
377    
378    37. In extended mode, Perl ignores spaces before a + that indicates a
379        possessive quantifier. PCRE allowed a space before the quantifier, but not
380        before the possessive +. It now does.
381    
382    38. The use of \K (reset reported match start) within a repeated possessive
383        group such as (a\Kb)*+ was not working.
384    
385    40. Document that the same character tables must be used at compile time and
386        run time, and that the facility to pass tables to pcre_exec() and
387        pcre_dfa_exec() is for use only with saved/restored patterns.
388    
389    41. Applied Jeff Trawick's patch CMakeLists.txt, which "provides two new
390        features for Builds with MSVC:
391    
392        1. Support pcre.rc and/or pcreposix.rc (as is already done for MinGW
393           builds). The .rc files can be used to set FileDescription and many other
394           attributes.
395    
396        2. Add an option (-DINSTALL_MSVC_PDB) to enable installation of .pdb files.
397           This allows higher-level build scripts which want .pdb files to avoid
398           hard-coding the exact files needed."
399    
400    42. Added support for [[:<:]] and [[:>:]] as used in the BSD POSIX library to
401        mean "start of word" and "end of word", respectively, as a transition aid.
402    
403    43. A minimizing repeat of a class containing codepoints greater than 255 in
404        non-UTF 16-bit or 32-bit modes caused an internal error when PCRE was
405        compiled to use the heap for recursion.
406    
407    44. Got rid of some compiler warnings for unused variables when UTF but not UCP
408        is configured.
409    
410    
411    Version 8.33 28-May-2013
412    ------------------------
413    
414  1.  Added 'U' to some constants that are compared to unsigned integers, to  1.  Added 'U' to some constants that are compared to unsigned integers, to
415      avoid compiler signed/unsigned warnings. Added (int) casts to unsigned      avoid compiler signed/unsigned warnings. Added (int) casts to unsigned
# Line 14  Version 8.33 xx-xxxx-201x Line 421  Version 8.33 xx-xxxx-201x
421    
422  3.  Revise the creation of config.h.generic so that all boolean macros are  3.  Revise the creation of config.h.generic so that all boolean macros are
423      #undefined, whereas non-boolean macros are #ifndef/#endif-ed. This makes      #undefined, whereas non-boolean macros are #ifndef/#endif-ed. This makes
424      overriding via -D on the command line possible.      overriding via -D on the command line possible.
425    
426  4.  Changing the definition of the variable "op" in pcre_exec.c from pcre_uchar  4.  Changing the definition of the variable "op" in pcre_exec.c from pcre_uchar
427      to unsigned int is reported to make a quite noticeable speed difference in      to unsigned int is reported to make a quite noticeable speed difference in
428      a specific Windows environment. Testing on Linux did also appear to show      a specific Windows environment. Testing on Linux did also appear to show
429      some benefit (and it is clearly not harmful). Also fixed the definition of      some benefit (and it is clearly not harmful). Also fixed the definition of
430      Xop which should be unsigned.      Xop which should be unsigned.
431    
432  5.  Related to (4), changing the definition of the intermediate variable cc  5.  Related to (4), changing the definition of the intermediate variable cc
433      in repeated character loops from pcre_uchar to pcre_uint32 also gave speed      in repeated character loops from pcre_uchar to pcre_uint32 also gave speed
# Line 28  Version 8.33 xx-xxxx-201x Line 435  Version 8.33 xx-xxxx-201x
435    
436  6.  Fix forward search in JIT when link size is 3 or greater. Also removed some  6.  Fix forward search in JIT when link size is 3 or greater. Also removed some
437      unnecessary spaces.      unnecessary spaces.
438    
439  7.  Adjust autogen.sh and configure.ac to lose warnings given by automake 1.12  7.  Adjust autogen.sh and configure.ac to lose warnings given by automake 1.12
440      and later.      and later.
441    
442  8.  Fix two buffer over read issues in 16 and 32 bit modes. Affects JIT only.  8.  Fix two buffer over read issues in 16 and 32 bit modes. Affects JIT only.
443    
444  9.  Optimizing fast_forward_start_bits in JIT.  9.  Optimizing fast_forward_start_bits in JIT.
445    
446  10. Adding experimental support for callouts in JIT, and fixing some  10. Adding support for callouts in JIT, and fixing some issues revealed
447      issues revealed during this work. Namely:      during this work. Namely:
448    
449      (a) Unoptimized capturing brackets incorrectly reset on backtrack.      (a) Unoptimized capturing brackets incorrectly reset on backtrack.
450    
451      (b) Minimum length was not checked before the matching is started.      (b) Minimum length was not checked before the matching is started.
452    
453  11. The value of capture_last that is passed to callouts was incorrect in some  11. The value of capture_last that is passed to callouts was incorrect in some
454      cases when there was a capture on one path that was subsequently abandoned      cases when there was a capture on one path that was subsequently abandoned
455      after a backtrack. Also, the capture_last value is now reset after a      after a backtrack. Also, the capture_last value is now reset after a
456      recursion, since all captures are also reset in this case.      recursion, since all captures are also reset in this case.
457    
458  12. The interpreter no longer returns the "too many substrings" error in the  12. The interpreter no longer returns the "too many substrings" error in the
459      case when an overflowing capture is in a branch that is subsequently      case when an overflowing capture is in a branch that is subsequently
460      abandoned after a backtrack.      abandoned after a backtrack.
461    
462  13. In the pathological case when an offset vector of size 2 is used, pcretest  13. In the pathological case when an offset vector of size 2 is used, pcretest
463      now prints out the matched string after a yield of 0 or 1.      now prints out the matched string after a yield of 0 or 1.
464    
465  14. Inlining subpatterns in recursions, when certain conditions are fulfilled.  14. Inlining subpatterns in recursions, when certain conditions are fulfilled.
# Line 61  Version 8.33 xx-xxxx-201x Line 468  Version 8.33 xx-xxxx-201x
468  15. JIT compiler now supports 32 bit Macs thanks to Lawrence Velazquez.  15. JIT compiler now supports 32 bit Macs thanks to Lawrence Velazquez.
469    
470  16. Partial matches now set offsets[2] to the "bumpalong" value, that is, the  16. Partial matches now set offsets[2] to the "bumpalong" value, that is, the
471      offset of the starting point of the matching process, provided the offsets      offset of the starting point of the matching process, provided the offsets
472      vector is large enough.      vector is large enough.
473    
474  17. The \A escape now records a lookbehind value of 1, though its execution  17. The \A escape now records a lookbehind value of 1, though its execution
475      does not actually inspect the previous character. This is to ensure that,      does not actually inspect the previous character. This is to ensure that,
476      in partial multi-segment matching, at least one character from the old      in partial multi-segment matching, at least one character from the old
# Line 71  Version 8.33 xx-xxxx-201x Line 478  Version 8.33 xx-xxxx-201x
478      are no lookbehinds in the pattern, \A might match incorrectly at the start      are no lookbehinds in the pattern, \A might match incorrectly at the start
479      of a new segment.      of a new segment.
480    
481    18. Added some #ifdef __VMS code into pcretest.c to help VMS implementations.
482    
483    19. Redefined some pcre_uchar variables in pcre_exec.c as pcre_uint32; this
484        gives some modest performance improvement in 8-bit mode.
485    
486    20. Added the PCRE-specific property \p{Xuc} for matching characters that can
487        be expressed in certain programming languages using Universal Character
488        Names.
489    
490    21. Unicode validation has been updated in the light of Unicode Corrigendum #9,
491        which points out that "non characters" are not "characters that may not
492        appear in Unicode strings" but rather "characters that are reserved for
493        internal use and have only local meaning".
494    
495    22. When a pattern was compiled with automatic callouts (PCRE_AUTO_CALLOUT) and
496        there was a conditional group that depended on an assertion, if the
497        assertion was false, the callout that immediately followed the alternation
498        in the condition was skipped when pcre_exec() was used for matching.
499    
500    23. Allow an explicit callout to be inserted before an assertion that is the
501        condition for a conditional group, for compatibility with automatic
502        callouts, which always insert a callout at this point.
503    
504    24. In 8.31, (*COMMIT) was confined to within a recursive subpattern. Perl also
505        confines (*SKIP) and (*PRUNE) in the same way, and this has now been done.
506    
507    25. (*PRUNE) is now supported by the JIT compiler.
508    
509    26. Fix infinite loop when /(?<=(*SKIP)ac)a/ is matched against aa.
510    
511    27. Fix the case where there are two or more SKIPs with arguments that may be
512        ignored.
513    
514    28. (*SKIP) is now supported by the JIT compiler.
515    
516    29. (*THEN) is now supported by the JIT compiler.
517    
518    30. Update RunTest with additional test selector options.
519    
520    31. The way PCRE handles backtracking verbs has been changed in two ways.
521    
522        (1) Previously, in something like (*COMMIT)(*SKIP), COMMIT would override
523        SKIP. Now, PCRE acts on whichever backtracking verb is reached first by
524        backtracking. In some cases this makes it more Perl-compatible, but Perl's
525        rather obscure rules do not always do the same thing.
526    
527        (2) Previously, backtracking verbs were confined within assertions. This is
528        no longer the case for positive assertions, except for (*ACCEPT). Again,
529        this sometimes improves Perl compatibility, and sometimes does not.
530    
531    32. A number of tests that were in test 2 because Perl did things differently
532        have been moved to test 1, because either Perl or PCRE has changed, and
533        these tests are now compatible.
534    
535    32. Backtracking control verbs are now handled in the same way in JIT and
536        interpreter.
537    
538    33. An opening parenthesis in a MARK/PRUNE/SKIP/THEN name in a pattern that
539        contained a forward subroutine reference caused a compile error.
540    
541    34. Auto-detect and optimize limited repetitions in JIT.
542    
543    35. Implement PCRE_NEVER_UTF to lock out the use of UTF, in particular,
544        blocking (*UTF) etc.
545    
546    36. In the interpreter, maximizing pattern repetitions for characters and
547        character types now use tail recursion, which reduces stack usage.
548    
549    37. The value of the max lookbehind was not correctly preserved if a compiled
550        and saved regex was reloaded on a host of different endianness.
551    
552    38. Implemented (*LIMIT_MATCH) and (*LIMIT_RECURSION). As part of the extension
553        of the compiled pattern block, expand the flags field from 16 to 32 bits
554        because it was almost full.
555    
556    39. Try madvise first before posix_madvise.
557    
558    40. Change 7 for PCRE 7.9 made it impossible for pcregrep to find empty lines
559        with a pattern such as ^$. It has taken 4 years for anybody to notice! The
560        original change locked out all matches of empty strings. This has been
561        changed so that one match of an empty string per line is recognized.
562        Subsequent searches on the same line (for colouring or for --only-matching,
563        for example) do not recognize empty strings.
564    
565    41. Applied a user patch to fix a number of spelling mistakes in comments.
566    
567    42. Data lines longer than 65536 caused pcretest to crash.
568    
569    43. Clarified the data type for length and startoffset arguments for pcre_exec
570        and pcre_dfa_exec in the function-specific man pages, where they were
571        explicitly stated to be in bytes, never having been updated. I also added
572        some clarification to the pcreapi man page.
573    
574    44. A call to pcre_dfa_exec() with an output vector size less than 2 caused
575        a segmentation fault.
576    
577    
578  Version 8.32 30-November-2012  Version 8.32 30-November-2012
579  -----------------------------  -----------------------------
# Line 1579  Version 7.9 11-Apr-09 Line 2082  Version 7.9 11-Apr-09
2082  7.  A pattern that could match an empty string could cause pcregrep to loop; it  7.  A pattern that could match an empty string could cause pcregrep to loop; it
2083      doesn't make sense to accept an empty string match in pcregrep, so I have      doesn't make sense to accept an empty string match in pcregrep, so I have
2084      locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this      locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
2085      seems to be how GNU grep behaves.      seems to be how GNU grep behaves. [But see later change 40 for release
2086        8.33.]
2087    
2088  8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at  8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
2089      start or after a newline", because the conditional assertion was not being      start or after a newline", because the conditional assertion was not being
# Line 1822  Version 7.7 07-May-08 Line 2326  Version 7.7 07-May-08
2326      containing () gave an internal compiling error instead of "reference to      containing () gave an internal compiling error instead of "reference to
2327      non-existent subpattern". Fortunately, when the pattern did exist, the      non-existent subpattern". Fortunately, when the pattern did exist, the
2328      compiled code was correct. (When scanning forwards to check for the      compiled code was correct. (When scanning forwards to check for the
2329      existencd of the subpattern, it was treating the data ']' as terminating      existence of the subpattern, it was treating the data ']' as terminating
2330      the class, so got the count wrong. When actually compiling, the reference      the class, so got the count wrong. When actually compiling, the reference
2331      was subsequently set up correctly.)      was subsequently set up correctly.)
2332    

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