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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.11 10-Oct-2010  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    17. Fixed a number of memory leaks in pcregrep.
83    
84    18. Avoid a compiler warning (from some compilers) for a function call with
85        a cast that removes "const" from an lvalue by using an intermediate
86        variable (to which the compiler does not object).
87    
88    19. Incorrect code was compiled if a group that contained an internal recursive
89        back reference was optional (had quantifier with a minimum of zero). This
90        example compiled incorrect code: /(((a\2)|(a*)\g<-1>))*/ and other examples
91        caused segmentation faults because of stack overflows at compile time.
92    
93    
94    Version 8.35 04-April-2014
95    --------------------------
96    
97    1.  A new flag is set, when property checks are present in an XCLASS.
98        When this flag is not set, PCRE can perform certain optimizations
99        such as studying these XCLASS-es.
100    
101    2.  The auto-possessification of character sets were improved: a normal
102        and an extended character set can be compared now. Furthermore
103        the JIT compiler optimizes more character set checks.
104    
105    3.  Got rid of some compiler warnings for potentially uninitialized variables
106        that show up only when compiled with -O2.
107    
108    4.  A pattern such as (?=ab\K) that uses \K in an assertion can set the start
109        of a match later then the end of the match. The pcretest program was not
110        handling the case sensibly - it was outputting from the start to the next
111        binary zero. It now reports this situation in a message, and outputs the
112        text from the end to the start.
113    
114    5.  Fast forward search is improved in JIT. Instead of the first three
115        characters, any three characters with fixed position can be searched.
116        Search order: first, last, middle.
117    
118    6.  Improve character range checks in JIT. Characters are read by an inprecise
119        function now, which returns with an unknown value if the character code is
120        above a certain threshold (e.g: 256). The only limitation is that the value
121        must be bigger than the threshold as well. This function is useful when
122        the characters above the threshold are handled in the same way.
123    
124    7.  The macros whose names start with RAWUCHAR are placeholders for a future
125        mode in which only the bottom 21 bits of 32-bit data items are used. To
126        make this more memorable for those maintaining the code, the names have
127        been changed to start with UCHAR21, and an extensive comment has been added
128        to their definition.
129    
130    8.  Add missing (new) files sljitNativeTILEGX.c and sljitNativeTILEGX-encoder.c
131        to the export list in Makefile.am (they were accidentally omitted from the
132        8.34 tarball).
133    
134    9.  The informational output from pcretest used the phrase "starting byte set"
135        which is inappropriate for the 16-bit and 32-bit libraries. As the output
136        for "first char" and "need char" really means "non-UTF-char", I've changed
137        "byte" to "char", and slightly reworded the output. The documentation about
138        these values has also been (I hope) clarified.
139    
140    10. Another JIT related optimization: use table jumps for selecting the correct
141        backtracking path, when more than four alternatives are present inside a
142        bracket.
143    
144    11. Empty match is not possible, when the minimum length is greater than zero,
145        and there is no \K in the pattern. JIT should avoid empty match checks in
146        such cases.
147    
148    12. In a caseless character class with UCP support, when a character with more
149        than one alternative case was not the first character of a range, not all
150        the alternative cases were added to the class. For example, s and \x{17f}
151        are both alternative cases for S: the class [RST] was handled correctly,
152        but [R-T] was not.
153    
154    13. The configure.ac file always checked for pthread support when JIT was
155        enabled. This is not used in Windows, so I have put this test inside a
156        check for the presence of windows.h (which was already tested for).
157    
158    14. Improve pattern prefix search by a simplified Boyer-Moore algorithm in JIT.
159        The algorithm provides a way to skip certain starting offsets, and usually
160        faster than linear prefix searches.
161    
162    15. Change 13 for 8.20 updated RunTest to check for the 'fr' locale as well
163        as for 'fr_FR' and 'french'. For some reason, however, it then used the
164        Windows-specific input and output files, which have 'french' screwed in.
165        So this could never have worked. One of the problems with locales is that
166        they aren't always the same. I have now updated RunTest so that it checks
167        the output of the locale test (test 3) against three different output
168        files, and it allows the test to pass if any one of them matches. With luck
169        this should make the test pass on some versions of Solaris where it was
170        failing. Because of the uncertainty, the script did not used to stop if
171        test 3 failed; it now does. If further versions of a French locale ever
172        come to light, they can now easily be added.
173    
174    16. If --with-pcregrep-bufsize was given a non-integer value such as "50K",
175        there was a message during ./configure, but it did not stop. This now
176        provokes an error. The invalid example in README has been corrected.
177        If a value less than the minimum is given, the minimum value has always
178        been used, but now a warning is given.
179    
180    17. If --enable-bsr-anycrlf was set, the special 16/32-bit test failed. This
181        was a bug in the test system, which is now fixed. Also, the list of various
182        configurations that are tested for each release did not have one with both
183        16/32 bits and --enable-bar-anycrlf. It now does.
184    
185    18. pcretest was missing "-C bsr" for displaying the \R default setting.
186    
187    19. Little endian PowerPC systems are supported now by the JIT compiler.
188    
189    20. The fast forward newline mechanism could enter to an infinite loop on
190        certain invalid UTF-8 input. Although we don't support these cases
191        this issue can be fixed by a performance optimization.
192    
193    21. Change 33 of 8.34 is not sufficient to ensure stack safety because it does
194        not take account if existing stack usage. There is now a new global
195        variable called pcre_stack_guard that can be set to point to an external
196        function to check stack availability. It is called at the start of
197        processing every parenthesized group.
198    
199    22. A typo in the code meant that in ungreedy mode the max/min qualifier
200        behaved like a min-possessive qualifier, and, for example, /a{1,3}b/U did
201        not match "ab".
202    
203    23. When UTF was disabled, the JIT program reported some incorrect compile
204        errors. These messages are silenced now.
205    
206    24. Experimental support for ARM-64 and MIPS-64 has been added to the JIT
207        compiler.
208    
209    25. Change all the temporary files used in RunGrepTest to be different to those
210        used by RunTest so that the tests can be run simultaneously, for example by
211        "make -j check".
212    
213    
214    Version 8.34 15-December-2013
215    -----------------------------
216    
217    1.  Add pcre[16|32]_jit_free_unused_memory to forcibly free unused JIT
218        executable memory. Patch inspired by Carsten Klein.
219    
220    2.  ./configure --enable-coverage defined SUPPORT_GCOV in config.h, although
221        this macro is never tested and has no effect, because the work to support
222        coverage involves only compiling and linking options and special targets in
223        the Makefile. The comment in config.h implied that defining the macro would
224        enable coverage support, which is totally false. There was also support for
225        setting this macro in the CMake files (my fault, I just copied it from
226        configure). SUPPORT_GCOV has now been removed.
227    
228    3.  Make a small performance improvement in strlen16() and strlen32() in
229        pcretest.
230    
231    4.  Change 36 for 8.33 left some unreachable statements in pcre_exec.c,
232        detected by the Solaris compiler (gcc doesn't seem to be able to diagnose
233        these cases). There was also one in pcretest.c.
234    
235    5.  Cleaned up a "may be uninitialized" compiler warning in pcre_exec.c.
236    
237    6.  In UTF mode, the code for checking whether a group could match an empty
238        string (which is used for indefinitely repeated groups to allow for
239        breaking an infinite loop) was broken when the group contained a repeated
240        negated single-character class with a character that occupied more than one
241        data item and had a minimum repetition of zero (for example, [^\x{100}]* in
242        UTF-8 mode). The effect was undefined: the group might or might not be
243        deemed as matching an empty string, or the program might have crashed.
244    
245    7.  The code for checking whether a group could match an empty string was not
246        recognizing that \h, \H, \v, \V, and \R must match a character.
247    
248    8.  Implemented PCRE_INFO_MATCH_EMPTY, which yields 1 if the pattern can match
249        an empty string. If it can, pcretest shows this in its information output.
250    
251    9.  Fixed two related bugs that applied to Unicode extended grapheme clusters
252        that were repeated with a maximizing qualifier (e.g. \X* or \X{2,5}) when
253        matched by pcre_exec() without using JIT:
254    
255        (a) If the rest of the pattern did not match after a maximal run of
256            grapheme clusters, the code for backing up to try with fewer of them
257            did not always back up over a full grapheme when characters that do not
258            have the modifier quality were involved, e.g. Hangul syllables.
259    
260        (b) If the match point in a subject started with modifier character, and
261            there was no match, the code could incorrectly back up beyond the match
262            point, and potentially beyond the first character in the subject,
263            leading to a segfault or an incorrect match result.
264    
265    10. A conditional group with an assertion condition could lead to PCRE
266        recording an incorrect first data item for a match if no other first data
267        item was recorded. For example, the pattern (?(?=ab)ab) recorded "a" as a
268        first data item, and therefore matched "ca" after "c" instead of at the
269        start.
270    
271    11. Change 40 for 8.33 (allowing pcregrep to find empty strings) showed up a
272        bug that caused the command "echo a | ./pcregrep -M '|a'" to loop.
273    
274    12. The source of pcregrep now includes z/OS-specific code so that it can be
275        compiled for z/OS as part of the special z/OS distribution.
276    
277    13. Added the -T and -TM options to pcretest.
278    
279    14. The code in pcre_compile.c for creating the table of named capturing groups
280        has been refactored. Instead of creating the table dynamically during the
281        actual compiling pass, the information is remembered during the pre-compile
282        pass (on the stack unless there are more than 20 named groups, in which
283        case malloc() is used) and the whole table is created before the actual
284        compile happens. This has simplified the code (it is now nearly 150 lines
285        shorter) and prepared the way for better handling of references to groups
286        with duplicate names.
287    
288    15. A back reference to a named subpattern when there is more than one of the
289        same name now checks them in the order in which they appear in the pattern.
290        The first one that is set is used for the reference. Previously only the
291        first one was inspected. This change makes PCRE more compatible with Perl.
292    
293    16. Unicode character properties were updated from Unicode 6.3.0.
294    
295    17. The compile-time code for auto-possessification has been refactored, based
296        on a patch by Zoltan Herczeg. It now happens after instead of during
297        compilation. The code is cleaner, and more cases are handled. The option
298        PCRE_NO_AUTO_POSSESS is added for testing purposes, and the -O and /O
299        options in pcretest are provided to set it. It can also be set by
300        (*NO_AUTO_POSSESS) at the start of a pattern.
301    
302    18. The character VT has been added to the default ("C" locale) set of
303        characters that match \s and are generally treated as white space,
304        following this same change in Perl 5.18. There is now no difference between
305        "Perl space" and "POSIX space". Whether VT is treated as white space in
306        other locales depends on the locale.
307    
308    19. The code for checking named groups as conditions, either for being set or
309        for being recursed, has been refactored (this is related to 14 and 15
310        above). Processing unduplicated named groups should now be as fast at
311        numerical groups, and processing duplicated groups should be faster than
312        before.
313    
314    20. Two patches to the CMake build system, by Alexander Barkov:
315    
316          (1) Replace the "source" command by "." in CMakeLists.txt because
317              "source" is a bash-ism.
318    
319          (2) Add missing HAVE_STDINT_H and HAVE_INTTYPES_H to config-cmake.h.in;
320              without these the CMake build does not work on Solaris.
321    
322    21. Perl has changed its handling of \8 and \9. If there is no previously
323        encountered capturing group of those numbers, they are treated as the
324        literal characters 8 and 9 instead of a binary zero followed by the
325        literals. PCRE now does the same.
326    
327    22. Following Perl, added \o{} to specify codepoints in octal, making it
328        possible to specify values greater than 0777 and also making them
329        unambiguous.
330    
331    23. Perl now gives an error for missing closing braces after \x{... instead of
332        treating the string as literal. PCRE now does the same.
333    
334    24. RunTest used to grumble if an inappropriate test was selected explicitly,
335        but just skip it when running all tests. This make it awkward to run ranges
336        of tests when one of them was inappropriate. Now it just skips any
337        inappropriate tests, as it always did when running all tests.
338    
339    25. If PCRE_AUTO_CALLOUT and PCRE_UCP were set for a pattern that contained
340        character types such as \d or \w, too many callouts were inserted, and the
341        data that they returned was rubbish.
342    
343    26. In UCP mode, \s was not matching two of the characters that Perl matches,
344        namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they
345        were matched by \h. The code has now been refactored so that the lists of
346        the horizontal and vertical whitespace characters used for \h and \v (which
347        are defined only in one place) are now also used for \s.
348    
349    27. Add JIT support for the 64 bit TileGX architecture.
350        Patch by Jiong Wang (Tilera Corporation).
351    
352    28. Possessive quantifiers for classes (both explicit and automatically
353        generated) now use special opcodes instead of wrapping in ONCE brackets.
354    
355    29. Whereas an item such as A{4}+ ignored the possessivenes of the quantifier
356        (because it's meaningless), this was not happening when PCRE_CASELESS was
357        set. Not wrong, but inefficient.
358    
359    30. Updated perltest.pl to add /u (force Unicode mode) when /W (use Unicode
360        properties for \w, \d, etc) is present in a test regex. Otherwise if the
361        test contains no characters greater than 255, Perl doesn't realise it
362        should be using Unicode semantics.
363    
364    31. Upgraded the handling of the POSIX classes [:graph:], [:print:], and
365        [:punct:] when PCRE_UCP is set so as to include the same characters as Perl
366        does in Unicode mode.
367    
368    32. Added the "forbid" facility to pcretest so that putting tests into the
369        wrong test files can sometimes be quickly detected.
370    
371    33. There is now a limit (default 250) on the depth of nesting of parentheses.
372        This limit is imposed to control the amount of system stack used at compile
373        time. It can be changed at build time by --with-parens-nest-limit=xxx or
374        the equivalent in CMake.
375    
376    34. Character classes such as [A-\d] or [a-[:digit:]] now cause compile-time
377        errors. Perl warns for these when in warning mode, but PCRE has no facility
378        for giving warnings.
379    
380    35. Change 34 for 8.13 allowed quantifiers on assertions, because Perl does.
381        However, this was not working for (?!) because it is optimized to (*FAIL),
382        for which PCRE does not allow quantifiers. The optimization is now disabled
383        when a quantifier follows (?!). I can't see any use for this, but it makes
384        things uniform.
385    
386    36. Perl no longer allows group names to start with digits, so I have made this
387        change also in PCRE. It simplifies the code a bit.
388    
389    37. In extended mode, Perl ignores spaces before a + that indicates a
390        possessive quantifier. PCRE allowed a space before the quantifier, but not
391        before the possessive +. It now does.
392    
393    38. The use of \K (reset reported match start) within a repeated possessive
394        group such as (a\Kb)*+ was not working.
395    
396    40. Document that the same character tables must be used at compile time and
397        run time, and that the facility to pass tables to pcre_exec() and
398        pcre_dfa_exec() is for use only with saved/restored patterns.
399    
400    41. Applied Jeff Trawick's patch CMakeLists.txt, which "provides two new
401        features for Builds with MSVC:
402    
403        1. Support pcre.rc and/or pcreposix.rc (as is already done for MinGW
404           builds). The .rc files can be used to set FileDescription and many other
405           attributes.
406    
407        2. Add an option (-DINSTALL_MSVC_PDB) to enable installation of .pdb files.
408           This allows higher-level build scripts which want .pdb files to avoid
409           hard-coding the exact files needed."
410    
411    42. Added support for [[:<:]] and [[:>:]] as used in the BSD POSIX library to
412        mean "start of word" and "end of word", respectively, as a transition aid.
413    
414    43. A minimizing repeat of a class containing codepoints greater than 255 in
415        non-UTF 16-bit or 32-bit modes caused an internal error when PCRE was
416        compiled to use the heap for recursion.
417    
418    44. Got rid of some compiler warnings for unused variables when UTF but not UCP
419        is configured.
420    
421    
422    Version 8.33 28-May-2013
423    ------------------------
424    
425    1.  Added 'U' to some constants that are compared to unsigned integers, to
426        avoid compiler signed/unsigned warnings. Added (int) casts to unsigned
427        variables that are added to signed variables, to ensure the result is
428        signed and can be negated.
429    
430    2.  Applied patch by Daniel Richard G for quashing MSVC warnings to the
431        CMake config files.
432    
433    3.  Revise the creation of config.h.generic so that all boolean macros are
434        #undefined, whereas non-boolean macros are #ifndef/#endif-ed. This makes
435        overriding via -D on the command line possible.
436    
437    4.  Changing the definition of the variable "op" in pcre_exec.c from pcre_uchar
438        to unsigned int is reported to make a quite noticeable speed difference in
439        a specific Windows environment. Testing on Linux did also appear to show
440        some benefit (and it is clearly not harmful). Also fixed the definition of
441        Xop which should be unsigned.
442    
443    5.  Related to (4), changing the definition of the intermediate variable cc
444        in repeated character loops from pcre_uchar to pcre_uint32 also gave speed
445        improvements.
446    
447    6.  Fix forward search in JIT when link size is 3 or greater. Also removed some
448        unnecessary spaces.
449    
450    7.  Adjust autogen.sh and configure.ac to lose warnings given by automake 1.12
451        and later.
452    
453    8.  Fix two buffer over read issues in 16 and 32 bit modes. Affects JIT only.
454    
455    9.  Optimizing fast_forward_start_bits in JIT.
456    
457    10. Adding support for callouts in JIT, and fixing some issues revealed
458        during this work. Namely:
459    
460        (a) Unoptimized capturing brackets incorrectly reset on backtrack.
461    
462        (b) Minimum length was not checked before the matching is started.
463    
464    11. The value of capture_last that is passed to callouts was incorrect in some
465        cases when there was a capture on one path that was subsequently abandoned
466        after a backtrack. Also, the capture_last value is now reset after a
467        recursion, since all captures are also reset in this case.
468    
469    12. The interpreter no longer returns the "too many substrings" error in the
470        case when an overflowing capture is in a branch that is subsequently
471        abandoned after a backtrack.
472    
473    13. In the pathological case when an offset vector of size 2 is used, pcretest
474        now prints out the matched string after a yield of 0 or 1.
475    
476    14. Inlining subpatterns in recursions, when certain conditions are fulfilled.
477        Only supported by the JIT compiler at the moment.
478    
479    15. JIT compiler now supports 32 bit Macs thanks to Lawrence Velazquez.
480    
481    16. Partial matches now set offsets[2] to the "bumpalong" value, that is, the
482        offset of the starting point of the matching process, provided the offsets
483        vector is large enough.
484    
485    17. The \A escape now records a lookbehind value of 1, though its execution
486        does not actually inspect the previous character. This is to ensure that,
487        in partial multi-segment matching, at least one character from the old
488        segment is retained when a new segment is processed. Otherwise, if there
489        are no lookbehinds in the pattern, \A might match incorrectly at the start
490        of a new segment.
491    
492    18. Added some #ifdef __VMS code into pcretest.c to help VMS implementations.
493    
494    19. Redefined some pcre_uchar variables in pcre_exec.c as pcre_uint32; this
495        gives some modest performance improvement in 8-bit mode.
496    
497    20. Added the PCRE-specific property \p{Xuc} for matching characters that can
498        be expressed in certain programming languages using Universal Character
499        Names.
500    
501    21. Unicode validation has been updated in the light of Unicode Corrigendum #9,
502        which points out that "non characters" are not "characters that may not
503        appear in Unicode strings" but rather "characters that are reserved for
504        internal use and have only local meaning".
505    
506    22. When a pattern was compiled with automatic callouts (PCRE_AUTO_CALLOUT) and
507        there was a conditional group that depended on an assertion, if the
508        assertion was false, the callout that immediately followed the alternation
509        in the condition was skipped when pcre_exec() was used for matching.
510    
511    23. Allow an explicit callout to be inserted before an assertion that is the
512        condition for a conditional group, for compatibility with automatic
513        callouts, which always insert a callout at this point.
514    
515    24. In 8.31, (*COMMIT) was confined to within a recursive subpattern. Perl also
516        confines (*SKIP) and (*PRUNE) in the same way, and this has now been done.
517    
518    25. (*PRUNE) is now supported by the JIT compiler.
519    
520    26. Fix infinite loop when /(?<=(*SKIP)ac)a/ is matched against aa.
521    
522    27. Fix the case where there are two or more SKIPs with arguments that may be
523        ignored.
524    
525    28. (*SKIP) is now supported by the JIT compiler.
526    
527    29. (*THEN) is now supported by the JIT compiler.
528    
529    30. Update RunTest with additional test selector options.
530    
531    31. The way PCRE handles backtracking verbs has been changed in two ways.
532    
533        (1) Previously, in something like (*COMMIT)(*SKIP), COMMIT would override
534        SKIP. Now, PCRE acts on whichever backtracking verb is reached first by
535        backtracking. In some cases this makes it more Perl-compatible, but Perl's
536        rather obscure rules do not always do the same thing.
537    
538        (2) Previously, backtracking verbs were confined within assertions. This is
539        no longer the case for positive assertions, except for (*ACCEPT). Again,
540        this sometimes improves Perl compatibility, and sometimes does not.
541    
542    32. A number of tests that were in test 2 because Perl did things differently
543        have been moved to test 1, because either Perl or PCRE has changed, and
544        these tests are now compatible.
545    
546    32. Backtracking control verbs are now handled in the same way in JIT and
547        interpreter.
548    
549    33. An opening parenthesis in a MARK/PRUNE/SKIP/THEN name in a pattern that
550        contained a forward subroutine reference caused a compile error.
551    
552    34. Auto-detect and optimize limited repetitions in JIT.
553    
554    35. Implement PCRE_NEVER_UTF to lock out the use of UTF, in particular,
555        blocking (*UTF) etc.
556    
557    36. In the interpreter, maximizing pattern repetitions for characters and
558        character types now use tail recursion, which reduces stack usage.
559    
560    37. The value of the max lookbehind was not correctly preserved if a compiled
561        and saved regex was reloaded on a host of different endianness.
562    
563    38. Implemented (*LIMIT_MATCH) and (*LIMIT_RECURSION). As part of the extension
564        of the compiled pattern block, expand the flags field from 16 to 32 bits
565        because it was almost full.
566    
567    39. Try madvise first before posix_madvise.
568    
569    40. Change 7 for PCRE 7.9 made it impossible for pcregrep to find empty lines
570        with a pattern such as ^$. It has taken 4 years for anybody to notice! The
571        original change locked out all matches of empty strings. This has been
572        changed so that one match of an empty string per line is recognized.
573        Subsequent searches on the same line (for colouring or for --only-matching,
574        for example) do not recognize empty strings.
575    
576    41. Applied a user patch to fix a number of spelling mistakes in comments.
577    
578    42. Data lines longer than 65536 caused pcretest to crash.
579    
580    43. Clarified the data type for length and startoffset arguments for pcre_exec
581        and pcre_dfa_exec in the function-specific man pages, where they were
582        explicitly stated to be in bytes, never having been updated. I also added
583        some clarification to the pcreapi man page.
584    
585    44. A call to pcre_dfa_exec() with an output vector size less than 2 caused
586        a segmentation fault.
587    
588    
589    Version 8.32 30-November-2012
590    -----------------------------
591    
592    1.  Improved JIT compiler optimizations for first character search and single
593        character iterators.
594    
595    2.  Supporting IBM XL C compilers for PPC architectures in the JIT compiler.
596        Patch by Daniel Richard G.
597    
598    3.  Single character iterator optimizations in the JIT compiler.
599    
600    4.  Improved JIT compiler optimizations for character ranges.
601    
602    5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
603        Reported by Giuseppe D'Angelo.
604    
605    6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
606        of a line, was being set incorrectly in cases where .* appeared inside
607        atomic brackets at the start of a pattern, or where there was a subsequent
608        *PRUNE or *SKIP.
609    
610    7.  Improved instruction cache flush for POWER/PowerPC.
611        Patch by Daniel Richard G.
612    
613    8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
614        grep:
615    
616        (a) There is now no limit to the number of patterns to be matched.
617    
618        (b) An error is given if a pattern is too long.
619    
620        (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
621            are now supported.
622    
623        (d) --exclude-from and --include-from (multiple use) have been added.
624    
625        (e) Exclusions and inclusions now apply to all files and directories, not
626            just to those obtained from scanning a directory recursively.
627    
628        (f) Multiple uses of -f and --file-list are now supported.
629    
630        (g) In a Windows environment, the default for -d has been changed from
631            "read" (the GNU grep default) to "skip", because otherwise the presence
632            of a directory in the file list provokes an error.
633    
634        (h) The documentation has been revised and clarified in places.
635    
636    9.  Improve the matching speed of capturing brackets.
637    
638    10. Changed the meaning of \X so that it now matches a Unicode extended
639        grapheme cluster.
640    
641    11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
642        out POSIX threads when JIT support is configured.
643    
644    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
645    
646    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
647        structure could go wrong in environments where size_t is not the same size
648        as int.
649    
650    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
651        set.
652    
653    15. The EBCDIC support had decayed; later updates to the code had included
654        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
655        general tidy up of EBCDIC-related issues, and the documentation was also
656        not quite right. There is now a test that can be run on ASCII systems to
657        check some of the EBCDIC-related things (but is it not a full test).
658    
659    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
660        in a small tidy to the code.
661    
662    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
663    
664    18. If the --only-matching (-o) option in pcregrep is specified multiple
665        times, each one causes appropriate output. For example, -o1 -o2 outputs the
666        substrings matched by the 1st and 2nd capturing parentheses. A separating
667        string can be specified by --om-separator (default empty).
668    
669    19. Improving the first n character searches.
670    
671    20. Turn case lists for horizontal and vertical white space into macros so that
672        they are defined only once.
673    
674    21. This set of changes together give more compatible Unicode case-folding
675        behaviour for characters that have more than one other case when UCP
676        support is available.
677    
678        (a) The Unicode property table now has offsets into a new table of sets of
679            three or more characters that are case-equivalent. The MultiStage2.py
680            script that generates these tables (the pcre_ucd.c file) now scans
681            CaseFolding.txt instead of UnicodeData.txt for character case
682            information.
683    
684        (b) The code for adding characters or ranges of characters to a character
685            class has been abstracted into a generalized function that also handles
686            case-independence. In UTF-mode with UCP support, this uses the new data
687            to handle characters with more than one other case.
688    
689        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
690            whose other case is greater than 256 are now correctly matched
691            caselessly. Previously, the high codepoint matched the low one, but not
692            vice versa.
693    
694        (d) The processing of \h, \H, \v, and \ in character classes now makes use
695            of the new class addition function, using character lists defined as
696            macros alongside the case definitions of 20 above.
697    
698        (e) Caseless back references now work with characters that have more than
699            one other case.
700    
701        (f) General caseless matching of characters with more than one other case
702            is supported.
703    
704    22. Unicode character properties were updated from Unicode 6.2.0
705    
706    23. Improved CMake support under Windows. Patch by Daniel Richard G.
707    
708    24. Add support for 32-bit character strings, and UTF-32
709    
710    25. Major JIT compiler update (code refactoring and bugfixing).
711        Experimental Sparc 32 support is added.
712    
713    26. Applied a modified version of Daniel Richard G's patch to create
714        pcre.h.generic and config.h.generic by "make" instead of in the
715        PrepareRelease script.
716    
717    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
718        pcre_compile.c when checking for a zero character.
719    
720    28. Introducing a native interface for JIT. Through this interface, the compiled
721        machine code can be directly executed. The purpose of this interface is to
722        provide fast pattern matching, so several sanity checks are not performed.
723        However, feature tests are still performed. The new interface provides
724        1.4x speedup compared to the old one.
725    
726    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
727        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
728        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
729    
730    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
731        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
732        the "old" RFC 2279). Instead, it ended up passing a negative length to
733        pcre_exec().
734    
735    31. Add support for GCC's visibility feature to hide internal functions.
736    
737    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
738        "unknown -C option" after outputting 0 or 1.
739    
740    33. There is now support for generating a code coverage report for the test
741        suite in environments where gcc is the compiler and lcov is installed. This
742        is mainly for the benefit of the developers.
743    
744    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
745        unaddressable using valgrind annotations, allowing valgrind to detect
746        invalid memory accesses. This is mainly for the benefit of the developers.
747    
748    25. (*UTF) can now be used to start a pattern in any of the three libraries.
749    
750    26. Give configure error if --enable-cpp but no C++ compiler found.
751    
752    
753    Version 8.31 06-July-2012
754    -------------------------
755    
756    1.  Fixing a wrong JIT test case and some compiler warnings.
757    
758    2.  Removed a bashism from the RunTest script.
759    
760    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
761        to unsigned type, result still unsigned" that was given by an MS compiler
762        on encountering the code "-sizeof(xxx)".
763    
764    4.  Partial matching support is added to the JIT compiler.
765    
766    5.  Fixed several bugs concerned with partial matching of items that consist
767        of more than one character:
768    
769        (a) /^(..)\1/ did not partially match "aba" because checking references was
770            done on an "all or nothing" basis. This also applied to repeated
771            references.
772    
773        (b) \R did not give a hard partial match if \r was found at the end of the
774            subject.
775    
776        (c) \X did not give a hard partial match after matching one or more
777            characters at the end of the subject.
778    
779        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
780            a partial match for the string "\r".
781    
782        (e) When newline was set to CRLF, the metacharacter "." did not recognize
783            a partial match for a CR character at the end of the subject string.
784    
785    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
786        running pcretest, the text "(JIT)" added to the output whenever JIT is
787        actually used to run the match.
788    
789    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
790        or /S+[+] with a digit between 1 and 7.
791    
792    8.  OP_NOT now supports any UTF character not just single-byte ones.
793    
794    9.  (*MARK) control verb is now supported by the JIT compiler.
795    
796    10. The command "./RunTest list" lists the available tests without actually
797        running any of them. (Because I keep forgetting what they all are.)
798    
799    11. Add PCRE_INFO_MAXLOOKBEHIND.
800    
801    12. Applied a (slightly modified) user-supplied patch that improves performance
802        when the heap is used for recursion (compiled with --disable-stack-for-
803        recursion). Instead of malloc and free for each heap frame each time a
804        logical recursion happens, frames are retained on a chain and re-used where
805        possible. This sometimes gives as much as 30% improvement.
806    
807    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
808        call.
809    
810    14. As documented, (*COMMIT) is now confined to within a positive assertion.
811    
812    15. It is now possible to link pcretest with libedit as an alternative to
813        libreadline.
814    
815    16. (*COMMIT) control verb is now supported by the JIT compiler.
816    
817    17. The Unicode data tables have been updated to Unicode 6.1.0.
818    
819    18. Added --file-list option to pcregrep.
820    
821    19. Added binary file support to pcregrep, including the -a, --binary-files,
822        -I, and --text options.
823    
824    20. The madvise function is renamed for posix_madvise for QNX compatibility
825        reasons. Fixed by Giuseppe D'Angelo.
826    
827    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
828    
829    22. Changed the option for creating symbolic links for 16-bit man pages from
830        -s to -sf so that re-installing does not cause issues.
831    
832    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
833    
834    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
835        matches in certain environments (the workspace was not being correctly
836        retained). Also added to pcre_dfa_exec() a simple plausibility check on
837        some of the workspace data at the beginning of a restart.
838    
839    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
840        was not doing so when it should - probably a typo introduced by SVN 528
841        (change 8.10/14).
842    
843    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
844        \w+ when the character tables indicated that \x{c4} was a word character.
845        There were several related cases, all because the tests for doing a table
846        lookup were testing for characters less than 127 instead of 255.
847    
848    27. If a pattern contains capturing parentheses that are not used in a match,
849        their slots in the ovector are set to -1. For those that are higher than
850        any matched groups, this happens at the end of processing. In the case when
851        there were back references that the ovector was too small to contain
852        (causing temporary malloc'd memory to be used during matching), and the
853        highest capturing number was not used, memory off the end of the ovector
854        was incorrectly being set to -1. (It was using the size of the temporary
855        memory instead of the true size.)
856    
857    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
858        ovector size, it uses memory at the end of the block that it has got.
859    
860    29. Check for an overlong MARK name and give an error at compile time. The
861        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
862    
863    30. JIT compiler update.
864    
865    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
866        Rill for the patch.
867    
868    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
869    
870    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
871    
872    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
873        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
874        was enabled.
875    
876    35. Improve JIT code generation for greedy plus quantifier.
877    
878    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
879        1 to "aa" instead of to an empty string. The bug affected repeated groups
880        that could potentially match an empty string.
881    
882    37. Optimizing single character iterators in JIT.
883    
884    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
885        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
886        codepoints that are too big for the mode are faulted, and in a UTF mode,
887        disallowed codepoints are also faulted.
888    
889    39. If PCRE was compiled with UTF support, in three places in the DFA
890        matcher there was code that should only have been obeyed in UTF mode, but
891        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
892        processing when bytes with values greater than 127 were present. In 16-bit
893        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
894        both cases the values are those that cannot be the first data item in a UTF
895        character. The three items that might have provoked this were recursions,
896        possessively repeated groups, and atomic groups.
897    
898    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
899        and pcregrep, because some OS require shared objects to be explicitly
900        passed to ld, causing the link step to fail if they are not.
901    
902    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
903        mode, patterns that started with \h* or \R* might be incorrectly matched.
904    
905    
906    Version 8.30 04-February-2012
907    -----------------------------
908    
909    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
910        name is defined in ctype.h.
911    
912    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
913        only in quite long subpatterns.
914    
915    3.  Removed the function pcre_info(), which has been obsolete and deprecated
916        since it was replaced by pcre_fullinfo() in February 2000.
917    
918    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
919        match a (*MARK), and the match failed at the start of the subject, a
920        reference to memory before the start of the subject could occur. This bug
921        was introduced by fix 17 of release 8.21.
922    
923    5.  A reference to an unset group with zero minimum repetition was giving
924        totally wrong answers (in non-JavaScript-compatibility mode). For example,
925        /(another)?(\1?)test/ matched against "hello world test". This bug was
926        introduced in release 8.13.
927    
928    6.  Add support for 16-bit character strings (a large amount of work involving
929        many changes and refactorings).
930    
931    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
932        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
933        from a file.
934    
935    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
936        rounding is not applied in this particular case).
937    
938    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
939        if they appear, or are escaped, in patterns.
940    
941    10. Get rid of a number of -Wunused-but-set-variable warnings.
942    
943    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
944        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
945        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
946        also returns the mark "x". This bug applied to capturing parentheses,
947        non-capturing parentheses, and atomic parentheses. It also applied to some
948        assertions.
949    
950    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
951        information out of configure.ac instead of relying on pcre.h.generic, which
952        is not stored in the repository.
953    
954    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
955        -lreadline.
956    
957    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
958    
959    15. Applied Graycode's patch to put the top-level frame on the stack rather
960        than the heap when not using the stack for recursion. This gives a
961        performance improvement in many cases when recursion is not deep.
962    
963    16. Experimental code added to "pcretest -C" to output the stack frame size.
964    
965    
966    Version 8.21 12-Dec-2011
967    ------------------------
968    
969    1.  Updating the JIT compiler.
970    
971    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
972        are added as well.
973    
974    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
975        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
976        calling _pcre_jit_exec. Some extra comments are added.
977    
978    4.  (*MARK) settings inside atomic groups that do not contain any capturing
979        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
980        was introduced by change 18 for 8.20.
981    
982    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
983        ECMA-262 standard.
984    
985    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
986        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
987        This bug was probably introduced by change 9 of 8.13.
988    
989    7.  While fixing 6 above, I noticed that a number of other items were being
990        incorrectly rejected as "not fixed length". This arose partly because newer
991        opcodes had not been added to the fixed-length checking code. I have (a)
992        corrected the bug and added tests for these items, and (b) arranged for an
993        error to occur if an unknown opcode is encountered while checking for fixed
994        length instead of just assuming "not fixed length". The items that were
995        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
996        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
997        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
998    
999    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
1000        being incorrectly compiled and would have given unpredicatble results.
1001    
1002    9.  A possessively repeated subpattern with minimum repeat count greater than
1003        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
1004        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
1005        the first (A) could occur when it should not.
1006    
1007    10. Add a cast and remove a redundant test from the code.
1008    
1009    11. JIT should use pcre_malloc/pcre_free for allocation.
1010    
1011    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
1012        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
1013        is anything other than /usr, -L is still shown).
1014    
1015    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
1016    
1017    14. Perl does not support \N without a following name in a [] class; PCRE now
1018        also gives an error.
1019    
1020    15. If a forward reference was repeated with an upper limit of around 2000,
1021        it caused the error "internal error: overran compiling workspace". The
1022        maximum number of forward references (including repeats) was limited by the
1023        internal workspace, and dependent on the LINK_SIZE. The code has been
1024        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
1025        the default depends on LINK_SIZE. There is a new upper limit (for safety)
1026        of around 200,000 forward references. While doing this, I also speeded up
1027        the filling in of repeated forward references.
1028    
1029    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
1030        incorrectly expecting the subject to contain another "a" after the start.
1031    
1032    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
1033        in the match, the SKIP should be ignored. This was not happening; instead
1034        the SKIP was being treated as NOMATCH. For patterns such as
1035        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
1036        tested.
1037    
1038    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
1039        now much more compatible with Perl, in particular in cases where the result
1040        is a non-match for a non-anchored pattern. For example, if
1041        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
1042        "m", where previously it did not return a name. A side effect of this
1043        change is that for partial matches, the last encountered mark name is
1044        returned, as for non matches. A number of tests that were previously not
1045        Perl-compatible have been moved into the Perl-compatible test files. The
1046        refactoring has had the pleasing side effect of removing one argument from
1047        the match() function, thus reducing its stack requirements.
1048    
1049    19. If the /S+ option was used in pcretest to study a pattern using JIT,
1050        subsequent uses of /S (without +) incorrectly behaved like /S+.
1051    
1052    21. Retrieve executable code size support for the JIT compiler and fixing
1053        some warnings.
1054    
1055    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
1056        not work when the shorter character appeared right at the end of the
1057        subject string.
1058    
1059    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
1060        systems.
1061    
1062    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
1063        output it when the /M option is used in pcretest.
1064    
1065    25. The CheckMan script was not being included in the distribution. Also, added
1066        an explicit "perl" to run Perl scripts from the PrepareRelease script
1067        because this is reportedly needed in Windows.
1068    
1069    26. If study data was being save in a file and studying had not found a set of
1070        "starts with" bytes for the pattern, the data written to the file (though
1071        never used) was taken from uninitialized memory and so caused valgrind to
1072        complain.
1073    
1074    27. Updated RunTest.bat as provided by Sheri Pierce.
1075    
1076    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
1077    
1078    29. Computation of memory usage for the table of capturing group names was
1079        giving an unnecessarily large value.
1080    
1081    
1082    Version 8.20 21-Oct-2011
1083    ------------------------
1084    
1085    1.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had
1086        a POSIX class. After further experiments with Perl, which convinced me that
1087        Perl has bugs and confusions, a closing square bracket is no longer allowed
1088        in a POSIX name. This bug also affected patterns with classes that started
1089        with full stops.
1090    
1091    2.  If a pattern such as /(a)b|ac/ is matched against "ac", there is no
1092        captured substring, but while checking the failing first alternative,
1093        substring 1 is temporarily captured. If the output vector supplied to
1094        pcre_exec() was not big enough for this capture, the yield of the function
1095        was still zero ("insufficient space for captured substrings"). This cannot
1096        be totally fixed without adding another stack variable, which seems a lot
1097        of expense for a edge case. However, I have improved the situation in cases
1098        such as /(a)(b)x|abc/ matched against "abc", where the return code
1099        indicates that fewer than the maximum number of slots in the ovector have
1100        been set.
1101    
1102    3.  Related to (2) above: when there are more back references in a pattern than
1103        slots in the output vector, pcre_exec() uses temporary memory during
1104        matching, and copies in the captures as far as possible afterwards. It was
1105        using the entire output vector, but this conflicts with the specification
1106        that only 2/3 is used for passing back captured substrings. Now it uses
1107        only the first 2/3, for compatibility. This is, of course, another edge
1108        case.
1109    
1110    4.  Zoltan Herczeg's just-in-time compiler support has been integrated into the
1111        main code base, and can be used by building with --enable-jit. When this is
1112        done, pcregrep automatically uses it unless --disable-pcregrep-jit or the
1113        runtime --no-jit option is given.
1114    
1115    5.  When the number of matches in a pcre_dfa_exec() run exactly filled the
1116        ovector, the return from the function was zero, implying that there were
1117        other matches that did not fit. The correct "exactly full" value is now
1118        returned.
1119    
1120    6.  If a subpattern that was called recursively or as a subroutine contained
1121        (*PRUNE) or any other control that caused it to give a non-standard return,
1122        invalid errors such as "Error -26 (nested recursion at the same subject
1123        position)" or even infinite loops could occur.
1124    
1125    7.  If a pattern such as /a(*SKIP)c|b(*ACCEPT)|/ was studied, it stopped
1126        computing the minimum length on reaching *ACCEPT, and so ended up with the
1127        wrong value of 1 rather than 0. Further investigation indicates that
1128        computing a minimum subject length in the presence of *ACCEPT is difficult
1129        (think back references, subroutine calls), and so I have changed the code
1130        so that no minimum is registered for a pattern that contains *ACCEPT.
1131    
1132    8.  If (*THEN) was present in the first (true) branch of a conditional group,
1133        it was not handled as intended. [But see 16 below.]
1134    
1135    9.  Replaced RunTest.bat and CMakeLists.txt with improved versions provided by
1136        Sheri Pierce.
1137    
1138    10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that
1139        the first byte in a match must be "a".
1140    
1141    11. Change 17 for 8.13 increased the recursion depth for patterns like
1142        /a(?:.)*?a/ drastically. I've improved things by remembering whether a
1143        pattern contains any instances of (*THEN). If it does not, the old
1144        optimizations are restored. It would be nice to do this on a per-group
1145        basis, but at the moment that is not feasible.
1146    
1147    12. In some environments, the output of pcretest -C is CRLF terminated. This
1148        broke RunTest's code that checks for the link size. A single white space
1149        character after the value is now allowed for.
1150    
1151    13. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".
1152        For "fr", it uses the Windows-specific input and output files.
1153    
1154    14. If (*THEN) appeared in a group that was called recursively or as a
1155        subroutine, it did not work as intended. [But see next item.]
1156    
1157    15. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex
1158        pattern fragments (but not containing any | characters). If A and B are
1159        matched, but there is a failure in C so that it backtracks to (*THEN), PCRE
1160        was behaving differently to Perl. PCRE backtracked into A, but Perl goes to
1161        D. In other words, Perl considers parentheses that do not contain any |
1162        characters to be part of a surrounding alternative, whereas PCRE was
1163        treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles
1164        differently. PCRE now behaves in the same way as Perl, except in the case
1165        of subroutine/recursion calls such as (?1) which have in any case always
1166        been different (but PCRE had them first :-).
1167    
1168    16. Related to 15 above: Perl does not treat the | in a conditional group as
1169        creating alternatives. Such a group is treated in the same way as an
1170        ordinary group without any | characters when processing (*THEN). PCRE has
1171        been changed to match Perl's behaviour.
1172    
1173    17. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the
1174        RunGrepTest script failed.
1175    
1176    18. Change 22 for version 13 caused atomic groups to use more stack. This is
1177        inevitable for groups that contain captures, but it can lead to a lot of
1178        stack use in large patterns. The old behaviour has been restored for atomic
1179        groups that do not contain any capturing parentheses.
1180    
1181    19. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not
1182        suppress the check for a minimum subject length at run time. (If it was
1183        given to pcre_exec() or pcre_dfa_exec() it did work.)
1184    
1185    20. Fixed an ASCII-dependent infelicity in pcretest that would have made it
1186        fail to work when decoding hex characters in data strings in EBCDIC
1187        environments.
1188    
1189    21. It appears that in at least one Mac OS environment, the isxdigit() function
1190        is implemented as a macro that evaluates to its argument more than once,
1191        contravening the C 90 Standard (I haven't checked a later standard). There
1192        was an instance in pcretest which caused it to go wrong when processing
1193        \x{...} escapes in subject strings. The has been rewritten to avoid using
1194        things like p++ in the argument of isxdigit().
1195    
1196    
1197    Version 8.13 16-Aug-2011
1198    ------------------------
1199    
1200    1.  The Unicode data tables have been updated to Unicode 6.0.0.
1201    
1202    2.  Two minor typos in pcre_internal.h have been fixed.
1203    
1204    3.  Added #include <string.h> to pcre_scanner_unittest.cc, pcrecpp.cc, and
1205        pcrecpp_unittest.cc. They are needed for strcmp(), memset(), and strchr()
1206        in some environments (e.g. Solaris 10/SPARC using Sun Studio 12U2).
1207    
1208    4.  There were a number of related bugs in the code for matching backrefences
1209        caselessly in UTF-8 mode when codes for the characters concerned were
1210        different numbers of bytes. For example, U+023A and U+2C65 are an upper
1211        and lower case pair, using 2 and 3 bytes, respectively. The main bugs were:
1212        (a) A reference to 3 copies of a 2-byte code matched only 2 of a 3-byte
1213        code. (b) A reference to 2 copies of a 3-byte code would not match 2 of a
1214        2-byte code at the end of the subject (it thought there wasn't enough data
1215        left).
1216    
1217    5.  Comprehensive information about what went wrong is now returned by
1218        pcre_exec() and pcre_dfa_exec() when the UTF-8 string check fails, as long
1219        as the output vector has at least 2 elements. The offset of the start of
1220        the failing character and a reason code are placed in the vector.
1221    
1222    6.  When the UTF-8 string check fails for pcre_compile(), the offset that is
1223        now returned is for the first byte of the failing character, instead of the
1224        last byte inspected. This is an incompatible change, but I hope it is small
1225        enough not to be a problem. It makes the returned offset consistent with
1226        pcre_exec() and pcre_dfa_exec().
1227    
1228    7.  pcretest now gives a text phrase as well as the error number when
1229        pcre_exec() or pcre_dfa_exec() fails; if the error is a UTF-8 check
1230        failure, the offset and reason code are output.
1231    
1232    8.  When \R was used with a maximizing quantifier it failed to skip backwards
1233        over a \r\n pair if the subsequent match failed. Instead, it just skipped
1234        back over a single character (\n). This seems wrong (because it treated the
1235        two characters as a single entity when going forwards), conflicts with the
1236        documentation that \R is equivalent to (?>\r\n|\n|...etc), and makes the
1237        behaviour of \R* different to (\R)*, which also seems wrong. The behaviour
1238        has been changed.
1239    
1240    9.  Some internal refactoring has changed the processing so that the handling
1241        of the PCRE_CASELESS and PCRE_MULTILINE options is done entirely at compile
1242        time (the PCRE_DOTALL option was changed this way some time ago: version
1243        7.7 change 16). This has made it possible to abolish the OP_OPT op code,
1244        which was always a bit of a fudge. It also means that there is one less
1245        argument for the match() function, which reduces its stack requirements
1246        slightly. This change also fixes an incompatibility with Perl: the pattern
1247        (?i:([^b]))(?1) should not match "ab", but previously PCRE gave a match.
1248    
1249    10. More internal refactoring has drastically reduced the number of recursive
1250        calls to match() for possessively repeated groups such as (abc)++ when
1251        using pcre_exec().
1252    
1253    11. While implementing 10, a number of bugs in the handling of groups were
1254        discovered and fixed:
1255    
1256        (?<=(a)+) was not diagnosed as invalid (non-fixed-length lookbehind).
1257        (a|)*(?1) gave a compile-time internal error.
1258        ((a|)+)+  did not notice that the outer group could match an empty string.
1259        (^a|^)+   was not marked as anchored.
1260        (.*a|.*)+ was not marked as matching at start or after a newline.
1261    
1262    12. Yet more internal refactoring has removed another argument from the match()
1263        function. Special calls to this function are now indicated by setting a
1264        value in a variable in the "match data" data block.
1265    
1266    13. Be more explicit in pcre_study() instead of relying on "default" for
1267        opcodes that mean there is no starting character; this means that when new
1268        ones are added and accidentally left out of pcre_study(), testing should
1269        pick them up.
1270    
1271    14. The -s option of pcretest has been documented for ages as being an old
1272        synonym of -m (show memory usage). I have changed it to mean "force study
1273        for every regex", that is, assume /S for every regex. This is similar to -i
1274        and -d etc. It's slightly incompatible, but I'm hoping nobody is still
1275        using it. It makes it easier to run collections of tests with and without
1276        study enabled, and thereby test pcre_study() more easily. All the standard
1277        tests are now run with and without -s (but some patterns can be marked as
1278        "never study" - see 20 below).
1279    
1280    15. When (*ACCEPT) was used in a subpattern that was called recursively, the
1281        restoration of the capturing data to the outer values was not happening
1282        correctly.
1283    
1284    16. If a recursively called subpattern ended with (*ACCEPT) and matched an
1285        empty string, and PCRE_NOTEMPTY was set, pcre_exec() thought the whole
1286        pattern had matched an empty string, and so incorrectly returned a no
1287        match.
1288    
1289    17. There was optimizing code for the last branch of non-capturing parentheses,
1290        and also for the obeyed branch of a conditional subexpression, which used
1291        tail recursion to cut down on stack usage. Unfortunately, now that there is
1292        the possibility of (*THEN) occurring in these branches, tail recursion is
1293        no longer possible because the return has to be checked for (*THEN). These
1294        two optimizations have therefore been removed. [But see 8.20/11 above.]
1295    
1296    18. If a pattern containing \R was studied, it was assumed that \R always
1297        matched two bytes, thus causing the minimum subject length to be
1298        incorrectly computed because \R can also match just one byte.
1299    
1300    19. If a pattern containing (*ACCEPT) was studied, the minimum subject length
1301        was incorrectly computed.
1302    
1303    20. If /S is present twice on a test pattern in pcretest input, it now
1304        *disables* studying, thereby overriding the use of -s on the command line
1305        (see 14 above). This is necessary for one or two tests to keep the output
1306        identical in both cases.
1307    
1308    21. When (*ACCEPT) was used in an assertion that matched an empty string and
1309        PCRE_NOTEMPTY was set, PCRE applied the non-empty test to the assertion.
1310    
1311    22. When an atomic group that contained a capturing parenthesis was
1312        successfully matched, but the branch in which it appeared failed, the
1313        capturing was not being forgotten if a higher numbered group was later
1314        captured. For example, /(?>(a))b|(a)c/ when matching "ac" set capturing
1315        group 1 to "a", when in fact it should be unset. This applied to multi-
1316        branched capturing and non-capturing groups, repeated or not, and also to
1317        positive assertions (capturing in negative assertions does not happen
1318        in PCRE) and also to nested atomic groups.
1319    
1320    23. Add the ++ qualifier feature to pcretest, to show the remainder of the
1321        subject after a captured substring, to make it easier to tell which of a
1322        number of identical substrings has been captured.
1323    
1324    24. The way atomic groups are processed by pcre_exec() has been changed so that
1325        if they are repeated, backtracking one repetition now resets captured
1326        values correctly. For example, if ((?>(a+)b)+aabab) is matched against
1327        "aaaabaaabaabab" the value of captured group 2 is now correctly recorded as
1328        "aaa". Previously, it would have been "a". As part of this code
1329        refactoring, the way recursive calls are handled has also been changed.
1330    
1331    25. If an assertion condition captured any substrings, they were not passed
1332        back unless some other capturing happened later. For example, if
1333        (?(?=(a))a) was matched against "a", no capturing was returned.
1334    
1335    26. When studying a pattern that contained subroutine calls or assertions,
1336        the code for finding the minimum length of a possible match was handling
1337        direct recursions such as (xxx(?1)|yyy) but not mutual recursions (where
1338        group 1 called group 2 while simultaneously a separate group 2 called group
1339        1). A stack overflow occurred in this case. I have fixed this by limiting
1340        the recursion depth to 10.
1341    
1342    27. Updated RunTest.bat in the distribution to the version supplied by Tom
1343        Fortmann. This supports explicit test numbers on the command line, and has
1344        argument validation and error reporting.
1345    
1346    28. An instance of \X with an unlimited repeat could fail if at any point the
1347        first character it looked at was a mark character.
1348    
1349    29. Some minor code refactoring concerning Unicode properties and scripts
1350        should reduce the stack requirement of match() slightly.
1351    
1352    30. Added the '=' option to pcretest to check the setting of unused capturing
1353        slots at the end of the pattern, which are documented as being -1, but are
1354        not included in the return count.
1355    
1356    31. If \k was not followed by a braced, angle-bracketed, or quoted name, PCRE
1357        compiled something random. Now it gives a compile-time error (as does
1358        Perl).
1359    
1360    32. A *MARK encountered during the processing of a positive assertion is now
1361        recorded and passed back (compatible with Perl).
1362    
1363    33. If --only-matching or --colour was set on a pcregrep call whose pattern
1364        had alternative anchored branches, the search for a second match in a line
1365        was done as if at the line start. Thus, for example, /^01|^02/ incorrectly
1366        matched the line "0102" twice. The same bug affected patterns that started
1367        with a backwards assertion. For example /\b01|\b02/ also matched "0102"
1368        twice.
1369    
1370    34. Previously, PCRE did not allow quantification of assertions. However, Perl
1371        does, and because of capturing effects, quantifying parenthesized
1372        assertions may at times be useful. Quantifiers are now allowed for
1373        parenthesized assertions.
1374    
1375    35. A minor code tidy in pcre_compile() when checking options for \R usage.
1376    
1377    36. \g was being checked for fancy things in a character class, when it should
1378        just be a literal "g".
1379    
1380    37. PCRE was rejecting [:a[:digit:]] whereas Perl was not. It seems that the
1381        appearance of a nested POSIX class supersedes an apparent external class.
1382        For example, [:a[:digit:]b:] matches "a", "b", ":", or a digit. Also,
1383        unescaped square brackets may also appear as part of class names. For
1384        example, [:a[:abc]b:] gives unknown class "[:abc]b:]". PCRE now behaves
1385        more like Perl. (But see 8.20/1 above.)
1386    
1387    38. PCRE was giving an error for \N with a braced quantifier such as {1,} (this
1388        was because it thought it was \N{name}, which is not supported).
1389    
1390    39. Add minix to OS list not supporting the -S option in pcretest.
1391    
1392    40. PCRE tries to detect cases of infinite recursion at compile time, but it
1393        cannot analyze patterns in sufficient detail to catch mutual recursions
1394        such as ((?1))((?2)). There is now a runtime test that gives an error if a
1395        subgroup is called recursively as a subpattern for a second time at the
1396        same position in the subject string. In previous releases this might have
1397        been caught by the recursion limit, or it might have run out of stack.
1398    
1399    41. A pattern such as /(?(R)a+|(?R)b)/ is quite safe, as the recursion can
1400        happen only once. PCRE was, however incorrectly giving a compile time error
1401        "recursive call could loop indefinitely" because it cannot analyze the
1402        pattern in sufficient detail. The compile time test no longer happens when
1403        PCRE is compiling a conditional subpattern, but actual runaway loops are
1404        now caught at runtime (see 40 above).
1405    
1406    42. It seems that Perl allows any characters other than a closing parenthesis
1407        to be part of the NAME in (*MARK:NAME) and other backtracking verbs. PCRE
1408        has been changed to be the same.
1409    
1410    43. Updated configure.ac to put in more quoting round AC_LANG_PROGRAM etc. so
1411        as not to get warnings when autogen.sh is called. Also changed
1412        AC_PROG_LIBTOOL (deprecated) to LT_INIT (the current macro).
1413    
1414    44. To help people who use pcregrep to scan files containing exceedingly long
1415        lines, the following changes have been made:
1416    
1417        (a) The default value of the buffer size parameter has been increased from
1418            8K to 20K. (The actual buffer used is three times this size.)
1419    
1420        (b) The default can be changed by ./configure --with-pcregrep-bufsize when
1421            PCRE is built.
1422    
1423        (c) A --buffer-size=n option has been added to pcregrep, to allow the size
1424            to be set at run time.
1425    
1426        (d) Numerical values in pcregrep options can be followed by K or M, for
1427            example --buffer-size=50K.
1428    
1429        (e) If a line being scanned overflows pcregrep's buffer, an error is now
1430            given and the return code is set to 2.
1431    
1432    45. Add a pointer to the latest mark to the callout data block.
1433    
1434    46. The pattern /.(*F)/, when applied to "abc" with PCRE_PARTIAL_HARD, gave a
1435        partial match of an empty string instead of no match. This was specific to
1436        the use of ".".
1437    
1438    47. The pattern /f.*/8s, when applied to "for" with PCRE_PARTIAL_HARD, gave a
1439        complete match instead of a partial match. This bug was dependent on both
1440        the PCRE_UTF8 and PCRE_DOTALL options being set.
1441    
1442    48. For a pattern such as /\babc|\bdef/ pcre_study() was failing to set up the
1443        starting byte set, because \b was not being ignored.
1444    
1445    
1446    Version 8.12 15-Jan-2011
1447    ------------------------
1448    
1449    1.  Fixed some typos in the markup of the man pages, and wrote a script that
1450        checks for such things as part of the documentation building process.
1451    
1452    2.  On a big-endian 64-bit system, pcregrep did not correctly process the
1453        --match-limit and --recursion-limit options (added for 8.11). In
1454        particular, this made one of the standard tests fail. (The integer value
1455        went into the wrong half of a long int.)
1456    
1457    3.  If the --colour option was given to pcregrep with -v (invert match), it
1458        did strange things, either producing crazy output, or crashing. It should,
1459        of course, ignore a request for colour when reporting lines that do not
1460        match.
1461    
1462    4.  Another pcregrep bug caused similar problems if --colour was specified with
1463        -M (multiline) and the pattern match finished with a line ending.
1464    
1465    5.  In pcregrep, when a pattern that ended with a literal newline sequence was
1466        matched in multiline mode, the following line was shown as part of the
1467        match. This seems wrong, so I have changed it.
1468    
1469    6.  Another pcregrep bug in multiline mode, when --colour was specified, caused
1470        the check for further matches in the same line (so they could be coloured)
1471        to overrun the end of the current line. If another match was found, it was
1472        incorrectly shown (and then shown again when found in the next line).
1473    
1474    7.  If pcregrep was compiled under Windows, there was a reference to the
1475        function pcregrep_exit() before it was defined. I am assuming this was
1476        the cause of the "error C2371: 'pcregrep_exit' : redefinition;" that was
1477        reported by a user. I've moved the definition above the reference.
1478    
1479    
1480    Version 8.11 10-Dec-2010
1481  ------------------------  ------------------------
1482    
1483  1.  (*THEN) was not working properly if there were untried alternatives prior  1.  (*THEN) was not working properly if there were untried alternatives prior
1484      to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it      to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
1485      backtracked to try for "b" instead of moving to the next alternative branch      backtracked to try for "b" instead of moving to the next alternative branch
1486      at the same level (in this case, to look for "c"). The Perl documentation      at the same level (in this case, to look for "c"). The Perl documentation
1487      is clear that when (*THEN) is backtracked onto, it goes to the "next      is clear that when (*THEN) is backtracked onto, it goes to the "next
1488      alternative in the innermost enclosing group".      alternative in the innermost enclosing group".
1489    
1490    2.  (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
1491        such as   (A(*COMMIT)B(*THEN)C|D)  any failure after matching A should
1492        result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
1493        (*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
1494        (*THEN).
1495    
1496    3.  If \s appeared in a character class, it removed the VT character from
1497        the class, even if it had been included by some previous item, for example
1498        in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
1499        of \s, but is part of the POSIX "space" class.)
1500    
1501    4.  A partial match never returns an empty string (because you can always
1502        match an empty string at the end of the subject); however the checking for
1503        an empty string was starting at the "start of match" point. This has been
1504        changed to the "earliest inspected character" point, because the returned
1505        data for a partial match starts at this character. This means that, for
1506        example, /(?<=abc)def/ gives a partial match for the subject "abc"
1507        (previously it gave "no match").
1508    
1509    5.  Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
1510        of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
1511        previously a full match would be given. However, setting PCRE_PARTIAL_HARD
1512        has an implication that the given string is incomplete (because a partial
1513        match is preferred over a full match). For this reason, these items now
1514        give a partial match in this situation. [Aside: previously, the one case
1515        /t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
1516        match rather than a full match, which was wrong by the old rules, but is
1517        now correct.]
1518    
1519    6.  There was a bug in the handling of #-introduced comments, recognized when
1520        PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
1521        If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
1522        UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
1523        scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
1524        but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
1525        places in pcre_compile().
1526    
1527    7.  Related to (6) above, when pcre_compile() was skipping #-introduced
1528        comments when looking ahead for named forward references to subpatterns,
1529        the only newline sequence it recognized was NL. It now handles newlines
1530        according to the set newline convention.
1531    
1532    8.  SunOS4 doesn't have strerror() or strtoul(); pcregrep dealt with the
1533        former, but used strtoul(), whereas pcretest avoided strtoul() but did not
1534        cater for a lack of strerror(). These oversights have been fixed.
1535    
1536    9.  Added --match-limit and --recursion-limit to pcregrep.
1537    
1538    10. Added two casts needed to build with Visual Studio when NO_RECURSE is set.
1539    
1540    11. When the -o option was used, pcregrep was setting a return code of 1, even
1541        when matches were found, and --line-buffered was not being honoured.
1542    
1543    12. Added an optional parentheses number to the -o and --only-matching options
1544        of pcregrep.
1545    
1546    13. Imitating Perl's /g action for multiple matches is tricky when the pattern
1547        can match an empty string. The code to do it in pcretest and pcredemo
1548        needed fixing:
1549    
1550        (a) When the newline convention was "crlf", pcretest got it wrong, skipping
1551            only one byte after an empty string match just before CRLF (this case
1552            just got forgotten; "any" and "anycrlf" were OK).
1553    
1554        (b) The pcretest code also had a bug, causing it to loop forever in UTF-8
1555            mode when an empty string match preceded an ASCII character followed by
1556            a non-ASCII character. (The code for advancing by one character rather
1557            than one byte was nonsense.)
1558    
1559        (c) The pcredemo.c sample program did not have any code at all to handle
1560            the cases when CRLF is a valid newline sequence.
1561    
1562    14. Neither pcre_exec() nor pcre_dfa_exec() was checking that the value given
1563        as a starting offset was within the subject string. There is now a new
1564        error, PCRE_ERROR_BADOFFSET, which is returned if the starting offset is
1565        negative or greater than the length of the string. In order to test this,
1566        pcretest is extended to allow the setting of negative starting offsets.
1567    
1568    15. In both pcre_exec() and pcre_dfa_exec() the code for checking that the
1569        starting offset points to the beginning of a UTF-8 character was
1570        unnecessarily clumsy. I tidied it up.
1571    
1572    16. Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
1573        bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
1574    
1575    17. Nobody had reported that the --include_dir option, which was added in
1576        release 7.7 should have been called --include-dir (hyphen, not underscore)
1577        for compatibility with GNU grep. I have changed it to --include-dir, but
1578        left --include_dir as an undocumented synonym, and the same for
1579        --exclude-dir, though that is not available in GNU grep, at least as of
1580        release 2.5.4.
1581    
1582    18. At a user's suggestion, the macros GETCHAR and friends (which pick up UTF-8
1583        characters from a string of bytes) have been redefined so as not to use
1584        loops, in order to improve performance in some environments. At the same
1585        time, I abstracted some of the common code into auxiliary macros to save
1586        repetition (this should not affect the compiled code).
1587    
1588    19. If \c was followed by a multibyte UTF-8 character, bad things happened. A
1589        compile-time error is now given if \c is not followed by an ASCII
1590        character, that is, a byte less than 128. (In EBCDIC mode, the code is
1591        different, and any byte value is allowed.)
1592    
1593    20. Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
1594        START_OPTIMIZE option, which is now allowed at compile time - but just
1595        passed through to pcre_exec() or pcre_dfa_exec(). This makes it available
1596        to pcregrep and other applications that have no direct access to PCRE
1597        options. The new /Y option in pcretest sets this option when calling
1598        pcre_compile().
1599    
1600    21. Change 18 of release 8.01 broke the use of named subpatterns for recursive
1601        back references. Groups containing recursive back references were forced to
1602        be atomic by that change, but in the case of named groups, the amount of
1603        memory required was incorrectly computed, leading to "Failed: internal
1604        error: code overflow". This has been fixed.
1605    
1606    22. Some patches to pcre_stringpiece.h, pcre_stringpiece_unittest.cc, and
1607        pcretest.c, to avoid build problems in some Borland environments.
1608    
1609    
1610  Version 8.10 25-Jun-2010  Version 8.10 25-Jun-2010
1611  ------------------------  ------------------------
# Line 498  Version 7.9 11-Apr-09 Line 2093  Version 7.9 11-Apr-09
2093  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
2094      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
2095      locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this      locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
2096      seems to be how GNU grep behaves.      seems to be how GNU grep behaves. [But see later change 40 for release
2097        8.33.]
2098    
2099  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
2100      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 741  Version 7.7 07-May-08 Line 2337  Version 7.7 07-May-08
2337      containing () gave an internal compiling error instead of "reference to      containing () gave an internal compiling error instead of "reference to
2338      non-existent subpattern". Fortunately, when the pattern did exist, the      non-existent subpattern". Fortunately, when the pattern did exist, the
2339      compiled code was correct. (When scanning forwards to check for the      compiled code was correct. (When scanning forwards to check for the
2340      existencd of the subpattern, it was treating the data ']' as terminating      existence of the subpattern, it was treating the data ']' as terminating
2341      the class, so got the count wrong. When actually compiling, the reference      the class, so got the count wrong. When actually compiling, the reference
2342      was subsequently set up correctly.)      was subsequently set up correctly.)
2343    

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