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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.02 01-Mar-2010  Version 8.33 xx-xxxx-201x
5    -------------------------
6    
7    1.  Added 'U' to some constants that are compared to unsigned integers, to
8        avoid compiler signed/unsigned warnings. Added (int) casts to unsigned
9        variables that are added to signed variables, to ensure the result is
10        signed and can be negated.
11    
12    2.  Applied patch by Daniel Richard G for quashing MSVC warnings to the
13        CMake config files.
14    
15    3.  Revise the creation of config.h.generic so that all boolean macros are
16        #undefined, whereas non-boolean macros are #ifndef/#endif-ed. This makes
17        overriding via -D on the command line possible.
18    
19    4.  Changing the definition of the variable "op" in pcre_exec.c from pcre_uchar
20        to unsigned int is reported to make a quite noticeable speed difference in
21        a specific Windows environment. Testing on Linux did also appear to show
22        some benefit (and it is clearly not harmful). Also fixed the definition of
23        Xop which should be unsigned.
24    
25    5.  Related to (4), changing the definition of the intermediate variable cc
26        in repeated character loops from pcre_uchar to pcre_uint32 also gave speed
27        improvements.
28    
29    6.  Fix forward search in JIT when link size is 3 or greater. Also removed some
30        unnecessary spaces.
31    
32    7.  Adjust autogen.sh and configure.ac to lose warnings given by automake 1.12
33        and later.
34    
35    8.  Fix two buffer over read issues in 16 and 32 bit modes. Affects JIT only.
36    
37    9.  Optimizing fast_forward_start_bits in JIT.
38    
39    10. Adding experimental support for callouts in JIT, and fixing some
40        issues revealed during this work. Namely:
41    
42        (a) Unoptimized capturing brackets incorrectly reset on backtrack.
43    
44        (b) Minimum length was not checked before the matching is started.
45    
46    11. The value of capture_last that is passed to callouts was incorrect in some
47        cases when there was a capture on one path that was subsequently abandoned
48        after a backtrack. Also, the capture_last value is now reset after a
49        recursion, since all captures are also reset in this case.
50    
51    12. The interpreter no longer returns the "too many substrings" error in the
52        case when an overflowing capture is in a branch that is subsequently
53        abandoned after a backtrack.
54    
55    13. In the pathological case when an offset vector of size 2 is used, pcretest
56        now prints out the matched string after a yield of 0 or 1.
57    
58    14. Inlining subpatterns in recursions, when certain conditions are fulfilled.
59        Only supported by the JIT compiler at the moment.
60    
61    15. JIT compiler now supports 32 bit Macs thanks to Lawrence Velazquez.
62    
63    16. Partial matches now set offsets[2] to the "bumpalong" value, that is, the
64        offset of the starting point of the matching process, provided the offsets
65        vector is large enough.
66    
67    17. The \A escape now records a lookbehind value of 1, though its execution
68        does not actually inspect the previous character. This is to ensure that,
69        in partial multi-segment matching, at least one character from the old
70        segment is retained when a new segment is processed. Otherwise, if there
71        are no lookbehinds in the pattern, \A might match incorrectly at the start
72        of a new segment.
73    
74    18. Added some #ifdef __VMS code into pcretest.c to help VMS implementations.
75    
76    19. Redefined some pcre_uchar variables in pcre_exec.c as pcre_uint32; this
77        gives some modest performance improvement in 8-bit mode.
78    
79    20. Added the PCRE-specific property \p{Xuc} for matching characters that can
80        be expressed in certain programming languages using Universal Character
81        Names.
82    
83    21. Unicode validation has been updated in the light of Unicode Corrigendum #9,
84        which points out that "non characters" are not "characters that may not
85        appear in Unicode strings" but rather "characters that are reserved for
86        internal use and have only local meaning".
87    
88    22. When a pattern was compiled with automatic callouts (PCRE_AUTO_CALLOUT) and
89        there was a conditional group that depended on an assertion, if the
90        assertion was false, the callout that immediately followed the alternation
91        in the condition was skipped when pcre_exec() was used for matching.
92    
93    23. Allow an explicit callout to be inserted before an assertion that is the
94        condition for a conditional group, for compatibility with automatic
95        callouts, which always insert a callout at this point.
96    
97    24. In 8.31, (*COMMIT) was confined to within a recursive subpattern. Perl also
98        confines (*SKIP) and (*PRUNE) in the same way, and this has now been done.
99    
100    25. (*PRUNE) is now supported by the JIT compiler.
101    
102    26. Fix infinite loop when /(?<=(*SKIP)ac)a/ is matched against aa.
103    
104    27. Fix the case where there are two or more SKIPs with arguments that may be
105        ignored.
106    
107    28. Experimental support of (*SKIP) backtracking verb in the JIT compiler.
108    
109    29. Experimental support of (*THEN) backtracking verb in the JIT compiler.
110    
111    
112    Version 8.32 30-November-2012
113    -----------------------------
114    
115    1.  Improved JIT compiler optimizations for first character search and single
116        character iterators.
117    
118    2.  Supporting IBM XL C compilers for PPC architectures in the JIT compiler.
119        Patch by Daniel Richard G.
120    
121    3.  Single character iterator optimizations in the JIT compiler.
122    
123    4.  Improved JIT compiler optimizations for character ranges.
124    
125    5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
126        Reported by Giuseppe D'Angelo.
127    
128    6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
129        of a line, was being set incorrectly in cases where .* appeared inside
130        atomic brackets at the start of a pattern, or where there was a subsequent
131        *PRUNE or *SKIP.
132    
133    7.  Improved instruction cache flush for POWER/PowerPC.
134        Patch by Daniel Richard G.
135    
136    8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
137        grep:
138    
139        (a) There is now no limit to the number of patterns to be matched.
140    
141        (b) An error is given if a pattern is too long.
142    
143        (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
144            are now supported.
145    
146        (d) --exclude-from and --include-from (multiple use) have been added.
147    
148        (e) Exclusions and inclusions now apply to all files and directories, not
149            just to those obtained from scanning a directory recursively.
150    
151        (f) Multiple uses of -f and --file-list are now supported.
152    
153        (g) In a Windows environment, the default for -d has been changed from
154            "read" (the GNU grep default) to "skip", because otherwise the presence
155            of a directory in the file list provokes an error.
156    
157        (h) The documentation has been revised and clarified in places.
158    
159    9.  Improve the matching speed of capturing brackets.
160    
161    10. Changed the meaning of \X so that it now matches a Unicode extended
162        grapheme cluster.
163    
164    11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
165        out POSIX threads when JIT support is configured.
166    
167    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
168    
169    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
170        structure could go wrong in environments where size_t is not the same size
171        as int.
172    
173    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
174        set.
175    
176    15. The EBCDIC support had decayed; later updates to the code had included
177        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
178        general tidy up of EBCDIC-related issues, and the documentation was also
179        not quite right. There is now a test that can be run on ASCII systems to
180        check some of the EBCDIC-related things (but is it not a full test).
181    
182    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
183        in a small tidy to the code.
184    
185    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
186    
187    18. If the --only-matching (-o) option in pcregrep is specified multiple
188        times, each one causes appropriate output. For example, -o1 -o2 outputs the
189        substrings matched by the 1st and 2nd capturing parentheses. A separating
190        string can be specified by --om-separator (default empty).
191    
192    19. Improving the first n character searches.
193    
194    20. Turn case lists for horizontal and vertical white space into macros so that
195        they are defined only once.
196    
197    21. This set of changes together give more compatible Unicode case-folding
198        behaviour for characters that have more than one other case when UCP
199        support is available.
200    
201        (a) The Unicode property table now has offsets into a new table of sets of
202            three or more characters that are case-equivalent. The MultiStage2.py
203            script that generates these tables (the pcre_ucd.c file) now scans
204            CaseFolding.txt instead of UnicodeData.txt for character case
205            information.
206    
207        (b) The code for adding characters or ranges of characters to a character
208            class has been abstracted into a generalized function that also handles
209            case-independence. In UTF-mode with UCP support, this uses the new data
210            to handle characters with more than one other case.
211    
212        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
213            whose other case is greater than 256 are now correctly matched
214            caselessly. Previously, the high codepoint matched the low one, but not
215            vice versa.
216    
217        (d) The processing of \h, \H, \v, and \ in character classes now makes use
218            of the new class addition function, using character lists defined as
219            macros alongside the case definitions of 20 above.
220    
221        (e) Caseless back references now work with characters that have more than
222            one other case.
223    
224        (f) General caseless matching of characters with more than one other case
225            is supported.
226    
227    22. Unicode character properties were updated from Unicode 6.2.0
228    
229    23. Improved CMake support under Windows. Patch by Daniel Richard G.
230    
231    24. Add support for 32-bit character strings, and UTF-32
232    
233    25. Major JIT compiler update (code refactoring and bugfixing).
234        Experimental Sparc 32 support is added.
235    
236    26. Applied a modified version of Daniel Richard G's patch to create
237        pcre.h.generic and config.h.generic by "make" instead of in the
238        PrepareRelease script.
239    
240    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
241        pcre_compile.c when checking for a zero character.
242    
243    28. Introducing a native interface for JIT. Through this interface, the compiled
244        machine code can be directly executed. The purpose of this interface is to
245        provide fast pattern matching, so several sanity checks are not performed.
246        However, feature tests are still performed. The new interface provides
247        1.4x speedup compared to the old one.
248    
249    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
250        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
251        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
252    
253    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
254        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
255        the "old" RFC 2279). Instead, it ended up passing a negative length to
256        pcre_exec().
257    
258    31. Add support for GCC's visibility feature to hide internal functions.
259    
260    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
261        "unknown -C option" after outputting 0 or 1.
262    
263    33. There is now support for generating a code coverage report for the test
264        suite in environments where gcc is the compiler and lcov is installed. This
265        is mainly for the benefit of the developers.
266    
267    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
268        unaddressable using valgrind annotations, allowing valgrind to detect
269        invalid memory accesses. This is mainly for the benefit of the developers.
270    
271    25. (*UTF) can now be used to start a pattern in any of the three libraries.
272    
273    26. Give configure error if --enable-cpp but no C++ compiler found.
274    
275    
276    Version 8.31 06-July-2012
277    -------------------------
278    
279    1.  Fixing a wrong JIT test case and some compiler warnings.
280    
281    2.  Removed a bashism from the RunTest script.
282    
283    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
284        to unsigned type, result still unsigned" that was given by an MS compiler
285        on encountering the code "-sizeof(xxx)".
286    
287    4.  Partial matching support is added to the JIT compiler.
288    
289    5.  Fixed several bugs concerned with partial matching of items that consist
290        of more than one character:
291    
292        (a) /^(..)\1/ did not partially match "aba" because checking references was
293            done on an "all or nothing" basis. This also applied to repeated
294            references.
295    
296        (b) \R did not give a hard partial match if \r was found at the end of the
297            subject.
298    
299        (c) \X did not give a hard partial match after matching one or more
300            characters at the end of the subject.
301    
302        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
303            a partial match for the string "\r".
304    
305        (e) When newline was set to CRLF, the metacharacter "." did not recognize
306            a partial match for a CR character at the end of the subject string.
307    
308    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
309        running pcretest, the text "(JIT)" added to the output whenever JIT is
310        actually used to run the match.
311    
312    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
313        or /S+[+] with a digit between 1 and 7.
314    
315    8.  OP_NOT now supports any UTF character not just single-byte ones.
316    
317    9.  (*MARK) control verb is now supported by the JIT compiler.
318    
319    10. The command "./RunTest list" lists the available tests without actually
320        running any of them. (Because I keep forgetting what they all are.)
321    
322    11. Add PCRE_INFO_MAXLOOKBEHIND.
323    
324    12. Applied a (slightly modified) user-supplied patch that improves performance
325        when the heap is used for recursion (compiled with --disable-stack-for-
326        recursion). Instead of malloc and free for each heap frame each time a
327        logical recursion happens, frames are retained on a chain and re-used where
328        possible. This sometimes gives as much as 30% improvement.
329    
330    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
331        call.
332    
333    14. As documented, (*COMMIT) is now confined to within a positive assertion.
334    
335    15. It is now possible to link pcretest with libedit as an alternative to
336        libreadline.
337    
338    16. (*COMMIT) control verb is now supported by the JIT compiler.
339    
340    17. The Unicode data tables have been updated to Unicode 6.1.0.
341    
342    18. Added --file-list option to pcregrep.
343    
344    19. Added binary file support to pcregrep, including the -a, --binary-files,
345        -I, and --text options.
346    
347    20. The madvise function is renamed for posix_madvise for QNX compatibility
348        reasons. Fixed by Giuseppe D'Angelo.
349    
350    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
351    
352    22. Changed the option for creating symbolic links for 16-bit man pages from
353        -s to -sf so that re-installing does not cause issues.
354    
355    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
356    
357    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
358        matches in certain environments (the workspace was not being correctly
359        retained). Also added to pcre_dfa_exec() a simple plausibility check on
360        some of the workspace data at the beginning of a restart.
361    
362    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
363        was not doing so when it should - probably a typo introduced by SVN 528
364        (change 8.10/14).
365    
366    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
367        \w+ when the character tables indicated that \x{c4} was a word character.
368        There were several related cases, all because the tests for doing a table
369        lookup were testing for characters less than 127 instead of 255.
370    
371    27. If a pattern contains capturing parentheses that are not used in a match,
372        their slots in the ovector are set to -1. For those that are higher than
373        any matched groups, this happens at the end of processing. In the case when
374        there were back references that the ovector was too small to contain
375        (causing temporary malloc'd memory to be used during matching), and the
376        highest capturing number was not used, memory off the end of the ovector
377        was incorrectly being set to -1. (It was using the size of the temporary
378        memory instead of the true size.)
379    
380    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
381        ovector size, it uses memory at the end of the block that it has got.
382    
383    29. Check for an overlong MARK name and give an error at compile time. The
384        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
385    
386    30. JIT compiler update.
387    
388    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
389        Rill for the patch.
390    
391    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
392    
393    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
394    
395    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
396        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
397        was enabled.
398    
399    35. Improve JIT code generation for greedy plus quantifier.
400    
401    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
402        1 to "aa" instead of to an empty string. The bug affected repeated groups
403        that could potentially match an empty string.
404    
405    37. Optimizing single character iterators in JIT.
406    
407    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
408        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
409        codepoints that are too big for the mode are faulted, and in a UTF mode,
410        disallowed codepoints are also faulted.
411    
412    39. If PCRE was compiled with UTF support, in three places in the DFA
413        matcher there was code that should only have been obeyed in UTF mode, but
414        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
415        processing when bytes with values greater than 127 were present. In 16-bit
416        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
417        both cases the values are those that cannot be the first data item in a UTF
418        character. The three items that might have provoked this were recursions,
419        possessively repeated groups, and atomic groups.
420    
421    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
422        and pcregrep, because some OS require shared objects to be explicitly
423        passed to ld, causing the link step to fail if they are not.
424    
425    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
426        mode, patterns that started with \h* or \R* might be incorrectly matched.
427    
428    
429    Version 8.30 04-February-2012
430    -----------------------------
431    
432    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
433        name is defined in ctype.h.
434    
435    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
436        only in quite long subpatterns.
437    
438    3.  Removed the function pcre_info(), which has been obsolete and deprecated
439        since it was replaced by pcre_fullinfo() in February 2000.
440    
441    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
442        match a (*MARK), and the match failed at the start of the subject, a
443        reference to memory before the start of the subject could occur. This bug
444        was introduced by fix 17 of release 8.21.
445    
446    5.  A reference to an unset group with zero minimum repetition was giving
447        totally wrong answers (in non-JavaScript-compatibility mode). For example,
448        /(another)?(\1?)test/ matched against "hello world test". This bug was
449        introduced in release 8.13.
450    
451    6.  Add support for 16-bit character strings (a large amount of work involving
452        many changes and refactorings).
453    
454    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
455        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
456        from a file.
457    
458    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
459        rounding is not applied in this particular case).
460    
461    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
462        if they appear, or are escaped, in patterns.
463    
464    10. Get rid of a number of -Wunused-but-set-variable warnings.
465    
466    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
467        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
468        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
469        also returns the mark "x". This bug applied to capturing parentheses,
470        non-capturing parentheses, and atomic parentheses. It also applied to some
471        assertions.
472    
473    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
474        information out of configure.ac instead of relying on pcre.h.generic, which
475        is not stored in the repository.
476    
477    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
478        -lreadline.
479    
480    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
481    
482    15. Applied Graycode's patch to put the top-level frame on the stack rather
483        than the heap when not using the stack for recursion. This gives a
484        performance improvement in many cases when recursion is not deep.
485    
486    16. Experimental code added to "pcretest -C" to output the stack frame size.
487    
488    
489    Version 8.21 12-Dec-2011
490    ------------------------
491    
492    1.  Updating the JIT compiler.
493    
494    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
495        are added as well.
496    
497    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
498        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
499        calling _pcre_jit_exec. Some extra comments are added.
500    
501    4.  (*MARK) settings inside atomic groups that do not contain any capturing
502        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
503        was introduced by change 18 for 8.20.
504    
505    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
506        ECMA-262 standard.
507    
508    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
509        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
510        This bug was probably introduced by change 9 of 8.13.
511    
512    7.  While fixing 6 above, I noticed that a number of other items were being
513        incorrectly rejected as "not fixed length". This arose partly because newer
514        opcodes had not been added to the fixed-length checking code. I have (a)
515        corrected the bug and added tests for these items, and (b) arranged for an
516        error to occur if an unknown opcode is encountered while checking for fixed
517        length instead of just assuming "not fixed length". The items that were
518        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
519        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
520        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
521    
522    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
523        being incorrectly compiled and would have given unpredicatble results.
524    
525    9.  A possessively repeated subpattern with minimum repeat count greater than
526        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
527        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
528        the first (A) could occur when it should not.
529    
530    10. Add a cast and remove a redundant test from the code.
531    
532    11. JIT should use pcre_malloc/pcre_free for allocation.
533    
534    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
535        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
536        is anything other than /usr, -L is still shown).
537    
538    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
539    
540    14. Perl does not support \N without a following name in a [] class; PCRE now
541        also gives an error.
542    
543    15. If a forward reference was repeated with an upper limit of around 2000,
544        it caused the error "internal error: overran compiling workspace". The
545        maximum number of forward references (including repeats) was limited by the
546        internal workspace, and dependent on the LINK_SIZE. The code has been
547        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
548        the default depends on LINK_SIZE. There is a new upper limit (for safety)
549        of around 200,000 forward references. While doing this, I also speeded up
550        the filling in of repeated forward references.
551    
552    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
553        incorrectly expecting the subject to contain another "a" after the start.
554    
555    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
556        in the match, the SKIP should be ignored. This was not happening; instead
557        the SKIP was being treated as NOMATCH. For patterns such as
558        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
559        tested.
560    
561    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
562        now much more compatible with Perl, in particular in cases where the result
563        is a non-match for a non-anchored pattern. For example, if
564        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
565        "m", where previously it did not return a name. A side effect of this
566        change is that for partial matches, the last encountered mark name is
567        returned, as for non matches. A number of tests that were previously not
568        Perl-compatible have been moved into the Perl-compatible test files. The
569        refactoring has had the pleasing side effect of removing one argument from
570        the match() function, thus reducing its stack requirements.
571    
572    19. If the /S+ option was used in pcretest to study a pattern using JIT,
573        subsequent uses of /S (without +) incorrectly behaved like /S+.
574    
575    21. Retrieve executable code size support for the JIT compiler and fixing
576        some warnings.
577    
578    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
579        not work when the shorter character appeared right at the end of the
580        subject string.
581    
582    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
583        systems.
584    
585    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
586        output it when the /M option is used in pcretest.
587    
588    25. The CheckMan script was not being included in the distribution. Also, added
589        an explicit "perl" to run Perl scripts from the PrepareRelease script
590        because this is reportedly needed in Windows.
591    
592    26. If study data was being save in a file and studying had not found a set of
593        "starts with" bytes for the pattern, the data written to the file (though
594        never used) was taken from uninitialized memory and so caused valgrind to
595        complain.
596    
597    27. Updated RunTest.bat as provided by Sheri Pierce.
598    
599    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
600    
601    29. Computation of memory usage for the table of capturing group names was
602        giving an unnecessarily large value.
603    
604    
605    Version 8.20 21-Oct-2011
606    ------------------------
607    
608    1.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had
609        a POSIX class. After further experiments with Perl, which convinced me that
610        Perl has bugs and confusions, a closing square bracket is no longer allowed
611        in a POSIX name. This bug also affected patterns with classes that started
612        with full stops.
613    
614    2.  If a pattern such as /(a)b|ac/ is matched against "ac", there is no
615        captured substring, but while checking the failing first alternative,
616        substring 1 is temporarily captured. If the output vector supplied to
617        pcre_exec() was not big enough for this capture, the yield of the function
618        was still zero ("insufficient space for captured substrings"). This cannot
619        be totally fixed without adding another stack variable, which seems a lot
620        of expense for a edge case. However, I have improved the situation in cases
621        such as /(a)(b)x|abc/ matched against "abc", where the return code
622        indicates that fewer than the maximum number of slots in the ovector have
623        been set.
624    
625    3.  Related to (2) above: when there are more back references in a pattern than
626        slots in the output vector, pcre_exec() uses temporary memory during
627        matching, and copies in the captures as far as possible afterwards. It was
628        using the entire output vector, but this conflicts with the specification
629        that only 2/3 is used for passing back captured substrings. Now it uses
630        only the first 2/3, for compatibility. This is, of course, another edge
631        case.
632    
633    4.  Zoltan Herczeg's just-in-time compiler support has been integrated into the
634        main code base, and can be used by building with --enable-jit. When this is
635        done, pcregrep automatically uses it unless --disable-pcregrep-jit or the
636        runtime --no-jit option is given.
637    
638    5.  When the number of matches in a pcre_dfa_exec() run exactly filled the
639        ovector, the return from the function was zero, implying that there were
640        other matches that did not fit. The correct "exactly full" value is now
641        returned.
642    
643    6.  If a subpattern that was called recursively or as a subroutine contained
644        (*PRUNE) or any other control that caused it to give a non-standard return,
645        invalid errors such as "Error -26 (nested recursion at the same subject
646        position)" or even infinite loops could occur.
647    
648    7.  If a pattern such as /a(*SKIP)c|b(*ACCEPT)|/ was studied, it stopped
649        computing the minimum length on reaching *ACCEPT, and so ended up with the
650        wrong value of 1 rather than 0. Further investigation indicates that
651        computing a minimum subject length in the presence of *ACCEPT is difficult
652        (think back references, subroutine calls), and so I have changed the code
653        so that no minimum is registered for a pattern that contains *ACCEPT.
654    
655    8.  If (*THEN) was present in the first (true) branch of a conditional group,
656        it was not handled as intended. [But see 16 below.]
657    
658    9.  Replaced RunTest.bat and CMakeLists.txt with improved versions provided by
659        Sheri Pierce.
660    
661    10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that
662        the first byte in a match must be "a".
663    
664    11. Change 17 for 8.13 increased the recursion depth for patterns like
665        /a(?:.)*?a/ drastically. I've improved things by remembering whether a
666        pattern contains any instances of (*THEN). If it does not, the old
667        optimizations are restored. It would be nice to do this on a per-group
668        basis, but at the moment that is not feasible.
669    
670    12. In some environments, the output of pcretest -C is CRLF terminated. This
671        broke RunTest's code that checks for the link size. A single white space
672        character after the value is now allowed for.
673    
674    13. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".
675        For "fr", it uses the Windows-specific input and output files.
676    
677    14. If (*THEN) appeared in a group that was called recursively or as a
678        subroutine, it did not work as intended. [But see next item.]
679    
680    15. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex
681        pattern fragments (but not containing any | characters). If A and B are
682        matched, but there is a failure in C so that it backtracks to (*THEN), PCRE
683        was behaving differently to Perl. PCRE backtracked into A, but Perl goes to
684        D. In other words, Perl considers parentheses that do not contain any |
685        characters to be part of a surrounding alternative, whereas PCRE was
686        treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles
687        differently. PCRE now behaves in the same way as Perl, except in the case
688        of subroutine/recursion calls such as (?1) which have in any case always
689        been different (but PCRE had them first :-).
690    
691    16. Related to 15 above: Perl does not treat the | in a conditional group as
692        creating alternatives. Such a group is treated in the same way as an
693        ordinary group without any | characters when processing (*THEN). PCRE has
694        been changed to match Perl's behaviour.
695    
696    17. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the
697        RunGrepTest script failed.
698    
699    18. Change 22 for version 13 caused atomic groups to use more stack. This is
700        inevitable for groups that contain captures, but it can lead to a lot of
701        stack use in large patterns. The old behaviour has been restored for atomic
702        groups that do not contain any capturing parentheses.
703    
704    19. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not
705        suppress the check for a minimum subject length at run time. (If it was
706        given to pcre_exec() or pcre_dfa_exec() it did work.)
707    
708    20. Fixed an ASCII-dependent infelicity in pcretest that would have made it
709        fail to work when decoding hex characters in data strings in EBCDIC
710        environments.
711    
712    21. It appears that in at least one Mac OS environment, the isxdigit() function
713        is implemented as a macro that evaluates to its argument more than once,
714        contravening the C 90 Standard (I haven't checked a later standard). There
715        was an instance in pcretest which caused it to go wrong when processing
716        \x{...} escapes in subject strings. The has been rewritten to avoid using
717        things like p++ in the argument of isxdigit().
718    
719    
720    Version 8.13 16-Aug-2011
721    ------------------------
722    
723    1.  The Unicode data tables have been updated to Unicode 6.0.0.
724    
725    2.  Two minor typos in pcre_internal.h have been fixed.
726    
727    3.  Added #include <string.h> to pcre_scanner_unittest.cc, pcrecpp.cc, and
728        pcrecpp_unittest.cc. They are needed for strcmp(), memset(), and strchr()
729        in some environments (e.g. Solaris 10/SPARC using Sun Studio 12U2).
730    
731    4.  There were a number of related bugs in the code for matching backrefences
732        caselessly in UTF-8 mode when codes for the characters concerned were
733        different numbers of bytes. For example, U+023A and U+2C65 are an upper
734        and lower case pair, using 2 and 3 bytes, respectively. The main bugs were:
735        (a) A reference to 3 copies of a 2-byte code matched only 2 of a 3-byte
736        code. (b) A reference to 2 copies of a 3-byte code would not match 2 of a
737        2-byte code at the end of the subject (it thought there wasn't enough data
738        left).
739    
740    5.  Comprehensive information about what went wrong is now returned by
741        pcre_exec() and pcre_dfa_exec() when the UTF-8 string check fails, as long
742        as the output vector has at least 2 elements. The offset of the start of
743        the failing character and a reason code are placed in the vector.
744    
745    6.  When the UTF-8 string check fails for pcre_compile(), the offset that is
746        now returned is for the first byte of the failing character, instead of the
747        last byte inspected. This is an incompatible change, but I hope it is small
748        enough not to be a problem. It makes the returned offset consistent with
749        pcre_exec() and pcre_dfa_exec().
750    
751    7.  pcretest now gives a text phrase as well as the error number when
752        pcre_exec() or pcre_dfa_exec() fails; if the error is a UTF-8 check
753        failure, the offset and reason code are output.
754    
755    8.  When \R was used with a maximizing quantifier it failed to skip backwards
756        over a \r\n pair if the subsequent match failed. Instead, it just skipped
757        back over a single character (\n). This seems wrong (because it treated the
758        two characters as a single entity when going forwards), conflicts with the
759        documentation that \R is equivalent to (?>\r\n|\n|...etc), and makes the
760        behaviour of \R* different to (\R)*, which also seems wrong. The behaviour
761        has been changed.
762    
763    9.  Some internal refactoring has changed the processing so that the handling
764        of the PCRE_CASELESS and PCRE_MULTILINE options is done entirely at compile
765        time (the PCRE_DOTALL option was changed this way some time ago: version
766        7.7 change 16). This has made it possible to abolish the OP_OPT op code,
767        which was always a bit of a fudge. It also means that there is one less
768        argument for the match() function, which reduces its stack requirements
769        slightly. This change also fixes an incompatibility with Perl: the pattern
770        (?i:([^b]))(?1) should not match "ab", but previously PCRE gave a match.
771    
772    10. More internal refactoring has drastically reduced the number of recursive
773        calls to match() for possessively repeated groups such as (abc)++ when
774        using pcre_exec().
775    
776    11. While implementing 10, a number of bugs in the handling of groups were
777        discovered and fixed:
778    
779        (?<=(a)+) was not diagnosed as invalid (non-fixed-length lookbehind).
780        (a|)*(?1) gave a compile-time internal error.
781        ((a|)+)+  did not notice that the outer group could match an empty string.
782        (^a|^)+   was not marked as anchored.
783        (.*a|.*)+ was not marked as matching at start or after a newline.
784    
785    12. Yet more internal refactoring has removed another argument from the match()
786        function. Special calls to this function are now indicated by setting a
787        value in a variable in the "match data" data block.
788    
789    13. Be more explicit in pcre_study() instead of relying on "default" for
790        opcodes that mean there is no starting character; this means that when new
791        ones are added and accidentally left out of pcre_study(), testing should
792        pick them up.
793    
794    14. The -s option of pcretest has been documented for ages as being an old
795        synonym of -m (show memory usage). I have changed it to mean "force study
796        for every regex", that is, assume /S for every regex. This is similar to -i
797        and -d etc. It's slightly incompatible, but I'm hoping nobody is still
798        using it. It makes it easier to run collections of tests with and without
799        study enabled, and thereby test pcre_study() more easily. All the standard
800        tests are now run with and without -s (but some patterns can be marked as
801        "never study" - see 20 below).
802    
803    15. When (*ACCEPT) was used in a subpattern that was called recursively, the
804        restoration of the capturing data to the outer values was not happening
805        correctly.
806    
807    16. If a recursively called subpattern ended with (*ACCEPT) and matched an
808        empty string, and PCRE_NOTEMPTY was set, pcre_exec() thought the whole
809        pattern had matched an empty string, and so incorrectly returned a no
810        match.
811    
812    17. There was optimizing code for the last branch of non-capturing parentheses,
813        and also for the obeyed branch of a conditional subexpression, which used
814        tail recursion to cut down on stack usage. Unfortunately, now that there is
815        the possibility of (*THEN) occurring in these branches, tail recursion is
816        no longer possible because the return has to be checked for (*THEN). These
817        two optimizations have therefore been removed. [But see 8.20/11 above.]
818    
819    18. If a pattern containing \R was studied, it was assumed that \R always
820        matched two bytes, thus causing the minimum subject length to be
821        incorrectly computed because \R can also match just one byte.
822    
823    19. If a pattern containing (*ACCEPT) was studied, the minimum subject length
824        was incorrectly computed.
825    
826    20. If /S is present twice on a test pattern in pcretest input, it now
827        *disables* studying, thereby overriding the use of -s on the command line
828        (see 14 above). This is necessary for one or two tests to keep the output
829        identical in both cases.
830    
831    21. When (*ACCEPT) was used in an assertion that matched an empty string and
832        PCRE_NOTEMPTY was set, PCRE applied the non-empty test to the assertion.
833    
834    22. When an atomic group that contained a capturing parenthesis was
835        successfully matched, but the branch in which it appeared failed, the
836        capturing was not being forgotten if a higher numbered group was later
837        captured. For example, /(?>(a))b|(a)c/ when matching "ac" set capturing
838        group 1 to "a", when in fact it should be unset. This applied to multi-
839        branched capturing and non-capturing groups, repeated or not, and also to
840        positive assertions (capturing in negative assertions does not happen
841        in PCRE) and also to nested atomic groups.
842    
843    23. Add the ++ qualifier feature to pcretest, to show the remainder of the
844        subject after a captured substring, to make it easier to tell which of a
845        number of identical substrings has been captured.
846    
847    24. The way atomic groups are processed by pcre_exec() has been changed so that
848        if they are repeated, backtracking one repetition now resets captured
849        values correctly. For example, if ((?>(a+)b)+aabab) is matched against
850        "aaaabaaabaabab" the value of captured group 2 is now correctly recorded as
851        "aaa". Previously, it would have been "a". As part of this code
852        refactoring, the way recursive calls are handled has also been changed.
853    
854    25. If an assertion condition captured any substrings, they were not passed
855        back unless some other capturing happened later. For example, if
856        (?(?=(a))a) was matched against "a", no capturing was returned.
857    
858    26. When studying a pattern that contained subroutine calls or assertions,
859        the code for finding the minimum length of a possible match was handling
860        direct recursions such as (xxx(?1)|yyy) but not mutual recursions (where
861        group 1 called group 2 while simultaneously a separate group 2 called group
862        1). A stack overflow occurred in this case. I have fixed this by limiting
863        the recursion depth to 10.
864    
865    27. Updated RunTest.bat in the distribution to the version supplied by Tom
866        Fortmann. This supports explicit test numbers on the command line, and has
867        argument validation and error reporting.
868    
869    28. An instance of \X with an unlimited repeat could fail if at any point the
870        first character it looked at was a mark character.
871    
872    29. Some minor code refactoring concerning Unicode properties and scripts
873        should reduce the stack requirement of match() slightly.
874    
875    30. Added the '=' option to pcretest to check the setting of unused capturing
876        slots at the end of the pattern, which are documented as being -1, but are
877        not included in the return count.
878    
879    31. If \k was not followed by a braced, angle-bracketed, or quoted name, PCRE
880        compiled something random. Now it gives a compile-time error (as does
881        Perl).
882    
883    32. A *MARK encountered during the processing of a positive assertion is now
884        recorded and passed back (compatible with Perl).
885    
886    33. If --only-matching or --colour was set on a pcregrep call whose pattern
887        had alternative anchored branches, the search for a second match in a line
888        was done as if at the line start. Thus, for example, /^01|^02/ incorrectly
889        matched the line "0102" twice. The same bug affected patterns that started
890        with a backwards assertion. For example /\b01|\b02/ also matched "0102"
891        twice.
892    
893    34. Previously, PCRE did not allow quantification of assertions. However, Perl
894        does, and because of capturing effects, quantifying parenthesized
895        assertions may at times be useful. Quantifiers are now allowed for
896        parenthesized assertions.
897    
898    35. A minor code tidy in pcre_compile() when checking options for \R usage.
899    
900    36. \g was being checked for fancy things in a character class, when it should
901        just be a literal "g".
902    
903    37. PCRE was rejecting [:a[:digit:]] whereas Perl was not. It seems that the
904        appearance of a nested POSIX class supersedes an apparent external class.
905        For example, [:a[:digit:]b:] matches "a", "b", ":", or a digit. Also,
906        unescaped square brackets may also appear as part of class names. For
907        example, [:a[:abc]b:] gives unknown class "[:abc]b:]". PCRE now behaves
908        more like Perl. (But see 8.20/1 above.)
909    
910    38. PCRE was giving an error for \N with a braced quantifier such as {1,} (this
911        was because it thought it was \N{name}, which is not supported).
912    
913    39. Add minix to OS list not supporting the -S option in pcretest.
914    
915    40. PCRE tries to detect cases of infinite recursion at compile time, but it
916        cannot analyze patterns in sufficient detail to catch mutual recursions
917        such as ((?1))((?2)). There is now a runtime test that gives an error if a
918        subgroup is called recursively as a subpattern for a second time at the
919        same position in the subject string. In previous releases this might have
920        been caught by the recursion limit, or it might have run out of stack.
921    
922    41. A pattern such as /(?(R)a+|(?R)b)/ is quite safe, as the recursion can
923        happen only once. PCRE was, however incorrectly giving a compile time error
924        "recursive call could loop indefinitely" because it cannot analyze the
925        pattern in sufficient detail. The compile time test no longer happens when
926        PCRE is compiling a conditional subpattern, but actual runaway loops are
927        now caught at runtime (see 40 above).
928    
929    42. It seems that Perl allows any characters other than a closing parenthesis
930        to be part of the NAME in (*MARK:NAME) and other backtracking verbs. PCRE
931        has been changed to be the same.
932    
933    43. Updated configure.ac to put in more quoting round AC_LANG_PROGRAM etc. so
934        as not to get warnings when autogen.sh is called. Also changed
935        AC_PROG_LIBTOOL (deprecated) to LT_INIT (the current macro).
936    
937    44. To help people who use pcregrep to scan files containing exceedingly long
938        lines, the following changes have been made:
939    
940        (a) The default value of the buffer size parameter has been increased from
941            8K to 20K. (The actual buffer used is three times this size.)
942    
943        (b) The default can be changed by ./configure --with-pcregrep-bufsize when
944            PCRE is built.
945    
946        (c) A --buffer-size=n option has been added to pcregrep, to allow the size
947            to be set at run time.
948    
949        (d) Numerical values in pcregrep options can be followed by K or M, for
950            example --buffer-size=50K.
951    
952        (e) If a line being scanned overflows pcregrep's buffer, an error is now
953            given and the return code is set to 2.
954    
955    45. Add a pointer to the latest mark to the callout data block.
956    
957    46. The pattern /.(*F)/, when applied to "abc" with PCRE_PARTIAL_HARD, gave a
958        partial match of an empty string instead of no match. This was specific to
959        the use of ".".
960    
961    47. The pattern /f.*/8s, when applied to "for" with PCRE_PARTIAL_HARD, gave a
962        complete match instead of a partial match. This bug was dependent on both
963        the PCRE_UTF8 and PCRE_DOTALL options being set.
964    
965    48. For a pattern such as /\babc|\bdef/ pcre_study() was failing to set up the
966        starting byte set, because \b was not being ignored.
967    
968    
969    Version 8.12 15-Jan-2011
970    ------------------------
971    
972    1.  Fixed some typos in the markup of the man pages, and wrote a script that
973        checks for such things as part of the documentation building process.
974    
975    2.  On a big-endian 64-bit system, pcregrep did not correctly process the
976        --match-limit and --recursion-limit options (added for 8.11). In
977        particular, this made one of the standard tests fail. (The integer value
978        went into the wrong half of a long int.)
979    
980    3.  If the --colour option was given to pcregrep with -v (invert match), it
981        did strange things, either producing crazy output, or crashing. It should,
982        of course, ignore a request for colour when reporting lines that do not
983        match.
984    
985    4.  Another pcregrep bug caused similar problems if --colour was specified with
986        -M (multiline) and the pattern match finished with a line ending.
987    
988    5.  In pcregrep, when a pattern that ended with a literal newline sequence was
989        matched in multiline mode, the following line was shown as part of the
990        match. This seems wrong, so I have changed it.
991    
992    6.  Another pcregrep bug in multiline mode, when --colour was specified, caused
993        the check for further matches in the same line (so they could be coloured)
994        to overrun the end of the current line. If another match was found, it was
995        incorrectly shown (and then shown again when found in the next line).
996    
997    7.  If pcregrep was compiled under Windows, there was a reference to the
998        function pcregrep_exit() before it was defined. I am assuming this was
999        the cause of the "error C2371: 'pcregrep_exit' : redefinition;" that was
1000        reported by a user. I've moved the definition above the reference.
1001    
1002    
1003    Version 8.11 10-Dec-2010
1004    ------------------------
1005    
1006    1.  (*THEN) was not working properly if there were untried alternatives prior
1007        to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
1008        backtracked to try for "b" instead of moving to the next alternative branch
1009        at the same level (in this case, to look for "c"). The Perl documentation
1010        is clear that when (*THEN) is backtracked onto, it goes to the "next
1011        alternative in the innermost enclosing group".
1012    
1013    2.  (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
1014        such as   (A(*COMMIT)B(*THEN)C|D)  any failure after matching A should
1015        result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
1016        (*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
1017        (*THEN).
1018    
1019    3.  If \s appeared in a character class, it removed the VT character from
1020        the class, even if it had been included by some previous item, for example
1021        in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
1022        of \s, but is part of the POSIX "space" class.)
1023    
1024    4.  A partial match never returns an empty string (because you can always
1025        match an empty string at the end of the subject); however the checking for
1026        an empty string was starting at the "start of match" point. This has been
1027        changed to the "earliest inspected character" point, because the returned
1028        data for a partial match starts at this character. This means that, for
1029        example, /(?<=abc)def/ gives a partial match for the subject "abc"
1030        (previously it gave "no match").
1031    
1032    5.  Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
1033        of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
1034        previously a full match would be given. However, setting PCRE_PARTIAL_HARD
1035        has an implication that the given string is incomplete (because a partial
1036        match is preferred over a full match). For this reason, these items now
1037        give a partial match in this situation. [Aside: previously, the one case
1038        /t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
1039        match rather than a full match, which was wrong by the old rules, but is
1040        now correct.]
1041    
1042    6.  There was a bug in the handling of #-introduced comments, recognized when
1043        PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
1044        If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
1045        UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
1046        scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
1047        but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
1048        places in pcre_compile().
1049    
1050    7.  Related to (6) above, when pcre_compile() was skipping #-introduced
1051        comments when looking ahead for named forward references to subpatterns,
1052        the only newline sequence it recognized was NL. It now handles newlines
1053        according to the set newline convention.
1054    
1055    8.  SunOS4 doesn't have strerror() or strtoul(); pcregrep dealt with the
1056        former, but used strtoul(), whereas pcretest avoided strtoul() but did not
1057        cater for a lack of strerror(). These oversights have been fixed.
1058    
1059    9.  Added --match-limit and --recursion-limit to pcregrep.
1060    
1061    10. Added two casts needed to build with Visual Studio when NO_RECURSE is set.
1062    
1063    11. When the -o option was used, pcregrep was setting a return code of 1, even
1064        when matches were found, and --line-buffered was not being honoured.
1065    
1066    12. Added an optional parentheses number to the -o and --only-matching options
1067        of pcregrep.
1068    
1069    13. Imitating Perl's /g action for multiple matches is tricky when the pattern
1070        can match an empty string. The code to do it in pcretest and pcredemo
1071        needed fixing:
1072    
1073        (a) When the newline convention was "crlf", pcretest got it wrong, skipping
1074            only one byte after an empty string match just before CRLF (this case
1075            just got forgotten; "any" and "anycrlf" were OK).
1076    
1077        (b) The pcretest code also had a bug, causing it to loop forever in UTF-8
1078            mode when an empty string match preceded an ASCII character followed by
1079            a non-ASCII character. (The code for advancing by one character rather
1080            than one byte was nonsense.)
1081    
1082        (c) The pcredemo.c sample program did not have any code at all to handle
1083            the cases when CRLF is a valid newline sequence.
1084    
1085    14. Neither pcre_exec() nor pcre_dfa_exec() was checking that the value given
1086        as a starting offset was within the subject string. There is now a new
1087        error, PCRE_ERROR_BADOFFSET, which is returned if the starting offset is
1088        negative or greater than the length of the string. In order to test this,
1089        pcretest is extended to allow the setting of negative starting offsets.
1090    
1091    15. In both pcre_exec() and pcre_dfa_exec() the code for checking that the
1092        starting offset points to the beginning of a UTF-8 character was
1093        unnecessarily clumsy. I tidied it up.
1094    
1095    16. Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
1096        bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
1097    
1098    17. Nobody had reported that the --include_dir option, which was added in
1099        release 7.7 should have been called --include-dir (hyphen, not underscore)
1100        for compatibility with GNU grep. I have changed it to --include-dir, but
1101        left --include_dir as an undocumented synonym, and the same for
1102        --exclude-dir, though that is not available in GNU grep, at least as of
1103        release 2.5.4.
1104    
1105    18. At a user's suggestion, the macros GETCHAR and friends (which pick up UTF-8
1106        characters from a string of bytes) have been redefined so as not to use
1107        loops, in order to improve performance in some environments. At the same
1108        time, I abstracted some of the common code into auxiliary macros to save
1109        repetition (this should not affect the compiled code).
1110    
1111    19. If \c was followed by a multibyte UTF-8 character, bad things happened. A
1112        compile-time error is now given if \c is not followed by an ASCII
1113        character, that is, a byte less than 128. (In EBCDIC mode, the code is
1114        different, and any byte value is allowed.)
1115    
1116    20. Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
1117        START_OPTIMIZE option, which is now allowed at compile time - but just
1118        passed through to pcre_exec() or pcre_dfa_exec(). This makes it available
1119        to pcregrep and other applications that have no direct access to PCRE
1120        options. The new /Y option in pcretest sets this option when calling
1121        pcre_compile().
1122    
1123    21. Change 18 of release 8.01 broke the use of named subpatterns for recursive
1124        back references. Groups containing recursive back references were forced to
1125        be atomic by that change, but in the case of named groups, the amount of
1126        memory required was incorrectly computed, leading to "Failed: internal
1127        error: code overflow". This has been fixed.
1128    
1129    22. Some patches to pcre_stringpiece.h, pcre_stringpiece_unittest.cc, and
1130        pcretest.c, to avoid build problems in some Borland environments.
1131    
1132    
1133    Version 8.10 25-Jun-2010
1134    ------------------------
1135    
1136    1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
1137        THEN.
1138    
1139    2.  (*ACCEPT) was not working when inside an atomic group.
1140    
1141    3.  Inside a character class, \B is treated as a literal by default, but
1142        faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
1143        causes the error). The code is unchanged, but I tidied the documentation.
1144    
1145    4.  Inside a character class, PCRE always treated \R and \X as literals,
1146        whereas Perl faults them if its -w option is set. I have changed PCRE so
1147        that it faults them when PCRE_EXTRA is set.
1148    
1149    5.  Added support for \N, which always matches any character other than
1150        newline. (It is the same as "." when PCRE_DOTALL is not set.)
1151    
1152    6.  When compiling pcregrep with newer versions of gcc which may have
1153        FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
1154        declared with attribute warn_unused_result" were given. Just casting the
1155        result to (void) does not stop the warnings; a more elaborate fudge is
1156        needed. I've used a macro to implement this.
1157    
1158    7.  Minor change to pcretest.c to avoid a compiler warning.
1159    
1160    8.  Added four artifical Unicode properties to help with an option to make
1161        \s etc use properties (see next item). The new properties are: Xan
1162        (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
1163    
1164    9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
1165        use Unicode properties. (*UCP) at the start of a pattern can be used to set
1166        this option. Modified pcretest to add /W to test this facility. Added
1167        REG_UCP to make it available via the POSIX interface.
1168    
1169    10. Added --line-buffered to pcregrep.
1170    
1171    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
1172        studied, and the match started with a letter with a code point greater than
1173        127 whose first byte was different to the first byte of the other case of
1174        the letter, the other case of this starting letter was not recognized
1175        (#976).
1176    
1177    12. If a pattern that was studied started with a repeated Unicode property
1178        test, for example, \p{Nd}+, there was the theoretical possibility of
1179        setting up an incorrect bitmap of starting bytes, but fortunately it could
1180        not have actually happened in practice until change 8 above was made (it
1181        added property types that matched character-matching opcodes).
1182    
1183    13. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
1184        possible starting bytes for non-anchored patterns.
1185    
1186    14. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes
1187        \R, and also a number of cases that involve Unicode properties, both
1188        explicit and implicit when PCRE_UCP is set.
1189    
1190    15. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
1191        input, it could crash or give wrong results if characters with values
1192        greater than 0xc0 were present in the subject string. (Detail: it assumed
1193        UTF-8 input when processing these items.)
1194    
1195    16. Added a lot of (int) casts to avoid compiler warnings in systems where
1196        size_t is 64-bit (#991).
1197    
1198    17. Added a check for running out of memory when PCRE is compiled with
1199        --disable-stack-for-recursion (#990).
1200    
1201    18. If the last data line in a file for pcretest does not have a newline on
1202        the end, a newline was missing in the output.
1203    
1204    19. The default pcre_chartables.c file recognizes only ASCII characters (values
1205        less than 128) in its various bitmaps. However, there is a facility for
1206        generating tables according to the current locale when PCRE is compiled. It
1207        turns out that in some environments, 0x85 and 0xa0, which are Unicode space
1208        characters, are recognized by isspace() and therefore were getting set in
1209        these tables, and indeed these tables seem to approximate to ISO 8859. This
1210        caused a problem in UTF-8 mode when pcre_study() was used to create a list
1211        of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
1212        which of course cannot start UTF-8 characters. I have changed the code so
1213        that only real ASCII characters (less than 128) and the correct starting
1214        bytes for UTF-8 encodings are set for characters greater than 127 when in
1215        UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
1216        altogether.)
1217    
1218    20. Added the /T option to pcretest so as to be able to run tests with non-
1219        standard character tables, thus making it possible to include the tests
1220        used for 19 above in the standard set of tests.
1221    
1222    21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
1223        reference to a subpattern the other side of a comment that contains an
1224        opening parenthesis caused either an internal compiling error, or a
1225        reference to the wrong subpattern.
1226    
1227    
1228    Version 8.02 19-Mar-2010
1229  ------------------------  ------------------------
1230    
1231  1.  The Unicode data tables have been updated to Unicode 5.2.0.  1.  The Unicode data tables have been updated to Unicode 5.2.0.
1232    
1233  2.  Added the option --libs-cpp to pcre-config, but only when C++ support is  2.  Added the option --libs-cpp to pcre-config, but only when C++ support is
1234      configured.      configured.
1235    
1236  3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the  3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the
1237      original author of that file, following a query about its status.      original author of that file, following a query about its status.
1238    
1239  4.  On systems that do not have stdint.h (e.g. Solaris), check for and include  4.  On systems that do not have stdint.h (e.g. Solaris), check for and include
1240      inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.      inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.
1241    
1242  5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive  5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
1243      quantifier applied to a forward-referencing subroutine call, could compile      quantifier applied to a forward-referencing subroutine call, could compile
1244      incorrect code or give the error "internal error: previously-checked      incorrect code or give the error "internal error: previously-checked
1245      referenced subpattern not found".      referenced subpattern not found".
1246    
1247  6.  Both MS Visual Studio and Symbian OS have problems with initializing  6.  Both MS Visual Studio and Symbian OS have problems with initializing
1248      variables to point to external functions. For these systems, therefore,      variables to point to external functions. For these systems, therefore,
1249      pcre_malloc etc. are now initialized to local functions that call the      pcre_malloc etc. are now initialized to local functions that call the
1250      relevant global functions.      relevant global functions.
1251    
1252  7.  There were two entries missing in the vectors called coptable and poptable  7.  There were two entries missing in the vectors called coptable and poptable
1253      in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.      in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.
1254      I've fixed the data, and added a kludgy way of testing at compile time that      I've fixed the data, and added a kludgy way of testing at compile time that
1255      the lengths are correct (equal to the number of opcodes).      the lengths are correct (equal to the number of opcodes).
1256    
1257    8.  Following on from 7, I added a similar kludge to check the length of the
1258        eint vector in pcreposix.c.
1259    
1260    9.  Error texts for pcre_compile() are held as one long string to avoid too
1261        much relocation at load time. To find a text, the string is searched,
1262        counting zeros. There was no check for running off the end of the string,
1263        which could happen if a new error number was added without updating the
1264        string.
1265    
1266    10. \K gave a compile-time error if it appeared in a lookbehind assersion.
1267    
1268    11. \K was not working if it appeared in an atomic group or in a group that
1269        was called as a "subroutine", or in an assertion. Perl 5.11 documents that
1270        \K is "not well defined" if used in an assertion. PCRE now accepts it if
1271        the assertion is positive, but not if it is negative.
1272    
1273    12. Change 11 fortuitously reduced the size of the stack frame used in the
1274        "match()" function of pcre_exec.c by one pointer. Forthcoming
1275        implementation of support for (*MARK) will need an extra pointer on the
1276        stack; I have reserved it now, so that the stack frame size does not
1277        decrease.
1278    
1279    13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other
1280        item in branch that calls a recursion is a subroutine call - as in the
1281        second branch in the above example - was incorrectly given the compile-
1282        time error "recursive call could loop indefinitely" because pcre_compile()
1283        was not correctly checking the subroutine for matching a non-empty string.
1284    
1285    14. The checks for overrunning compiling workspace could trigger after an
1286        overrun had occurred. This is a "should never occur" error, but it can be
1287        triggered by pathological patterns such as hundreds of nested parentheses.
1288        The checks now trigger 100 bytes before the end of the workspace.
1289    
1290    15. Fix typo in configure.ac: "srtoq" should be "strtoq".
1291    
1292    
1293  Version 8.01 19-Jan-2010  Version 8.01 19-Jan-2010

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