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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. (*SKIP) is now supported by the JIT compiler.
108    
109    29. (*THEN) is now supported by the JIT compiler.
110    
111    30. Update RunTest with additional test selector options.
112    
113    31. The way PCRE handles backtracking verbs has been changed in two ways.
114    
115        (1) Previously, in something like (*COMMIT)(*SKIP), COMMIT would override
116        SKIP. Now, PCRE acts on whichever backtracking verb is reached first by
117        backtracking. In some cases this makes it more Perl-compatible, but Perl's
118        rather obscure rules do not always do the same thing.
119    
120        (2) Previously, backtracking verbs were confined within assertions. This is
121        no longer the case for positive assertions, except for (*ACCEPT). Again,
122        this sometimes improves Perl compatibility, and sometimes does not.
123    
124    32. A number of tests that were in test 2 because Perl did things differently
125        have been moved to test 1, because either Perl or PCRE has changed, and
126        these tests are now compatible.
127    
128    32. Control verbs are handled in the same way in JIT and interpreter.
129    
130    33. An opening parenthesis in a MARK/PRUNE/SKIP/THEN name in a pattern that
131        contained a forward subroutine reference caused a compile error.
132    
133    34. Auto-detect and optimize limited repetitions in JIT.
134    
135    35. Implement PCRE_NEVER_UTF to lock out the use of UTF, in particular,
136        blocking (*UTF) etc.
137    
138    36. In the interpreter, maximizing pattern repetitions for characters and
139        character types now use tail recursion, which reduces stack usage.
140    
141    
142    Version 8.32 30-November-2012
143    -----------------------------
144    
145    1.  Improved JIT compiler optimizations for first character search and single
146        character iterators.
147    
148    2.  Supporting IBM XL C compilers for PPC architectures in the JIT compiler.
149        Patch by Daniel Richard G.
150    
151    3.  Single character iterator optimizations in the JIT compiler.
152    
153    4.  Improved JIT compiler optimizations for character ranges.
154    
155    5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
156        Reported by Giuseppe D'Angelo.
157    
158    6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
159        of a line, was being set incorrectly in cases where .* appeared inside
160        atomic brackets at the start of a pattern, or where there was a subsequent
161        *PRUNE or *SKIP.
162    
163    7.  Improved instruction cache flush for POWER/PowerPC.
164        Patch by Daniel Richard G.
165    
166    8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
167        grep:
168    
169        (a) There is now no limit to the number of patterns to be matched.
170    
171        (b) An error is given if a pattern is too long.
172    
173        (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
174            are now supported.
175    
176        (d) --exclude-from and --include-from (multiple use) have been added.
177    
178        (e) Exclusions and inclusions now apply to all files and directories, not
179            just to those obtained from scanning a directory recursively.
180    
181        (f) Multiple uses of -f and --file-list are now supported.
182    
183        (g) In a Windows environment, the default for -d has been changed from
184            "read" (the GNU grep default) to "skip", because otherwise the presence
185            of a directory in the file list provokes an error.
186    
187        (h) The documentation has been revised and clarified in places.
188    
189    9.  Improve the matching speed of capturing brackets.
190    
191    10. Changed the meaning of \X so that it now matches a Unicode extended
192        grapheme cluster.
193    
194    11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
195        out POSIX threads when JIT support is configured.
196    
197    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
198    
199    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
200        structure could go wrong in environments where size_t is not the same size
201        as int.
202    
203    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
204        set.
205    
206    15. The EBCDIC support had decayed; later updates to the code had included
207        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
208        general tidy up of EBCDIC-related issues, and the documentation was also
209        not quite right. There is now a test that can be run on ASCII systems to
210        check some of the EBCDIC-related things (but is it not a full test).
211    
212    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
213        in a small tidy to the code.
214    
215    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
216    
217    18. If the --only-matching (-o) option in pcregrep is specified multiple
218        times, each one causes appropriate output. For example, -o1 -o2 outputs the
219        substrings matched by the 1st and 2nd capturing parentheses. A separating
220        string can be specified by --om-separator (default empty).
221    
222    19. Improving the first n character searches.
223    
224    20. Turn case lists for horizontal and vertical white space into macros so that
225        they are defined only once.
226    
227    21. This set of changes together give more compatible Unicode case-folding
228        behaviour for characters that have more than one other case when UCP
229        support is available.
230    
231        (a) The Unicode property table now has offsets into a new table of sets of
232            three or more characters that are case-equivalent. The MultiStage2.py
233            script that generates these tables (the pcre_ucd.c file) now scans
234            CaseFolding.txt instead of UnicodeData.txt for character case
235            information.
236    
237        (b) The code for adding characters or ranges of characters to a character
238            class has been abstracted into a generalized function that also handles
239            case-independence. In UTF-mode with UCP support, this uses the new data
240            to handle characters with more than one other case.
241    
242        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
243            whose other case is greater than 256 are now correctly matched
244            caselessly. Previously, the high codepoint matched the low one, but not
245            vice versa.
246    
247        (d) The processing of \h, \H, \v, and \ in character classes now makes use
248            of the new class addition function, using character lists defined as
249            macros alongside the case definitions of 20 above.
250    
251        (e) Caseless back references now work with characters that have more than
252            one other case.
253    
254        (f) General caseless matching of characters with more than one other case
255            is supported.
256    
257    22. Unicode character properties were updated from Unicode 6.2.0
258    
259    23. Improved CMake support under Windows. Patch by Daniel Richard G.
260    
261    24. Add support for 32-bit character strings, and UTF-32
262    
263    25. Major JIT compiler update (code refactoring and bugfixing).
264        Experimental Sparc 32 support is added.
265    
266    26. Applied a modified version of Daniel Richard G's patch to create
267        pcre.h.generic and config.h.generic by "make" instead of in the
268        PrepareRelease script.
269    
270    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
271        pcre_compile.c when checking for a zero character.
272    
273    28. Introducing a native interface for JIT. Through this interface, the compiled
274        machine code can be directly executed. The purpose of this interface is to
275        provide fast pattern matching, so several sanity checks are not performed.
276        However, feature tests are still performed. The new interface provides
277        1.4x speedup compared to the old one.
278    
279    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
280        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
281        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
282    
283    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
284        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
285        the "old" RFC 2279). Instead, it ended up passing a negative length to
286        pcre_exec().
287    
288    31. Add support for GCC's visibility feature to hide internal functions.
289    
290    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
291        "unknown -C option" after outputting 0 or 1.
292    
293    33. There is now support for generating a code coverage report for the test
294        suite in environments where gcc is the compiler and lcov is installed. This
295        is mainly for the benefit of the developers.
296    
297    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
298        unaddressable using valgrind annotations, allowing valgrind to detect
299        invalid memory accesses. This is mainly for the benefit of the developers.
300    
301    25. (*UTF) can now be used to start a pattern in any of the three libraries.
302    
303    26. Give configure error if --enable-cpp but no C++ compiler found.
304    
305    
306    Version 8.31 06-July-2012
307    -------------------------
308    
309    1.  Fixing a wrong JIT test case and some compiler warnings.
310    
311    2.  Removed a bashism from the RunTest script.
312    
313    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
314        to unsigned type, result still unsigned" that was given by an MS compiler
315        on encountering the code "-sizeof(xxx)".
316    
317    4.  Partial matching support is added to the JIT compiler.
318    
319    5.  Fixed several bugs concerned with partial matching of items that consist
320        of more than one character:
321    
322        (a) /^(..)\1/ did not partially match "aba" because checking references was
323            done on an "all or nothing" basis. This also applied to repeated
324            references.
325    
326        (b) \R did not give a hard partial match if \r was found at the end of the
327            subject.
328    
329        (c) \X did not give a hard partial match after matching one or more
330            characters at the end of the subject.
331    
332        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
333            a partial match for the string "\r".
334    
335        (e) When newline was set to CRLF, the metacharacter "." did not recognize
336            a partial match for a CR character at the end of the subject string.
337    
338    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
339        running pcretest, the text "(JIT)" added to the output whenever JIT is
340        actually used to run the match.
341    
342    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
343        or /S+[+] with a digit between 1 and 7.
344    
345    8.  OP_NOT now supports any UTF character not just single-byte ones.
346    
347    9.  (*MARK) control verb is now supported by the JIT compiler.
348    
349    10. The command "./RunTest list" lists the available tests without actually
350        running any of them. (Because I keep forgetting what they all are.)
351    
352    11. Add PCRE_INFO_MAXLOOKBEHIND.
353    
354    12. Applied a (slightly modified) user-supplied patch that improves performance
355        when the heap is used for recursion (compiled with --disable-stack-for-
356        recursion). Instead of malloc and free for each heap frame each time a
357        logical recursion happens, frames are retained on a chain and re-used where
358        possible. This sometimes gives as much as 30% improvement.
359    
360    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
361        call.
362    
363    14. As documented, (*COMMIT) is now confined to within a positive assertion.
364    
365    15. It is now possible to link pcretest with libedit as an alternative to
366        libreadline.
367    
368    16. (*COMMIT) control verb is now supported by the JIT compiler.
369    
370    17. The Unicode data tables have been updated to Unicode 6.1.0.
371    
372    18. Added --file-list option to pcregrep.
373    
374    19. Added binary file support to pcregrep, including the -a, --binary-files,
375        -I, and --text options.
376    
377    20. The madvise function is renamed for posix_madvise for QNX compatibility
378        reasons. Fixed by Giuseppe D'Angelo.
379    
380    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
381    
382    22. Changed the option for creating symbolic links for 16-bit man pages from
383        -s to -sf so that re-installing does not cause issues.
384    
385    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
386    
387    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
388        matches in certain environments (the workspace was not being correctly
389        retained). Also added to pcre_dfa_exec() a simple plausibility check on
390        some of the workspace data at the beginning of a restart.
391    
392    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
393        was not doing so when it should - probably a typo introduced by SVN 528
394        (change 8.10/14).
395    
396    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
397        \w+ when the character tables indicated that \x{c4} was a word character.
398        There were several related cases, all because the tests for doing a table
399        lookup were testing for characters less than 127 instead of 255.
400    
401    27. If a pattern contains capturing parentheses that are not used in a match,
402        their slots in the ovector are set to -1. For those that are higher than
403        any matched groups, this happens at the end of processing. In the case when
404        there were back references that the ovector was too small to contain
405        (causing temporary malloc'd memory to be used during matching), and the
406        highest capturing number was not used, memory off the end of the ovector
407        was incorrectly being set to -1. (It was using the size of the temporary
408        memory instead of the true size.)
409    
410    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
411        ovector size, it uses memory at the end of the block that it has got.
412    
413    29. Check for an overlong MARK name and give an error at compile time. The
414        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
415    
416    30. JIT compiler update.
417    
418    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
419        Rill for the patch.
420    
421    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
422    
423    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
424    
425    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
426        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
427        was enabled.
428    
429    35. Improve JIT code generation for greedy plus quantifier.
430    
431    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
432        1 to "aa" instead of to an empty string. The bug affected repeated groups
433        that could potentially match an empty string.
434    
435    37. Optimizing single character iterators in JIT.
436    
437    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
438        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
439        codepoints that are too big for the mode are faulted, and in a UTF mode,
440        disallowed codepoints are also faulted.
441    
442    39. If PCRE was compiled with UTF support, in three places in the DFA
443        matcher there was code that should only have been obeyed in UTF mode, but
444        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
445        processing when bytes with values greater than 127 were present. In 16-bit
446        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
447        both cases the values are those that cannot be the first data item in a UTF
448        character. The three items that might have provoked this were recursions,
449        possessively repeated groups, and atomic groups.
450    
451    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
452        and pcregrep, because some OS require shared objects to be explicitly
453        passed to ld, causing the link step to fail if they are not.
454    
455    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
456        mode, patterns that started with \h* or \R* might be incorrectly matched.
457    
458    
459    Version 8.30 04-February-2012
460    -----------------------------
461    
462    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
463        name is defined in ctype.h.
464    
465    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
466        only in quite long subpatterns.
467    
468    3.  Removed the function pcre_info(), which has been obsolete and deprecated
469        since it was replaced by pcre_fullinfo() in February 2000.
470    
471    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
472        match a (*MARK), and the match failed at the start of the subject, a
473        reference to memory before the start of the subject could occur. This bug
474        was introduced by fix 17 of release 8.21.
475    
476    5.  A reference to an unset group with zero minimum repetition was giving
477        totally wrong answers (in non-JavaScript-compatibility mode). For example,
478        /(another)?(\1?)test/ matched against "hello world test". This bug was
479        introduced in release 8.13.
480    
481    6.  Add support for 16-bit character strings (a large amount of work involving
482        many changes and refactorings).
483    
484    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
485        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
486        from a file.
487    
488    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
489        rounding is not applied in this particular case).
490    
491    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
492        if they appear, or are escaped, in patterns.
493    
494    10. Get rid of a number of -Wunused-but-set-variable warnings.
495    
496    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
497        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
498        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
499        also returns the mark "x". This bug applied to capturing parentheses,
500        non-capturing parentheses, and atomic parentheses. It also applied to some
501        assertions.
502    
503    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
504        information out of configure.ac instead of relying on pcre.h.generic, which
505        is not stored in the repository.
506    
507    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
508        -lreadline.
509    
510    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
511    
512    15. Applied Graycode's patch to put the top-level frame on the stack rather
513        than the heap when not using the stack for recursion. This gives a
514        performance improvement in many cases when recursion is not deep.
515    
516    16. Experimental code added to "pcretest -C" to output the stack frame size.
517    
518    
519    Version 8.21 12-Dec-2011
520    ------------------------
521    
522    1.  Updating the JIT compiler.
523    
524    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
525        are added as well.
526    
527    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
528        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
529        calling _pcre_jit_exec. Some extra comments are added.
530    
531    4.  (*MARK) settings inside atomic groups that do not contain any capturing
532        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
533        was introduced by change 18 for 8.20.
534    
535    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
536        ECMA-262 standard.
537    
538    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
539        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
540        This bug was probably introduced by change 9 of 8.13.
541    
542    7.  While fixing 6 above, I noticed that a number of other items were being
543        incorrectly rejected as "not fixed length". This arose partly because newer
544        opcodes had not been added to the fixed-length checking code. I have (a)
545        corrected the bug and added tests for these items, and (b) arranged for an
546        error to occur if an unknown opcode is encountered while checking for fixed
547        length instead of just assuming "not fixed length". The items that were
548        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
549        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
550        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
551    
552    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
553        being incorrectly compiled and would have given unpredicatble results.
554    
555    9.  A possessively repeated subpattern with minimum repeat count greater than
556        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
557        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
558        the first (A) could occur when it should not.
559    
560    10. Add a cast and remove a redundant test from the code.
561    
562    11. JIT should use pcre_malloc/pcre_free for allocation.
563    
564    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
565        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
566        is anything other than /usr, -L is still shown).
567    
568    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
569    
570    14. Perl does not support \N without a following name in a [] class; PCRE now
571        also gives an error.
572    
573    15. If a forward reference was repeated with an upper limit of around 2000,
574        it caused the error "internal error: overran compiling workspace". The
575        maximum number of forward references (including repeats) was limited by the
576        internal workspace, and dependent on the LINK_SIZE. The code has been
577        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
578        the default depends on LINK_SIZE. There is a new upper limit (for safety)
579        of around 200,000 forward references. While doing this, I also speeded up
580        the filling in of repeated forward references.
581    
582    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
583        incorrectly expecting the subject to contain another "a" after the start.
584    
585    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
586        in the match, the SKIP should be ignored. This was not happening; instead
587        the SKIP was being treated as NOMATCH. For patterns such as
588        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
589        tested.
590    
591    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
592        now much more compatible with Perl, in particular in cases where the result
593        is a non-match for a non-anchored pattern. For example, if
594        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
595        "m", where previously it did not return a name. A side effect of this
596        change is that for partial matches, the last encountered mark name is
597        returned, as for non matches. A number of tests that were previously not
598        Perl-compatible have been moved into the Perl-compatible test files. The
599        refactoring has had the pleasing side effect of removing one argument from
600        the match() function, thus reducing its stack requirements.
601    
602    19. If the /S+ option was used in pcretest to study a pattern using JIT,
603        subsequent uses of /S (without +) incorrectly behaved like /S+.
604    
605    21. Retrieve executable code size support for the JIT compiler and fixing
606        some warnings.
607    
608    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
609        not work when the shorter character appeared right at the end of the
610        subject string.
611    
612    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
613        systems.
614    
615    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
616        output it when the /M option is used in pcretest.
617    
618    25. The CheckMan script was not being included in the distribution. Also, added
619        an explicit "perl" to run Perl scripts from the PrepareRelease script
620        because this is reportedly needed in Windows.
621    
622    26. If study data was being save in a file and studying had not found a set of
623        "starts with" bytes for the pattern, the data written to the file (though
624        never used) was taken from uninitialized memory and so caused valgrind to
625        complain.
626    
627    27. Updated RunTest.bat as provided by Sheri Pierce.
628    
629    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
630    
631    29. Computation of memory usage for the table of capturing group names was
632        giving an unnecessarily large value.
633    
634    
635    Version 8.20 21-Oct-2011
636    ------------------------
637    
638    1.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had
639        a POSIX class. After further experiments with Perl, which convinced me that
640        Perl has bugs and confusions, a closing square bracket is no longer allowed
641        in a POSIX name. This bug also affected patterns with classes that started
642        with full stops.
643    
644    2.  If a pattern such as /(a)b|ac/ is matched against "ac", there is no
645        captured substring, but while checking the failing first alternative,
646        substring 1 is temporarily captured. If the output vector supplied to
647        pcre_exec() was not big enough for this capture, the yield of the function
648        was still zero ("insufficient space for captured substrings"). This cannot
649        be totally fixed without adding another stack variable, which seems a lot
650        of expense for a edge case. However, I have improved the situation in cases
651        such as /(a)(b)x|abc/ matched against "abc", where the return code
652        indicates that fewer than the maximum number of slots in the ovector have
653        been set.
654    
655    3.  Related to (2) above: when there are more back references in a pattern than
656        slots in the output vector, pcre_exec() uses temporary memory during
657        matching, and copies in the captures as far as possible afterwards. It was
658        using the entire output vector, but this conflicts with the specification
659        that only 2/3 is used for passing back captured substrings. Now it uses
660        only the first 2/3, for compatibility. This is, of course, another edge
661        case.
662    
663    4.  Zoltan Herczeg's just-in-time compiler support has been integrated into the
664        main code base, and can be used by building with --enable-jit. When this is
665        done, pcregrep automatically uses it unless --disable-pcregrep-jit or the
666        runtime --no-jit option is given.
667    
668    5.  When the number of matches in a pcre_dfa_exec() run exactly filled the
669        ovector, the return from the function was zero, implying that there were
670        other matches that did not fit. The correct "exactly full" value is now
671        returned.
672    
673    6.  If a subpattern that was called recursively or as a subroutine contained
674        (*PRUNE) or any other control that caused it to give a non-standard return,
675        invalid errors such as "Error -26 (nested recursion at the same subject
676        position)" or even infinite loops could occur.
677    
678    7.  If a pattern such as /a(*SKIP)c|b(*ACCEPT)|/ was studied, it stopped
679        computing the minimum length on reaching *ACCEPT, and so ended up with the
680        wrong value of 1 rather than 0. Further investigation indicates that
681        computing a minimum subject length in the presence of *ACCEPT is difficult
682        (think back references, subroutine calls), and so I have changed the code
683        so that no minimum is registered for a pattern that contains *ACCEPT.
684    
685    8.  If (*THEN) was present in the first (true) branch of a conditional group,
686        it was not handled as intended. [But see 16 below.]
687    
688    9.  Replaced RunTest.bat and CMakeLists.txt with improved versions provided by
689        Sheri Pierce.
690    
691    10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that
692        the first byte in a match must be "a".
693    
694    11. Change 17 for 8.13 increased the recursion depth for patterns like
695        /a(?:.)*?a/ drastically. I've improved things by remembering whether a
696        pattern contains any instances of (*THEN). If it does not, the old
697        optimizations are restored. It would be nice to do this on a per-group
698        basis, but at the moment that is not feasible.
699    
700    12. In some environments, the output of pcretest -C is CRLF terminated. This
701        broke RunTest's code that checks for the link size. A single white space
702        character after the value is now allowed for.
703    
704    13. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".
705        For "fr", it uses the Windows-specific input and output files.
706    
707    14. If (*THEN) appeared in a group that was called recursively or as a
708        subroutine, it did not work as intended. [But see next item.]
709    
710    15. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex
711        pattern fragments (but not containing any | characters). If A and B are
712        matched, but there is a failure in C so that it backtracks to (*THEN), PCRE
713        was behaving differently to Perl. PCRE backtracked into A, but Perl goes to
714        D. In other words, Perl considers parentheses that do not contain any |
715        characters to be part of a surrounding alternative, whereas PCRE was
716        treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles
717        differently. PCRE now behaves in the same way as Perl, except in the case
718        of subroutine/recursion calls such as (?1) which have in any case always
719        been different (but PCRE had them first :-).
720    
721    16. Related to 15 above: Perl does not treat the | in a conditional group as
722        creating alternatives. Such a group is treated in the same way as an
723        ordinary group without any | characters when processing (*THEN). PCRE has
724        been changed to match Perl's behaviour.
725    
726    17. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the
727        RunGrepTest script failed.
728    
729    18. Change 22 for version 13 caused atomic groups to use more stack. This is
730        inevitable for groups that contain captures, but it can lead to a lot of
731        stack use in large patterns. The old behaviour has been restored for atomic
732        groups that do not contain any capturing parentheses.
733    
734    19. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not
735        suppress the check for a minimum subject length at run time. (If it was
736        given to pcre_exec() or pcre_dfa_exec() it did work.)
737    
738    20. Fixed an ASCII-dependent infelicity in pcretest that would have made it
739        fail to work when decoding hex characters in data strings in EBCDIC
740        environments.
741    
742    21. It appears that in at least one Mac OS environment, the isxdigit() function
743        is implemented as a macro that evaluates to its argument more than once,
744        contravening the C 90 Standard (I haven't checked a later standard). There
745        was an instance in pcretest which caused it to go wrong when processing
746        \x{...} escapes in subject strings. The has been rewritten to avoid using
747        things like p++ in the argument of isxdigit().
748    
749    
750    Version 8.13 16-Aug-2011
751    ------------------------
752    
753    1.  The Unicode data tables have been updated to Unicode 6.0.0.
754    
755    2.  Two minor typos in pcre_internal.h have been fixed.
756    
757    3.  Added #include <string.h> to pcre_scanner_unittest.cc, pcrecpp.cc, and
758        pcrecpp_unittest.cc. They are needed for strcmp(), memset(), and strchr()
759        in some environments (e.g. Solaris 10/SPARC using Sun Studio 12U2).
760    
761    4.  There were a number of related bugs in the code for matching backrefences
762        caselessly in UTF-8 mode when codes for the characters concerned were
763        different numbers of bytes. For example, U+023A and U+2C65 are an upper
764        and lower case pair, using 2 and 3 bytes, respectively. The main bugs were:
765        (a) A reference to 3 copies of a 2-byte code matched only 2 of a 3-byte
766        code. (b) A reference to 2 copies of a 3-byte code would not match 2 of a
767        2-byte code at the end of the subject (it thought there wasn't enough data
768        left).
769    
770    5.  Comprehensive information about what went wrong is now returned by
771        pcre_exec() and pcre_dfa_exec() when the UTF-8 string check fails, as long
772        as the output vector has at least 2 elements. The offset of the start of
773        the failing character and a reason code are placed in the vector.
774    
775    6.  When the UTF-8 string check fails for pcre_compile(), the offset that is
776        now returned is for the first byte of the failing character, instead of the
777        last byte inspected. This is an incompatible change, but I hope it is small
778        enough not to be a problem. It makes the returned offset consistent with
779        pcre_exec() and pcre_dfa_exec().
780    
781    7.  pcretest now gives a text phrase as well as the error number when
782        pcre_exec() or pcre_dfa_exec() fails; if the error is a UTF-8 check
783        failure, the offset and reason code are output.
784    
785    8.  When \R was used with a maximizing quantifier it failed to skip backwards
786        over a \r\n pair if the subsequent match failed. Instead, it just skipped
787        back over a single character (\n). This seems wrong (because it treated the
788        two characters as a single entity when going forwards), conflicts with the
789        documentation that \R is equivalent to (?>\r\n|\n|...etc), and makes the
790        behaviour of \R* different to (\R)*, which also seems wrong. The behaviour
791        has been changed.
792    
793    9.  Some internal refactoring has changed the processing so that the handling
794        of the PCRE_CASELESS and PCRE_MULTILINE options is done entirely at compile
795        time (the PCRE_DOTALL option was changed this way some time ago: version
796        7.7 change 16). This has made it possible to abolish the OP_OPT op code,
797        which was always a bit of a fudge. It also means that there is one less
798        argument for the match() function, which reduces its stack requirements
799        slightly. This change also fixes an incompatibility with Perl: the pattern
800        (?i:([^b]))(?1) should not match "ab", but previously PCRE gave a match.
801    
802    10. More internal refactoring has drastically reduced the number of recursive
803        calls to match() for possessively repeated groups such as (abc)++ when
804        using pcre_exec().
805    
806    11. While implementing 10, a number of bugs in the handling of groups were
807        discovered and fixed:
808    
809        (?<=(a)+) was not diagnosed as invalid (non-fixed-length lookbehind).
810        (a|)*(?1) gave a compile-time internal error.
811        ((a|)+)+  did not notice that the outer group could match an empty string.
812        (^a|^)+   was not marked as anchored.
813        (.*a|.*)+ was not marked as matching at start or after a newline.
814    
815    12. Yet more internal refactoring has removed another argument from the match()
816        function. Special calls to this function are now indicated by setting a
817        value in a variable in the "match data" data block.
818    
819    13. Be more explicit in pcre_study() instead of relying on "default" for
820        opcodes that mean there is no starting character; this means that when new
821        ones are added and accidentally left out of pcre_study(), testing should
822        pick them up.
823    
824    14. The -s option of pcretest has been documented for ages as being an old
825        synonym of -m (show memory usage). I have changed it to mean "force study
826        for every regex", that is, assume /S for every regex. This is similar to -i
827        and -d etc. It's slightly incompatible, but I'm hoping nobody is still
828        using it. It makes it easier to run collections of tests with and without
829        study enabled, and thereby test pcre_study() more easily. All the standard
830        tests are now run with and without -s (but some patterns can be marked as
831        "never study" - see 20 below).
832    
833    15. When (*ACCEPT) was used in a subpattern that was called recursively, the
834        restoration of the capturing data to the outer values was not happening
835        correctly.
836    
837    16. If a recursively called subpattern ended with (*ACCEPT) and matched an
838        empty string, and PCRE_NOTEMPTY was set, pcre_exec() thought the whole
839        pattern had matched an empty string, and so incorrectly returned a no
840        match.
841    
842    17. There was optimizing code for the last branch of non-capturing parentheses,
843        and also for the obeyed branch of a conditional subexpression, which used
844        tail recursion to cut down on stack usage. Unfortunately, now that there is
845        the possibility of (*THEN) occurring in these branches, tail recursion is
846        no longer possible because the return has to be checked for (*THEN). These
847        two optimizations have therefore been removed. [But see 8.20/11 above.]
848    
849    18. If a pattern containing \R was studied, it was assumed that \R always
850        matched two bytes, thus causing the minimum subject length to be
851        incorrectly computed because \R can also match just one byte.
852    
853    19. If a pattern containing (*ACCEPT) was studied, the minimum subject length
854        was incorrectly computed.
855    
856    20. If /S is present twice on a test pattern in pcretest input, it now
857        *disables* studying, thereby overriding the use of -s on the command line
858        (see 14 above). This is necessary for one or two tests to keep the output
859        identical in both cases.
860    
861    21. When (*ACCEPT) was used in an assertion that matched an empty string and
862        PCRE_NOTEMPTY was set, PCRE applied the non-empty test to the assertion.
863    
864    22. When an atomic group that contained a capturing parenthesis was
865        successfully matched, but the branch in which it appeared failed, the
866        capturing was not being forgotten if a higher numbered group was later
867        captured. For example, /(?>(a))b|(a)c/ when matching "ac" set capturing
868        group 1 to "a", when in fact it should be unset. This applied to multi-
869        branched capturing and non-capturing groups, repeated or not, and also to
870        positive assertions (capturing in negative assertions does not happen
871        in PCRE) and also to nested atomic groups.
872    
873    23. Add the ++ qualifier feature to pcretest, to show the remainder of the
874        subject after a captured substring, to make it easier to tell which of a
875        number of identical substrings has been captured.
876    
877    24. The way atomic groups are processed by pcre_exec() has been changed so that
878        if they are repeated, backtracking one repetition now resets captured
879        values correctly. For example, if ((?>(a+)b)+aabab) is matched against
880        "aaaabaaabaabab" the value of captured group 2 is now correctly recorded as
881        "aaa". Previously, it would have been "a". As part of this code
882        refactoring, the way recursive calls are handled has also been changed.
883    
884    25. If an assertion condition captured any substrings, they were not passed
885        back unless some other capturing happened later. For example, if
886        (?(?=(a))a) was matched against "a", no capturing was returned.
887    
888    26. When studying a pattern that contained subroutine calls or assertions,
889        the code for finding the minimum length of a possible match was handling
890        direct recursions such as (xxx(?1)|yyy) but not mutual recursions (where
891        group 1 called group 2 while simultaneously a separate group 2 called group
892        1). A stack overflow occurred in this case. I have fixed this by limiting
893        the recursion depth to 10.
894    
895    27. Updated RunTest.bat in the distribution to the version supplied by Tom
896        Fortmann. This supports explicit test numbers on the command line, and has
897        argument validation and error reporting.
898    
899    28. An instance of \X with an unlimited repeat could fail if at any point the
900        first character it looked at was a mark character.
901    
902    29. Some minor code refactoring concerning Unicode properties and scripts
903        should reduce the stack requirement of match() slightly.
904    
905    30. Added the '=' option to pcretest to check the setting of unused capturing
906        slots at the end of the pattern, which are documented as being -1, but are
907        not included in the return count.
908    
909    31. If \k was not followed by a braced, angle-bracketed, or quoted name, PCRE
910        compiled something random. Now it gives a compile-time error (as does
911        Perl).
912    
913    32. A *MARK encountered during the processing of a positive assertion is now
914        recorded and passed back (compatible with Perl).
915    
916    33. If --only-matching or --colour was set on a pcregrep call whose pattern
917        had alternative anchored branches, the search for a second match in a line
918        was done as if at the line start. Thus, for example, /^01|^02/ incorrectly
919        matched the line "0102" twice. The same bug affected patterns that started
920        with a backwards assertion. For example /\b01|\b02/ also matched "0102"
921        twice.
922    
923    34. Previously, PCRE did not allow quantification of assertions. However, Perl
924        does, and because of capturing effects, quantifying parenthesized
925        assertions may at times be useful. Quantifiers are now allowed for
926        parenthesized assertions.
927    
928    35. A minor code tidy in pcre_compile() when checking options for \R usage.
929    
930    36. \g was being checked for fancy things in a character class, when it should
931        just be a literal "g".
932    
933    37. PCRE was rejecting [:a[:digit:]] whereas Perl was not. It seems that the
934        appearance of a nested POSIX class supersedes an apparent external class.
935        For example, [:a[:digit:]b:] matches "a", "b", ":", or a digit. Also,
936        unescaped square brackets may also appear as part of class names. For
937        example, [:a[:abc]b:] gives unknown class "[:abc]b:]". PCRE now behaves
938        more like Perl. (But see 8.20/1 above.)
939    
940    38. PCRE was giving an error for \N with a braced quantifier such as {1,} (this
941        was because it thought it was \N{name}, which is not supported).
942    
943    39. Add minix to OS list not supporting the -S option in pcretest.
944    
945    40. PCRE tries to detect cases of infinite recursion at compile time, but it
946        cannot analyze patterns in sufficient detail to catch mutual recursions
947        such as ((?1))((?2)). There is now a runtime test that gives an error if a
948        subgroup is called recursively as a subpattern for a second time at the
949        same position in the subject string. In previous releases this might have
950        been caught by the recursion limit, or it might have run out of stack.
951    
952    41. A pattern such as /(?(R)a+|(?R)b)/ is quite safe, as the recursion can
953        happen only once. PCRE was, however incorrectly giving a compile time error
954        "recursive call could loop indefinitely" because it cannot analyze the
955        pattern in sufficient detail. The compile time test no longer happens when
956        PCRE is compiling a conditional subpattern, but actual runaway loops are
957        now caught at runtime (see 40 above).
958    
959    42. It seems that Perl allows any characters other than a closing parenthesis
960        to be part of the NAME in (*MARK:NAME) and other backtracking verbs. PCRE
961        has been changed to be the same.
962    
963    43. Updated configure.ac to put in more quoting round AC_LANG_PROGRAM etc. so
964        as not to get warnings when autogen.sh is called. Also changed
965        AC_PROG_LIBTOOL (deprecated) to LT_INIT (the current macro).
966    
967    44. To help people who use pcregrep to scan files containing exceedingly long
968        lines, the following changes have been made:
969    
970        (a) The default value of the buffer size parameter has been increased from
971            8K to 20K. (The actual buffer used is three times this size.)
972    
973        (b) The default can be changed by ./configure --with-pcregrep-bufsize when
974            PCRE is built.
975    
976        (c) A --buffer-size=n option has been added to pcregrep, to allow the size
977            to be set at run time.
978    
979        (d) Numerical values in pcregrep options can be followed by K or M, for
980            example --buffer-size=50K.
981    
982        (e) If a line being scanned overflows pcregrep's buffer, an error is now
983            given and the return code is set to 2.
984    
985    45. Add a pointer to the latest mark to the callout data block.
986    
987    46. The pattern /.(*F)/, when applied to "abc" with PCRE_PARTIAL_HARD, gave a
988        partial match of an empty string instead of no match. This was specific to
989        the use of ".".
990    
991    47. The pattern /f.*/8s, when applied to "for" with PCRE_PARTIAL_HARD, gave a
992        complete match instead of a partial match. This bug was dependent on both
993        the PCRE_UTF8 and PCRE_DOTALL options being set.
994    
995    48. For a pattern such as /\babc|\bdef/ pcre_study() was failing to set up the
996        starting byte set, because \b was not being ignored.
997    
998    
999    Version 8.12 15-Jan-2011
1000    ------------------------
1001    
1002    1.  Fixed some typos in the markup of the man pages, and wrote a script that
1003        checks for such things as part of the documentation building process.
1004    
1005    2.  On a big-endian 64-bit system, pcregrep did not correctly process the
1006        --match-limit and --recursion-limit options (added for 8.11). In
1007        particular, this made one of the standard tests fail. (The integer value
1008        went into the wrong half of a long int.)
1009    
1010    3.  If the --colour option was given to pcregrep with -v (invert match), it
1011        did strange things, either producing crazy output, or crashing. It should,
1012        of course, ignore a request for colour when reporting lines that do not
1013        match.
1014    
1015    4.  Another pcregrep bug caused similar problems if --colour was specified with
1016        -M (multiline) and the pattern match finished with a line ending.
1017    
1018    5.  In pcregrep, when a pattern that ended with a literal newline sequence was
1019        matched in multiline mode, the following line was shown as part of the
1020        match. This seems wrong, so I have changed it.
1021    
1022    6.  Another pcregrep bug in multiline mode, when --colour was specified, caused
1023        the check for further matches in the same line (so they could be coloured)
1024        to overrun the end of the current line. If another match was found, it was
1025        incorrectly shown (and then shown again when found in the next line).
1026    
1027    7.  If pcregrep was compiled under Windows, there was a reference to the
1028        function pcregrep_exit() before it was defined. I am assuming this was
1029        the cause of the "error C2371: 'pcregrep_exit' : redefinition;" that was
1030        reported by a user. I've moved the definition above the reference.
1031    
1032    
1033    Version 8.11 10-Dec-2010
1034    ------------------------
1035    
1036    1.  (*THEN) was not working properly if there were untried alternatives prior
1037        to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
1038        backtracked to try for "b" instead of moving to the next alternative branch
1039        at the same level (in this case, to look for "c"). The Perl documentation
1040        is clear that when (*THEN) is backtracked onto, it goes to the "next
1041        alternative in the innermost enclosing group".
1042    
1043    2.  (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
1044        such as   (A(*COMMIT)B(*THEN)C|D)  any failure after matching A should
1045        result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
1046        (*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
1047        (*THEN).
1048    
1049    3.  If \s appeared in a character class, it removed the VT character from
1050        the class, even if it had been included by some previous item, for example
1051        in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
1052        of \s, but is part of the POSIX "space" class.)
1053    
1054    4.  A partial match never returns an empty string (because you can always
1055        match an empty string at the end of the subject); however the checking for
1056        an empty string was starting at the "start of match" point. This has been
1057        changed to the "earliest inspected character" point, because the returned
1058        data for a partial match starts at this character. This means that, for
1059        example, /(?<=abc)def/ gives a partial match for the subject "abc"
1060        (previously it gave "no match").
1061    
1062    5.  Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
1063        of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
1064        previously a full match would be given. However, setting PCRE_PARTIAL_HARD
1065        has an implication that the given string is incomplete (because a partial
1066        match is preferred over a full match). For this reason, these items now
1067        give a partial match in this situation. [Aside: previously, the one case
1068        /t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
1069        match rather than a full match, which was wrong by the old rules, but is
1070        now correct.]
1071    
1072    6.  There was a bug in the handling of #-introduced comments, recognized when
1073        PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
1074        If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
1075        UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
1076        scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
1077        but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
1078        places in pcre_compile().
1079    
1080    7.  Related to (6) above, when pcre_compile() was skipping #-introduced
1081        comments when looking ahead for named forward references to subpatterns,
1082        the only newline sequence it recognized was NL. It now handles newlines
1083        according to the set newline convention.
1084    
1085    8.  SunOS4 doesn't have strerror() or strtoul(); pcregrep dealt with the
1086        former, but used strtoul(), whereas pcretest avoided strtoul() but did not
1087        cater for a lack of strerror(). These oversights have been fixed.
1088    
1089    9.  Added --match-limit and --recursion-limit to pcregrep.
1090    
1091    10. Added two casts needed to build with Visual Studio when NO_RECURSE is set.
1092    
1093    11. When the -o option was used, pcregrep was setting a return code of 1, even
1094        when matches were found, and --line-buffered was not being honoured.
1095    
1096    12. Added an optional parentheses number to the -o and --only-matching options
1097        of pcregrep.
1098    
1099    13. Imitating Perl's /g action for multiple matches is tricky when the pattern
1100        can match an empty string. The code to do it in pcretest and pcredemo
1101        needed fixing:
1102    
1103        (a) When the newline convention was "crlf", pcretest got it wrong, skipping
1104            only one byte after an empty string match just before CRLF (this case
1105            just got forgotten; "any" and "anycrlf" were OK).
1106    
1107        (b) The pcretest code also had a bug, causing it to loop forever in UTF-8
1108            mode when an empty string match preceded an ASCII character followed by
1109            a non-ASCII character. (The code for advancing by one character rather
1110            than one byte was nonsense.)
1111    
1112        (c) The pcredemo.c sample program did not have any code at all to handle
1113            the cases when CRLF is a valid newline sequence.
1114    
1115    14. Neither pcre_exec() nor pcre_dfa_exec() was checking that the value given
1116        as a starting offset was within the subject string. There is now a new
1117        error, PCRE_ERROR_BADOFFSET, which is returned if the starting offset is
1118        negative or greater than the length of the string. In order to test this,
1119        pcretest is extended to allow the setting of negative starting offsets.
1120    
1121    15. In both pcre_exec() and pcre_dfa_exec() the code for checking that the
1122        starting offset points to the beginning of a UTF-8 character was
1123        unnecessarily clumsy. I tidied it up.
1124    
1125    16. Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
1126        bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
1127    
1128    17. Nobody had reported that the --include_dir option, which was added in
1129        release 7.7 should have been called --include-dir (hyphen, not underscore)
1130        for compatibility with GNU grep. I have changed it to --include-dir, but
1131        left --include_dir as an undocumented synonym, and the same for
1132        --exclude-dir, though that is not available in GNU grep, at least as of
1133        release 2.5.4.
1134    
1135    18. At a user's suggestion, the macros GETCHAR and friends (which pick up UTF-8
1136        characters from a string of bytes) have been redefined so as not to use
1137        loops, in order to improve performance in some environments. At the same
1138        time, I abstracted some of the common code into auxiliary macros to save
1139        repetition (this should not affect the compiled code).
1140    
1141    19. If \c was followed by a multibyte UTF-8 character, bad things happened. A
1142        compile-time error is now given if \c is not followed by an ASCII
1143        character, that is, a byte less than 128. (In EBCDIC mode, the code is
1144        different, and any byte value is allowed.)
1145    
1146    20. Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
1147        START_OPTIMIZE option, which is now allowed at compile time - but just
1148        passed through to pcre_exec() or pcre_dfa_exec(). This makes it available
1149        to pcregrep and other applications that have no direct access to PCRE
1150        options. The new /Y option in pcretest sets this option when calling
1151        pcre_compile().
1152    
1153    21. Change 18 of release 8.01 broke the use of named subpatterns for recursive
1154        back references. Groups containing recursive back references were forced to
1155        be atomic by that change, but in the case of named groups, the amount of
1156        memory required was incorrectly computed, leading to "Failed: internal
1157        error: code overflow". This has been fixed.
1158    
1159    22. Some patches to pcre_stringpiece.h, pcre_stringpiece_unittest.cc, and
1160        pcretest.c, to avoid build problems in some Borland environments.
1161    
1162    
1163    Version 8.10 25-Jun-2010
1164    ------------------------
1165    
1166    1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
1167        THEN.
1168    
1169    2.  (*ACCEPT) was not working when inside an atomic group.
1170    
1171    3.  Inside a character class, \B is treated as a literal by default, but
1172        faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
1173        causes the error). The code is unchanged, but I tidied the documentation.
1174    
1175    4.  Inside a character class, PCRE always treated \R and \X as literals,
1176        whereas Perl faults them if its -w option is set. I have changed PCRE so
1177        that it faults them when PCRE_EXTRA is set.
1178    
1179    5.  Added support for \N, which always matches any character other than
1180        newline. (It is the same as "." when PCRE_DOTALL is not set.)
1181    
1182    6.  When compiling pcregrep with newer versions of gcc which may have
1183        FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
1184        declared with attribute warn_unused_result" were given. Just casting the
1185        result to (void) does not stop the warnings; a more elaborate fudge is
1186        needed. I've used a macro to implement this.
1187    
1188    7.  Minor change to pcretest.c to avoid a compiler warning.
1189    
1190    8.  Added four artifical Unicode properties to help with an option to make
1191        \s etc use properties (see next item). The new properties are: Xan
1192        (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
1193    
1194    9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
1195        use Unicode properties. (*UCP) at the start of a pattern can be used to set
1196        this option. Modified pcretest to add /W to test this facility. Added
1197        REG_UCP to make it available via the POSIX interface.
1198    
1199    10. Added --line-buffered to pcregrep.
1200    
1201    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
1202        studied, and the match started with a letter with a code point greater than
1203        127 whose first byte was different to the first byte of the other case of
1204        the letter, the other case of this starting letter was not recognized
1205        (#976).
1206    
1207    12. If a pattern that was studied started with a repeated Unicode property
1208        test, for example, \p{Nd}+, there was the theoretical possibility of
1209        setting up an incorrect bitmap of starting bytes, but fortunately it could
1210        not have actually happened in practice until change 8 above was made (it
1211        added property types that matched character-matching opcodes).
1212    
1213    13. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
1214        possible starting bytes for non-anchored patterns.
1215    
1216    14. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes
1217        \R, and also a number of cases that involve Unicode properties, both
1218        explicit and implicit when PCRE_UCP is set.
1219    
1220    15. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
1221        input, it could crash or give wrong results if characters with values
1222        greater than 0xc0 were present in the subject string. (Detail: it assumed
1223        UTF-8 input when processing these items.)
1224    
1225    16. Added a lot of (int) casts to avoid compiler warnings in systems where
1226        size_t is 64-bit (#991).
1227    
1228    17. Added a check for running out of memory when PCRE is compiled with
1229        --disable-stack-for-recursion (#990).
1230    
1231    18. If the last data line in a file for pcretest does not have a newline on
1232        the end, a newline was missing in the output.
1233    
1234    19. The default pcre_chartables.c file recognizes only ASCII characters (values
1235        less than 128) in its various bitmaps. However, there is a facility for
1236        generating tables according to the current locale when PCRE is compiled. It
1237        turns out that in some environments, 0x85 and 0xa0, which are Unicode space
1238        characters, are recognized by isspace() and therefore were getting set in
1239        these tables, and indeed these tables seem to approximate to ISO 8859. This
1240        caused a problem in UTF-8 mode when pcre_study() was used to create a list
1241        of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
1242        which of course cannot start UTF-8 characters. I have changed the code so
1243        that only real ASCII characters (less than 128) and the correct starting
1244        bytes for UTF-8 encodings are set for characters greater than 127 when in
1245        UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
1246        altogether.)
1247    
1248    20. Added the /T option to pcretest so as to be able to run tests with non-
1249        standard character tables, thus making it possible to include the tests
1250        used for 19 above in the standard set of tests.
1251    
1252    21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
1253        reference to a subpattern the other side of a comment that contains an
1254        opening parenthesis caused either an internal compiling error, or a
1255        reference to the wrong subpattern.
1256    
1257    
1258    Version 8.02 19-Mar-2010
1259  ------------------------  ------------------------
1260    
1261  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.
1262    
1263  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
1264      configured.      configured.
1265    
1266  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
1267      original author of that file, following a query about its status.      original author of that file, following a query about its status.
1268    
1269  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
1270      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.
1271    
1272  5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive  5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
1273      quantifier applied to a forward-referencing subroutine call, could compile      quantifier applied to a forward-referencing subroutine call, could compile
1274      incorrect code or give the error "internal error: previously-checked      incorrect code or give the error "internal error: previously-checked
1275      referenced subpattern not found".      referenced subpattern not found".
1276    
1277  6.  Both MS Visual Studio and Symbian OS have problems with initializing  6.  Both MS Visual Studio and Symbian OS have problems with initializing
1278      variables to point to external functions. For these systems, therefore,      variables to point to external functions. For these systems, therefore,
1279      pcre_malloc etc. are now initialized to local functions that call the      pcre_malloc etc. are now initialized to local functions that call the
1280      relevant global functions.      relevant global functions.
1281    
1282  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
1283      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.
1284      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
1285      the lengths are correct (equal to the number of opcodes).      the lengths are correct (equal to the number of opcodes).
1286    
1287  8.  Following on from 7, I added a similar kludge to check the length of the  8.  Following on from 7, I added a similar kludge to check the length of the
1288      eint vector in pcreposix.c.      eint vector in pcreposix.c.
1289    
1290  9.  Error texts for pcre_compile() are held as one long string to avoid too  9.  Error texts for pcre_compile() are held as one long string to avoid too
1291      much relocation at load time. To find a text, the string is searched,      much relocation at load time. To find a text, the string is searched,
1292      counting zeros. There was no check for running off the end of the string,      counting zeros. There was no check for running off the end of the string,
1293      which could happen if a new error number was added without updating the      which could happen if a new error number was added without updating the
1294      string.      string.
1295    
1296  10. \K gave a compile-time error if it appeared in a lookbehind assersion.  10. \K gave a compile-time error if it appeared in a lookbehind assersion.
1297    
1298  11. \K was not working if it appeared in an atomic group or in a group that  11. \K was not working if it appeared in an atomic group or in a group that
1299      was called as a "subroutine", or in an assertion. Perl 5.11 documents that      was called as a "subroutine", or in an assertion. Perl 5.11 documents that
1300      \K is "not well defined" if used in an assertion. PCRE now accepts it if      \K is "not well defined" if used in an assertion. PCRE now accepts it if
1301      the assertion is positive, but not if it is negative.      the assertion is positive, but not if it is negative.
1302    
1303  12. Change 11 fortuitously reduced the size of the stack frame used in the  12. Change 11 fortuitously reduced the size of the stack frame used in the
1304      "match()" function of pcre_exec.c by one pointer. Forthcoming      "match()" function of pcre_exec.c by one pointer. Forthcoming
1305      implementation of support for (*MARK) will need an extra pointer on the      implementation of support for (*MARK) will need an extra pointer on the
1306      stack; I have reserved it now, so that the stack frame size does not      stack; I have reserved it now, so that the stack frame size does not
1307      decrease.      decrease.
1308    
1309  13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other  13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other
1310      item in branch that calls a recursion is a subroutine call - as in the      item in branch that calls a recursion is a subroutine call - as in the
1311      second branch in the above example - was incorrectly given the compile-      second branch in the above example - was incorrectly given the compile-
1312      time error "recursive call could loop indefinitely" because pcre_compile()      time error "recursive call could loop indefinitely" because pcre_compile()
1313      was not correctly checking the subroutine for matching a non-empty string.      was not correctly checking the subroutine for matching a non-empty string.
1314    
1315  14. The checks for overrunning compiling workspace could trigger after an  14. The checks for overrunning compiling workspace could trigger after an
1316      overrun had occurred. This is a "should never occur" error, but it can be      overrun had occurred. This is a "should never occur" error, but it can be
1317      triggered by pathological patterns such as hundreds of nested parentheses.      triggered by pathological patterns such as hundreds of nested parentheses.
1318      The checks now trigger 100 bytes before the end of the workspace.      The checks now trigger 100 bytes before the end of the workspace.
1319    
1320    15. Fix typo in configure.ac: "srtoq" should be "strtoq".
1321    
1322    
1323  Version 8.01 19-Jan-2010  Version 8.01 19-Jan-2010

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