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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 8.02 10-Mar-2010  Version 8.30
5    ------------
7    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
8        name is defined in ctype.h.
10    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
11        only in quite long subpatterns.
13    3.  Removed the function pcre_info(), which has been obsolete and deprecated
14        since it was replaced by pcre_fullinfo() in February 2000.
16    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
17        match a (*MARK), and the match failed at the start of the subject, a
18        reference to memory before the start of the subject could occur. This bug
19        was introduced by fix 17 of release 8.21.
21    5.  A reference to an unset group with zero minimum repetition was giving
22        totally wrong answers (in non-JavaScript-compatibility mode). For example,
23        /(another)?(\1?)test/ matched against "hello world test". This bug was
24        introduced in release 8.13.
26    6.  Add support for 16-bit character strings (a large amount of work involving
27        many changes and refactorings).
29    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
30        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
31        from a file.
33    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
34        rounding is not applied in this particular case).
36    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
37        if they appear, or are escaped, in patterns.
40    Version 8.21 12-Dec-2011
41    ------------------------
43    1.  Updating the JIT compiler.
45    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
46        are added as well.
48    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
49        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
50        calling _pcre_jit_exec. Some extra comments are added.
52    4.  (*MARK) settings inside atomic groups that do not contain any capturing
53        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
54        was introduced by change 18 for 8.20.
56    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
57        ECMA-262 standard.
59    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
60        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
61        This bug was probably introduced by change 9 of 8.13.
63    7.  While fixing 6 above, I noticed that a number of other items were being
64        incorrectly rejected as "not fixed length". This arose partly because newer
65        opcodes had not been added to the fixed-length checking code. I have (a)
66        corrected the bug and added tests for these items, and (b) arranged for an
67        error to occur if an unknown opcode is encountered while checking for fixed
68        length instead of just assuming "not fixed length". The items that were
69        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
70        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
71        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
73    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
74        being incorrectly compiled and would have given unpredicatble results.
76    9.  A possessively repeated subpattern with minimum repeat count greater than
77        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
78        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
79        the first (A) could occur when it should not.
81    10. Add a cast and remove a redundant test from the code.
83    11. JIT should use pcre_malloc/pcre_free for allocation.
85    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
86        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
87        is anything other than /usr, -L is still shown).
89    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
91    14. Perl does not support \N without a following name in a [] class; PCRE now
92        also gives an error.
94    15. If a forward reference was repeated with an upper limit of around 2000,
95        it caused the error "internal error: overran compiling workspace". The
96        maximum number of forward references (including repeats) was limited by the
97        internal workspace, and dependent on the LINK_SIZE. The code has been
98        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
99        the default depends on LINK_SIZE. There is a new upper limit (for safety)
100        of around 200,000 forward references. While doing this, I also speeded up
101        the filling in of repeated forward references.
103    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
104        incorrectly expecting the subject to contain another "a" after the start.
106    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
107        in the match, the SKIP should be ignored. This was not happening; instead
108        the SKIP was being treated as NOMATCH. For patterns such as
109        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
110        tested.
112    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
113        now much more compatible with Perl, in particular in cases where the result
114        is a non-match for a non-anchored pattern. For example, if
115        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
116        "m", where previously it did not return a name. A side effect of this
117        change is that for partial matches, the last encountered mark name is
118        returned, as for non matches. A number of tests that were previously not
119        Perl-compatible have been moved into the Perl-compatible test files. The
120        refactoring has had the pleasing side effect of removing one argument from
121        the match() function, thus reducing its stack requirements.
123    19. If the /S+ option was used in pcretest to study a pattern using JIT,
124        subsequent uses of /S (without +) incorrectly behaved like /S+.
126    21. Retrieve executable code size support for the JIT compiler and fixing
127        some warnings.
129    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
130        not work when the shorter character appeared right at the end of the
131        subject string.
133    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
134        systems.
136    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
137        output it when the /M option is used in pcretest.
139    25. The CheckMan script was not being included in the distribution. Also, added
140        an explicit "perl" to run Perl scripts from the PrepareRelease script
141        because this is reportedly needed in Windows.
143    26. If study data was being save in a file and studying had not found a set of
144        "starts with" bytes for the pattern, the data written to the file (though
145        never used) was taken from uninitialized memory and so caused valgrind to
146        complain.
148    27. Updated RunTest.bat as provided by Sheri Pierce.
150    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
152    29. Computation of memory usage for the table of capturing group names was
153        giving an unnecessarily large value.
156    Version 8.20 21-Oct-2011
157    ------------------------
159    1.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had
160        a POSIX class. After further experiments with Perl, which convinced me that
161        Perl has bugs and confusions, a closing square bracket is no longer allowed
162        in a POSIX name. This bug also affected patterns with classes that started
163        with full stops.
165    2.  If a pattern such as /(a)b|ac/ is matched against "ac", there is no
166        captured substring, but while checking the failing first alternative,
167        substring 1 is temporarily captured. If the output vector supplied to
168        pcre_exec() was not big enough for this capture, the yield of the function
169        was still zero ("insufficient space for captured substrings"). This cannot
170        be totally fixed without adding another stack variable, which seems a lot
171        of expense for a edge case. However, I have improved the situation in cases
172        such as /(a)(b)x|abc/ matched against "abc", where the return code
173        indicates that fewer than the maximum number of slots in the ovector have
174        been set.
176    3.  Related to (2) above: when there are more back references in a pattern than
177        slots in the output vector, pcre_exec() uses temporary memory during
178        matching, and copies in the captures as far as possible afterwards. It was
179        using the entire output vector, but this conflicts with the specification
180        that only 2/3 is used for passing back captured substrings. Now it uses
181        only the first 2/3, for compatibility. This is, of course, another edge
182        case.
184    4.  Zoltan Herczeg's just-in-time compiler support has been integrated into the
185        main code base, and can be used by building with --enable-jit. When this is
186        done, pcregrep automatically uses it unless --disable-pcregrep-jit or the
187        runtime --no-jit option is given.
189    5.  When the number of matches in a pcre_dfa_exec() run exactly filled the
190        ovector, the return from the function was zero, implying that there were
191        other matches that did not fit. The correct "exactly full" value is now
192        returned.
194    6.  If a subpattern that was called recursively or as a subroutine contained
195        (*PRUNE) or any other control that caused it to give a non-standard return,
196        invalid errors such as "Error -26 (nested recursion at the same subject
197        position)" or even infinite loops could occur.
199    7.  If a pattern such as /a(*SKIP)c|b(*ACCEPT)|/ was studied, it stopped
200        computing the minimum length on reaching *ACCEPT, and so ended up with the
201        wrong value of 1 rather than 0. Further investigation indicates that
202        computing a minimum subject length in the presence of *ACCEPT is difficult
203        (think back references, subroutine calls), and so I have changed the code
204        so that no minimum is registered for a pattern that contains *ACCEPT.
206    8.  If (*THEN) was present in the first (true) branch of a conditional group,
207        it was not handled as intended. [But see 16 below.]
209    9.  Replaced RunTest.bat and CMakeLists.txt with improved versions provided by
210        Sheri Pierce.
212    10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that
213        the first byte in a match must be "a".
215    11. Change 17 for 8.13 increased the recursion depth for patterns like
216        /a(?:.)*?a/ drastically. I've improved things by remembering whether a
217        pattern contains any instances of (*THEN). If it does not, the old
218        optimizations are restored. It would be nice to do this on a per-group
219        basis, but at the moment that is not feasible.
221    12. In some environments, the output of pcretest -C is CRLF terminated. This
222        broke RunTest's code that checks for the link size. A single white space
223        character after the value is now allowed for.
225    13. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".
226        For "fr", it uses the Windows-specific input and output files.
228    14. If (*THEN) appeared in a group that was called recursively or as a
229        subroutine, it did not work as intended. [But see next item.]
231    15. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex
232        pattern fragments (but not containing any | characters). If A and B are
233        matched, but there is a failure in C so that it backtracks to (*THEN), PCRE
234        was behaving differently to Perl. PCRE backtracked into A, but Perl goes to
235        D. In other words, Perl considers parentheses that do not contain any |
236        characters to be part of a surrounding alternative, whereas PCRE was
237        treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles
238        differently. PCRE now behaves in the same way as Perl, except in the case
239        of subroutine/recursion calls such as (?1) which have in any case always
240        been different (but PCRE had them first :-).
242    16. Related to 15 above: Perl does not treat the | in a conditional group as
243        creating alternatives. Such a group is treated in the same way as an
244        ordinary group without any | characters when processing (*THEN). PCRE has
245        been changed to match Perl's behaviour.
247    17. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the
248        RunGrepTest script failed.
250    18. Change 22 for version 13 caused atomic groups to use more stack. This is
251        inevitable for groups that contain captures, but it can lead to a lot of
252        stack use in large patterns. The old behaviour has been restored for atomic
253        groups that do not contain any capturing parentheses.
255    19. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not
256        suppress the check for a minimum subject length at run time. (If it was
257        given to pcre_exec() or pcre_dfa_exec() it did work.)
259    20. Fixed an ASCII-dependent infelicity in pcretest that would have made it
260        fail to work when decoding hex characters in data strings in EBCDIC
261        environments.
263    21. It appears that in at least one Mac OS environment, the isxdigit() function
264        is implemented as a macro that evaluates to its argument more than once,
265        contravening the C 90 Standard (I haven't checked a later standard). There
266        was an instance in pcretest which caused it to go wrong when processing
267        \x{...} escapes in subject strings. The has been rewritten to avoid using
268        things like p++ in the argument of isxdigit().
271    Version 8.13 16-Aug-2011
272    ------------------------
274    1.  The Unicode data tables have been updated to Unicode 6.0.0.
276    2.  Two minor typos in pcre_internal.h have been fixed.
278    3.  Added #include <string.h> to pcre_scanner_unittest.cc, pcrecpp.cc, and
279        pcrecpp_unittest.cc. They are needed for strcmp(), memset(), and strchr()
280        in some environments (e.g. Solaris 10/SPARC using Sun Studio 12U2).
282    4.  There were a number of related bugs in the code for matching backrefences
283        caselessly in UTF-8 mode when codes for the characters concerned were
284        different numbers of bytes. For example, U+023A and U+2C65 are an upper
285        and lower case pair, using 2 and 3 bytes, respectively. The main bugs were:
286        (a) A reference to 3 copies of a 2-byte code matched only 2 of a 3-byte
287        code. (b) A reference to 2 copies of a 3-byte code would not match 2 of a
288        2-byte code at the end of the subject (it thought there wasn't enough data
289        left).
291    5.  Comprehensive information about what went wrong is now returned by
292        pcre_exec() and pcre_dfa_exec() when the UTF-8 string check fails, as long
293        as the output vector has at least 2 elements. The offset of the start of
294        the failing character and a reason code are placed in the vector.
296    6.  When the UTF-8 string check fails for pcre_compile(), the offset that is
297        now returned is for the first byte of the failing character, instead of the
298        last byte inspected. This is an incompatible change, but I hope it is small
299        enough not to be a problem. It makes the returned offset consistent with
300        pcre_exec() and pcre_dfa_exec().
302    7.  pcretest now gives a text phrase as well as the error number when
303        pcre_exec() or pcre_dfa_exec() fails; if the error is a UTF-8 check
304        failure, the offset and reason code are output.
306    8.  When \R was used with a maximizing quantifier it failed to skip backwards
307        over a \r\n pair if the subsequent match failed. Instead, it just skipped
308        back over a single character (\n). This seems wrong (because it treated the
309        two characters as a single entity when going forwards), conflicts with the
310        documentation that \R is equivalent to (?>\r\n|\n|...etc), and makes the
311        behaviour of \R* different to (\R)*, which also seems wrong. The behaviour
312        has been changed.
314    9.  Some internal refactoring has changed the processing so that the handling
315        of the PCRE_CASELESS and PCRE_MULTILINE options is done entirely at compile
316        time (the PCRE_DOTALL option was changed this way some time ago: version
317        7.7 change 16). This has made it possible to abolish the OP_OPT op code,
318        which was always a bit of a fudge. It also means that there is one less
319        argument for the match() function, which reduces its stack requirements
320        slightly. This change also fixes an incompatibility with Perl: the pattern
321        (?i:([^b]))(?1) should not match "ab", but previously PCRE gave a match.
323    10. More internal refactoring has drastically reduced the number of recursive
324        calls to match() for possessively repeated groups such as (abc)++ when
325        using pcre_exec().
327    11. While implementing 10, a number of bugs in the handling of groups were
328        discovered and fixed:
330        (?<=(a)+) was not diagnosed as invalid (non-fixed-length lookbehind).
331        (a|)*(?1) gave a compile-time internal error.
332        ((a|)+)+  did not notice that the outer group could match an empty string.
333        (^a|^)+   was not marked as anchored.
334        (.*a|.*)+ was not marked as matching at start or after a newline.
336    12. Yet more internal refactoring has removed another argument from the match()
337        function. Special calls to this function are now indicated by setting a
338        value in a variable in the "match data" data block.
340    13. Be more explicit in pcre_study() instead of relying on "default" for
341        opcodes that mean there is no starting character; this means that when new
342        ones are added and accidentally left out of pcre_study(), testing should
343        pick them up.
345    14. The -s option of pcretest has been documented for ages as being an old
346        synonym of -m (show memory usage). I have changed it to mean "force study
347        for every regex", that is, assume /S for every regex. This is similar to -i
348        and -d etc. It's slightly incompatible, but I'm hoping nobody is still
349        using it. It makes it easier to run collections of tests with and without
350        study enabled, and thereby test pcre_study() more easily. All the standard
351        tests are now run with and without -s (but some patterns can be marked as
352        "never study" - see 20 below).
354    15. When (*ACCEPT) was used in a subpattern that was called recursively, the
355        restoration of the capturing data to the outer values was not happening
356        correctly.
358    16. If a recursively called subpattern ended with (*ACCEPT) and matched an
359        empty string, and PCRE_NOTEMPTY was set, pcre_exec() thought the whole
360        pattern had matched an empty string, and so incorrectly returned a no
361        match.
363    17. There was optimizing code for the last branch of non-capturing parentheses,
364        and also for the obeyed branch of a conditional subexpression, which used
365        tail recursion to cut down on stack usage. Unfortunately, now that there is
366        the possibility of (*THEN) occurring in these branches, tail recursion is
367        no longer possible because the return has to be checked for (*THEN). These
368        two optimizations have therefore been removed. [But see 8.20/11 above.]
370    18. If a pattern containing \R was studied, it was assumed that \R always
371        matched two bytes, thus causing the minimum subject length to be
372        incorrectly computed because \R can also match just one byte.
374    19. If a pattern containing (*ACCEPT) was studied, the minimum subject length
375        was incorrectly computed.
377    20. If /S is present twice on a test pattern in pcretest input, it now
378        *disables* studying, thereby overriding the use of -s on the command line
379        (see 14 above). This is necessary for one or two tests to keep the output
380        identical in both cases.
382    21. When (*ACCEPT) was used in an assertion that matched an empty string and
383        PCRE_NOTEMPTY was set, PCRE applied the non-empty test to the assertion.
385    22. When an atomic group that contained a capturing parenthesis was
386        successfully matched, but the branch in which it appeared failed, the
387        capturing was not being forgotten if a higher numbered group was later
388        captured. For example, /(?>(a))b|(a)c/ when matching "ac" set capturing
389        group 1 to "a", when in fact it should be unset. This applied to multi-
390        branched capturing and non-capturing groups, repeated or not, and also to
391        positive assertions (capturing in negative assertions does not happen
392        in PCRE) and also to nested atomic groups.
394    23. Add the ++ qualifier feature to pcretest, to show the remainder of the
395        subject after a captured substring, to make it easier to tell which of a
396        number of identical substrings has been captured.
398    24. The way atomic groups are processed by pcre_exec() has been changed so that
399        if they are repeated, backtracking one repetition now resets captured
400        values correctly. For example, if ((?>(a+)b)+aabab) is matched against
401        "aaaabaaabaabab" the value of captured group 2 is now correctly recorded as
402        "aaa". Previously, it would have been "a". As part of this code
403        refactoring, the way recursive calls are handled has also been changed.
405    25. If an assertion condition captured any substrings, they were not passed
406        back unless some other capturing happened later. For example, if
407        (?(?=(a))a) was matched against "a", no capturing was returned.
409    26. When studying a pattern that contained subroutine calls or assertions,
410        the code for finding the minimum length of a possible match was handling
411        direct recursions such as (xxx(?1)|yyy) but not mutual recursions (where
412        group 1 called group 2 while simultaneously a separate group 2 called group
413        1). A stack overflow occurred in this case. I have fixed this by limiting
414        the recursion depth to 10.
416    27. Updated RunTest.bat in the distribution to the version supplied by Tom
417        Fortmann. This supports explicit test numbers on the command line, and has
418        argument validation and error reporting.
420    28. An instance of \X with an unlimited repeat could fail if at any point the
421        first character it looked at was a mark character.
423    29. Some minor code refactoring concerning Unicode properties and scripts
424        should reduce the stack requirement of match() slightly.
426    30. Added the '=' option to pcretest to check the setting of unused capturing
427        slots at the end of the pattern, which are documented as being -1, but are
428        not included in the return count.
430    31. If \k was not followed by a braced, angle-bracketed, or quoted name, PCRE
431        compiled something random. Now it gives a compile-time error (as does
432        Perl).
434    32. A *MARK encountered during the processing of a positive assertion is now
435        recorded and passed back (compatible with Perl).
437    33. If --only-matching or --colour was set on a pcregrep call whose pattern
438        had alternative anchored branches, the search for a second match in a line
439        was done as if at the line start. Thus, for example, /^01|^02/ incorrectly
440        matched the line "0102" twice. The same bug affected patterns that started
441        with a backwards assertion. For example /\b01|\b02/ also matched "0102"
442        twice.
444    34. Previously, PCRE did not allow quantification of assertions. However, Perl
445        does, and because of capturing effects, quantifying parenthesized
446        assertions may at times be useful. Quantifiers are now allowed for
447        parenthesized assertions.
449    35. A minor code tidy in pcre_compile() when checking options for \R usage.
451    36. \g was being checked for fancy things in a character class, when it should
452        just be a literal "g".
454    37. PCRE was rejecting [:a[:digit:]] whereas Perl was not. It seems that the
455        appearance of a nested POSIX class supersedes an apparent external class.
456        For example, [:a[:digit:]b:] matches "a", "b", ":", or a digit. Also,
457        unescaped square brackets may also appear as part of class names. For
458        example, [:a[:abc]b:] gives unknown class "[:abc]b:]". PCRE now behaves
459        more like Perl. (But see 8.20/1 above.)
461    38. PCRE was giving an error for \N with a braced quantifier such as {1,} (this
462        was because it thought it was \N{name}, which is not supported).
464    39. Add minix to OS list not supporting the -S option in pcretest.
466    40. PCRE tries to detect cases of infinite recursion at compile time, but it
467        cannot analyze patterns in sufficient detail to catch mutual recursions
468        such as ((?1))((?2)). There is now a runtime test that gives an error if a
469        subgroup is called recursively as a subpattern for a second time at the
470        same position in the subject string. In previous releases this might have
471        been caught by the recursion limit, or it might have run out of stack.
473    41. A pattern such as /(?(R)a+|(?R)b)/ is quite safe, as the recursion can
474        happen only once. PCRE was, however incorrectly giving a compile time error
475        "recursive call could loop indefinitely" because it cannot analyze the
476        pattern in sufficient detail. The compile time test no longer happens when
477        PCRE is compiling a conditional subpattern, but actual runaway loops are
478        now caught at runtime (see 40 above).
480    42. It seems that Perl allows any characters other than a closing parenthesis
481        to be part of the NAME in (*MARK:NAME) and other backtracking verbs. PCRE
482        has been changed to be the same.
484    43. Updated configure.ac to put in more quoting round AC_LANG_PROGRAM etc. so
485        as not to get warnings when autogen.sh is called. Also changed
486        AC_PROG_LIBTOOL (deprecated) to LT_INIT (the current macro).
488    44. To help people who use pcregrep to scan files containing exceedingly long
489        lines, the following changes have been made:
491        (a) The default value of the buffer size parameter has been increased from
492            8K to 20K. (The actual buffer used is three times this size.)
494        (b) The default can be changed by ./configure --with-pcregrep-bufsize when
495            PCRE is built.
497        (c) A --buffer-size=n option has been added to pcregrep, to allow the size
498            to be set at run time.
500        (d) Numerical values in pcregrep options can be followed by K or M, for
501            example --buffer-size=50K.
503        (e) If a line being scanned overflows pcregrep's buffer, an error is now
504            given and the return code is set to 2.
506    45. Add a pointer to the latest mark to the callout data block.
508    46. The pattern /.(*F)/, when applied to "abc" with PCRE_PARTIAL_HARD, gave a
509        partial match of an empty string instead of no match. This was specific to
510        the use of ".".
512    47. The pattern /f.*/8s, when applied to "for" with PCRE_PARTIAL_HARD, gave a
513        complete match instead of a partial match. This bug was dependent on both
514        the PCRE_UTF8 and PCRE_DOTALL options being set.
516    48. For a pattern such as /\babc|\bdef/ pcre_study() was failing to set up the
517        starting byte set, because \b was not being ignored.
520    Version 8.12 15-Jan-2011
521    ------------------------
523    1.  Fixed some typos in the markup of the man pages, and wrote a script that
524        checks for such things as part of the documentation building process.
526    2.  On a big-endian 64-bit system, pcregrep did not correctly process the
527        --match-limit and --recursion-limit options (added for 8.11). In
528        particular, this made one of the standard tests fail. (The integer value
529        went into the wrong half of a long int.)
531    3.  If the --colour option was given to pcregrep with -v (invert match), it
532        did strange things, either producing crazy output, or crashing. It should,
533        of course, ignore a request for colour when reporting lines that do not
534        match.
536    4.  Another pcregrep bug caused similar problems if --colour was specified with
537        -M (multiline) and the pattern match finished with a line ending.
539    5.  In pcregrep, when a pattern that ended with a literal newline sequence was
540        matched in multiline mode, the following line was shown as part of the
541        match. This seems wrong, so I have changed it.
543    6.  Another pcregrep bug in multiline mode, when --colour was specified, caused
544        the check for further matches in the same line (so they could be coloured)
545        to overrun the end of the current line. If another match was found, it was
546        incorrectly shown (and then shown again when found in the next line).
548    7.  If pcregrep was compiled under Windows, there was a reference to the
549        function pcregrep_exit() before it was defined. I am assuming this was
550        the cause of the "error C2371: 'pcregrep_exit' : redefinition;" that was
551        reported by a user. I've moved the definition above the reference.
554    Version 8.11 10-Dec-2010
555    ------------------------
557    1.  (*THEN) was not working properly if there were untried alternatives prior
558        to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
559        backtracked to try for "b" instead of moving to the next alternative branch
560        at the same level (in this case, to look for "c"). The Perl documentation
561        is clear that when (*THEN) is backtracked onto, it goes to the "next
562        alternative in the innermost enclosing group".
564    2.  (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
565        such as   (A(*COMMIT)B(*THEN)C|D)  any failure after matching A should
566        result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
567        (*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
568        (*THEN).
570    3.  If \s appeared in a character class, it removed the VT character from
571        the class, even if it had been included by some previous item, for example
572        in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
573        of \s, but is part of the POSIX "space" class.)
575    4.  A partial match never returns an empty string (because you can always
576        match an empty string at the end of the subject); however the checking for
577        an empty string was starting at the "start of match" point. This has been
578        changed to the "earliest inspected character" point, because the returned
579        data for a partial match starts at this character. This means that, for
580        example, /(?<=abc)def/ gives a partial match for the subject "abc"
581        (previously it gave "no match").
583    5.  Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
584        of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
585        previously a full match would be given. However, setting PCRE_PARTIAL_HARD
586        has an implication that the given string is incomplete (because a partial
587        match is preferred over a full match). For this reason, these items now
588        give a partial match in this situation. [Aside: previously, the one case
589        /t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
590        match rather than a full match, which was wrong by the old rules, but is
591        now correct.]
593    6.  There was a bug in the handling of #-introduced comments, recognized when
594        PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
595        If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
596        UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
597        scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
598        but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
599        places in pcre_compile().
601    7.  Related to (6) above, when pcre_compile() was skipping #-introduced
602        comments when looking ahead for named forward references to subpatterns,
603        the only newline sequence it recognized was NL. It now handles newlines
604        according to the set newline convention.
606    8.  SunOS4 doesn't have strerror() or strtoul(); pcregrep dealt with the
607        former, but used strtoul(), whereas pcretest avoided strtoul() but did not
608        cater for a lack of strerror(). These oversights have been fixed.
610    9.  Added --match-limit and --recursion-limit to pcregrep.
612    10. Added two casts needed to build with Visual Studio when NO_RECURSE is set.
614    11. When the -o option was used, pcregrep was setting a return code of 1, even
615        when matches were found, and --line-buffered was not being honoured.
617    12. Added an optional parentheses number to the -o and --only-matching options
618        of pcregrep.
620    13. Imitating Perl's /g action for multiple matches is tricky when the pattern
621        can match an empty string. The code to do it in pcretest and pcredemo
622        needed fixing:
624        (a) When the newline convention was "crlf", pcretest got it wrong, skipping
625            only one byte after an empty string match just before CRLF (this case
626            just got forgotten; "any" and "anycrlf" were OK).
628        (b) The pcretest code also had a bug, causing it to loop forever in UTF-8
629            mode when an empty string match preceded an ASCII character followed by
630            a non-ASCII character. (The code for advancing by one character rather
631            than one byte was nonsense.)
633        (c) The pcredemo.c sample program did not have any code at all to handle
634            the cases when CRLF is a valid newline sequence.
636    14. Neither pcre_exec() nor pcre_dfa_exec() was checking that the value given
637        as a starting offset was within the subject string. There is now a new
638        error, PCRE_ERROR_BADOFFSET, which is returned if the starting offset is
639        negative or greater than the length of the string. In order to test this,
640        pcretest is extended to allow the setting of negative starting offsets.
642    15. In both pcre_exec() and pcre_dfa_exec() the code for checking that the
643        starting offset points to the beginning of a UTF-8 character was
644        unnecessarily clumsy. I tidied it up.
646    16. Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
647        bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
649    17. Nobody had reported that the --include_dir option, which was added in
650        release 7.7 should have been called --include-dir (hyphen, not underscore)
651        for compatibility with GNU grep. I have changed it to --include-dir, but
652        left --include_dir as an undocumented synonym, and the same for
653        --exclude-dir, though that is not available in GNU grep, at least as of
654        release 2.5.4.
656    18. At a user's suggestion, the macros GETCHAR and friends (which pick up UTF-8
657        characters from a string of bytes) have been redefined so as not to use
658        loops, in order to improve performance in some environments. At the same
659        time, I abstracted some of the common code into auxiliary macros to save
660        repetition (this should not affect the compiled code).
662    19. If \c was followed by a multibyte UTF-8 character, bad things happened. A
663        compile-time error is now given if \c is not followed by an ASCII
664        character, that is, a byte less than 128. (In EBCDIC mode, the code is
665        different, and any byte value is allowed.)
667    20. Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
668        START_OPTIMIZE option, which is now allowed at compile time - but just
669        passed through to pcre_exec() or pcre_dfa_exec(). This makes it available
670        to pcregrep and other applications that have no direct access to PCRE
671        options. The new /Y option in pcretest sets this option when calling
672        pcre_compile().
674    21. Change 18 of release 8.01 broke the use of named subpatterns for recursive
675        back references. Groups containing recursive back references were forced to
676        be atomic by that change, but in the case of named groups, the amount of
677        memory required was incorrectly computed, leading to "Failed: internal
678        error: code overflow". This has been fixed.
680    22. Some patches to pcre_stringpiece.h, pcre_stringpiece_unittest.cc, and
681        pcretest.c, to avoid build problems in some Borland environments.
684    Version 8.10 25-Jun-2010
685    ------------------------
687    1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
688        THEN.
690    2.  (*ACCEPT) was not working when inside an atomic group.
692    3.  Inside a character class, \B is treated as a literal by default, but
693        faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
694        causes the error). The code is unchanged, but I tidied the documentation.
696    4.  Inside a character class, PCRE always treated \R and \X as literals,
697        whereas Perl faults them if its -w option is set. I have changed PCRE so
698        that it faults them when PCRE_EXTRA is set.
700    5.  Added support for \N, which always matches any character other than
701        newline. (It is the same as "." when PCRE_DOTALL is not set.)
703    6.  When compiling pcregrep with newer versions of gcc which may have
704        FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
705        declared with attribute warn_unused_result" were given. Just casting the
706        result to (void) does not stop the warnings; a more elaborate fudge is
707        needed. I've used a macro to implement this.
709    7.  Minor change to pcretest.c to avoid a compiler warning.
711    8.  Added four artifical Unicode properties to help with an option to make
712        \s etc use properties (see next item). The new properties are: Xan
713        (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
715    9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
716        use Unicode properties. (*UCP) at the start of a pattern can be used to set
717        this option. Modified pcretest to add /W to test this facility. Added
718        REG_UCP to make it available via the POSIX interface.
720    10. Added --line-buffered to pcregrep.
722    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
723        studied, and the match started with a letter with a code point greater than
724        127 whose first byte was different to the first byte of the other case of
725        the letter, the other case of this starting letter was not recognized
726        (#976).
728    12. If a pattern that was studied started with a repeated Unicode property
729        test, for example, \p{Nd}+, there was the theoretical possibility of
730        setting up an incorrect bitmap of starting bytes, but fortunately it could
731        not have actually happened in practice until change 8 above was made (it
732        added property types that matched character-matching opcodes).
734    13. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
735        possible starting bytes for non-anchored patterns.
737    14. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes
738        \R, and also a number of cases that involve Unicode properties, both
739        explicit and implicit when PCRE_UCP is set.
741    15. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
742        input, it could crash or give wrong results if characters with values
743        greater than 0xc0 were present in the subject string. (Detail: it assumed
744        UTF-8 input when processing these items.)
746    16. Added a lot of (int) casts to avoid compiler warnings in systems where
747        size_t is 64-bit (#991).
749    17. Added a check for running out of memory when PCRE is compiled with
750        --disable-stack-for-recursion (#990).
752    18. If the last data line in a file for pcretest does not have a newline on
753        the end, a newline was missing in the output.
755    19. The default pcre_chartables.c file recognizes only ASCII characters (values
756        less than 128) in its various bitmaps. However, there is a facility for
757        generating tables according to the current locale when PCRE is compiled. It
758        turns out that in some environments, 0x85 and 0xa0, which are Unicode space
759        characters, are recognized by isspace() and therefore were getting set in
760        these tables, and indeed these tables seem to approximate to ISO 8859. This
761        caused a problem in UTF-8 mode when pcre_study() was used to create a list
762        of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
763        which of course cannot start UTF-8 characters. I have changed the code so
764        that only real ASCII characters (less than 128) and the correct starting
765        bytes for UTF-8 encodings are set for characters greater than 127 when in
766        UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
767        altogether.)
769    20. Added the /T option to pcretest so as to be able to run tests with non-
770        standard character tables, thus making it possible to include the tests
771        used for 19 above in the standard set of tests.
773    21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
774        reference to a subpattern the other side of a comment that contains an
775        opening parenthesis caused either an internal compiling error, or a
776        reference to the wrong subpattern.
779    Version 8.02 19-Mar-2010
780  ------------------------  ------------------------
782  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.

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