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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 8.10 03 May-2010  Version 8.21
5    ------------
7    1.  Updating the JIT compiler.
9    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
10        are added as well.
12    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
13        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
14        calling _pcre_jit_exec. Some extra comments are added.
16    4.  Mark settings inside atomic groups that do not contain any capturing
17        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
18        was introduced by change 18 for 8.20.
20    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
21        ECMA-262 standard.
23    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
24        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
25        This bug was probably introduced by change 9 of 8.13.
27    7.  While fixing 6 above, I noticed that a number of other items were being
28        incorrectly rejected as "not fixed length". This arose partly because newer
29        opcodes had not been added to the fixed-length checking code. I have (a)
30        corrected the bug and added tests for these items, and (b) arranged for an
31        error to occur if an unknown opcode is encountered while checking for fixed
32        length instead of just assuming "not fixed length". The items that were
33        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
34        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
35        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
37    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
38        being incorrectly compiled and would have given unpredicatble results.
40    9.  A possessively repeated subpattern with minimum repeat count greater than
41        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
42        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
43        the first (A) could occur when it should not.
45    10. Add a cast and remove a redundant test from the code.
47    11. JIT should use pcre_malloc/pcre_free for allocation.
49    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
50        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
51        is anything other than /usr, -L is still shown).
53    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
55    14. Perl does not support \N without a following name in a [] class; PCRE now
56        also gives an error.
59    Version 8.20 21-Oct-2011
60    ------------------------
62    1.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had
63        a POSIX class. After further experiments with Perl, which convinced me that
64        Perl has bugs and confusions, a closing square bracket is no longer allowed
65        in a POSIX name. This bug also affected patterns with classes that started
66        with full stops.
68    2.  If a pattern such as /(a)b|ac/ is matched against "ac", there is no
69        captured substring, but while checking the failing first alternative,
70        substring 1 is temporarily captured. If the output vector supplied to
71        pcre_exec() was not big enough for this capture, the yield of the function
72        was still zero ("insufficient space for captured substrings"). This cannot
73        be totally fixed without adding another stack variable, which seems a lot
74        of expense for a edge case. However, I have improved the situation in cases
75        such as /(a)(b)x|abc/ matched against "abc", where the return code
76        indicates that fewer than the maximum number of slots in the ovector have
77        been set.
79    3.  Related to (2) above: when there are more back references in a pattern than
80        slots in the output vector, pcre_exec() uses temporary memory during
81        matching, and copies in the captures as far as possible afterwards. It was
82        using the entire output vector, but this conflicts with the specification
83        that only 2/3 is used for passing back captured substrings. Now it uses
84        only the first 2/3, for compatibility. This is, of course, another edge
85        case.
87    4.  Zoltan Herczeg's just-in-time compiler support has been integrated into the
88        main code base, and can be used by building with --enable-jit. When this is
89        done, pcregrep automatically uses it unless --disable-pcregrep-jit or the
90        runtime --no-jit option is given.
92    5.  When the number of matches in a pcre_dfa_exec() run exactly filled the
93        ovector, the return from the function was zero, implying that there were
94        other matches that did not fit. The correct "exactly full" value is now
95        returned.
97    6.  If a subpattern that was called recursively or as a subroutine contained
98        (*PRUNE) or any other control that caused it to give a non-standard return,
99        invalid errors such as "Error -26 (nested recursion at the same subject
100        position)" or even infinite loops could occur.
102    7.  If a pattern such as /a(*SKIP)c|b(*ACCEPT)|/ was studied, it stopped
103        computing the minimum length on reaching *ACCEPT, and so ended up with the
104        wrong value of 1 rather than 0. Further investigation indicates that
105        computing a minimum subject length in the presence of *ACCEPT is difficult
106        (think back references, subroutine calls), and so I have changed the code
107        so that no minimum is registered for a pattern that contains *ACCEPT.
109    8.  If (*THEN) was present in the first (true) branch of a conditional group,
110        it was not handled as intended. [But see 16 below.]
112    9.  Replaced RunTest.bat and CMakeLists.txt with improved versions provided by
113        Sheri Pierce.
115    10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that
116        the first byte in a match must be "a".
118    11. Change 17 for 8.13 increased the recursion depth for patterns like
119        /a(?:.)*?a/ drastically. I've improved things by remembering whether a
120        pattern contains any instances of (*THEN). If it does not, the old
121        optimizations are restored. It would be nice to do this on a per-group
122        basis, but at the moment that is not feasible.
124    12. In some environments, the output of pcretest -C is CRLF terminated. This
125        broke RunTest's code that checks for the link size. A single white space
126        character after the value is now allowed for.
128    13. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".
129        For "fr", it uses the Windows-specific input and output files.
131    14. If (*THEN) appeared in a group that was called recursively or as a
132        subroutine, it did not work as intended. [But see next item.]
134    15. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex
135        pattern fragments (but not containing any | characters). If A and B are
136        matched, but there is a failure in C so that it backtracks to (*THEN), PCRE
137        was behaving differently to Perl. PCRE backtracked into A, but Perl goes to
138        D. In other words, Perl considers parentheses that do not contain any |
139        characters to be part of a surrounding alternative, whereas PCRE was
140        treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles
141        differently. PCRE now behaves in the same way as Perl, except in the case
142        of subroutine/recursion calls such as (?1) which have in any case always
143        been different (but PCRE had them first :-).
145    16. Related to 15 above: Perl does not treat the | in a conditional group as
146        creating alternatives. Such a group is treated in the same way as an
147        ordinary group without any | characters when processing (*THEN). PCRE has
148        been changed to match Perl's behaviour.
150    17. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the
151        RunGrepTest script failed.
153    18. Change 22 for version 13 caused atomic groups to use more stack. This is
154        inevitable for groups that contain captures, but it can lead to a lot of
155        stack use in large patterns. The old behaviour has been restored for atomic
156        groups that do not contain any capturing parentheses.
158    19. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not
159        suppress the check for a minimum subject length at run time. (If it was
160        given to pcre_exec() or pcre_dfa_exec() it did work.)
162    20. Fixed an ASCII-dependent infelicity in pcretest that would have made it
163        fail to work when decoding hex characters in data strings in EBCDIC
164        environments.
166    21. It appears that in at least one Mac OS environment, the isxdigit() function
167        is implemented as a macro that evaluates to its argument more than once,
168        contravening the C 90 Standard (I haven't checked a later standard). There
169        was an instance in pcretest which caused it to go wrong when processing
170        \x{...} escapes in subject strings. The has been rewritten to avoid using
171        things like p++ in the argument of isxdigit().
174    Version 8.13 16-Aug-2011
175    ------------------------
177    1.  The Unicode data tables have been updated to Unicode 6.0.0.
179    2.  Two minor typos in pcre_internal.h have been fixed.
181    3.  Added #include <string.h> to pcre_scanner_unittest.cc, pcrecpp.cc, and
182        pcrecpp_unittest.cc. They are needed for strcmp(), memset(), and strchr()
183        in some environments (e.g. Solaris 10/SPARC using Sun Studio 12U2).
185    4.  There were a number of related bugs in the code for matching backrefences
186        caselessly in UTF-8 mode when codes for the characters concerned were
187        different numbers of bytes. For example, U+023A and U+2C65 are an upper
188        and lower case pair, using 2 and 3 bytes, respectively. The main bugs were:
189        (a) A reference to 3 copies of a 2-byte code matched only 2 of a 3-byte
190        code. (b) A reference to 2 copies of a 3-byte code would not match 2 of a
191        2-byte code at the end of the subject (it thought there wasn't enough data
192        left).
194    5.  Comprehensive information about what went wrong is now returned by
195        pcre_exec() and pcre_dfa_exec() when the UTF-8 string check fails, as long
196        as the output vector has at least 2 elements. The offset of the start of
197        the failing character and a reason code are placed in the vector.
199    6.  When the UTF-8 string check fails for pcre_compile(), the offset that is
200        now returned is for the first byte of the failing character, instead of the
201        last byte inspected. This is an incompatible change, but I hope it is small
202        enough not to be a problem. It makes the returned offset consistent with
203        pcre_exec() and pcre_dfa_exec().
205    7.  pcretest now gives a text phrase as well as the error number when
206        pcre_exec() or pcre_dfa_exec() fails; if the error is a UTF-8 check
207        failure, the offset and reason code are output.
209    8.  When \R was used with a maximizing quantifier it failed to skip backwards
210        over a \r\n pair if the subsequent match failed. Instead, it just skipped
211        back over a single character (\n). This seems wrong (because it treated the
212        two characters as a single entity when going forwards), conflicts with the
213        documentation that \R is equivalent to (?>\r\n|\n|...etc), and makes the
214        behaviour of \R* different to (\R)*, which also seems wrong. The behaviour
215        has been changed.
217    9.  Some internal refactoring has changed the processing so that the handling
218        of the PCRE_CASELESS and PCRE_MULTILINE options is done entirely at compile
219        time (the PCRE_DOTALL option was changed this way some time ago: version
220        7.7 change 16). This has made it possible to abolish the OP_OPT op code,
221        which was always a bit of a fudge. It also means that there is one less
222        argument for the match() function, which reduces its stack requirements
223        slightly. This change also fixes an incompatibility with Perl: the pattern
224        (?i:([^b]))(?1) should not match "ab", but previously PCRE gave a match.
226    10. More internal refactoring has drastically reduced the number of recursive
227        calls to match() for possessively repeated groups such as (abc)++ when
228        using pcre_exec().
230    11. While implementing 10, a number of bugs in the handling of groups were
231        discovered and fixed:
233        (?<=(a)+) was not diagnosed as invalid (non-fixed-length lookbehind).
234        (a|)*(?1) gave a compile-time internal error.
235        ((a|)+)+  did not notice that the outer group could match an empty string.
236        (^a|^)+   was not marked as anchored.
237        (.*a|.*)+ was not marked as matching at start or after a newline.
239    12. Yet more internal refactoring has removed another argument from the match()
240        function. Special calls to this function are now indicated by setting a
241        value in a variable in the "match data" data block.
243    13. Be more explicit in pcre_study() instead of relying on "default" for
244        opcodes that mean there is no starting character; this means that when new
245        ones are added and accidentally left out of pcre_study(), testing should
246        pick them up.
248    14. The -s option of pcretest has been documented for ages as being an old
249        synonym of -m (show memory usage). I have changed it to mean "force study
250        for every regex", that is, assume /S for every regex. This is similar to -i
251        and -d etc. It's slightly incompatible, but I'm hoping nobody is still
252        using it. It makes it easier to run collections of tests with and without
253        study enabled, and thereby test pcre_study() more easily. All the standard
254        tests are now run with and without -s (but some patterns can be marked as
255        "never study" - see 20 below).
257    15. When (*ACCEPT) was used in a subpattern that was called recursively, the
258        restoration of the capturing data to the outer values was not happening
259        correctly.
261    16. If a recursively called subpattern ended with (*ACCEPT) and matched an
262        empty string, and PCRE_NOTEMPTY was set, pcre_exec() thought the whole
263        pattern had matched an empty string, and so incorrectly returned a no
264        match.
266    17. There was optimizing code for the last branch of non-capturing parentheses,
267        and also for the obeyed branch of a conditional subexpression, which used
268        tail recursion to cut down on stack usage. Unfortunately, now that there is
269        the possibility of (*THEN) occurring in these branches, tail recursion is
270        no longer possible because the return has to be checked for (*THEN). These
271        two optimizations have therefore been removed. [But see 8.20/11 above.]
273    18. If a pattern containing \R was studied, it was assumed that \R always
274        matched two bytes, thus causing the minimum subject length to be
275        incorrectly computed because \R can also match just one byte.
277    19. If a pattern containing (*ACCEPT) was studied, the minimum subject length
278        was incorrectly computed.
280    20. If /S is present twice on a test pattern in pcretest input, it now
281        *disables* studying, thereby overriding the use of -s on the command line
282        (see 14 above). This is necessary for one or two tests to keep the output
283        identical in both cases.
285    21. When (*ACCEPT) was used in an assertion that matched an empty string and
286        PCRE_NOTEMPTY was set, PCRE applied the non-empty test to the assertion.
288    22. When an atomic group that contained a capturing parenthesis was
289        successfully matched, but the branch in which it appeared failed, the
290        capturing was not being forgotten if a higher numbered group was later
291        captured. For example, /(?>(a))b|(a)c/ when matching "ac" set capturing
292        group 1 to "a", when in fact it should be unset. This applied to multi-
293        branched capturing and non-capturing groups, repeated or not, and also to
294        positive assertions (capturing in negative assertions does not happen
295        in PCRE) and also to nested atomic groups.
297    23. Add the ++ qualifier feature to pcretest, to show the remainder of the
298        subject after a captured substring, to make it easier to tell which of a
299        number of identical substrings has been captured.
301    24. The way atomic groups are processed by pcre_exec() has been changed so that
302        if they are repeated, backtracking one repetition now resets captured
303        values correctly. For example, if ((?>(a+)b)+aabab) is matched against
304        "aaaabaaabaabab" the value of captured group 2 is now correctly recorded as
305        "aaa". Previously, it would have been "a". As part of this code
306        refactoring, the way recursive calls are handled has also been changed.
308    25. If an assertion condition captured any substrings, they were not passed
309        back unless some other capturing happened later. For example, if
310        (?(?=(a))a) was matched against "a", no capturing was returned.
312    26. When studying a pattern that contained subroutine calls or assertions,
313        the code for finding the minimum length of a possible match was handling
314        direct recursions such as (xxx(?1)|yyy) but not mutual recursions (where
315        group 1 called group 2 while simultaneously a separate group 2 called group
316        1). A stack overflow occurred in this case. I have fixed this by limiting
317        the recursion depth to 10.
319    27. Updated RunTest.bat in the distribution to the version supplied by Tom
320        Fortmann. This supports explicit test numbers on the command line, and has
321        argument validation and error reporting.
323    28. An instance of \X with an unlimited repeat could fail if at any point the
324        first character it looked at was a mark character.
326    29. Some minor code refactoring concerning Unicode properties and scripts
327        should reduce the stack requirement of match() slightly.
329    30. Added the '=' option to pcretest to check the setting of unused capturing
330        slots at the end of the pattern, which are documented as being -1, but are
331        not included in the return count.
333    31. If \k was not followed by a braced, angle-bracketed, or quoted name, PCRE
334        compiled something random. Now it gives a compile-time error (as does
335        Perl).
337    32. A *MARK encountered during the processing of a positive assertion is now
338        recorded and passed back (compatible with Perl).
340    33. If --only-matching or --colour was set on a pcregrep call whose pattern
341        had alternative anchored branches, the search for a second match in a line
342        was done as if at the line start. Thus, for example, /^01|^02/ incorrectly
343        matched the line "0102" twice. The same bug affected patterns that started
344        with a backwards assertion. For example /\b01|\b02/ also matched "0102"
345        twice.
347    34. Previously, PCRE did not allow quantification of assertions. However, Perl
348        does, and because of capturing effects, quantifying parenthesized
349        assertions may at times be useful. Quantifiers are now allowed for
350        parenthesized assertions.
352    35. A minor code tidy in pcre_compile() when checking options for \R usage.
354    36. \g was being checked for fancy things in a character class, when it should
355        just be a literal "g".
357    37. PCRE was rejecting [:a[:digit:]] whereas Perl was not. It seems that the
358        appearance of a nested POSIX class supersedes an apparent external class.
359        For example, [:a[:digit:]b:] matches "a", "b", ":", or a digit. Also,
360        unescaped square brackets may also appear as part of class names. For
361        example, [:a[:abc]b:] gives unknown class "[:abc]b:]". PCRE now behaves
362        more like Perl. (But see 8.20/1 above.)
364    38. PCRE was giving an error for \N with a braced quantifier such as {1,} (this
365        was because it thought it was \N{name}, which is not supported).
367    39. Add minix to OS list not supporting the -S option in pcretest.
369    40. PCRE tries to detect cases of infinite recursion at compile time, but it
370        cannot analyze patterns in sufficient detail to catch mutual recursions
371        such as ((?1))((?2)). There is now a runtime test that gives an error if a
372        subgroup is called recursively as a subpattern for a second time at the
373        same position in the subject string. In previous releases this might have
374        been caught by the recursion limit, or it might have run out of stack.
376    41. A pattern such as /(?(R)a+|(?R)b)/ is quite safe, as the recursion can
377        happen only once. PCRE was, however incorrectly giving a compile time error
378        "recursive call could loop indefinitely" because it cannot analyze the
379        pattern in sufficient detail. The compile time test no longer happens when
380        PCRE is compiling a conditional subpattern, but actual runaway loops are
381        now caught at runtime (see 40 above).
383    42. It seems that Perl allows any characters other than a closing parenthesis
384        to be part of the NAME in (*MARK:NAME) and other backtracking verbs. PCRE
385        has been changed to be the same.
387    43. Updated configure.ac to put in more quoting round AC_LANG_PROGRAM etc. so
388        as not to get warnings when autogen.sh is called. Also changed
389        AC_PROG_LIBTOOL (deprecated) to LT_INIT (the current macro).
391    44. To help people who use pcregrep to scan files containing exceedingly long
392        lines, the following changes have been made:
394        (a) The default value of the buffer size parameter has been increased from
395            8K to 20K. (The actual buffer used is three times this size.)
397        (b) The default can be changed by ./configure --with-pcregrep-bufsize when
398            PCRE is built.
400        (c) A --buffer-size=n option has been added to pcregrep, to allow the size
401            to be set at run time.
403        (d) Numerical values in pcregrep options can be followed by K or M, for
404            example --buffer-size=50K.
406        (e) If a line being scanned overflows pcregrep's buffer, an error is now
407            given and the return code is set to 2.
409    45. Add a pointer to the latest mark to the callout data block.
411    46. The pattern /.(*F)/, when applied to "abc" with PCRE_PARTIAL_HARD, gave a
412        partial match of an empty string instead of no match. This was specific to
413        the use of ".".
415    47. The pattern /f.*/8s, when applied to "for" with PCRE_PARTIAL_HARD, gave a
416        complete match instead of a partial match. This bug was dependent on both
417        the PCRE_UTF8 and PCRE_DOTALL options being set.
419    48. For a pattern such as /\babc|\bdef/ pcre_study() was failing to set up the
420        starting byte set, because \b was not being ignored.
423    Version 8.12 15-Jan-2011
424    ------------------------
426    1.  Fixed some typos in the markup of the man pages, and wrote a script that
427        checks for such things as part of the documentation building process.
429    2.  On a big-endian 64-bit system, pcregrep did not correctly process the
430        --match-limit and --recursion-limit options (added for 8.11). In
431        particular, this made one of the standard tests fail. (The integer value
432        went into the wrong half of a long int.)
434    3.  If the --colour option was given to pcregrep with -v (invert match), it
435        did strange things, either producing crazy output, or crashing. It should,
436        of course, ignore a request for colour when reporting lines that do not
437        match.
439    4.  Another pcregrep bug caused similar problems if --colour was specified with
440        -M (multiline) and the pattern match finished with a line ending.
442    5.  In pcregrep, when a pattern that ended with a literal newline sequence was
443        matched in multiline mode, the following line was shown as part of the
444        match. This seems wrong, so I have changed it.
446    6.  Another pcregrep bug in multiline mode, when --colour was specified, caused
447        the check for further matches in the same line (so they could be coloured)
448        to overrun the end of the current line. If another match was found, it was
449        incorrectly shown (and then shown again when found in the next line).
451    7.  If pcregrep was compiled under Windows, there was a reference to the
452        function pcregrep_exit() before it was defined. I am assuming this was
453        the cause of the "error C2371: 'pcregrep_exit' : redefinition;" that was
454        reported by a user. I've moved the definition above the reference.
457    Version 8.11 10-Dec-2010
458    ------------------------
460    1.  (*THEN) was not working properly if there were untried alternatives prior
461        to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
462        backtracked to try for "b" instead of moving to the next alternative branch
463        at the same level (in this case, to look for "c"). The Perl documentation
464        is clear that when (*THEN) is backtracked onto, it goes to the "next
465        alternative in the innermost enclosing group".
467    2.  (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
468        such as   (A(*COMMIT)B(*THEN)C|D)  any failure after matching A should
469        result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
470        (*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
471        (*THEN).
473    3.  If \s appeared in a character class, it removed the VT character from
474        the class, even if it had been included by some previous item, for example
475        in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
476        of \s, but is part of the POSIX "space" class.)
478    4.  A partial match never returns an empty string (because you can always
479        match an empty string at the end of the subject); however the checking for
480        an empty string was starting at the "start of match" point. This has been
481        changed to the "earliest inspected character" point, because the returned
482        data for a partial match starts at this character. This means that, for
483        example, /(?<=abc)def/ gives a partial match for the subject "abc"
484        (previously it gave "no match").
486    5.  Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
487        of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
488        previously a full match would be given. However, setting PCRE_PARTIAL_HARD
489        has an implication that the given string is incomplete (because a partial
490        match is preferred over a full match). For this reason, these items now
491        give a partial match in this situation. [Aside: previously, the one case
492        /t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
493        match rather than a full match, which was wrong by the old rules, but is
494        now correct.]
496    6.  There was a bug in the handling of #-introduced comments, recognized when
497        PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
498        If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
499        UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
500        scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
501        but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
502        places in pcre_compile().
504    7.  Related to (6) above, when pcre_compile() was skipping #-introduced
505        comments when looking ahead for named forward references to subpatterns,
506        the only newline sequence it recognized was NL. It now handles newlines
507        according to the set newline convention.
509    8.  SunOS4 doesn't have strerror() or strtoul(); pcregrep dealt with the
510        former, but used strtoul(), whereas pcretest avoided strtoul() but did not
511        cater for a lack of strerror(). These oversights have been fixed.
513    9.  Added --match-limit and --recursion-limit to pcregrep.
515    10. Added two casts needed to build with Visual Studio when NO_RECURSE is set.
517    11. When the -o option was used, pcregrep was setting a return code of 1, even
518        when matches were found, and --line-buffered was not being honoured.
520    12. Added an optional parentheses number to the -o and --only-matching options
521        of pcregrep.
523    13. Imitating Perl's /g action for multiple matches is tricky when the pattern
524        can match an empty string. The code to do it in pcretest and pcredemo
525        needed fixing:
527        (a) When the newline convention was "crlf", pcretest got it wrong, skipping
528            only one byte after an empty string match just before CRLF (this case
529            just got forgotten; "any" and "anycrlf" were OK).
531        (b) The pcretest code also had a bug, causing it to loop forever in UTF-8
532            mode when an empty string match preceded an ASCII character followed by
533            a non-ASCII character. (The code for advancing by one character rather
534            than one byte was nonsense.)
536        (c) The pcredemo.c sample program did not have any code at all to handle
537            the cases when CRLF is a valid newline sequence.
539    14. Neither pcre_exec() nor pcre_dfa_exec() was checking that the value given
540        as a starting offset was within the subject string. There is now a new
541        error, PCRE_ERROR_BADOFFSET, which is returned if the starting offset is
542        negative or greater than the length of the string. In order to test this,
543        pcretest is extended to allow the setting of negative starting offsets.
545    15. In both pcre_exec() and pcre_dfa_exec() the code for checking that the
546        starting offset points to the beginning of a UTF-8 character was
547        unnecessarily clumsy. I tidied it up.
549    16. Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
550        bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
552    17. Nobody had reported that the --include_dir option, which was added in
553        release 7.7 should have been called --include-dir (hyphen, not underscore)
554        for compatibility with GNU grep. I have changed it to --include-dir, but
555        left --include_dir as an undocumented synonym, and the same for
556        --exclude-dir, though that is not available in GNU grep, at least as of
557        release 2.5.4.
559    18. At a user's suggestion, the macros GETCHAR and friends (which pick up UTF-8
560        characters from a string of bytes) have been redefined so as not to use
561        loops, in order to improve performance in some environments. At the same
562        time, I abstracted some of the common code into auxiliary macros to save
563        repetition (this should not affect the compiled code).
565    19. If \c was followed by a multibyte UTF-8 character, bad things happened. A
566        compile-time error is now given if \c is not followed by an ASCII
567        character, that is, a byte less than 128. (In EBCDIC mode, the code is
568        different, and any byte value is allowed.)
570    20. Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
571        START_OPTIMIZE option, which is now allowed at compile time - but just
572        passed through to pcre_exec() or pcre_dfa_exec(). This makes it available
573        to pcregrep and other applications that have no direct access to PCRE
574        options. The new /Y option in pcretest sets this option when calling
575        pcre_compile().
577    21. Change 18 of release 8.01 broke the use of named subpatterns for recursive
578        back references. Groups containing recursive back references were forced to
579        be atomic by that change, but in the case of named groups, the amount of
580        memory required was incorrectly computed, leading to "Failed: internal
581        error: code overflow". This has been fixed.
583    22. Some patches to pcre_stringpiece.h, pcre_stringpiece_unittest.cc, and
584        pcretest.c, to avoid build problems in some Borland environments.
587    Version 8.10 25-Jun-2010
588  ------------------------  ------------------------
590  1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and  1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
# Line 9  Version 8.10 03 May-2010 Line 592  Version 8.10 03 May-2010
593  2.  (*ACCEPT) was not working when inside an atomic group.  2.  (*ACCEPT) was not working when inside an atomic group.
595  3.  Inside a character class, \B is treated as a literal by default, but  3.  Inside a character class, \B is treated as a literal by default, but
596      faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option      faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
597      causes the error). The code is unchanged, but I tidied the documentation.      causes the error). The code is unchanged, but I tidied the documentation.
599  4.  Inside a character class, PCRE always treated \R and \X as literals,  4.  Inside a character class, PCRE always treated \R and \X as literals,
600      whereas Perl faults them if its -w option is set. I have changed PCRE so      whereas Perl faults them if its -w option is set. I have changed PCRE so
601      that it faults them when PCRE_EXTRA is set.      that it faults them when PCRE_EXTRA is set.
603  5.  Added support for \N, which always matches any character other than  5.  Added support for \N, which always matches any character other than
604      newline. (It is the same as "." when PCRE_DOTALL is not set.)      newline. (It is the same as "." when PCRE_DOTALL is not set.)
606  6.  When compiling pcregrep with newer versions of gcc which may have  6.  When compiling pcregrep with newer versions of gcc which may have
607      FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',      FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
608      declared with attribute warn_unused_result" were given. Just casting the      declared with attribute warn_unused_result" were given. Just casting the
609      result to (void) does not stop the warnings; a more elaborate fudge is      result to (void) does not stop the warnings; a more elaborate fudge is
610      needed. I've used a macro to implement this.      needed. I've used a macro to implement this.
612  7.  Minor change to pcretest.c to avoid a compiler warning.  7.  Minor change to pcretest.c to avoid a compiler warning.
614  8.  Added four artifical Unicode properties to help with an option to make  8.  Added four artifical Unicode properties to help with an option to make
615      \s etc use properties (see next item). The new properties are: Xan      \s etc use properties (see next item). The new properties are: Xan
616      (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).      (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
618  9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes  9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
619      use Unicode properties. (*UCP) at the start of a pattern can be used to set      use Unicode properties. (*UCP) at the start of a pattern can be used to set
620      this option. Modified pcretest to add /W to test this facility. Added      this option. Modified pcretest to add /W to test this facility. Added
621      REG_UCP to make it available via the POSIX interface.      REG_UCP to make it available via the POSIX interface.
 10. Added --line-buffered to pcregrep.  
623  11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was  10. Added --line-buffered to pcregrep.
624      studied, and the match started with a letter with a code point greater than  
625    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
626        studied, and the match started with a letter with a code point greater than
627      127 whose first byte was different to the first byte of the other case of      127 whose first byte was different to the first byte of the other case of
628      the letter, the other case of this starting letter was not recognized.      the letter, the other case of this starting letter was not recognized
629        (#976).
630  12. pcreposix.c included pcre.h before including pcre_internal.h. This caused a  
631      conflict in the definition of PCRE_EXP_DECL. I have removed the include of  12. If a pattern that was studied started with a repeated Unicode property
     pcre.h as pcre_internal.h includes pcre.h itself. (This may be a bit of  
     historical tidying that never got done.)  
 13. If a pattern that was studied started with a repeated Unicode property  
632      test, for example, \p{Nd}+, there was the theoretical possibility of      test, for example, \p{Nd}+, there was the theoretical possibility of
633      setting up an incorrect bitmap of starting bytes, but fortunately it could      setting up an incorrect bitmap of starting bytes, but fortunately it could
634      not have actually happened in practice until change 8 above was made (it      not have actually happened in practice until change 8 above was made (it
635      added property types that matched character-matching opcodes).      added property types that matched character-matching opcodes).
637  14. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of  13. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
638      possible starting bytes for non-anchored patterns.      possible starting bytes for non-anchored patterns.
640  15. The "auto-possessify" feature of pcre_compile() now recognizes \R.  14. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes
641        \R, and also a number of cases that involve Unicode properties, both
642        explicit and implicit when PCRE_UCP is set.
644    15. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
645        input, it could crash or give wrong results if characters with values
646        greater than 0xc0 were present in the subject string. (Detail: it assumed
647        UTF-8 input when processing these items.)
649    16. Added a lot of (int) casts to avoid compiler warnings in systems where
650        size_t is 64-bit (#991).
652    17. Added a check for running out of memory when PCRE is compiled with
653        --disable-stack-for-recursion (#990).
655    18. If the last data line in a file for pcretest does not have a newline on
656        the end, a newline was missing in the output.
658    19. The default pcre_chartables.c file recognizes only ASCII characters (values
659        less than 128) in its various bitmaps. However, there is a facility for
660        generating tables according to the current locale when PCRE is compiled. It
661        turns out that in some environments, 0x85 and 0xa0, which are Unicode space
662        characters, are recognized by isspace() and therefore were getting set in
663        these tables, and indeed these tables seem to approximate to ISO 8859. This
664        caused a problem in UTF-8 mode when pcre_study() was used to create a list
665        of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
666        which of course cannot start UTF-8 characters. I have changed the code so
667        that only real ASCII characters (less than 128) and the correct starting
668        bytes for UTF-8 encodings are set for characters greater than 127 when in
669        UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
670        altogether.)
672    20. Added the /T option to pcretest so as to be able to run tests with non-
673        standard character tables, thus making it possible to include the tests
674        used for 19 above in the standard set of tests.
676    21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
677        reference to a subpattern the other side of a comment that contains an
678        opening parenthesis caused either an internal compiling error, or a
679        reference to the wrong subpattern.
682  Version 8.02 19-Mar-2010  Version 8.02 19-Mar-2010

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