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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 7.5 12-Nov-07  Version 8.11 10-Oct-2010
5    ------------------------
7    1.  (*THEN) was not working properly if there were untried alternatives prior
8        to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
9        backtracked to try for "b" instead of moving to the next alternative branch
10        at the same level (in this case, to look for "c"). The Perl documentation
11        is clear that when (*THEN) is backtracked onto, it goes to the "next
12        alternative in the innermost enclosing group".
14    2.  (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
15        such as   (A(*COMMIT)B(*THEN)C|D)  any failure after matching A should
16        result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
17        (*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
18        (*THEN).
20    3.  If \s appeared in a character class, it removed the VT character from
21        the class, even if it had been included by some previous item, for example
22        in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
23        of \s, but is part of the POSIX "space" class.)
25    4.  A partial match never returns an empty string (because you can always
26        match an empty string at the end of the subject); however the checking for
27        an empty string was starting at the "start of match" point. This has been
28        changed to the "earliest inspected character" point, because the returned
29        data for a partial match starts at this character. This means that, for
30        example, /(?<=abc)def/ gives a partial match for the subject "abc"
31        (previously it gave "no match").
33    5.  Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
34        of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
35        previously a full match would be given. However, setting PCRE_PARTIAL_HARD
36        has an implication that the given string is incomplete (because a partial
37        match is preferred over a full match). For this reason, these items now
38        give a partial match in this situation. [Aside: previously, the one case
39        /t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
40        match rather than a full match, which was wrong by the old rules, but is
41        now correct.]
43    6.  There was a bug in the handling of #-introduced comments, recognized when
44        PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
45        If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
46        UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
47        scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
48        but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
49        places in pcre_compile().
51    7.  Related to (6) above, when pcre_compile() was skipping #-introduced
52        comments when looking ahead for named forward references to subpatterns,
53        the only newline sequence it recognized was NL. It now handles newlines
54        according to the set newline convention.
56    8.  SunOS4 doesn't have strerror() or strtoul(); pcregrep dealt with the
57        former, but used strtoul(), whereas pcretest avoided strtoul() but did not
58        cater for a lack of strerror(). These oversights have been fixed.
60    9.  Added --match-limit and --recursion-limit to pcregrep.
62    10. Added two casts needed to build with Visual Studio when NO_RECURSE is set.
64    11. When the -o option was used, pcregrep was setting a return code of 1, even
65        when matches were found, and --line-buffered was not being honoured.
67    12. Added an optional parentheses number to the -o and --only-matching options
68        of pcregrep.
70    13. Imitating Perl's /g action for multiple matches is tricky when the pattern
71        can match an empty string. The code to do it in pcretest and pcredemo
72        needed fixing:
74        (a) When the newline convention was "crlf", pcretest got it wrong, skipping
75            only one byte after an empty string match just before CRLF (this case
76            just got forgotten; "any" and "anycrlf" were OK).
78        (b) The pcretest code also had a bug, causing it to loop forever in UTF-8
79            mode when an empty string match preceded an ASCII character followed by
80            a non-ASCII character. (The code for advancing by one character rather
81            than one byte was nonsense.)
83        (c) The pcredemo.c sample program did not have any code at all to handle
84            the cases when CRLF is a valid newline sequence.
86    14. Neither pcre_exec() nor pcre_dfa_exec() was checking that the value given
87        as a starting offset was within the subject string. There is now a new
88        error, PCRE_ERROR_BADOFFSET, which is returned if the starting offset is
89        negative or greater than the length of the string. In order to test this,
90        pcretest is extended to allow the setting of negative starting offsets.
92    15. In both pcre_exec() and pcre_dfa_exec() the code for checking that the
93        starting offset points to the beginning of a UTF-8 character was
94        unnecessarily clumsy. I tidied it up.
96    16. Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
97        bad UTF-8 sequence and one that is incomplete.
99    17. Nobody had reported that the --include_dir option, which was added in
100        release 7.7 should have been called --include-dir (hyphen, not underscore)
101        for compatibility with GNU grep. I have changed it to --include-dir, but
102        left --include_dir as an undocumented synonym, and the same for
103        --exclude-dir, though that is not available in GNU grep, at least as of
104        release 2.5.4.
106    18. At a user's suggestion, the macros GETCHAR and friends (which pick up UTF-8
107        characters from a string of bytes) have been redefined so as not to use
108        loops, in order to improve performance in some environments. At the same
109        time, I abstracted some of the common code into auxiliary macros to save
110        repetition (this should not affect the compiled code).
112    19. If \c was followed by a multibyte UTF-8 character, bad things happened. A
113        compile-time error is now given if \c is not followed by an ASCII
114        character, that is, a byte less than 128. (In EBCDIC mode, the code is
115        different, and any byte value is allowed.)
117    20. Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
118        START_OPTIMIZE option, which is now allowed at compile time - but just
119        passed through to pcre_exec() or pcre_dfa_exec(). This makes it available
120        to pcregrep and other applications that have no direct access to PCRE
121        options. The new /Y option in pcretest sets this option when calling
122        pcre_compile().
125    Version 8.10 25-Jun-2010
126    ------------------------
128    1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
129        THEN.
131    2.  (*ACCEPT) was not working when inside an atomic group.
133    3.  Inside a character class, \B is treated as a literal by default, but
134        faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
135        causes the error). The code is unchanged, but I tidied the documentation.
137    4.  Inside a character class, PCRE always treated \R and \X as literals,
138        whereas Perl faults them if its -w option is set. I have changed PCRE so
139        that it faults them when PCRE_EXTRA is set.
141    5.  Added support for \N, which always matches any character other than
142        newline. (It is the same as "." when PCRE_DOTALL is not set.)
144    6.  When compiling pcregrep with newer versions of gcc which may have
145        FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
146        declared with attribute warn_unused_result" were given. Just casting the
147        result to (void) does not stop the warnings; a more elaborate fudge is
148        needed. I've used a macro to implement this.
150    7.  Minor change to pcretest.c to avoid a compiler warning.
152    8.  Added four artifical Unicode properties to help with an option to make
153        \s etc use properties (see next item). The new properties are: Xan
154        (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
156    9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
157        use Unicode properties. (*UCP) at the start of a pattern can be used to set
158        this option. Modified pcretest to add /W to test this facility. Added
159        REG_UCP to make it available via the POSIX interface.
161    10. Added --line-buffered to pcregrep.
163    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
164        studied, and the match started with a letter with a code point greater than
165        127 whose first byte was different to the first byte of the other case of
166        the letter, the other case of this starting letter was not recognized
167        (#976).
169    12. If a pattern that was studied started with a repeated Unicode property
170        test, for example, \p{Nd}+, there was the theoretical possibility of
171        setting up an incorrect bitmap of starting bytes, but fortunately it could
172        not have actually happened in practice until change 8 above was made (it
173        added property types that matched character-matching opcodes).
175    13. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
176        possible starting bytes for non-anchored patterns.
178    14. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes
179        \R, and also a number of cases that involve Unicode properties, both
180        explicit and implicit when PCRE_UCP is set.
182    15. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
183        input, it could crash or give wrong results if characters with values
184        greater than 0xc0 were present in the subject string. (Detail: it assumed
185        UTF-8 input when processing these items.)
187    16. Added a lot of (int) casts to avoid compiler warnings in systems where
188        size_t is 64-bit (#991).
190    17. Added a check for running out of memory when PCRE is compiled with
191        --disable-stack-for-recursion (#990).
193    18. If the last data line in a file for pcretest does not have a newline on
194        the end, a newline was missing in the output.
196    19. The default pcre_chartables.c file recognizes only ASCII characters (values
197        less than 128) in its various bitmaps. However, there is a facility for
198        generating tables according to the current locale when PCRE is compiled. It
199        turns out that in some environments, 0x85 and 0xa0, which are Unicode space
200        characters, are recognized by isspace() and therefore were getting set in
201        these tables, and indeed these tables seem to approximate to ISO 8859. This
202        caused a problem in UTF-8 mode when pcre_study() was used to create a list
203        of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
204        which of course cannot start UTF-8 characters. I have changed the code so
205        that only real ASCII characters (less than 128) and the correct starting
206        bytes for UTF-8 encodings are set for characters greater than 127 when in
207        UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
208        altogether.)
210    20. Added the /T option to pcretest so as to be able to run tests with non-
211        standard character tables, thus making it possible to include the tests
212        used for 19 above in the standard set of tests.
214    21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
215        reference to a subpattern the other side of a comment that contains an
216        opening parenthesis caused either an internal compiling error, or a
217        reference to the wrong subpattern.
220    Version 8.02 19-Mar-2010
221    ------------------------
223    1.  The Unicode data tables have been updated to Unicode 5.2.0.
225    2.  Added the option --libs-cpp to pcre-config, but only when C++ support is
226        configured.
228    3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the
229        original author of that file, following a query about its status.
231    4.  On systems that do not have stdint.h (e.g. Solaris), check for and include
232        inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.
234    5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
235        quantifier applied to a forward-referencing subroutine call, could compile
236        incorrect code or give the error "internal error: previously-checked
237        referenced subpattern not found".
239    6.  Both MS Visual Studio and Symbian OS have problems with initializing
240        variables to point to external functions. For these systems, therefore,
241        pcre_malloc etc. are now initialized to local functions that call the
242        relevant global functions.
244    7.  There were two entries missing in the vectors called coptable and poptable
245        in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.
246        I've fixed the data, and added a kludgy way of testing at compile time that
247        the lengths are correct (equal to the number of opcodes).
249    8.  Following on from 7, I added a similar kludge to check the length of the
250        eint vector in pcreposix.c.
252    9.  Error texts for pcre_compile() are held as one long string to avoid too
253        much relocation at load time. To find a text, the string is searched,
254        counting zeros. There was no check for running off the end of the string,
255        which could happen if a new error number was added without updating the
256        string.
258    10. \K gave a compile-time error if it appeared in a lookbehind assersion.
260    11. \K was not working if it appeared in an atomic group or in a group that
261        was called as a "subroutine", or in an assertion. Perl 5.11 documents that
262        \K is "not well defined" if used in an assertion. PCRE now accepts it if
263        the assertion is positive, but not if it is negative.
265    12. Change 11 fortuitously reduced the size of the stack frame used in the
266        "match()" function of pcre_exec.c by one pointer. Forthcoming
267        implementation of support for (*MARK) will need an extra pointer on the
268        stack; I have reserved it now, so that the stack frame size does not
269        decrease.
271    13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other
272        item in branch that calls a recursion is a subroutine call - as in the
273        second branch in the above example - was incorrectly given the compile-
274        time error "recursive call could loop indefinitely" because pcre_compile()
275        was not correctly checking the subroutine for matching a non-empty string.
277    14. The checks for overrunning compiling workspace could trigger after an
278        overrun had occurred. This is a "should never occur" error, but it can be
279        triggered by pathological patterns such as hundreds of nested parentheses.
280        The checks now trigger 100 bytes before the end of the workspace.
282    15. Fix typo in configure.ac: "srtoq" should be "strtoq".
285    Version 8.01 19-Jan-2010
286    ------------------------
288    1.  If a pattern contained a conditional subpattern with only one branch (in
289        particular, this includes all (*DEFINE) patterns), a call to pcre_study()
290        computed the wrong minimum data length (which is of course zero for such
291        subpatterns). This could cause incorrect "no match" results.
293    2.  For patterns such as (?i)a(?-i)b|c where an option setting at the start of
294        the pattern is reset in the first branch, pcre_compile() failed with
295        "internal error: code overflow at offset...". This happened only when
296        the reset was to the original external option setting. (An optimization
297        abstracts leading options settings into an external setting, which was the
298        cause of this.)
300    3.  A pattern such as ^(?!a(*SKIP)b) where a negative assertion contained one
301        of the verbs SKIP, PRUNE, or COMMIT, did not work correctly. When the
302        assertion pattern did not match (meaning that the assertion was true), it
303        was incorrectly treated as false if the SKIP had been reached during the
304        matching. This also applied to assertions used as conditions.
306    4.  If an item that is not supported by pcre_dfa_exec() was encountered in an
307        assertion subpattern, including such a pattern used as a condition,
308        unpredictable results occurred, instead of the error return
311    5.  The C++ GlobalReplace function was not working like Perl for the special
312        situation when an empty string is matched. It now does the fancy magic
313        stuff that is necessary.
315    6.  In pcre_internal.h, obsolete includes to setjmp.h and stdarg.h have been
316        removed. (These were left over from very, very early versions of PCRE.)
318    7.  Some cosmetic changes to the code to make life easier when compiling it
319        as part of something else:
321        (a) Change DEBUG to PCRE_DEBUG.
323        (b) In pcre_compile(), rename the member of the "branch_chain" structure
324            called "current" as "current_branch", to prevent a collision with the
325            Linux macro when compiled as a kernel module.
327        (c) In pcre_study(), rename the function set_bit() as set_table_bit(), to
328            prevent a collision with the Linux macro when compiled as a kernel
329            module.
331    8.  In pcre_compile() there are some checks for integer overflows that used to
332        cast potentially large values to (double). This has been changed to that
333        when building, a check for int64_t is made, and if it is found, it is used
334        instead, thus avoiding the use of floating point arithmetic. (There is no
335        other use of FP in PCRE.) If int64_t is not found, the fallback is to
336        double.
338    9.  Added two casts to avoid signed/unsigned warnings from VS Studio Express
339        2005 (difference between two addresses compared to an unsigned value).
341    10. Change the standard AC_CHECK_LIB test for libbz2 in configure.ac to a
342        custom one, because of the following reported problem in Windows:
344          - libbz2 uses the Pascal calling convention (WINAPI) for the functions
345              under Win32.
346          - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",
347              therefore missing the function definition.
348          - The compiler thus generates a "C" signature for the test function.
349          - The linker fails to find the "C" function.
350          - PCRE fails to configure if asked to do so against libbz2.
352    11. When running libtoolize from libtool-2.2.6b as part of autogen.sh, these
353        messages were output:
355          Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and
356          rerunning libtoolize, to keep the correct libtool macros in-tree.
357          Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
359        I have done both of these things.
361    12. Although pcre_dfa_exec() does not use nearly as much stack as pcre_exec()
362        most of the time, it *can* run out if it is given a pattern that contains a
363        runaway infinite recursion. I updated the discussion in the pcrestack man
364        page.
366    13. Now that we have gone to the x.xx style of version numbers, the minor
367        version may start with zero. Using 08 or 09 is a bad idea because users
368        might check the value of PCRE_MINOR in their code, and 08 or 09 may be
369        interpreted as invalid octal numbers. I've updated the previous comment in
370        configure.ac, and also added a check that gives an error if 08 or 09 are
371        used.
373    14. Change 8.00/11 was not quite complete: code had been accidentally omitted,
374        causing partial matching to fail when the end of the subject matched \W
375        in a UTF-8 pattern where \W was quantified with a minimum of 3.
377    15. There were some discrepancies between the declarations in pcre_internal.h
378        of _pcre_is_newline(), _pcre_was_newline(), and _pcre_valid_utf8() and
379        their definitions. The declarations used "const uschar *" and the
380        definitions used USPTR. Even though USPTR is normally defined as "const
381        unsigned char *" (and uschar is typedeffed as "unsigned char"), it was
382        reported that: "This difference in casting confuses some C++ compilers, for
383        example, SunCC recognizes above declarations as different functions and
384        generates broken code for hbpcre." I have changed the declarations to use
385        USPTR.
387    16. GNU libtool is named differently on some systems. The autogen.sh script now
388        tries several variants such as glibtoolize (MacOSX) and libtoolize1x
389        (FreeBSD).
391    17. Applied Craig's patch that fixes an HP aCC compile error in pcre 8.00
392        (strtoXX undefined when compiling pcrecpp.cc). The patch contains this
393        comment: "Figure out how to create a longlong from a string: strtoll and
394        equivalent. It's not enough to call AC_CHECK_FUNCS: hpux has a strtoll, for
395        instance, but it only takes 2 args instead of 3!"
397    18. A subtle bug concerned with back references has been fixed by a change of
398        specification, with a corresponding code fix. A pattern such as
399        ^(xa|=?\1a)+$ which contains a back reference inside the group to which it
400        refers, was giving matches when it shouldn't. For example, xa=xaaa would
401        match that pattern. Interestingly, Perl (at least up to 5.11.3) has the
402        same bug. Such groups have to be quantified to be useful, or contained
403        inside another quantified group. (If there's no repetition, the reference
404        can never match.) The problem arises because, having left the group and
405        moved on to the rest of the pattern, a later failure that backtracks into
406        the group uses the captured value from the final iteration of the group
407        rather than the correct earlier one. I have fixed this in PCRE by forcing
408        any group that contains a reference to itself to be an atomic group; that
409        is, there cannot be any backtracking into it once it has completed. This is
410        similar to recursive and subroutine calls.
413    Version 8.00 19-Oct-09
414    ----------------------
416    1.  The table for translating pcre_compile() error codes into POSIX error codes
417        was out-of-date, and there was no check on the pcre_compile() error code
418        being within the table. This could lead to an OK return being given in
419        error.
421    2.  Changed the call to open a subject file in pcregrep from fopen(pathname,
422        "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
423        in a Windows environment.
425    3.  The pcregrep --count option prints the count for each file even when it is
426        zero, as does GNU grep. However, pcregrep was also printing all files when
427        --files-with-matches was added. Now, when both options are given, it prints
428        counts only for those files that have at least one match. (GNU grep just
429        prints the file name in this circumstance, but including the count seems
430        more useful - otherwise, why use --count?) Also ensured that the
431        combination -clh just lists non-zero counts, with no names.
433    4.  The long form of the pcregrep -F option was incorrectly implemented as
434        --fixed_strings instead of --fixed-strings. This is an incompatible change,
435        but it seems right to fix it, and I didn't think it was worth preserving
436        the old behaviour.
438    5.  The command line items --regex=pattern and --regexp=pattern were not
439        recognized by pcregrep, which required --regex pattern or --regexp pattern
440        (with a space rather than an '='). The man page documented the '=' forms,
441        which are compatible with GNU grep; these now work.
443    6.  No libpcreposix.pc file was created for pkg-config; there was just
444        libpcre.pc and libpcrecpp.pc. The omission has been rectified.
446    7.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
447        when UCP support is not needed, by modifying the Python script that
448        generates it from Unicode data files. This should not matter if the module
449        is correctly used as a library, but I received one complaint about 50K of
450        unwanted data. My guess is that the person linked everything into his
451        program rather than using a library. Anyway, it does no harm.
453    8.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
454        was a minimum greater than 1 for a wide character in a possessive
455        repetition. The same bug could also affect patterns like /(\x{ff}{0,2})*/8
456        which had an unlimited repeat of a nested, fixed maximum repeat of a wide
457        character. Chaos in the form of incorrect output or a compiling loop could
458        result.
460    9.  The restrictions on what a pattern can contain when partial matching is
461        requested for pcre_exec() have been removed. All patterns can now be
462        partially matched by this function. In addition, if there are at least two
463        slots in the offset vector, the offset of the earliest inspected character
464        for the match and the offset of the end of the subject are set in them when
465        PCRE_ERROR_PARTIAL is returned.
467    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
468        synonymous with PCRE_PARTIAL, for backwards compatibility, and
469        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
470        and may be more useful for multi-segment matching.
472    11. Partial matching with pcre_exec() is now more intuitive. A partial match
473        used to be given if ever the end of the subject was reached; now it is
474        given only if matching could not proceed because another character was
475        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
476        string "Z", which now yields "no match" instead of "partial match". In the
477        case of pcre_dfa_exec(), "no match" is given if every matching path for the
478        final character ended with (*FAIL).
480    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
481        if the pattern had a "must contain" character that was already found in the
482        earlier partial match, unless partial matching was again requested. For
483        example, with the pattern /dog.(body)?/, the "must contain" character is
484        "g". If the first part-match was for the string "dog", restarting with
485        "sbody" failed. This bug has been fixed.
487    13. The string returned by pcre_dfa_exec() after a partial match has been
488        changed so that it starts at the first inspected character rather than the
489        first character of the match. This makes a difference only if the pattern
490        starts with a lookbehind assertion or \b or \B (\K is not supported by
491        pcre_dfa_exec()). It's an incompatible change, but it makes the two
492        matching functions compatible, and I think it's the right thing to do.
494    14. Added a pcredemo man page, created automatically from the pcredemo.c file,
495        so that the demonstration program is easily available in environments where
496        PCRE has not been installed from source.
498    15. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
499        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
500        library.
502    16. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
503        It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
504        is not the first non-POSIX option to be added. Clearly some people find
505        these options useful.
507    17. If a caller to the POSIX matching function regexec() passes a non-zero
508        value for nmatch with a NULL value for pmatch, the value of
509        nmatch is forced to zero.
511    18. RunGrepTest did not have a test for the availability of the -u option of
512        the diff command, as RunTest does. It now checks in the same way as
513        RunTest, and also checks for the -b option.
515    19. If an odd number of negated classes containing just a single character
516        interposed, within parentheses, between a forward reference to a named
517        subpattern and the definition of the subpattern, compilation crashed with
518        an internal error, complaining that it could not find the referenced
519        subpattern. An example of a crashing pattern is /(?&A)(([^m])(?<A>))/.
520        [The bug was that it was starting one character too far in when skipping
521        over the character class, thus treating the ] as data rather than
522        terminating the class. This meant it could skip too much.]
524    20. Added PCRE_NOTEMPTY_ATSTART in order to be able to correctly implement the
525        /g option in pcretest when the pattern contains \K, which makes it possible
526        to have an empty string match not at the start, even when the pattern is
527        anchored. Updated pcretest and pcredemo to use this option.
529    21. If the maximum number of capturing subpatterns in a recursion was greater
530        than the maximum at the outer level, the higher number was returned, but
531        with unset values at the outer level. The correct (outer level) value is
532        now given.
534    22. If (*ACCEPT) appeared inside capturing parentheses, previous releases of
535        PCRE did not set those parentheses (unlike Perl). I have now found a way to
536        make it do so. The string so far is captured, making this feature
537        compatible with Perl.
539    23. The tests have been re-organized, adding tests 11 and 12, to make it
540        possible to check the Perl 5.10 features against Perl 5.10.
542    24. Perl 5.10 allows subroutine calls in lookbehinds, as long as the subroutine
543        pattern matches a fixed length string. PCRE did not allow this; now it
544        does. Neither allows recursion.
546    25. I finally figured out how to implement a request to provide the minimum
547        length of subject string that was needed in order to match a given pattern.
548        (It was back references and recursion that I had previously got hung up
549        on.) This code has now been added to pcre_study(); it finds a lower bound
550        to the length of subject needed. It is not necessarily the greatest lower
551        bound, but using it to avoid searching strings that are too short does give
552        some useful speed-ups. The value is available to calling programs via
553        pcre_fullinfo().
555    26. While implementing 25, I discovered to my embarrassment that pcretest had
556        not been passing the result of pcre_study() to pcre_dfa_exec(), so the
557        study optimizations had never been tested with that matching function.
558        Oops. What is worse, even when it was passed study data, there was a bug in
559        pcre_dfa_exec() that meant it never actually used it. Double oops. There
560        were also very few tests of studied patterns with pcre_dfa_exec().
562    27. If (?| is used to create subpatterns with duplicate numbers, they are now
563        allowed to have the same name, even if PCRE_DUPNAMES is not set. However,
564        on the other side of the coin, they are no longer allowed to have different
565        names, because these cannot be distinguished in PCRE, and this has caused
566        confusion. (This is a difference from Perl.)
568    28. When duplicate subpattern names are present (necessarily with different
569        numbers, as required by 27 above), and a test is made by name in a
570        conditional pattern, either for a subpattern having been matched, or for
571        recursion in such a pattern, all the associated numbered subpatterns are
572        tested, and the overall condition is true if the condition is true for any
573        one of them. This is the way Perl works, and is also more like the way
574        testing by number works.
577    Version 7.9 11-Apr-09
578    ---------------------
580    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
581        (pcretest), all targets were linked against these libraries. This included
582        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
583        libraries. This caused unwanted dependencies to be created. This problem
584        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
585        pcretest is linked with readline.
587    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
588        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
589        moved outside it again, because FALSE and TRUE are already defined in AIX,
590        but BOOL is not.
592    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
593        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
595    4.  The pcregrep documentation said spaces were inserted as well as colons (or
596        hyphens) following file names and line numbers when outputting matching
597        lines. This is not true; no spaces are inserted. I have also clarified the
598        wording for the --colour (or --color) option.
600    5.  In pcregrep, when --colour was used with -o, the list of matching strings
601        was not coloured; this is different to GNU grep, so I have changed it to be
602        the same.
604    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
605        each matching line was coloured. Now it goes on to look for further matches
606        of any of the test patterns, which is the same behaviour as GNU grep.
608    7.  A pattern that could match an empty string could cause pcregrep to loop; it
609        doesn't make sense to accept an empty string match in pcregrep, so I have
610        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
611        seems to be how GNU grep behaves.
613    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
614        start or after a newline", because the conditional assertion was not being
615        correctly handled. The rule now is that both the assertion and what follows
616        in the first alternative must satisfy the test.
618    9.  If auto-callout was enabled in a pattern with a conditional group whose
619        condition was an assertion, PCRE could crash during matching, both with
620        pcre_exec() and pcre_dfa_exec().
622    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
623        used for matching.
625    11. Unicode property support in character classes was not working for
626        characters (bytes) greater than 127 when not in UTF-8 mode.
628    12. Added the -M command line option to pcretest.
630    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
632    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
634    16. Added comments and documentation about mis-use of no_arg in the C++
635        wrapper.
637    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
638        from Martin Jerabek that uses macro names for all relevant character and
639        string constants.
641    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
642        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
643        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
644        these, but not everybody uses configure.
646    19. A conditional group that had only one branch was not being correctly
647        recognized as an item that could match an empty string. This meant that an
648        enclosing group might also not be so recognized, causing infinite looping
649        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
650        with the subject "ab", where knowledge that the repeated group can match
651        nothing is needed in order to break the loop.
653    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
654        exec(), but without supplying a callout function, matching went wrong.
656    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
657        leak if the size of the offset vector was greater than 30. When the vector
658        is smaller, the saved offsets during recursion go onto a local stack
659        vector, but for larger vectors malloc() is used. It was failing to free
660        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
661        error, in fact).
663    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
664        heapframe that is used only when UTF-8 support is enabled. This caused no
665        problem, but was untidy.
667    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
668        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
669        included within another project.
671    24. Steven Van Ingelgem's patches to add more options to the CMake support,
672        slightly modified by me:
674          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
675              not building pcregrep.
677          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
678              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
680    25. Forward references, both numeric and by name, in patterns that made use of
681        duplicate group numbers, could behave incorrectly or give incorrect errors,
682        because when scanning forward to find the reference group, PCRE was not
683        taking into account the duplicate group numbers. A pattern such as
684        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
686    26. Changed a few more instances of "const unsigned char *" to USPTR, making
687        the feature of a custom pointer more persuasive (as requested by a user).
689    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
690        pcretest.c, inside #ifndefs, because it seems they are sometimes already
691        pre-defined.
693    28. Added support for (*UTF8) at the start of a pattern.
695    29. Arrange for flags added by the "release type" setting in CMake to be shown
696        in the configuration summary.
699    Version 7.8 05-Sep-08
700    ---------------------
702    1.  Replaced UCP searching code with optimized version as implemented for Ad
703        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
704        stage table and inline lookup instead of a function, giving speed ups of 2
705        to 5 times on some simple patterns that I tested. Permission was given to
706        distribute the MultiStage2.py script that generates the tables (it's not in
707        the tarball, but is in the Subversion repository).
709    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
710        scripts.
712    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
713        a group with a zero qualifier. The result of the study could be incorrect,
714        or the function might crash, depending on the pattern.
716    4.  Caseless matching was not working for non-ASCII characters in back
717        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
718        It now works when Unicode Property Support is available.
720    5.  In pcretest, an escape such as \x{de} in the data was always generating
721        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
722        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
723        truncation.
725    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
727    7.  Added two (int) casts to pcregrep when printing the difference of two
728        pointers, in case they are 64-bit values.
730    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
731        test 2 if it fails.
733    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
734        and a #define of that name to empty if it is not externally set. This is to
735        allow users of MSVC to set it if necessary.
737    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
738        the convenience functions in the pcre_get.c source file.
740    11. An option change at the start of a pattern that had top-level alternatives
741        could cause overwriting and/or a crash. This command provoked a crash in
742        some environments:
744          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
746        This potential security problem was recorded as CVE-2008-2371.
748    12. For a pattern where the match had to start at the beginning or immediately
749        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
750        pcre_dfa_exec() could read past the end of the passed subject if there was
751        no match. To help with detecting such bugs (e.g. with valgrind), I modified
752        pcretest so that it places the subject at the end of its malloc-ed buffer.
754    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
755        exec() might read past the end of the data buffer in UTF-8 mode.
757    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
758        the data contained the byte 0x85 as part of a UTF-8 character within its
759        first line. This applied both to normal and DFA matching.
761    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
762        /^[^d]*?$/8 failed to match "abc".
764    16. Added a missing copyright notice to pcrecpp_internal.h.
766    17. Make it more clear in the documentation that values returned from
767        pcre_exec() in ovector are byte offsets, not character counts.
769    18. Tidied a few places to stop certain compilers from issuing warnings.
771    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
772        supplied by Stefan Weber. I made a further small update for 7.8 because
773        there is a change of source arrangements: the pcre_searchfuncs.c module is
774        replaced by pcre_ucd.c.
777    Version 7.7 07-May-08
778    ---------------------
780    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
781        a string to a long long, pretend we don't even have a long long." This is
782        done by checking for the strtoq, strtoll, and _strtoi64 functions.
784    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
785        pre-7.6 versions, which defined a global no_arg variable instead of putting
786        it in the RE class. (See also #8 below.)
788    3.  Remove a line of dead code, identified by coverity and reported by Nuno
789        Lopes.
791    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
793        (1) The include/exclude patterns were being applied to the whole pathnames
794            of files, instead of just to the final components.
796        (2) If there was more than one level of directory, the subdirectories were
797            skipped unless they satisfied the include/exclude conditions. This is
798            inconsistent with GNU grep (and could even be seen as contrary to the
799            pcregrep specification - which I improved to make it absolutely clear).
800            The action now is always to scan all levels of directory, and just
801            apply the include/exclude patterns to regular files.
803    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
804        --exclude_dir in the tests to avoid scanning .svn directories.
806    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
807        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
808        doesn't support NULs in patterns.
810    7.  Added some missing "const"s to declarations of static tables in
811        pcre_compile.c and pcre_dfa_exec.c.
813    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
814        caused by fix #2  above. (Subsequently also a second patch to fix the
815        first patch. And a third patch - this was a messy problem.)
817    9.  Applied Craig's patch to remove the use of push_back().
819    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
820        matching function regexec().
822    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
823        which, however, unlike Perl's \g{...}, are subroutine calls, not back
824        references. PCRE supports relative numbers with this syntax (I don't think
825        Oniguruma does).
827    12. Previously, a group with a zero repeat such as (...){0} was completely
828        omitted from the compiled regex. However, this means that if the group
829        was called as a subroutine from elsewhere in the pattern, things went wrong
830        (an internal error was given). Such groups are now left in the compiled
831        pattern, with a new opcode that causes them to be skipped at execution
832        time.
834    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
835        to the way PCRE behaves:
837        (a) A lone ] character is dis-allowed (Perl treats it as data).
839        (b) A back reference to an unmatched subpattern matches an empty string
840            (Perl fails the current match path).
842        (c) A data ] in a character class must be notated as \] because if the
843            first data character in a class is ], it defines an empty class. (In
844            Perl it is not possible to have an empty class.) The empty class []
845            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
846            The negative empty class [^] matches any one character, independently
847            of the DOTALL setting.
849    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
850        non-existent subpattern following a character class starting with ']' and
851        containing () gave an internal compiling error instead of "reference to
852        non-existent subpattern". Fortunately, when the pattern did exist, the
853        compiled code was correct. (When scanning forwards to check for the
854        existencd of the subpattern, it was treating the data ']' as terminating
855        the class, so got the count wrong. When actually compiling, the reference
856        was subsequently set up correctly.)
858    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
859        it was being rejected as not supported by pcre_dfa_exec(), even though
860        other assertions are supported. I have made pcre_dfa_exec() support
861        (*FAIL).
863    16. The implementation of 13c above involved the invention of a new opcode,
864        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
865        cannot be changed at match time, I realized I could make a small
866        improvement to matching performance by compiling OP_ALLANY instead of
867        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
868        on the OP_ANY path.
870    17. Compiling pcretest on Windows with readline support failed without the
871        following two fixes: (1) Make the unistd.h include conditional on
872        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
874    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
875        ncurses library to be included for pcretest when ReadLine support is
876        requested, but also to allow for it to be overridden. This patch came from
877        Daniel Bergström.
879    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
880        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
881        any errors with the current Unicode tables. Thanks to Peter Kankowski for
882        spotting this.
885    Version 7.6 28-Jan-08
886    ---------------------
888    1.  A character class containing a very large number of characters with
889        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
890        overflow.
892    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
893        HAVE_LONG_LONG is not defined.
895    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
896        bring them up to date and include new features. This patch includes:
898        - Fixed PH's badly added libz and libbz2 support.
899        - Fixed a problem with static linking.
900        - Added pcredemo. [But later removed - see 7 below.]
901        - Fixed dftables problem and added an option.
902        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
903            HAVE_LONG_LONG.
904        - Added readline support for pcretest.
905        - Added an listing of the option settings after cmake has run.
907    4.  A user submitted a patch to Makefile that makes it easy to create
908        "pcre.dll" under mingw when using Configure/Make. I added stuff to
909        Makefile.am that cause it to include this special target, without
910        affecting anything else. Note that the same mingw target plus all
911        the other distribution libraries and programs are now supported
912        when configuring with CMake (see 6 below) instead of with
913        Configure/Make.
915    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
916        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
917        exported in the Windows port". It has not yet been confirmed that the patch
918        solves the problem, but it does no harm.
920    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
921        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
922        with CMake, and also correct the comment about stack recursion.
924    7.  Remove the automatic building of pcredemo from the ./configure system and
925        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
926        of a program that users should build themselves after PCRE is installed, so
927        building it automatically is not really right. What is more, it gave
928        trouble in some build environments.
930    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
933    Version 7.5 10-Jan-08
934  ---------------------  ---------------------
936  1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'  1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
937      values in parens when parsing an RE using the C++ wrapper."      values in parens when parsing an RE using the C++ wrapper."
939  2.  Negative specials like \S did not work in character classes in UTF-8 mode.  2.  Negative specials like \S did not work in character classes in UTF-8 mode.
940      Characters greater than 255 were excluded from the class instead of being      Characters greater than 255 were excluded from the class instead of being
941      included.      included.
943  3.  The same bug as (2) above applied to negated POSIX classes such as  3.  The same bug as (2) above applied to negated POSIX classes such as
944      [:^space:].      [:^space:].
946  4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it  4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
947      defined or documented. It seems to have been a typo for PCRE_STATIC, so      defined or documented. It seems to have been a typo for PCRE_STATIC, so
948      I have changed it.      I have changed it.
950  5.  The construct (?&) was not diagnosed as a syntax error (it referenced the  5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
951      first named subpattern) and a construct such as (?&a) would reference the      first named subpattern) and a construct such as (?&a) would reference the
952      first named subpattern whose name started with "a" (in other words, the      first named subpattern whose name started with "a" (in other words, the
953      length check was missing).      length check was missing). Both these problems are fixed. "Subpattern name
954        expected" is now given for (?&) (a zero-length name), and this patch also
955        makes it give the same error for \k'' (previously it complained that that
956        was a reference to a non-existent subpattern).
958  6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;  6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
959      this is right because (?- can be followed by option settings as well as by      this is right because (?- can be followed by option settings as well as by
960      digits. I have, however, made the messages clearer.      digits. I have, however, made the messages clearer.
962    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
963        than the number used in the conditional) now cause a compile-time error.
964        This is actually not compatible with Perl, which accepts such patterns, but
965        treats the conditional as always being FALSE (as PCRE used to), but it
966        seems to me that giving a diagnostic is better.
968    8.  Change "alphameric" to the more common word "alphanumeric" in comments
969        and messages.
971    9.  Fix two occurrences of "backslash" in comments that should have been
972        "backspace".
974    10. Remove two redundant lines of code that can never be obeyed (their function
975        was moved elsewhere).
977    11. The program that makes PCRE's Unicode character property table had a bug
978        which caused it to generate incorrect table entries for sequences of
979        characters that have the same character type, but are in different scripts.
980        It amalgamated them into a single range, with the script of the first of
981        them. In other words, some characters were in the wrong script. There were
982        thirteen such cases, affecting characters in the following ranges:
984          U+002b0 - U+002c1
985          U+0060c - U+0060d
986          U+0061e - U+00612
987          U+0064b - U+0065e
988          U+0074d - U+0076d
989          U+01800 - U+01805
990          U+01d00 - U+01d77
991          U+01d9b - U+01dbf
992          U+0200b - U+0200f
993          U+030fc - U+030fe
994          U+03260 - U+0327f
995          U+0fb46 - U+0fbb1
996          U+10450 - U+1049d
998    12. The -o option (show only the matching part of a line) for pcregrep was not
999        compatible with GNU grep in that, if there was more than one match in a
1000        line, it showed only the first of them. It now behaves in the same way as
1001        GNU grep.
1003    13. If the -o and -v options were combined for pcregrep, it printed a blank
1004        line for every non-matching line. GNU grep prints nothing, and pcregrep now
1005        does the same. The return code can be used to tell if there were any
1006        non-matching lines.
1008    14. Added --file-offsets and --line-offsets to pcregrep.
1010    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
1011        infinitely looping recursion. The bug was that positive lookaheads were not
1012        being skipped when checking for a possible empty match (negative lookaheads
1013        and both kinds of lookbehind were skipped).
1015    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
1016        inclusion of <windows.h> to before rather than after the definition of
1017        INVALID_FILE_ATTRIBUTES (patch from David Byron).
1019    17. Specifying a possessive quantifier with a specific limit for a Unicode
1020        character property caused pcre_compile() to compile bad code, which led at
1021        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
1022        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
1023        caused the error; without that there was no problem.
1025    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
1027    19. Added --enable-pcretest-libreadline.
1029    20. In pcrecpp.cc, the variable 'count' was incremented twice in
1030        RE::GlobalReplace(). As a result, the number of replacements returned was
1031        double what it should be. I removed one of the increments, but Craig sent a
1032        later patch that removed the other one (the right fix) and added unit tests
1033        that check the return values (which was not done before).
1035    21. Several CMake things:
1037        (1) Arranged that, when cmake is used on Unix, the libraries end up with
1038            the names libpcre and libpcreposix, not just pcre and pcreposix.
1040        (2) The above change means that pcretest and pcregrep are now correctly
1041            linked with the newly-built libraries, not previously installed ones.
1045    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
1046        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
1047        UTF-8 newline character). The key issue is that the pattern starts .*;
1048        this means that the match must be either at the beginning, or after a
1049        newline. The bug was in the code for advancing after a failed match and
1050        checking that the new position followed a newline. It was not taking
1051        account of UTF-8 characters correctly.
1053    23. PCRE was behaving differently from Perl in the way it recognized POSIX
1054        character classes. PCRE was not treating the sequence [:...:] as a
1055        character class unless the ... were all letters. Perl, however, seems to
1056        allow any characters between [: and :], though of course it rejects as
1057        unknown any "names" that contain non-letters, because all the known class
1058        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
1059        for example, whereas PCRE did not - it did not recognize a POSIX character
1060        class. This seemed a bit dangerous, so the code has been changed to be
1061        closer to Perl. The behaviour is not identical to Perl, because PCRE will
1062        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
1063        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
1064        Perl does, and where it didn't before.
1066    24. Rewrite so as to remove the single use of %n from pcregrep because in some
1067        Windows environments %n is disabled by default.
1070  Version 7.4 21-Sep-07  Version 7.4 21-Sep-07
1071  ---------------------  ---------------------

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