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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 7.4 10-Sep-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.
61    Version 8.10 25-Jun-2010
62    ------------------------
64    1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
65        THEN.
67    2.  (*ACCEPT) was not working when inside an atomic group.
69    3.  Inside a character class, \B is treated as a literal by default, but
70        faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
71        causes the error). The code is unchanged, but I tidied the documentation.
73    4.  Inside a character class, PCRE always treated \R and \X as literals,
74        whereas Perl faults them if its -w option is set. I have changed PCRE so
75        that it faults them when PCRE_EXTRA is set.
77    5.  Added support for \N, which always matches any character other than
78        newline. (It is the same as "." when PCRE_DOTALL is not set.)
80    6.  When compiling pcregrep with newer versions of gcc which may have
81        FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
82        declared with attribute warn_unused_result" were given. Just casting the
83        result to (void) does not stop the warnings; a more elaborate fudge is
84        needed. I've used a macro to implement this.
86    7.  Minor change to pcretest.c to avoid a compiler warning.
88    8.  Added four artifical Unicode properties to help with an option to make
89        \s etc use properties (see next item). The new properties are: Xan
90        (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
92    9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
93        use Unicode properties. (*UCP) at the start of a pattern can be used to set
94        this option. Modified pcretest to add /W to test this facility. Added
95        REG_UCP to make it available via the POSIX interface.
97    10. Added --line-buffered to pcregrep.
99    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
100        studied, and the match started with a letter with a code point greater than
101        127 whose first byte was different to the first byte of the other case of
102        the letter, the other case of this starting letter was not recognized
103        (#976).
105    12. If a pattern that was studied started with a repeated Unicode property
106        test, for example, \p{Nd}+, there was the theoretical possibility of
107        setting up an incorrect bitmap of starting bytes, but fortunately it could
108        not have actually happened in practice until change 8 above was made (it
109        added property types that matched character-matching opcodes).
111    13. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
112        possible starting bytes for non-anchored patterns.
114    14. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes
115        \R, and also a number of cases that involve Unicode properties, both
116        explicit and implicit when PCRE_UCP is set.
118    15. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
119        input, it could crash or give wrong results if characters with values
120        greater than 0xc0 were present in the subject string. (Detail: it assumed
121        UTF-8 input when processing these items.)
123    16. Added a lot of (int) casts to avoid compiler warnings in systems where
124        size_t is 64-bit (#991).
126    17. Added a check for running out of memory when PCRE is compiled with
127        --disable-stack-for-recursion (#990).
129    18. If the last data line in a file for pcretest does not have a newline on
130        the end, a newline was missing in the output.
132    19. The default pcre_chartables.c file recognizes only ASCII characters (values
133        less than 128) in its various bitmaps. However, there is a facility for
134        generating tables according to the current locale when PCRE is compiled. It
135        turns out that in some environments, 0x85 and 0xa0, which are Unicode space
136        characters, are recognized by isspace() and therefore were getting set in
137        these tables, and indeed these tables seem to approximate to ISO 8859. This
138        caused a problem in UTF-8 mode when pcre_study() was used to create a list
139        of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
140        which of course cannot start UTF-8 characters. I have changed the code so
141        that only real ASCII characters (less than 128) and the correct starting
142        bytes for UTF-8 encodings are set for characters greater than 127 when in
143        UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
144        altogether.)
146    20. Added the /T option to pcretest so as to be able to run tests with non-
147        standard character tables, thus making it possible to include the tests
148        used for 19 above in the standard set of tests.
150    21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
151        reference to a subpattern the other side of a comment that contains an
152        opening parenthesis caused either an internal compiling error, or a
153        reference to the wrong subpattern.
156    Version 8.02 19-Mar-2010
157    ------------------------
159    1.  The Unicode data tables have been updated to Unicode 5.2.0.
161    2.  Added the option --libs-cpp to pcre-config, but only when C++ support is
162        configured.
164    3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the
165        original author of that file, following a query about its status.
167    4.  On systems that do not have stdint.h (e.g. Solaris), check for and include
168        inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.
170    5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
171        quantifier applied to a forward-referencing subroutine call, could compile
172        incorrect code or give the error "internal error: previously-checked
173        referenced subpattern not found".
175    6.  Both MS Visual Studio and Symbian OS have problems with initializing
176        variables to point to external functions. For these systems, therefore,
177        pcre_malloc etc. are now initialized to local functions that call the
178        relevant global functions.
180    7.  There were two entries missing in the vectors called coptable and poptable
181        in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.
182        I've fixed the data, and added a kludgy way of testing at compile time that
183        the lengths are correct (equal to the number of opcodes).
185    8.  Following on from 7, I added a similar kludge to check the length of the
186        eint vector in pcreposix.c.
188    9.  Error texts for pcre_compile() are held as one long string to avoid too
189        much relocation at load time. To find a text, the string is searched,
190        counting zeros. There was no check for running off the end of the string,
191        which could happen if a new error number was added without updating the
192        string.
194    10. \K gave a compile-time error if it appeared in a lookbehind assersion.
196    11. \K was not working if it appeared in an atomic group or in a group that
197        was called as a "subroutine", or in an assertion. Perl 5.11 documents that
198        \K is "not well defined" if used in an assertion. PCRE now accepts it if
199        the assertion is positive, but not if it is negative.
201    12. Change 11 fortuitously reduced the size of the stack frame used in the
202        "match()" function of pcre_exec.c by one pointer. Forthcoming
203        implementation of support for (*MARK) will need an extra pointer on the
204        stack; I have reserved it now, so that the stack frame size does not
205        decrease.
207    13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other
208        item in branch that calls a recursion is a subroutine call - as in the
209        second branch in the above example - was incorrectly given the compile-
210        time error "recursive call could loop indefinitely" because pcre_compile()
211        was not correctly checking the subroutine for matching a non-empty string.
213    14. The checks for overrunning compiling workspace could trigger after an
214        overrun had occurred. This is a "should never occur" error, but it can be
215        triggered by pathological patterns such as hundreds of nested parentheses.
216        The checks now trigger 100 bytes before the end of the workspace.
218    15. Fix typo in configure.ac: "srtoq" should be "strtoq".
221    Version 8.01 19-Jan-2010
222    ------------------------
224    1.  If a pattern contained a conditional subpattern with only one branch (in
225        particular, this includes all (*DEFINE) patterns), a call to pcre_study()
226        computed the wrong minimum data length (which is of course zero for such
227        subpatterns). This could cause incorrect "no match" results.
229    2.  For patterns such as (?i)a(?-i)b|c where an option setting at the start of
230        the pattern is reset in the first branch, pcre_compile() failed with
231        "internal error: code overflow at offset...". This happened only when
232        the reset was to the original external option setting. (An optimization
233        abstracts leading options settings into an external setting, which was the
234        cause of this.)
236    3.  A pattern such as ^(?!a(*SKIP)b) where a negative assertion contained one
237        of the verbs SKIP, PRUNE, or COMMIT, did not work correctly. When the
238        assertion pattern did not match (meaning that the assertion was true), it
239        was incorrectly treated as false if the SKIP had been reached during the
240        matching. This also applied to assertions used as conditions.
242    4.  If an item that is not supported by pcre_dfa_exec() was encountered in an
243        assertion subpattern, including such a pattern used as a condition,
244        unpredictable results occurred, instead of the error return
247    5.  The C++ GlobalReplace function was not working like Perl for the special
248        situation when an empty string is matched. It now does the fancy magic
249        stuff that is necessary.
251    6.  In pcre_internal.h, obsolete includes to setjmp.h and stdarg.h have been
252        removed. (These were left over from very, very early versions of PCRE.)
254    7.  Some cosmetic changes to the code to make life easier when compiling it
255        as part of something else:
257        (a) Change DEBUG to PCRE_DEBUG.
259        (b) In pcre_compile(), rename the member of the "branch_chain" structure
260            called "current" as "current_branch", to prevent a collision with the
261            Linux macro when compiled as a kernel module.
263        (c) In pcre_study(), rename the function set_bit() as set_table_bit(), to
264            prevent a collision with the Linux macro when compiled as a kernel
265            module.
267    8.  In pcre_compile() there are some checks for integer overflows that used to
268        cast potentially large values to (double). This has been changed to that
269        when building, a check for int64_t is made, and if it is found, it is used
270        instead, thus avoiding the use of floating point arithmetic. (There is no
271        other use of FP in PCRE.) If int64_t is not found, the fallback is to
272        double.
274    9.  Added two casts to avoid signed/unsigned warnings from VS Studio Express
275        2005 (difference between two addresses compared to an unsigned value).
277    10. Change the standard AC_CHECK_LIB test for libbz2 in configure.ac to a
278        custom one, because of the following reported problem in Windows:
280          - libbz2 uses the Pascal calling convention (WINAPI) for the functions
281              under Win32.
282          - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",
283              therefore missing the function definition.
284          - The compiler thus generates a "C" signature for the test function.
285          - The linker fails to find the "C" function.
286          - PCRE fails to configure if asked to do so against libbz2.
288    11. When running libtoolize from libtool-2.2.6b as part of autogen.sh, these
289        messages were output:
291          Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and
292          rerunning libtoolize, to keep the correct libtool macros in-tree.
293          Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
295        I have done both of these things.
297    12. Although pcre_dfa_exec() does not use nearly as much stack as pcre_exec()
298        most of the time, it *can* run out if it is given a pattern that contains a
299        runaway infinite recursion. I updated the discussion in the pcrestack man
300        page.
302    13. Now that we have gone to the x.xx style of version numbers, the minor
303        version may start with zero. Using 08 or 09 is a bad idea because users
304        might check the value of PCRE_MINOR in their code, and 08 or 09 may be
305        interpreted as invalid octal numbers. I've updated the previous comment in
306        configure.ac, and also added a check that gives an error if 08 or 09 are
307        used.
309    14. Change 8.00/11 was not quite complete: code had been accidentally omitted,
310        causing partial matching to fail when the end of the subject matched \W
311        in a UTF-8 pattern where \W was quantified with a minimum of 3.
313    15. There were some discrepancies between the declarations in pcre_internal.h
314        of _pcre_is_newline(), _pcre_was_newline(), and _pcre_valid_utf8() and
315        their definitions. The declarations used "const uschar *" and the
316        definitions used USPTR. Even though USPTR is normally defined as "const
317        unsigned char *" (and uschar is typedeffed as "unsigned char"), it was
318        reported that: "This difference in casting confuses some C++ compilers, for
319        example, SunCC recognizes above declarations as different functions and
320        generates broken code for hbpcre." I have changed the declarations to use
321        USPTR.
323    16. GNU libtool is named differently on some systems. The autogen.sh script now
324        tries several variants such as glibtoolize (MacOSX) and libtoolize1x
325        (FreeBSD).
327    17. Applied Craig's patch that fixes an HP aCC compile error in pcre 8.00
328        (strtoXX undefined when compiling pcrecpp.cc). The patch contains this
329        comment: "Figure out how to create a longlong from a string: strtoll and
330        equivalent. It's not enough to call AC_CHECK_FUNCS: hpux has a strtoll, for
331        instance, but it only takes 2 args instead of 3!"
333    18. A subtle bug concerned with back references has been fixed by a change of
334        specification, with a corresponding code fix. A pattern such as
335        ^(xa|=?\1a)+$ which contains a back reference inside the group to which it
336        refers, was giving matches when it shouldn't. For example, xa=xaaa would
337        match that pattern. Interestingly, Perl (at least up to 5.11.3) has the
338        same bug. Such groups have to be quantified to be useful, or contained
339        inside another quantified group. (If there's no repetition, the reference
340        can never match.) The problem arises because, having left the group and
341        moved on to the rest of the pattern, a later failure that backtracks into
342        the group uses the captured value from the final iteration of the group
343        rather than the correct earlier one. I have fixed this in PCRE by forcing
344        any group that contains a reference to itself to be an atomic group; that
345        is, there cannot be any backtracking into it once it has completed. This is
346        similar to recursive and subroutine calls.
349    Version 8.00 19-Oct-09
350    ----------------------
352    1.  The table for translating pcre_compile() error codes into POSIX error codes
353        was out-of-date, and there was no check on the pcre_compile() error code
354        being within the table. This could lead to an OK return being given in
355        error.
357    2.  Changed the call to open a subject file in pcregrep from fopen(pathname,
358        "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
359        in a Windows environment.
361    3.  The pcregrep --count option prints the count for each file even when it is
362        zero, as does GNU grep. However, pcregrep was also printing all files when
363        --files-with-matches was added. Now, when both options are given, it prints
364        counts only for those files that have at least one match. (GNU grep just
365        prints the file name in this circumstance, but including the count seems
366        more useful - otherwise, why use --count?) Also ensured that the
367        combination -clh just lists non-zero counts, with no names.
369    4.  The long form of the pcregrep -F option was incorrectly implemented as
370        --fixed_strings instead of --fixed-strings. This is an incompatible change,
371        but it seems right to fix it, and I didn't think it was worth preserving
372        the old behaviour.
374    5.  The command line items --regex=pattern and --regexp=pattern were not
375        recognized by pcregrep, which required --regex pattern or --regexp pattern
376        (with a space rather than an '='). The man page documented the '=' forms,
377        which are compatible with GNU grep; these now work.
379    6.  No libpcreposix.pc file was created for pkg-config; there was just
380        libpcre.pc and libpcrecpp.pc. The omission has been rectified.
382    7.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
383        when UCP support is not needed, by modifying the Python script that
384        generates it from Unicode data files. This should not matter if the module
385        is correctly used as a library, but I received one complaint about 50K of
386        unwanted data. My guess is that the person linked everything into his
387        program rather than using a library. Anyway, it does no harm.
389    8.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
390        was a minimum greater than 1 for a wide character in a possessive
391        repetition. The same bug could also affect patterns like /(\x{ff}{0,2})*/8
392        which had an unlimited repeat of a nested, fixed maximum repeat of a wide
393        character. Chaos in the form of incorrect output or a compiling loop could
394        result.
396    9.  The restrictions on what a pattern can contain when partial matching is
397        requested for pcre_exec() have been removed. All patterns can now be
398        partially matched by this function. In addition, if there are at least two
399        slots in the offset vector, the offset of the earliest inspected character
400        for the match and the offset of the end of the subject are set in them when
401        PCRE_ERROR_PARTIAL is returned.
403    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
404        synonymous with PCRE_PARTIAL, for backwards compatibility, and
405        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
406        and may be more useful for multi-segment matching.
408    11. Partial matching with pcre_exec() is now more intuitive. A partial match
409        used to be given if ever the end of the subject was reached; now it is
410        given only if matching could not proceed because another character was
411        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
412        string "Z", which now yields "no match" instead of "partial match". In the
413        case of pcre_dfa_exec(), "no match" is given if every matching path for the
414        final character ended with (*FAIL).
416    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
417        if the pattern had a "must contain" character that was already found in the
418        earlier partial match, unless partial matching was again requested. For
419        example, with the pattern /dog.(body)?/, the "must contain" character is
420        "g". If the first part-match was for the string "dog", restarting with
421        "sbody" failed. This bug has been fixed.
423    13. The string returned by pcre_dfa_exec() after a partial match has been
424        changed so that it starts at the first inspected character rather than the
425        first character of the match. This makes a difference only if the pattern
426        starts with a lookbehind assertion or \b or \B (\K is not supported by
427        pcre_dfa_exec()). It's an incompatible change, but it makes the two
428        matching functions compatible, and I think it's the right thing to do.
430    14. Added a pcredemo man page, created automatically from the pcredemo.c file,
431        so that the demonstration program is easily available in environments where
432        PCRE has not been installed from source.
434    15. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
435        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
436        library.
438    16. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
439        It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
440        is not the first non-POSIX option to be added. Clearly some people find
441        these options useful.
443    17. If a caller to the POSIX matching function regexec() passes a non-zero
444        value for nmatch with a NULL value for pmatch, the value of
445        nmatch is forced to zero.
447    18. RunGrepTest did not have a test for the availability of the -u option of
448        the diff command, as RunTest does. It now checks in the same way as
449        RunTest, and also checks for the -b option.
451    19. If an odd number of negated classes containing just a single character
452        interposed, within parentheses, between a forward reference to a named
453        subpattern and the definition of the subpattern, compilation crashed with
454        an internal error, complaining that it could not find the referenced
455        subpattern. An example of a crashing pattern is /(?&A)(([^m])(?<A>))/.
456        [The bug was that it was starting one character too far in when skipping
457        over the character class, thus treating the ] as data rather than
458        terminating the class. This meant it could skip too much.]
460    20. Added PCRE_NOTEMPTY_ATSTART in order to be able to correctly implement the
461        /g option in pcretest when the pattern contains \K, which makes it possible
462        to have an empty string match not at the start, even when the pattern is
463        anchored. Updated pcretest and pcredemo to use this option.
465    21. If the maximum number of capturing subpatterns in a recursion was greater
466        than the maximum at the outer level, the higher number was returned, but
467        with unset values at the outer level. The correct (outer level) value is
468        now given.
470    22. If (*ACCEPT) appeared inside capturing parentheses, previous releases of
471        PCRE did not set those parentheses (unlike Perl). I have now found a way to
472        make it do so. The string so far is captured, making this feature
473        compatible with Perl.
475    23. The tests have been re-organized, adding tests 11 and 12, to make it
476        possible to check the Perl 5.10 features against Perl 5.10.
478    24. Perl 5.10 allows subroutine calls in lookbehinds, as long as the subroutine
479        pattern matches a fixed length string. PCRE did not allow this; now it
480        does. Neither allows recursion.
482    25. I finally figured out how to implement a request to provide the minimum
483        length of subject string that was needed in order to match a given pattern.
484        (It was back references and recursion that I had previously got hung up
485        on.) This code has now been added to pcre_study(); it finds a lower bound
486        to the length of subject needed. It is not necessarily the greatest lower
487        bound, but using it to avoid searching strings that are too short does give
488        some useful speed-ups. The value is available to calling programs via
489        pcre_fullinfo().
491    26. While implementing 25, I discovered to my embarrassment that pcretest had
492        not been passing the result of pcre_study() to pcre_dfa_exec(), so the
493        study optimizations had never been tested with that matching function.
494        Oops. What is worse, even when it was passed study data, there was a bug in
495        pcre_dfa_exec() that meant it never actually used it. Double oops. There
496        were also very few tests of studied patterns with pcre_dfa_exec().
498    27. If (?| is used to create subpatterns with duplicate numbers, they are now
499        allowed to have the same name, even if PCRE_DUPNAMES is not set. However,
500        on the other side of the coin, they are no longer allowed to have different
501        names, because these cannot be distinguished in PCRE, and this has caused
502        confusion. (This is a difference from Perl.)
504    28. When duplicate subpattern names are present (necessarily with different
505        numbers, as required by 27 above), and a test is made by name in a
506        conditional pattern, either for a subpattern having been matched, or for
507        recursion in such a pattern, all the associated numbered subpatterns are
508        tested, and the overall condition is true if the condition is true for any
509        one of them. This is the way Perl works, and is also more like the way
510        testing by number works.
513    Version 7.9 11-Apr-09
514    ---------------------
516    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
517        (pcretest), all targets were linked against these libraries. This included
518        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
519        libraries. This caused unwanted dependencies to be created. This problem
520        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
521        pcretest is linked with readline.
523    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
524        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
525        moved outside it again, because FALSE and TRUE are already defined in AIX,
526        but BOOL is not.
528    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
529        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
531    4.  The pcregrep documentation said spaces were inserted as well as colons (or
532        hyphens) following file names and line numbers when outputting matching
533        lines. This is not true; no spaces are inserted. I have also clarified the
534        wording for the --colour (or --color) option.
536    5.  In pcregrep, when --colour was used with -o, the list of matching strings
537        was not coloured; this is different to GNU grep, so I have changed it to be
538        the same.
540    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
541        each matching line was coloured. Now it goes on to look for further matches
542        of any of the test patterns, which is the same behaviour as GNU grep.
544    7.  A pattern that could match an empty string could cause pcregrep to loop; it
545        doesn't make sense to accept an empty string match in pcregrep, so I have
546        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
547        seems to be how GNU grep behaves.
549    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
550        start or after a newline", because the conditional assertion was not being
551        correctly handled. The rule now is that both the assertion and what follows
552        in the first alternative must satisfy the test.
554    9.  If auto-callout was enabled in a pattern with a conditional group whose
555        condition was an assertion, PCRE could crash during matching, both with
556        pcre_exec() and pcre_dfa_exec().
558    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
559        used for matching.
561    11. Unicode property support in character classes was not working for
562        characters (bytes) greater than 127 when not in UTF-8 mode.
564    12. Added the -M command line option to pcretest.
566    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
568    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
570    16. Added comments and documentation about mis-use of no_arg in the C++
571        wrapper.
573    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
574        from Martin Jerabek that uses macro names for all relevant character and
575        string constants.
577    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
578        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
579        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
580        these, but not everybody uses configure.
582    19. A conditional group that had only one branch was not being correctly
583        recognized as an item that could match an empty string. This meant that an
584        enclosing group might also not be so recognized, causing infinite looping
585        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
586        with the subject "ab", where knowledge that the repeated group can match
587        nothing is needed in order to break the loop.
589    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
590        exec(), but without supplying a callout function, matching went wrong.
592    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
593        leak if the size of the offset vector was greater than 30. When the vector
594        is smaller, the saved offsets during recursion go onto a local stack
595        vector, but for larger vectors malloc() is used. It was failing to free
596        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
597        error, in fact).
599    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
600        heapframe that is used only when UTF-8 support is enabled. This caused no
601        problem, but was untidy.
603    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
604        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
605        included within another project.
607    24. Steven Van Ingelgem's patches to add more options to the CMake support,
608        slightly modified by me:
610          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
611              not building pcregrep.
613          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
614              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
616    25. Forward references, both numeric and by name, in patterns that made use of
617        duplicate group numbers, could behave incorrectly or give incorrect errors,
618        because when scanning forward to find the reference group, PCRE was not
619        taking into account the duplicate group numbers. A pattern such as
620        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
622    26. Changed a few more instances of "const unsigned char *" to USPTR, making
623        the feature of a custom pointer more persuasive (as requested by a user).
625    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
626        pcretest.c, inside #ifndefs, because it seems they are sometimes already
627        pre-defined.
629    28. Added support for (*UTF8) at the start of a pattern.
631    29. Arrange for flags added by the "release type" setting in CMake to be shown
632        in the configuration summary.
635    Version 7.8 05-Sep-08
636    ---------------------
638    1.  Replaced UCP searching code with optimized version as implemented for Ad
639        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
640        stage table and inline lookup instead of a function, giving speed ups of 2
641        to 5 times on some simple patterns that I tested. Permission was given to
642        distribute the MultiStage2.py script that generates the tables (it's not in
643        the tarball, but is in the Subversion repository).
645    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
646        scripts.
648    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
649        a group with a zero qualifier. The result of the study could be incorrect,
650        or the function might crash, depending on the pattern.
652    4.  Caseless matching was not working for non-ASCII characters in back
653        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
654        It now works when Unicode Property Support is available.
656    5.  In pcretest, an escape such as \x{de} in the data was always generating
657        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
658        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
659        truncation.
661    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
663    7.  Added two (int) casts to pcregrep when printing the difference of two
664        pointers, in case they are 64-bit values.
666    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
667        test 2 if it fails.
669    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
670        and a #define of that name to empty if it is not externally set. This is to
671        allow users of MSVC to set it if necessary.
673    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
674        the convenience functions in the pcre_get.c source file.
676    11. An option change at the start of a pattern that had top-level alternatives
677        could cause overwriting and/or a crash. This command provoked a crash in
678        some environments:
680          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
682        This potential security problem was recorded as CVE-2008-2371.
684    12. For a pattern where the match had to start at the beginning or immediately
685        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
686        pcre_dfa_exec() could read past the end of the passed subject if there was
687        no match. To help with detecting such bugs (e.g. with valgrind), I modified
688        pcretest so that it places the subject at the end of its malloc-ed buffer.
690    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
691        exec() might read past the end of the data buffer in UTF-8 mode.
693    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
694        the data contained the byte 0x85 as part of a UTF-8 character within its
695        first line. This applied both to normal and DFA matching.
697    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
698        /^[^d]*?$/8 failed to match "abc".
700    16. Added a missing copyright notice to pcrecpp_internal.h.
702    17. Make it more clear in the documentation that values returned from
703        pcre_exec() in ovector are byte offsets, not character counts.
705    18. Tidied a few places to stop certain compilers from issuing warnings.
707    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
708        supplied by Stefan Weber. I made a further small update for 7.8 because
709        there is a change of source arrangements: the pcre_searchfuncs.c module is
710        replaced by pcre_ucd.c.
713    Version 7.7 07-May-08
714    ---------------------
716    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
717        a string to a long long, pretend we don't even have a long long." This is
718        done by checking for the strtoq, strtoll, and _strtoi64 functions.
720    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
721        pre-7.6 versions, which defined a global no_arg variable instead of putting
722        it in the RE class. (See also #8 below.)
724    3.  Remove a line of dead code, identified by coverity and reported by Nuno
725        Lopes.
727    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
729        (1) The include/exclude patterns were being applied to the whole pathnames
730            of files, instead of just to the final components.
732        (2) If there was more than one level of directory, the subdirectories were
733            skipped unless they satisfied the include/exclude conditions. This is
734            inconsistent with GNU grep (and could even be seen as contrary to the
735            pcregrep specification - which I improved to make it absolutely clear).
736            The action now is always to scan all levels of directory, and just
737            apply the include/exclude patterns to regular files.
739    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
740        --exclude_dir in the tests to avoid scanning .svn directories.
742    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
743        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
744        doesn't support NULs in patterns.
746    7.  Added some missing "const"s to declarations of static tables in
747        pcre_compile.c and pcre_dfa_exec.c.
749    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
750        caused by fix #2  above. (Subsequently also a second patch to fix the
751        first patch. And a third patch - this was a messy problem.)
753    9.  Applied Craig's patch to remove the use of push_back().
755    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
756        matching function regexec().
758    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
759        which, however, unlike Perl's \g{...}, are subroutine calls, not back
760        references. PCRE supports relative numbers with this syntax (I don't think
761        Oniguruma does).
763    12. Previously, a group with a zero repeat such as (...){0} was completely
764        omitted from the compiled regex. However, this means that if the group
765        was called as a subroutine from elsewhere in the pattern, things went wrong
766        (an internal error was given). Such groups are now left in the compiled
767        pattern, with a new opcode that causes them to be skipped at execution
768        time.
770    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
771        to the way PCRE behaves:
773        (a) A lone ] character is dis-allowed (Perl treats it as data).
775        (b) A back reference to an unmatched subpattern matches an empty string
776            (Perl fails the current match path).
778        (c) A data ] in a character class must be notated as \] because if the
779            first data character in a class is ], it defines an empty class. (In
780            Perl it is not possible to have an empty class.) The empty class []
781            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
782            The negative empty class [^] matches any one character, independently
783            of the DOTALL setting.
785    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
786        non-existent subpattern following a character class starting with ']' and
787        containing () gave an internal compiling error instead of "reference to
788        non-existent subpattern". Fortunately, when the pattern did exist, the
789        compiled code was correct. (When scanning forwards to check for the
790        existencd of the subpattern, it was treating the data ']' as terminating
791        the class, so got the count wrong. When actually compiling, the reference
792        was subsequently set up correctly.)
794    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
795        it was being rejected as not supported by pcre_dfa_exec(), even though
796        other assertions are supported. I have made pcre_dfa_exec() support
797        (*FAIL).
799    16. The implementation of 13c above involved the invention of a new opcode,
800        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
801        cannot be changed at match time, I realized I could make a small
802        improvement to matching performance by compiling OP_ALLANY instead of
803        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
804        on the OP_ANY path.
806    17. Compiling pcretest on Windows with readline support failed without the
807        following two fixes: (1) Make the unistd.h include conditional on
808        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
810    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
811        ncurses library to be included for pcretest when ReadLine support is
812        requested, but also to allow for it to be overridden. This patch came from
813        Daniel Bergström.
815    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
816        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
817        any errors with the current Unicode tables. Thanks to Peter Kankowski for
818        spotting this.
821    Version 7.6 28-Jan-08
822    ---------------------
824    1.  A character class containing a very large number of characters with
825        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
826        overflow.
828    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
829        HAVE_LONG_LONG is not defined.
831    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
832        bring them up to date and include new features. This patch includes:
834        - Fixed PH's badly added libz and libbz2 support.
835        - Fixed a problem with static linking.
836        - Added pcredemo. [But later removed - see 7 below.]
837        - Fixed dftables problem and added an option.
838        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
839            HAVE_LONG_LONG.
840        - Added readline support for pcretest.
841        - Added an listing of the option settings after cmake has run.
843    4.  A user submitted a patch to Makefile that makes it easy to create
844        "pcre.dll" under mingw when using Configure/Make. I added stuff to
845        Makefile.am that cause it to include this special target, without
846        affecting anything else. Note that the same mingw target plus all
847        the other distribution libraries and programs are now supported
848        when configuring with CMake (see 6 below) instead of with
849        Configure/Make.
851    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
852        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
853        exported in the Windows port". It has not yet been confirmed that the patch
854        solves the problem, but it does no harm.
856    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
857        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
858        with CMake, and also correct the comment about stack recursion.
860    7.  Remove the automatic building of pcredemo from the ./configure system and
861        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
862        of a program that users should build themselves after PCRE is installed, so
863        building it automatically is not really right. What is more, it gave
864        trouble in some build environments.
866    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
869    Version 7.5 10-Jan-08
870    ---------------------
872    1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
873        values in parens when parsing an RE using the C++ wrapper."
875    2.  Negative specials like \S did not work in character classes in UTF-8 mode.
876        Characters greater than 255 were excluded from the class instead of being
877        included.
879    3.  The same bug as (2) above applied to negated POSIX classes such as
880        [:^space:].
882    4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
883        defined or documented. It seems to have been a typo for PCRE_STATIC, so
884        I have changed it.
886    5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
887        first named subpattern) and a construct such as (?&a) would reference the
888        first named subpattern whose name started with "a" (in other words, the
889        length check was missing). Both these problems are fixed. "Subpattern name
890        expected" is now given for (?&) (a zero-length name), and this patch also
891        makes it give the same error for \k'' (previously it complained that that
892        was a reference to a non-existent subpattern).
894    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
895        this is right because (?- can be followed by option settings as well as by
896        digits. I have, however, made the messages clearer.
898    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
899        than the number used in the conditional) now cause a compile-time error.
900        This is actually not compatible with Perl, which accepts such patterns, but
901        treats the conditional as always being FALSE (as PCRE used to), but it
902        seems to me that giving a diagnostic is better.
904    8.  Change "alphameric" to the more common word "alphanumeric" in comments
905        and messages.
907    9.  Fix two occurrences of "backslash" in comments that should have been
908        "backspace".
910    10. Remove two redundant lines of code that can never be obeyed (their function
911        was moved elsewhere).
913    11. The program that makes PCRE's Unicode character property table had a bug
914        which caused it to generate incorrect table entries for sequences of
915        characters that have the same character type, but are in different scripts.
916        It amalgamated them into a single range, with the script of the first of
917        them. In other words, some characters were in the wrong script. There were
918        thirteen such cases, affecting characters in the following ranges:
920          U+002b0 - U+002c1
921          U+0060c - U+0060d
922          U+0061e - U+00612
923          U+0064b - U+0065e
924          U+0074d - U+0076d
925          U+01800 - U+01805
926          U+01d00 - U+01d77
927          U+01d9b - U+01dbf
928          U+0200b - U+0200f
929          U+030fc - U+030fe
930          U+03260 - U+0327f
931          U+0fb46 - U+0fbb1
932          U+10450 - U+1049d
934    12. The -o option (show only the matching part of a line) for pcregrep was not
935        compatible with GNU grep in that, if there was more than one match in a
936        line, it showed only the first of them. It now behaves in the same way as
937        GNU grep.
939    13. If the -o and -v options were combined for pcregrep, it printed a blank
940        line for every non-matching line. GNU grep prints nothing, and pcregrep now
941        does the same. The return code can be used to tell if there were any
942        non-matching lines.
944    14. Added --file-offsets and --line-offsets to pcregrep.
946    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
947        infinitely looping recursion. The bug was that positive lookaheads were not
948        being skipped when checking for a possible empty match (negative lookaheads
949        and both kinds of lookbehind were skipped).
951    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
952        inclusion of <windows.h> to before rather than after the definition of
953        INVALID_FILE_ATTRIBUTES (patch from David Byron).
955    17. Specifying a possessive quantifier with a specific limit for a Unicode
956        character property caused pcre_compile() to compile bad code, which led at
957        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
958        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
959        caused the error; without that there was no problem.
961    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
963    19. Added --enable-pcretest-libreadline.
965    20. In pcrecpp.cc, the variable 'count' was incremented twice in
966        RE::GlobalReplace(). As a result, the number of replacements returned was
967        double what it should be. I removed one of the increments, but Craig sent a
968        later patch that removed the other one (the right fix) and added unit tests
969        that check the return values (which was not done before).
971    21. Several CMake things:
973        (1) Arranged that, when cmake is used on Unix, the libraries end up with
974            the names libpcre and libpcreposix, not just pcre and pcreposix.
976        (2) The above change means that pcretest and pcregrep are now correctly
977            linked with the newly-built libraries, not previously installed ones.
981    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
982        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
983        UTF-8 newline character). The key issue is that the pattern starts .*;
984        this means that the match must be either at the beginning, or after a
985        newline. The bug was in the code for advancing after a failed match and
986        checking that the new position followed a newline. It was not taking
987        account of UTF-8 characters correctly.
989    23. PCRE was behaving differently from Perl in the way it recognized POSIX
990        character classes. PCRE was not treating the sequence [:...:] as a
991        character class unless the ... were all letters. Perl, however, seems to
992        allow any characters between [: and :], though of course it rejects as
993        unknown any "names" that contain non-letters, because all the known class
994        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
995        for example, whereas PCRE did not - it did not recognize a POSIX character
996        class. This seemed a bit dangerous, so the code has been changed to be
997        closer to Perl. The behaviour is not identical to Perl, because PCRE will
998        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
999        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
1000        Perl does, and where it didn't before.
1002    24. Rewrite so as to remove the single use of %n from pcregrep because in some
1003        Windows environments %n is disabled by default.
1006    Version 7.4 21-Sep-07
1007  ---------------------  ---------------------
1009  1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This  1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This
# Line 32  Version 7.4 10-Sep-07 Line 1034  Version 7.4 10-Sep-07
1034      compatibility, even though it is no longer used.      compatibility, even though it is no longer used.
1036  7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and  7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and
1037      strtoull to pcrecpp.cc to select the available functions in WIN32 when the      strtoull to pcrecpp.cc to select the available functions in WIN32 when the
1038      windows.h file is present (where different names are used).      windows.h file is present (where different names are used). [This was
1039        reversed later after testing - see 16 below.]
1041  8.  Changed all #include <config.h> to #include "config.h". There were also  8.  Changed all #include <config.h> to #include "config.h". There were also
1042      some further <pcre.h> cases that I changed to "pcre.h".      some further <pcre.h> cases that I changed to "pcre.h".
# Line 63  Version 7.4 10-Sep-07 Line 1066  Version 7.4 10-Sep-07
1066  13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously  13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously
1067      checked only for CRLF.      checked only for CRLF.
1069    14. Added casts to pcretest.c to avoid compiler warnings.
1071    15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
1073    16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
1074        and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
1075        entirely. This removes changes made in 7 above.
1077    17. The CMake files have been updated, and there is now more information about
1078        building with CMake in the NON-UNIX-USE document.
1081  Version 7.3 28-Aug-07  Version 7.3 28-Aug-07
1082  ---------------------  ---------------------

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