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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 7.5 12-Nov-07  Version 8.10 03 May-2010
5    ------------------------
7    1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
8        THEN.
10    2.  (*ACCEPT) was not working when inside an atomic group.
12    3.  Inside a character class, \B is treated as a literal by default, but
13        faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
14        causes the error). The code is unchanged, but I tidied the documentation.
16    4.  Inside a character class, PCRE always treated \R and \X as literals,
17        whereas Perl faults them if its -w option is set. I have changed PCRE so
18        that it faults them when PCRE_EXTRA is set.
20    5.  Added support for \N, which always matches any character other than
21        newline. (It is the same as "." when PCRE_DOTALL is not set.)
23    6.  When compiling pcregrep with newer versions of gcc which may have
24        FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
25        declared with attribute warn_unused_result" were given. Just casting the
26        result to (void) does not stop the warnings; a more elaborate fudge is
27        needed. I've used a macro to implement this.
29    7.  Minor change to pcretest.c to avoid a compiler warning.
31    8.  Added four artifical Unicode properties to help with an option to make
32        \s etc use properties. The new properties are: Xan (alphanumeric), Xsp
33        (Perl space), Xps (POSIX space), and Xwd (word).
36    Version 8.02 19-Mar-2010
37    ------------------------
39    1.  The Unicode data tables have been updated to Unicode 5.2.0.
41    2.  Added the option --libs-cpp to pcre-config, but only when C++ support is
42        configured.
44    3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the
45        original author of that file, following a query about its status.
47    4.  On systems that do not have stdint.h (e.g. Solaris), check for and include
48        inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.
50    5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
51        quantifier applied to a forward-referencing subroutine call, could compile
52        incorrect code or give the error "internal error: previously-checked
53        referenced subpattern not found".
55    6.  Both MS Visual Studio and Symbian OS have problems with initializing
56        variables to point to external functions. For these systems, therefore,
57        pcre_malloc etc. are now initialized to local functions that call the
58        relevant global functions.
60    7.  There were two entries missing in the vectors called coptable and poptable
61        in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.
62        I've fixed the data, and added a kludgy way of testing at compile time that
63        the lengths are correct (equal to the number of opcodes).
65    8.  Following on from 7, I added a similar kludge to check the length of the
66        eint vector in pcreposix.c.
68    9.  Error texts for pcre_compile() are held as one long string to avoid too
69        much relocation at load time. To find a text, the string is searched,
70        counting zeros. There was no check for running off the end of the string,
71        which could happen if a new error number was added without updating the
72        string.
74    10. \K gave a compile-time error if it appeared in a lookbehind assersion.
76    11. \K was not working if it appeared in an atomic group or in a group that
77        was called as a "subroutine", or in an assertion. Perl 5.11 documents that
78        \K is "not well defined" if used in an assertion. PCRE now accepts it if
79        the assertion is positive, but not if it is negative.
81    12. Change 11 fortuitously reduced the size of the stack frame used in the
82        "match()" function of pcre_exec.c by one pointer. Forthcoming
83        implementation of support for (*MARK) will need an extra pointer on the
84        stack; I have reserved it now, so that the stack frame size does not
85        decrease.
87    13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other
88        item in branch that calls a recursion is a subroutine call - as in the
89        second branch in the above example - was incorrectly given the compile-
90        time error "recursive call could loop indefinitely" because pcre_compile()
91        was not correctly checking the subroutine for matching a non-empty string.
93    14. The checks for overrunning compiling workspace could trigger after an
94        overrun had occurred. This is a "should never occur" error, but it can be
95        triggered by pathological patterns such as hundreds of nested parentheses.
96        The checks now trigger 100 bytes before the end of the workspace.
98    15. Fix typo in configure.ac: "srtoq" should be "strtoq".
101    Version 8.01 19-Jan-2010
102    ------------------------
104    1.  If a pattern contained a conditional subpattern with only one branch (in
105        particular, this includes all (*DEFINE) patterns), a call to pcre_study()
106        computed the wrong minimum data length (which is of course zero for such
107        subpatterns). This could cause incorrect "no match" results.
109    2.  For patterns such as (?i)a(?-i)b|c where an option setting at the start of
110        the pattern is reset in the first branch, pcre_compile() failed with
111        "internal error: code overflow at offset...". This happened only when
112        the reset was to the original external option setting. (An optimization
113        abstracts leading options settings into an external setting, which was the
114        cause of this.)
116    3.  A pattern such as ^(?!a(*SKIP)b) where a negative assertion contained one
117        of the verbs SKIP, PRUNE, or COMMIT, did not work correctly. When the
118        assertion pattern did not match (meaning that the assertion was true), it
119        was incorrectly treated as false if the SKIP had been reached during the
120        matching. This also applied to assertions used as conditions.
122    4.  If an item that is not supported by pcre_dfa_exec() was encountered in an
123        assertion subpattern, including such a pattern used as a condition,
124        unpredictable results occurred, instead of the error return
127    5.  The C++ GlobalReplace function was not working like Perl for the special
128        situation when an empty string is matched. It now does the fancy magic
129        stuff that is necessary.
131    6.  In pcre_internal.h, obsolete includes to setjmp.h and stdarg.h have been
132        removed. (These were left over from very, very early versions of PCRE.)
134    7.  Some cosmetic changes to the code to make life easier when compiling it
135        as part of something else:
137        (a) Change DEBUG to PCRE_DEBUG.
139        (b) In pcre_compile(), rename the member of the "branch_chain" structure
140            called "current" as "current_branch", to prevent a collision with the
141            Linux macro when compiled as a kernel module.
143        (c) In pcre_study(), rename the function set_bit() as set_table_bit(), to
144            prevent a collision with the Linux macro when compiled as a kernel
145            module.
147    8.  In pcre_compile() there are some checks for integer overflows that used to
148        cast potentially large values to (double). This has been changed to that
149        when building, a check for int64_t is made, and if it is found, it is used
150        instead, thus avoiding the use of floating point arithmetic. (There is no
151        other use of FP in PCRE.) If int64_t is not found, the fallback is to
152        double.
154    9.  Added two casts to avoid signed/unsigned warnings from VS Studio Express
155        2005 (difference between two addresses compared to an unsigned value).
157    10. Change the standard AC_CHECK_LIB test for libbz2 in configure.ac to a
158        custom one, because of the following reported problem in Windows:
160          - libbz2 uses the Pascal calling convention (WINAPI) for the functions
161              under Win32.
162          - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",
163              therefore missing the function definition.
164          - The compiler thus generates a "C" signature for the test function.
165          - The linker fails to find the "C" function.
166          - PCRE fails to configure if asked to do so against libbz2.
168    11. When running libtoolize from libtool-2.2.6b as part of autogen.sh, these
169        messages were output:
171          Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and
172          rerunning libtoolize, to keep the correct libtool macros in-tree.
173          Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
175        I have done both of these things.
177    12. Although pcre_dfa_exec() does not use nearly as much stack as pcre_exec()
178        most of the time, it *can* run out if it is given a pattern that contains a
179        runaway infinite recursion. I updated the discussion in the pcrestack man
180        page.
182    13. Now that we have gone to the x.xx style of version numbers, the minor
183        version may start with zero. Using 08 or 09 is a bad idea because users
184        might check the value of PCRE_MINOR in their code, and 08 or 09 may be
185        interpreted as invalid octal numbers. I've updated the previous comment in
186        configure.ac, and also added a check that gives an error if 08 or 09 are
187        used.
189    14. Change 8.00/11 was not quite complete: code had been accidentally omitted,
190        causing partial matching to fail when the end of the subject matched \W
191        in a UTF-8 pattern where \W was quantified with a minimum of 3.
193    15. There were some discrepancies between the declarations in pcre_internal.h
194        of _pcre_is_newline(), _pcre_was_newline(), and _pcre_valid_utf8() and
195        their definitions. The declarations used "const uschar *" and the
196        definitions used USPTR. Even though USPTR is normally defined as "const
197        unsigned char *" (and uschar is typedeffed as "unsigned char"), it was
198        reported that: "This difference in casting confuses some C++ compilers, for
199        example, SunCC recognizes above declarations as different functions and
200        generates broken code for hbpcre." I have changed the declarations to use
201        USPTR.
203    16. GNU libtool is named differently on some systems. The autogen.sh script now
204        tries several variants such as glibtoolize (MacOSX) and libtoolize1x
205        (FreeBSD).
207    17. Applied Craig's patch that fixes an HP aCC compile error in pcre 8.00
208        (strtoXX undefined when compiling pcrecpp.cc). The patch contains this
209        comment: "Figure out how to create a longlong from a string: strtoll and
210        equivalent. It's not enough to call AC_CHECK_FUNCS: hpux has a strtoll, for
211        instance, but it only takes 2 args instead of 3!"
213    18. A subtle bug concerned with back references has been fixed by a change of
214        specification, with a corresponding code fix. A pattern such as
215        ^(xa|=?\1a)+$ which contains a back reference inside the group to which it
216        refers, was giving matches when it shouldn't. For example, xa=xaaa would
217        match that pattern. Interestingly, Perl (at least up to 5.11.3) has the
218        same bug. Such groups have to be quantified to be useful, or contained
219        inside another quantified group. (If there's no repetition, the reference
220        can never match.) The problem arises because, having left the group and
221        moved on to the rest of the pattern, a later failure that backtracks into
222        the group uses the captured value from the final iteration of the group
223        rather than the correct earlier one. I have fixed this in PCRE by forcing
224        any group that contains a reference to itself to be an atomic group; that
225        is, there cannot be any backtracking into it once it has completed. This is
226        similar to recursive and subroutine calls.
229    Version 8.00 19-Oct-09
230    ----------------------
232    1.  The table for translating pcre_compile() error codes into POSIX error codes
233        was out-of-date, and there was no check on the pcre_compile() error code
234        being within the table. This could lead to an OK return being given in
235        error.
237    2.  Changed the call to open a subject file in pcregrep from fopen(pathname,
238        "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
239        in a Windows environment.
241    3.  The pcregrep --count option prints the count for each file even when it is
242        zero, as does GNU grep. However, pcregrep was also printing all files when
243        --files-with-matches was added. Now, when both options are given, it prints
244        counts only for those files that have at least one match. (GNU grep just
245        prints the file name in this circumstance, but including the count seems
246        more useful - otherwise, why use --count?) Also ensured that the
247        combination -clh just lists non-zero counts, with no names.
249    4.  The long form of the pcregrep -F option was incorrectly implemented as
250        --fixed_strings instead of --fixed-strings. This is an incompatible change,
251        but it seems right to fix it, and I didn't think it was worth preserving
252        the old behaviour.
254    5.  The command line items --regex=pattern and --regexp=pattern were not
255        recognized by pcregrep, which required --regex pattern or --regexp pattern
256        (with a space rather than an '='). The man page documented the '=' forms,
257        which are compatible with GNU grep; these now work.
259    6.  No libpcreposix.pc file was created for pkg-config; there was just
260        libpcre.pc and libpcrecpp.pc. The omission has been rectified.
262    7.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
263        when UCP support is not needed, by modifying the Python script that
264        generates it from Unicode data files. This should not matter if the module
265        is correctly used as a library, but I received one complaint about 50K of
266        unwanted data. My guess is that the person linked everything into his
267        program rather than using a library. Anyway, it does no harm.
269    8.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
270        was a minimum greater than 1 for a wide character in a possessive
271        repetition. The same bug could also affect patterns like /(\x{ff}{0,2})*/8
272        which had an unlimited repeat of a nested, fixed maximum repeat of a wide
273        character. Chaos in the form of incorrect output or a compiling loop could
274        result.
276    9.  The restrictions on what a pattern can contain when partial matching is
277        requested for pcre_exec() have been removed. All patterns can now be
278        partially matched by this function. In addition, if there are at least two
279        slots in the offset vector, the offset of the earliest inspected character
280        for the match and the offset of the end of the subject are set in them when
281        PCRE_ERROR_PARTIAL is returned.
283    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
284        synonymous with PCRE_PARTIAL, for backwards compatibility, and
285        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
286        and may be more useful for multi-segment matching.
288    11. Partial matching with pcre_exec() is now more intuitive. A partial match
289        used to be given if ever the end of the subject was reached; now it is
290        given only if matching could not proceed because another character was
291        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
292        string "Z", which now yields "no match" instead of "partial match". In the
293        case of pcre_dfa_exec(), "no match" is given if every matching path for the
294        final character ended with (*FAIL).
296    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
297        if the pattern had a "must contain" character that was already found in the
298        earlier partial match, unless partial matching was again requested. For
299        example, with the pattern /dog.(body)?/, the "must contain" character is
300        "g". If the first part-match was for the string "dog", restarting with
301        "sbody" failed. This bug has been fixed.
303    13. The string returned by pcre_dfa_exec() after a partial match has been
304        changed so that it starts at the first inspected character rather than the
305        first character of the match. This makes a difference only if the pattern
306        starts with a lookbehind assertion or \b or \B (\K is not supported by
307        pcre_dfa_exec()). It's an incompatible change, but it makes the two
308        matching functions compatible, and I think it's the right thing to do.
310    14. Added a pcredemo man page, created automatically from the pcredemo.c file,
311        so that the demonstration program is easily available in environments where
312        PCRE has not been installed from source.
314    15. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
315        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
316        library.
318    16. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
319        It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
320        is not the first non-POSIX option to be added. Clearly some people find
321        these options useful.
323    17. If a caller to the POSIX matching function regexec() passes a non-zero
324        value for nmatch with a NULL value for pmatch, the value of
325        nmatch is forced to zero.
327    18. RunGrepTest did not have a test for the availability of the -u option of
328        the diff command, as RunTest does. It now checks in the same way as
329        RunTest, and also checks for the -b option.
331    19. If an odd number of negated classes containing just a single character
332        interposed, within parentheses, between a forward reference to a named
333        subpattern and the definition of the subpattern, compilation crashed with
334        an internal error, complaining that it could not find the referenced
335        subpattern. An example of a crashing pattern is /(?&A)(([^m])(?<A>))/.
336        [The bug was that it was starting one character too far in when skipping
337        over the character class, thus treating the ] as data rather than
338        terminating the class. This meant it could skip too much.]
340    20. Added PCRE_NOTEMPTY_ATSTART in order to be able to correctly implement the
341        /g option in pcretest when the pattern contains \K, which makes it possible
342        to have an empty string match not at the start, even when the pattern is
343        anchored. Updated pcretest and pcredemo to use this option.
345    21. If the maximum number of capturing subpatterns in a recursion was greater
346        than the maximum at the outer level, the higher number was returned, but
347        with unset values at the outer level. The correct (outer level) value is
348        now given.
350    22. If (*ACCEPT) appeared inside capturing parentheses, previous releases of
351        PCRE did not set those parentheses (unlike Perl). I have now found a way to
352        make it do so. The string so far is captured, making this feature
353        compatible with Perl.
355    23. The tests have been re-organized, adding tests 11 and 12, to make it
356        possible to check the Perl 5.10 features against Perl 5.10.
358    24. Perl 5.10 allows subroutine calls in lookbehinds, as long as the subroutine
359        pattern matches a fixed length string. PCRE did not allow this; now it
360        does. Neither allows recursion.
362    25. I finally figured out how to implement a request to provide the minimum
363        length of subject string that was needed in order to match a given pattern.
364        (It was back references and recursion that I had previously got hung up
365        on.) This code has now been added to pcre_study(); it finds a lower bound
366        to the length of subject needed. It is not necessarily the greatest lower
367        bound, but using it to avoid searching strings that are too short does give
368        some useful speed-ups. The value is available to calling programs via
369        pcre_fullinfo().
371    26. While implementing 25, I discovered to my embarrassment that pcretest had
372        not been passing the result of pcre_study() to pcre_dfa_exec(), so the
373        study optimizations had never been tested with that matching function.
374        Oops. What is worse, even when it was passed study data, there was a bug in
375        pcre_dfa_exec() that meant it never actually used it. Double oops. There
376        were also very few tests of studied patterns with pcre_dfa_exec().
378    27. If (?| is used to create subpatterns with duplicate numbers, they are now
379        allowed to have the same name, even if PCRE_DUPNAMES is not set. However,
380        on the other side of the coin, they are no longer allowed to have different
381        names, because these cannot be distinguished in PCRE, and this has caused
382        confusion. (This is a difference from Perl.)
384    28. When duplicate subpattern names are present (necessarily with different
385        numbers, as required by 27 above), and a test is made by name in a
386        conditional pattern, either for a subpattern having been matched, or for
387        recursion in such a pattern, all the associated numbered subpatterns are
388        tested, and the overall condition is true if the condition is true for any
389        one of them. This is the way Perl works, and is also more like the way
390        testing by number works.
393    Version 7.9 11-Apr-09
394    ---------------------
396    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
397        (pcretest), all targets were linked against these libraries. This included
398        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
399        libraries. This caused unwanted dependencies to be created. This problem
400        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
401        pcretest is linked with readline.
403    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
404        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
405        moved outside it again, because FALSE and TRUE are already defined in AIX,
406        but BOOL is not.
408    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
409        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
411    4.  The pcregrep documentation said spaces were inserted as well as colons (or
412        hyphens) following file names and line numbers when outputting matching
413        lines. This is not true; no spaces are inserted. I have also clarified the
414        wording for the --colour (or --color) option.
416    5.  In pcregrep, when --colour was used with -o, the list of matching strings
417        was not coloured; this is different to GNU grep, so I have changed it to be
418        the same.
420    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
421        each matching line was coloured. Now it goes on to look for further matches
422        of any of the test patterns, which is the same behaviour as GNU grep.
424    7.  A pattern that could match an empty string could cause pcregrep to loop; it
425        doesn't make sense to accept an empty string match in pcregrep, so I have
426        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
427        seems to be how GNU grep behaves.
429    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
430        start or after a newline", because the conditional assertion was not being
431        correctly handled. The rule now is that both the assertion and what follows
432        in the first alternative must satisfy the test.
434    9.  If auto-callout was enabled in a pattern with a conditional group whose
435        condition was an assertion, PCRE could crash during matching, both with
436        pcre_exec() and pcre_dfa_exec().
438    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
439        used for matching.
441    11. Unicode property support in character classes was not working for
442        characters (bytes) greater than 127 when not in UTF-8 mode.
444    12. Added the -M command line option to pcretest.
446    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
448    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
450    16. Added comments and documentation about mis-use of no_arg in the C++
451        wrapper.
453    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
454        from Martin Jerabek that uses macro names for all relevant character and
455        string constants.
457    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
458        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
459        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
460        these, but not everybody uses configure.
462    19. A conditional group that had only one branch was not being correctly
463        recognized as an item that could match an empty string. This meant that an
464        enclosing group might also not be so recognized, causing infinite looping
465        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
466        with the subject "ab", where knowledge that the repeated group can match
467        nothing is needed in order to break the loop.
469    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
470        exec(), but without supplying a callout function, matching went wrong.
472    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
473        leak if the size of the offset vector was greater than 30. When the vector
474        is smaller, the saved offsets during recursion go onto a local stack
475        vector, but for larger vectors malloc() is used. It was failing to free
476        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
477        error, in fact).
479    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
480        heapframe that is used only when UTF-8 support is enabled. This caused no
481        problem, but was untidy.
483    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
484        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
485        included within another project.
487    24. Steven Van Ingelgem's patches to add more options to the CMake support,
488        slightly modified by me:
490          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
491              not building pcregrep.
493          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
494              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
496    25. Forward references, both numeric and by name, in patterns that made use of
497        duplicate group numbers, could behave incorrectly or give incorrect errors,
498        because when scanning forward to find the reference group, PCRE was not
499        taking into account the duplicate group numbers. A pattern such as
500        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
502    26. Changed a few more instances of "const unsigned char *" to USPTR, making
503        the feature of a custom pointer more persuasive (as requested by a user).
505    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
506        pcretest.c, inside #ifndefs, because it seems they are sometimes already
507        pre-defined.
509    28. Added support for (*UTF8) at the start of a pattern.
511    29. Arrange for flags added by the "release type" setting in CMake to be shown
512        in the configuration summary.
515    Version 7.8 05-Sep-08
516    ---------------------
518    1.  Replaced UCP searching code with optimized version as implemented for Ad
519        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
520        stage table and inline lookup instead of a function, giving speed ups of 2
521        to 5 times on some simple patterns that I tested. Permission was given to
522        distribute the MultiStage2.py script that generates the tables (it's not in
523        the tarball, but is in the Subversion repository).
525    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
526        scripts.
528    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
529        a group with a zero qualifier. The result of the study could be incorrect,
530        or the function might crash, depending on the pattern.
532    4.  Caseless matching was not working for non-ASCII characters in back
533        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
534        It now works when Unicode Property Support is available.
536    5.  In pcretest, an escape such as \x{de} in the data was always generating
537        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
538        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
539        truncation.
541    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
543    7.  Added two (int) casts to pcregrep when printing the difference of two
544        pointers, in case they are 64-bit values.
546    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
547        test 2 if it fails.
549    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
550        and a #define of that name to empty if it is not externally set. This is to
551        allow users of MSVC to set it if necessary.
553    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
554        the convenience functions in the pcre_get.c source file.
556    11. An option change at the start of a pattern that had top-level alternatives
557        could cause overwriting and/or a crash. This command provoked a crash in
558        some environments:
560          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
562        This potential security problem was recorded as CVE-2008-2371.
564    12. For a pattern where the match had to start at the beginning or immediately
565        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
566        pcre_dfa_exec() could read past the end of the passed subject if there was
567        no match. To help with detecting such bugs (e.g. with valgrind), I modified
568        pcretest so that it places the subject at the end of its malloc-ed buffer.
570    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
571        exec() might read past the end of the data buffer in UTF-8 mode.
573    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
574        the data contained the byte 0x85 as part of a UTF-8 character within its
575        first line. This applied both to normal and DFA matching.
577    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
578        /^[^d]*?$/8 failed to match "abc".
580    16. Added a missing copyright notice to pcrecpp_internal.h.
582    17. Make it more clear in the documentation that values returned from
583        pcre_exec() in ovector are byte offsets, not character counts.
585    18. Tidied a few places to stop certain compilers from issuing warnings.
587    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
588        supplied by Stefan Weber. I made a further small update for 7.8 because
589        there is a change of source arrangements: the pcre_searchfuncs.c module is
590        replaced by pcre_ucd.c.
593    Version 7.7 07-May-08
594    ---------------------
596    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
597        a string to a long long, pretend we don't even have a long long." This is
598        done by checking for the strtoq, strtoll, and _strtoi64 functions.
600    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
601        pre-7.6 versions, which defined a global no_arg variable instead of putting
602        it in the RE class. (See also #8 below.)
604    3.  Remove a line of dead code, identified by coverity and reported by Nuno
605        Lopes.
607    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
609        (1) The include/exclude patterns were being applied to the whole pathnames
610            of files, instead of just to the final components.
612        (2) If there was more than one level of directory, the subdirectories were
613            skipped unless they satisfied the include/exclude conditions. This is
614            inconsistent with GNU grep (and could even be seen as contrary to the
615            pcregrep specification - which I improved to make it absolutely clear).
616            The action now is always to scan all levels of directory, and just
617            apply the include/exclude patterns to regular files.
619    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
620        --exclude_dir in the tests to avoid scanning .svn directories.
622    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
623        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
624        doesn't support NULs in patterns.
626    7.  Added some missing "const"s to declarations of static tables in
627        pcre_compile.c and pcre_dfa_exec.c.
629    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
630        caused by fix #2  above. (Subsequently also a second patch to fix the
631        first patch. And a third patch - this was a messy problem.)
633    9.  Applied Craig's patch to remove the use of push_back().
635    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
636        matching function regexec().
638    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
639        which, however, unlike Perl's \g{...}, are subroutine calls, not back
640        references. PCRE supports relative numbers with this syntax (I don't think
641        Oniguruma does).
643    12. Previously, a group with a zero repeat such as (...){0} was completely
644        omitted from the compiled regex. However, this means that if the group
645        was called as a subroutine from elsewhere in the pattern, things went wrong
646        (an internal error was given). Such groups are now left in the compiled
647        pattern, with a new opcode that causes them to be skipped at execution
648        time.
650    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
651        to the way PCRE behaves:
653        (a) A lone ] character is dis-allowed (Perl treats it as data).
655        (b) A back reference to an unmatched subpattern matches an empty string
656            (Perl fails the current match path).
658        (c) A data ] in a character class must be notated as \] because if the
659            first data character in a class is ], it defines an empty class. (In
660            Perl it is not possible to have an empty class.) The empty class []
661            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
662            The negative empty class [^] matches any one character, independently
663            of the DOTALL setting.
665    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
666        non-existent subpattern following a character class starting with ']' and
667        containing () gave an internal compiling error instead of "reference to
668        non-existent subpattern". Fortunately, when the pattern did exist, the
669        compiled code was correct. (When scanning forwards to check for the
670        existencd of the subpattern, it was treating the data ']' as terminating
671        the class, so got the count wrong. When actually compiling, the reference
672        was subsequently set up correctly.)
674    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
675        it was being rejected as not supported by pcre_dfa_exec(), even though
676        other assertions are supported. I have made pcre_dfa_exec() support
677        (*FAIL).
679    16. The implementation of 13c above involved the invention of a new opcode,
680        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
681        cannot be changed at match time, I realized I could make a small
682        improvement to matching performance by compiling OP_ALLANY instead of
683        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
684        on the OP_ANY path.
686    17. Compiling pcretest on Windows with readline support failed without the
687        following two fixes: (1) Make the unistd.h include conditional on
688        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
690    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
691        ncurses library to be included for pcretest when ReadLine support is
692        requested, but also to allow for it to be overridden. This patch came from
693        Daniel Bergström.
695    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
696        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
697        any errors with the current Unicode tables. Thanks to Peter Kankowski for
698        spotting this.
701    Version 7.6 28-Jan-08
702    ---------------------
704    1.  A character class containing a very large number of characters with
705        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
706        overflow.
708    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
709        HAVE_LONG_LONG is not defined.
711    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
712        bring them up to date and include new features. This patch includes:
714        - Fixed PH's badly added libz and libbz2 support.
715        - Fixed a problem with static linking.
716        - Added pcredemo. [But later removed - see 7 below.]
717        - Fixed dftables problem and added an option.
718        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
719            HAVE_LONG_LONG.
720        - Added readline support for pcretest.
721        - Added an listing of the option settings after cmake has run.
723    4.  A user submitted a patch to Makefile that makes it easy to create
724        "pcre.dll" under mingw when using Configure/Make. I added stuff to
725        Makefile.am that cause it to include this special target, without
726        affecting anything else. Note that the same mingw target plus all
727        the other distribution libraries and programs are now supported
728        when configuring with CMake (see 6 below) instead of with
729        Configure/Make.
731    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
732        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
733        exported in the Windows port". It has not yet been confirmed that the patch
734        solves the problem, but it does no harm.
736    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
737        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
738        with CMake, and also correct the comment about stack recursion.
740    7.  Remove the automatic building of pcredemo from the ./configure system and
741        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
742        of a program that users should build themselves after PCRE is installed, so
743        building it automatically is not really right. What is more, it gave
744        trouble in some build environments.
746    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
749    Version 7.5 10-Jan-08
750  ---------------------  ---------------------
752  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'
753      values in parens when parsing an RE using the C++ wrapper."      values in parens when parsing an RE using the C++ wrapper."
755  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.
756      Characters greater than 255 were excluded from the class instead of being      Characters greater than 255 were excluded from the class instead of being
757      included.      included.
759  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
760      [:^space:].      [:^space:].
762  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
763      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
764      I have changed it.      I have changed it.
766  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
767      first named subpattern) and a construct such as (?&a) would reference the      first named subpattern) and a construct such as (?&a) would reference the
768      first named subpattern whose name started with "a" (in other words, the      first named subpattern whose name started with "a" (in other words, the
769      length check was missing).      length check was missing). Both these problems are fixed. "Subpattern name
770        expected" is now given for (?&) (a zero-length name), and this patch also
771        makes it give the same error for \k'' (previously it complained that that
772        was a reference to a non-existent subpattern).
774    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
775        this is right because (?- can be followed by option settings as well as by
776        digits. I have, however, made the messages clearer.
778    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
779        than the number used in the conditional) now cause a compile-time error.
780        This is actually not compatible with Perl, which accepts such patterns, but
781        treats the conditional as always being FALSE (as PCRE used to), but it
782        seems to me that giving a diagnostic is better.
784    8.  Change "alphameric" to the more common word "alphanumeric" in comments
785        and messages.
787    9.  Fix two occurrences of "backslash" in comments that should have been
788        "backspace".
790    10. Remove two redundant lines of code that can never be obeyed (their function
791        was moved elsewhere).
793    11. The program that makes PCRE's Unicode character property table had a bug
794        which caused it to generate incorrect table entries for sequences of
795        characters that have the same character type, but are in different scripts.
796        It amalgamated them into a single range, with the script of the first of
797        them. In other words, some characters were in the wrong script. There were
798        thirteen such cases, affecting characters in the following ranges:
800          U+002b0 - U+002c1
801          U+0060c - U+0060d
802          U+0061e - U+00612
803          U+0064b - U+0065e
804          U+0074d - U+0076d
805          U+01800 - U+01805
806          U+01d00 - U+01d77
807          U+01d9b - U+01dbf
808          U+0200b - U+0200f
809          U+030fc - U+030fe
810          U+03260 - U+0327f
811          U+0fb46 - U+0fbb1
812          U+10450 - U+1049d
814    12. The -o option (show only the matching part of a line) for pcregrep was not
815        compatible with GNU grep in that, if there was more than one match in a
816        line, it showed only the first of them. It now behaves in the same way as
817        GNU grep.
819    13. If the -o and -v options were combined for pcregrep, it printed a blank
820        line for every non-matching line. GNU grep prints nothing, and pcregrep now
821        does the same. The return code can be used to tell if there were any
822        non-matching lines.
824    14. Added --file-offsets and --line-offsets to pcregrep.
826    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
827        infinitely looping recursion. The bug was that positive lookaheads were not
828        being skipped when checking for a possible empty match (negative lookaheads
829        and both kinds of lookbehind were skipped).
831    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
832        inclusion of <windows.h> to before rather than after the definition of
833        INVALID_FILE_ATTRIBUTES (patch from David Byron).
835    17. Specifying a possessive quantifier with a specific limit for a Unicode
836        character property caused pcre_compile() to compile bad code, which led at
837        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
838        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
839        caused the error; without that there was no problem.
841    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
843    19. Added --enable-pcretest-libreadline.
845    20. In pcrecpp.cc, the variable 'count' was incremented twice in
846        RE::GlobalReplace(). As a result, the number of replacements returned was
847        double what it should be. I removed one of the increments, but Craig sent a
848        later patch that removed the other one (the right fix) and added unit tests
849        that check the return values (which was not done before).
851    21. Several CMake things:
853        (1) Arranged that, when cmake is used on Unix, the libraries end up with
854            the names libpcre and libpcreposix, not just pcre and pcreposix.
856        (2) The above change means that pcretest and pcregrep are now correctly
857            linked with the newly-built libraries, not previously installed ones.
861    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
862        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
863        UTF-8 newline character). The key issue is that the pattern starts .*;
864        this means that the match must be either at the beginning, or after a
865        newline. The bug was in the code for advancing after a failed match and
866        checking that the new position followed a newline. It was not taking
867        account of UTF-8 characters correctly.
869    23. PCRE was behaving differently from Perl in the way it recognized POSIX
870        character classes. PCRE was not treating the sequence [:...:] as a
871        character class unless the ... were all letters. Perl, however, seems to
872        allow any characters between [: and :], though of course it rejects as
873        unknown any "names" that contain non-letters, because all the known class
874        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
875        for example, whereas PCRE did not - it did not recognize a POSIX character
876        class. This seemed a bit dangerous, so the code has been changed to be
877        closer to Perl. The behaviour is not identical to Perl, because PCRE will
878        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
879        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
880        Perl does, and where it didn't before.
882    24. Rewrite so as to remove the single use of %n from pcregrep because in some
883        Windows environments %n is disabled by default.
886  Version 7.4 21-Sep-07  Version 7.4 21-Sep-07

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