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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 7.6 19-Jan-08  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 (see next item). The new properties are: Xan
33        (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
35    9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
36        use Unicode properties. (*UCP) at the start of a pattern can be used to set
37        this option. Modified pcretest to add /W to test this facility. Added
38        REG_UCP to make it available via the POSIX interface.
40    10. Added --line-buffered to pcregrep.
42    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
43        studied, and the match started with a letter with a code point greater than
44        127 whose first byte was different to the first byte of the other case of
45        the letter, the other case of this starting letter was not recognized.
47    12. pcreposix.c included pcre.h before including pcre_internal.h. This caused a
48        conflict in the definition of PCRE_EXP_DECL. I have removed the include of
49        pcre.h as pcre_internal.h includes pcre.h itself. (This may be a bit of
50        historical tidying that never got done.)
52    13. If a pattern that was studied started with a repeated Unicode property
53        test, for example, \p{Nd}+, there was the theoretical possibility of
54        setting up an incorrect bitmap of starting bytes, but fortunately it could
55        not have actually happened in practice until change 8 above was made (it
56        added property types that matched character-matching opcodes).
58    14. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
59        possible starting bytes for non-anchored patterns.
61    15. The "auto-possessify" feature of pcre_compile() now recognizes \R.
63    16. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
64        input, it could crash or give wrong results if characters with values
65        greater than 0xc0 were present in the subject string. (Detail: it assumed
66        UTF-8 input when processing these items.)
70    Version 8.02 19-Mar-2010
71    ------------------------
73    1.  The Unicode data tables have been updated to Unicode 5.2.0.
75    2.  Added the option --libs-cpp to pcre-config, but only when C++ support is
76        configured.
78    3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the
79        original author of that file, following a query about its status.
81    4.  On systems that do not have stdint.h (e.g. Solaris), check for and include
82        inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.
84    5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
85        quantifier applied to a forward-referencing subroutine call, could compile
86        incorrect code or give the error "internal error: previously-checked
87        referenced subpattern not found".
89    6.  Both MS Visual Studio and Symbian OS have problems with initializing
90        variables to point to external functions. For these systems, therefore,
91        pcre_malloc etc. are now initialized to local functions that call the
92        relevant global functions.
94    7.  There were two entries missing in the vectors called coptable and poptable
95        in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.
96        I've fixed the data, and added a kludgy way of testing at compile time that
97        the lengths are correct (equal to the number of opcodes).
99    8.  Following on from 7, I added a similar kludge to check the length of the
100        eint vector in pcreposix.c.
102    9.  Error texts for pcre_compile() are held as one long string to avoid too
103        much relocation at load time. To find a text, the string is searched,
104        counting zeros. There was no check for running off the end of the string,
105        which could happen if a new error number was added without updating the
106        string.
108    10. \K gave a compile-time error if it appeared in a lookbehind assersion.
110    11. \K was not working if it appeared in an atomic group or in a group that
111        was called as a "subroutine", or in an assertion. Perl 5.11 documents that
112        \K is "not well defined" if used in an assertion. PCRE now accepts it if
113        the assertion is positive, but not if it is negative.
115    12. Change 11 fortuitously reduced the size of the stack frame used in the
116        "match()" function of pcre_exec.c by one pointer. Forthcoming
117        implementation of support for (*MARK) will need an extra pointer on the
118        stack; I have reserved it now, so that the stack frame size does not
119        decrease.
121    13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other
122        item in branch that calls a recursion is a subroutine call - as in the
123        second branch in the above example - was incorrectly given the compile-
124        time error "recursive call could loop indefinitely" because pcre_compile()
125        was not correctly checking the subroutine for matching a non-empty string.
127    14. The checks for overrunning compiling workspace could trigger after an
128        overrun had occurred. This is a "should never occur" error, but it can be
129        triggered by pathological patterns such as hundreds of nested parentheses.
130        The checks now trigger 100 bytes before the end of the workspace.
132    15. Fix typo in configure.ac: "srtoq" should be "strtoq".
135    Version 8.01 19-Jan-2010
136    ------------------------
138    1.  If a pattern contained a conditional subpattern with only one branch (in
139        particular, this includes all (*DEFINE) patterns), a call to pcre_study()
140        computed the wrong minimum data length (which is of course zero for such
141        subpatterns). This could cause incorrect "no match" results.
143    2.  For patterns such as (?i)a(?-i)b|c where an option setting at the start of
144        the pattern is reset in the first branch, pcre_compile() failed with
145        "internal error: code overflow at offset...". This happened only when
146        the reset was to the original external option setting. (An optimization
147        abstracts leading options settings into an external setting, which was the
148        cause of this.)
150    3.  A pattern such as ^(?!a(*SKIP)b) where a negative assertion contained one
151        of the verbs SKIP, PRUNE, or COMMIT, did not work correctly. When the
152        assertion pattern did not match (meaning that the assertion was true), it
153        was incorrectly treated as false if the SKIP had been reached during the
154        matching. This also applied to assertions used as conditions.
156    4.  If an item that is not supported by pcre_dfa_exec() was encountered in an
157        assertion subpattern, including such a pattern used as a condition,
158        unpredictable results occurred, instead of the error return
161    5.  The C++ GlobalReplace function was not working like Perl for the special
162        situation when an empty string is matched. It now does the fancy magic
163        stuff that is necessary.
165    6.  In pcre_internal.h, obsolete includes to setjmp.h and stdarg.h have been
166        removed. (These were left over from very, very early versions of PCRE.)
168    7.  Some cosmetic changes to the code to make life easier when compiling it
169        as part of something else:
171        (a) Change DEBUG to PCRE_DEBUG.
173        (b) In pcre_compile(), rename the member of the "branch_chain" structure
174            called "current" as "current_branch", to prevent a collision with the
175            Linux macro when compiled as a kernel module.
177        (c) In pcre_study(), rename the function set_bit() as set_table_bit(), to
178            prevent a collision with the Linux macro when compiled as a kernel
179            module.
181    8.  In pcre_compile() there are some checks for integer overflows that used to
182        cast potentially large values to (double). This has been changed to that
183        when building, a check for int64_t is made, and if it is found, it is used
184        instead, thus avoiding the use of floating point arithmetic. (There is no
185        other use of FP in PCRE.) If int64_t is not found, the fallback is to
186        double.
188    9.  Added two casts to avoid signed/unsigned warnings from VS Studio Express
189        2005 (difference between two addresses compared to an unsigned value).
191    10. Change the standard AC_CHECK_LIB test for libbz2 in configure.ac to a
192        custom one, because of the following reported problem in Windows:
194          - libbz2 uses the Pascal calling convention (WINAPI) for the functions
195              under Win32.
196          - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",
197              therefore missing the function definition.
198          - The compiler thus generates a "C" signature for the test function.
199          - The linker fails to find the "C" function.
200          - PCRE fails to configure if asked to do so against libbz2.
202    11. When running libtoolize from libtool-2.2.6b as part of autogen.sh, these
203        messages were output:
205          Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and
206          rerunning libtoolize, to keep the correct libtool macros in-tree.
207          Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
209        I have done both of these things.
211    12. Although pcre_dfa_exec() does not use nearly as much stack as pcre_exec()
212        most of the time, it *can* run out if it is given a pattern that contains a
213        runaway infinite recursion. I updated the discussion in the pcrestack man
214        page.
216    13. Now that we have gone to the x.xx style of version numbers, the minor
217        version may start with zero. Using 08 or 09 is a bad idea because users
218        might check the value of PCRE_MINOR in their code, and 08 or 09 may be
219        interpreted as invalid octal numbers. I've updated the previous comment in
220        configure.ac, and also added a check that gives an error if 08 or 09 are
221        used.
223    14. Change 8.00/11 was not quite complete: code had been accidentally omitted,
224        causing partial matching to fail when the end of the subject matched \W
225        in a UTF-8 pattern where \W was quantified with a minimum of 3.
227    15. There were some discrepancies between the declarations in pcre_internal.h
228        of _pcre_is_newline(), _pcre_was_newline(), and _pcre_valid_utf8() and
229        their definitions. The declarations used "const uschar *" and the
230        definitions used USPTR. Even though USPTR is normally defined as "const
231        unsigned char *" (and uschar is typedeffed as "unsigned char"), it was
232        reported that: "This difference in casting confuses some C++ compilers, for
233        example, SunCC recognizes above declarations as different functions and
234        generates broken code for hbpcre." I have changed the declarations to use
235        USPTR.
237    16. GNU libtool is named differently on some systems. The autogen.sh script now
238        tries several variants such as glibtoolize (MacOSX) and libtoolize1x
239        (FreeBSD).
241    17. Applied Craig's patch that fixes an HP aCC compile error in pcre 8.00
242        (strtoXX undefined when compiling pcrecpp.cc). The patch contains this
243        comment: "Figure out how to create a longlong from a string: strtoll and
244        equivalent. It's not enough to call AC_CHECK_FUNCS: hpux has a strtoll, for
245        instance, but it only takes 2 args instead of 3!"
247    18. A subtle bug concerned with back references has been fixed by a change of
248        specification, with a corresponding code fix. A pattern such as
249        ^(xa|=?\1a)+$ which contains a back reference inside the group to which it
250        refers, was giving matches when it shouldn't. For example, xa=xaaa would
251        match that pattern. Interestingly, Perl (at least up to 5.11.3) has the
252        same bug. Such groups have to be quantified to be useful, or contained
253        inside another quantified group. (If there's no repetition, the reference
254        can never match.) The problem arises because, having left the group and
255        moved on to the rest of the pattern, a later failure that backtracks into
256        the group uses the captured value from the final iteration of the group
257        rather than the correct earlier one. I have fixed this in PCRE by forcing
258        any group that contains a reference to itself to be an atomic group; that
259        is, there cannot be any backtracking into it once it has completed. This is
260        similar to recursive and subroutine calls.
263    Version 8.00 19-Oct-09
264    ----------------------
266    1.  The table for translating pcre_compile() error codes into POSIX error codes
267        was out-of-date, and there was no check on the pcre_compile() error code
268        being within the table. This could lead to an OK return being given in
269        error.
271    2.  Changed the call to open a subject file in pcregrep from fopen(pathname,
272        "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
273        in a Windows environment.
275    3.  The pcregrep --count option prints the count for each file even when it is
276        zero, as does GNU grep. However, pcregrep was also printing all files when
277        --files-with-matches was added. Now, when both options are given, it prints
278        counts only for those files that have at least one match. (GNU grep just
279        prints the file name in this circumstance, but including the count seems
280        more useful - otherwise, why use --count?) Also ensured that the
281        combination -clh just lists non-zero counts, with no names.
283    4.  The long form of the pcregrep -F option was incorrectly implemented as
284        --fixed_strings instead of --fixed-strings. This is an incompatible change,
285        but it seems right to fix it, and I didn't think it was worth preserving
286        the old behaviour.
288    5.  The command line items --regex=pattern and --regexp=pattern were not
289        recognized by pcregrep, which required --regex pattern or --regexp pattern
290        (with a space rather than an '='). The man page documented the '=' forms,
291        which are compatible with GNU grep; these now work.
293    6.  No libpcreposix.pc file was created for pkg-config; there was just
294        libpcre.pc and libpcrecpp.pc. The omission has been rectified.
296    7.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
297        when UCP support is not needed, by modifying the Python script that
298        generates it from Unicode data files. This should not matter if the module
299        is correctly used as a library, but I received one complaint about 50K of
300        unwanted data. My guess is that the person linked everything into his
301        program rather than using a library. Anyway, it does no harm.
303    8.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
304        was a minimum greater than 1 for a wide character in a possessive
305        repetition. The same bug could also affect patterns like /(\x{ff}{0,2})*/8
306        which had an unlimited repeat of a nested, fixed maximum repeat of a wide
307        character. Chaos in the form of incorrect output or a compiling loop could
308        result.
310    9.  The restrictions on what a pattern can contain when partial matching is
311        requested for pcre_exec() have been removed. All patterns can now be
312        partially matched by this function. In addition, if there are at least two
313        slots in the offset vector, the offset of the earliest inspected character
314        for the match and the offset of the end of the subject are set in them when
315        PCRE_ERROR_PARTIAL is returned.
317    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
318        synonymous with PCRE_PARTIAL, for backwards compatibility, and
319        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
320        and may be more useful for multi-segment matching.
322    11. Partial matching with pcre_exec() is now more intuitive. A partial match
323        used to be given if ever the end of the subject was reached; now it is
324        given only if matching could not proceed because another character was
325        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
326        string "Z", which now yields "no match" instead of "partial match". In the
327        case of pcre_dfa_exec(), "no match" is given if every matching path for the
328        final character ended with (*FAIL).
330    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
331        if the pattern had a "must contain" character that was already found in the
332        earlier partial match, unless partial matching was again requested. For
333        example, with the pattern /dog.(body)?/, the "must contain" character is
334        "g". If the first part-match was for the string "dog", restarting with
335        "sbody" failed. This bug has been fixed.
337    13. The string returned by pcre_dfa_exec() after a partial match has been
338        changed so that it starts at the first inspected character rather than the
339        first character of the match. This makes a difference only if the pattern
340        starts with a lookbehind assertion or \b or \B (\K is not supported by
341        pcre_dfa_exec()). It's an incompatible change, but it makes the two
342        matching functions compatible, and I think it's the right thing to do.
344    14. Added a pcredemo man page, created automatically from the pcredemo.c file,
345        so that the demonstration program is easily available in environments where
346        PCRE has not been installed from source.
348    15. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
349        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
350        library.
352    16. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
353        It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
354        is not the first non-POSIX option to be added. Clearly some people find
355        these options useful.
357    17. If a caller to the POSIX matching function regexec() passes a non-zero
358        value for nmatch with a NULL value for pmatch, the value of
359        nmatch is forced to zero.
361    18. RunGrepTest did not have a test for the availability of the -u option of
362        the diff command, as RunTest does. It now checks in the same way as
363        RunTest, and also checks for the -b option.
365    19. If an odd number of negated classes containing just a single character
366        interposed, within parentheses, between a forward reference to a named
367        subpattern and the definition of the subpattern, compilation crashed with
368        an internal error, complaining that it could not find the referenced
369        subpattern. An example of a crashing pattern is /(?&A)(([^m])(?<A>))/.
370        [The bug was that it was starting one character too far in when skipping
371        over the character class, thus treating the ] as data rather than
372        terminating the class. This meant it could skip too much.]
374    20. Added PCRE_NOTEMPTY_ATSTART in order to be able to correctly implement the
375        /g option in pcretest when the pattern contains \K, which makes it possible
376        to have an empty string match not at the start, even when the pattern is
377        anchored. Updated pcretest and pcredemo to use this option.
379    21. If the maximum number of capturing subpatterns in a recursion was greater
380        than the maximum at the outer level, the higher number was returned, but
381        with unset values at the outer level. The correct (outer level) value is
382        now given.
384    22. If (*ACCEPT) appeared inside capturing parentheses, previous releases of
385        PCRE did not set those parentheses (unlike Perl). I have now found a way to
386        make it do so. The string so far is captured, making this feature
387        compatible with Perl.
389    23. The tests have been re-organized, adding tests 11 and 12, to make it
390        possible to check the Perl 5.10 features against Perl 5.10.
392    24. Perl 5.10 allows subroutine calls in lookbehinds, as long as the subroutine
393        pattern matches a fixed length string. PCRE did not allow this; now it
394        does. Neither allows recursion.
396    25. I finally figured out how to implement a request to provide the minimum
397        length of subject string that was needed in order to match a given pattern.
398        (It was back references and recursion that I had previously got hung up
399        on.) This code has now been added to pcre_study(); it finds a lower bound
400        to the length of subject needed. It is not necessarily the greatest lower
401        bound, but using it to avoid searching strings that are too short does give
402        some useful speed-ups. The value is available to calling programs via
403        pcre_fullinfo().
405    26. While implementing 25, I discovered to my embarrassment that pcretest had
406        not been passing the result of pcre_study() to pcre_dfa_exec(), so the
407        study optimizations had never been tested with that matching function.
408        Oops. What is worse, even when it was passed study data, there was a bug in
409        pcre_dfa_exec() that meant it never actually used it. Double oops. There
410        were also very few tests of studied patterns with pcre_dfa_exec().
412    27. If (?| is used to create subpatterns with duplicate numbers, they are now
413        allowed to have the same name, even if PCRE_DUPNAMES is not set. However,
414        on the other side of the coin, they are no longer allowed to have different
415        names, because these cannot be distinguished in PCRE, and this has caused
416        confusion. (This is a difference from Perl.)
418    28. When duplicate subpattern names are present (necessarily with different
419        numbers, as required by 27 above), and a test is made by name in a
420        conditional pattern, either for a subpattern having been matched, or for
421        recursion in such a pattern, all the associated numbered subpatterns are
422        tested, and the overall condition is true if the condition is true for any
423        one of them. This is the way Perl works, and is also more like the way
424        testing by number works.
427    Version 7.9 11-Apr-09
428    ---------------------
430    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
431        (pcretest), all targets were linked against these libraries. This included
432        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
433        libraries. This caused unwanted dependencies to be created. This problem
434        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
435        pcretest is linked with readline.
437    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
438        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
439        moved outside it again, because FALSE and TRUE are already defined in AIX,
440        but BOOL is not.
442    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
443        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
445    4.  The pcregrep documentation said spaces were inserted as well as colons (or
446        hyphens) following file names and line numbers when outputting matching
447        lines. This is not true; no spaces are inserted. I have also clarified the
448        wording for the --colour (or --color) option.
450    5.  In pcregrep, when --colour was used with -o, the list of matching strings
451        was not coloured; this is different to GNU grep, so I have changed it to be
452        the same.
454    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
455        each matching line was coloured. Now it goes on to look for further matches
456        of any of the test patterns, which is the same behaviour as GNU grep.
458    7.  A pattern that could match an empty string could cause pcregrep to loop; it
459        doesn't make sense to accept an empty string match in pcregrep, so I have
460        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
461        seems to be how GNU grep behaves.
463    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
464        start or after a newline", because the conditional assertion was not being
465        correctly handled. The rule now is that both the assertion and what follows
466        in the first alternative must satisfy the test.
468    9.  If auto-callout was enabled in a pattern with a conditional group whose
469        condition was an assertion, PCRE could crash during matching, both with
470        pcre_exec() and pcre_dfa_exec().
472    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
473        used for matching.
475    11. Unicode property support in character classes was not working for
476        characters (bytes) greater than 127 when not in UTF-8 mode.
478    12. Added the -M command line option to pcretest.
480    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
482    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
484    16. Added comments and documentation about mis-use of no_arg in the C++
485        wrapper.
487    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
488        from Martin Jerabek that uses macro names for all relevant character and
489        string constants.
491    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
492        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
493        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
494        these, but not everybody uses configure.
496    19. A conditional group that had only one branch was not being correctly
497        recognized as an item that could match an empty string. This meant that an
498        enclosing group might also not be so recognized, causing infinite looping
499        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
500        with the subject "ab", where knowledge that the repeated group can match
501        nothing is needed in order to break the loop.
503    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
504        exec(), but without supplying a callout function, matching went wrong.
506    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
507        leak if the size of the offset vector was greater than 30. When the vector
508        is smaller, the saved offsets during recursion go onto a local stack
509        vector, but for larger vectors malloc() is used. It was failing to free
510        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
511        error, in fact).
513    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
514        heapframe that is used only when UTF-8 support is enabled. This caused no
515        problem, but was untidy.
517    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
518        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
519        included within another project.
521    24. Steven Van Ingelgem's patches to add more options to the CMake support,
522        slightly modified by me:
524          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
525              not building pcregrep.
527          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
528              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
530    25. Forward references, both numeric and by name, in patterns that made use of
531        duplicate group numbers, could behave incorrectly or give incorrect errors,
532        because when scanning forward to find the reference group, PCRE was not
533        taking into account the duplicate group numbers. A pattern such as
534        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
536    26. Changed a few more instances of "const unsigned char *" to USPTR, making
537        the feature of a custom pointer more persuasive (as requested by a user).
539    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
540        pcretest.c, inside #ifndefs, because it seems they are sometimes already
541        pre-defined.
543    28. Added support for (*UTF8) at the start of a pattern.
545    29. Arrange for flags added by the "release type" setting in CMake to be shown
546        in the configuration summary.
549    Version 7.8 05-Sep-08
550    ---------------------
552    1.  Replaced UCP searching code with optimized version as implemented for Ad
553        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
554        stage table and inline lookup instead of a function, giving speed ups of 2
555        to 5 times on some simple patterns that I tested. Permission was given to
556        distribute the MultiStage2.py script that generates the tables (it's not in
557        the tarball, but is in the Subversion repository).
559    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
560        scripts.
562    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
563        a group with a zero qualifier. The result of the study could be incorrect,
564        or the function might crash, depending on the pattern.
566    4.  Caseless matching was not working for non-ASCII characters in back
567        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
568        It now works when Unicode Property Support is available.
570    5.  In pcretest, an escape such as \x{de} in the data was always generating
571        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
572        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
573        truncation.
575    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
577    7.  Added two (int) casts to pcregrep when printing the difference of two
578        pointers, in case they are 64-bit values.
580    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
581        test 2 if it fails.
583    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
584        and a #define of that name to empty if it is not externally set. This is to
585        allow users of MSVC to set it if necessary.
587    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
588        the convenience functions in the pcre_get.c source file.
590    11. An option change at the start of a pattern that had top-level alternatives
591        could cause overwriting and/or a crash. This command provoked a crash in
592        some environments:
594          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
596        This potential security problem was recorded as CVE-2008-2371.
598    12. For a pattern where the match had to start at the beginning or immediately
599        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
600        pcre_dfa_exec() could read past the end of the passed subject if there was
601        no match. To help with detecting such bugs (e.g. with valgrind), I modified
602        pcretest so that it places the subject at the end of its malloc-ed buffer.
604    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
605        exec() might read past the end of the data buffer in UTF-8 mode.
607    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
608        the data contained the byte 0x85 as part of a UTF-8 character within its
609        first line. This applied both to normal and DFA matching.
611    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
612        /^[^d]*?$/8 failed to match "abc".
614    16. Added a missing copyright notice to pcrecpp_internal.h.
616    17. Make it more clear in the documentation that values returned from
617        pcre_exec() in ovector are byte offsets, not character counts.
619    18. Tidied a few places to stop certain compilers from issuing warnings.
621    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
622        supplied by Stefan Weber. I made a further small update for 7.8 because
623        there is a change of source arrangements: the pcre_searchfuncs.c module is
624        replaced by pcre_ucd.c.
627    Version 7.7 07-May-08
628    ---------------------
630    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
631        a string to a long long, pretend we don't even have a long long." This is
632        done by checking for the strtoq, strtoll, and _strtoi64 functions.
634    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
635        pre-7.6 versions, which defined a global no_arg variable instead of putting
636        it in the RE class. (See also #8 below.)
638    3.  Remove a line of dead code, identified by coverity and reported by Nuno
639        Lopes.
641    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
643        (1) The include/exclude patterns were being applied to the whole pathnames
644            of files, instead of just to the final components.
646        (2) If there was more than one level of directory, the subdirectories were
647            skipped unless they satisfied the include/exclude conditions. This is
648            inconsistent with GNU grep (and could even be seen as contrary to the
649            pcregrep specification - which I improved to make it absolutely clear).
650            The action now is always to scan all levels of directory, and just
651            apply the include/exclude patterns to regular files.
653    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
654        --exclude_dir in the tests to avoid scanning .svn directories.
656    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
657        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
658        doesn't support NULs in patterns.
660    7.  Added some missing "const"s to declarations of static tables in
661        pcre_compile.c and pcre_dfa_exec.c.
663    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
664        caused by fix #2  above. (Subsequently also a second patch to fix the
665        first patch. And a third patch - this was a messy problem.)
667    9.  Applied Craig's patch to remove the use of push_back().
669    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
670        matching function regexec().
672    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
673        which, however, unlike Perl's \g{...}, are subroutine calls, not back
674        references. PCRE supports relative numbers with this syntax (I don't think
675        Oniguruma does).
677    12. Previously, a group with a zero repeat such as (...){0} was completely
678        omitted from the compiled regex. However, this means that if the group
679        was called as a subroutine from elsewhere in the pattern, things went wrong
680        (an internal error was given). Such groups are now left in the compiled
681        pattern, with a new opcode that causes them to be skipped at execution
682        time.
684    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
685        to the way PCRE behaves:
687        (a) A lone ] character is dis-allowed (Perl treats it as data).
689        (b) A back reference to an unmatched subpattern matches an empty string
690            (Perl fails the current match path).
692        (c) A data ] in a character class must be notated as \] because if the
693            first data character in a class is ], it defines an empty class. (In
694            Perl it is not possible to have an empty class.) The empty class []
695            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
696            The negative empty class [^] matches any one character, independently
697            of the DOTALL setting.
699    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
700        non-existent subpattern following a character class starting with ']' and
701        containing () gave an internal compiling error instead of "reference to
702        non-existent subpattern". Fortunately, when the pattern did exist, the
703        compiled code was correct. (When scanning forwards to check for the
704        existencd of the subpattern, it was treating the data ']' as terminating
705        the class, so got the count wrong. When actually compiling, the reference
706        was subsequently set up correctly.)
708    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
709        it was being rejected as not supported by pcre_dfa_exec(), even though
710        other assertions are supported. I have made pcre_dfa_exec() support
711        (*FAIL).
713    16. The implementation of 13c above involved the invention of a new opcode,
714        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
715        cannot be changed at match time, I realized I could make a small
716        improvement to matching performance by compiling OP_ALLANY instead of
717        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
718        on the OP_ANY path.
720    17. Compiling pcretest on Windows with readline support failed without the
721        following two fixes: (1) Make the unistd.h include conditional on
722        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
724    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
725        ncurses library to be included for pcretest when ReadLine support is
726        requested, but also to allow for it to be overridden. This patch came from
727        Daniel Bergström.
729    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
730        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
731        any errors with the current Unicode tables. Thanks to Peter Kankowski for
732        spotting this.
735    Version 7.6 28-Jan-08
736  ---------------------  ---------------------
738  1.  A character class containing a very large number of characters with  1.  A character class containing a very large number of characters with
739      codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer      codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
740      overflow.      overflow.
742  2.  Patch to cut out the "long long" test in pcrecpp_unittest when  2.  Patch to cut out the "long long" test in pcrecpp_unittest when
743      HAVE_LONG_LONG is not defined.      HAVE_LONG_LONG is not defined.
745  3.  Applied Christian Ehrlicher's patch to update the CMake build files to  3.  Applied Christian Ehrlicher's patch to update the CMake build files to
746      bring them up to date and include new features. This patch includes:      bring them up to date and include new features. This patch includes:
748      - Fixed PH's badly added libz and libbz2 support.      - Fixed PH's badly added libz and libbz2 support.
749      - Fixed a problem with static linking.      - Fixed a problem with static linking.
750      - Added pcredemo.      - Added pcredemo. [But later removed - see 7 below.]
751      - Fixed dftables problem and added an option.      - Fixed dftables problem and added an option.
752      - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and      - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
753          HAVE_LONG_LONG.          HAVE_LONG_LONG.
754      - Added readline support for pcretest.      - Added readline support for pcretest.
755      - Added an listing of the option settings after cmake has run.      - Added an listing of the option settings after cmake has run.
757    4.  A user submitted a patch to Makefile that makes it easy to create
758        "pcre.dll" under mingw when using Configure/Make. I added stuff to
759        Makefile.am that cause it to include this special target, without
760        affecting anything else. Note that the same mingw target plus all
761        the other distribution libraries and programs are now supported
762        when configuring with CMake (see 6 below) instead of with
763        Configure/Make.
765    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
766        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
767        exported in the Windows port". It has not yet been confirmed that the patch
768        solves the problem, but it does no harm.
770    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
771        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
772        with CMake, and also correct the comment about stack recursion.
774    7.  Remove the automatic building of pcredemo from the ./configure system and
775        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
776        of a program that users should build themselves after PCRE is installed, so
777        building it automatically is not really right. What is more, it gave
778        trouble in some build environments.
780    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
783  Version 7.5 10-Jan-08  Version 7.5 10-Jan-08
784  ---------------------  ---------------------

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