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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.)
24    Version 8.02 19-Mar-2010
25    ------------------------
27    1.  The Unicode data tables have been updated to Unicode 5.2.0.
29    2.  Added the option --libs-cpp to pcre-config, but only when C++ support is
30        configured.
32    3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the
33        original author of that file, following a query about its status.
35    4.  On systems that do not have stdint.h (e.g. Solaris), check for and include
36        inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.
38    5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
39        quantifier applied to a forward-referencing subroutine call, could compile
40        incorrect code or give the error "internal error: previously-checked
41        referenced subpattern not found".
43    6.  Both MS Visual Studio and Symbian OS have problems with initializing
44        variables to point to external functions. For these systems, therefore,
45        pcre_malloc etc. are now initialized to local functions that call the
46        relevant global functions.
48    7.  There were two entries missing in the vectors called coptable and poptable
49        in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.
50        I've fixed the data, and added a kludgy way of testing at compile time that
51        the lengths are correct (equal to the number of opcodes).
53    8.  Following on from 7, I added a similar kludge to check the length of the
54        eint vector in pcreposix.c.
56    9.  Error texts for pcre_compile() are held as one long string to avoid too
57        much relocation at load time. To find a text, the string is searched,
58        counting zeros. There was no check for running off the end of the string,
59        which could happen if a new error number was added without updating the
60        string.
62    10. \K gave a compile-time error if it appeared in a lookbehind assersion.
64    11. \K was not working if it appeared in an atomic group or in a group that
65        was called as a "subroutine", or in an assertion. Perl 5.11 documents that
66        \K is "not well defined" if used in an assertion. PCRE now accepts it if
67        the assertion is positive, but not if it is negative.
69    12. Change 11 fortuitously reduced the size of the stack frame used in the
70        "match()" function of pcre_exec.c by one pointer. Forthcoming
71        implementation of support for (*MARK) will need an extra pointer on the
72        stack; I have reserved it now, so that the stack frame size does not
73        decrease.
75    13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other
76        item in branch that calls a recursion is a subroutine call - as in the
77        second branch in the above example - was incorrectly given the compile-
78        time error "recursive call could loop indefinitely" because pcre_compile()
79        was not correctly checking the subroutine for matching a non-empty string.
81    14. The checks for overrunning compiling workspace could trigger after an
82        overrun had occurred. This is a "should never occur" error, but it can be
83        triggered by pathological patterns such as hundreds of nested parentheses.
84        The checks now trigger 100 bytes before the end of the workspace.
86    15. Fix typo in configure.ac: "srtoq" should be "strtoq".
89    Version 8.01 19-Jan-2010
90    ------------------------
92    1.  If a pattern contained a conditional subpattern with only one branch (in
93        particular, this includes all (*DEFINE) patterns), a call to pcre_study()
94        computed the wrong minimum data length (which is of course zero for such
95        subpatterns). This could cause incorrect "no match" results.
97    2.  For patterns such as (?i)a(?-i)b|c where an option setting at the start of
98        the pattern is reset in the first branch, pcre_compile() failed with
99        "internal error: code overflow at offset...". This happened only when
100        the reset was to the original external option setting. (An optimization
101        abstracts leading options settings into an external setting, which was the
102        cause of this.)
104    3.  A pattern such as ^(?!a(*SKIP)b) where a negative assertion contained one
105        of the verbs SKIP, PRUNE, or COMMIT, did not work correctly. When the
106        assertion pattern did not match (meaning that the assertion was true), it
107        was incorrectly treated as false if the SKIP had been reached during the
108        matching. This also applied to assertions used as conditions.
110    4.  If an item that is not supported by pcre_dfa_exec() was encountered in an
111        assertion subpattern, including such a pattern used as a condition,
112        unpredictable results occurred, instead of the error return
115    5.  The C++ GlobalReplace function was not working like Perl for the special
116        situation when an empty string is matched. It now does the fancy magic
117        stuff that is necessary.
119    6.  In pcre_internal.h, obsolete includes to setjmp.h and stdarg.h have been
120        removed. (These were left over from very, very early versions of PCRE.)
122    7.  Some cosmetic changes to the code to make life easier when compiling it
123        as part of something else:
125        (a) Change DEBUG to PCRE_DEBUG.
127        (b) In pcre_compile(), rename the member of the "branch_chain" structure
128            called "current" as "current_branch", to prevent a collision with the
129            Linux macro when compiled as a kernel module.
131        (c) In pcre_study(), rename the function set_bit() as set_table_bit(), to
132            prevent a collision with the Linux macro when compiled as a kernel
133            module.
135    8.  In pcre_compile() there are some checks for integer overflows that used to
136        cast potentially large values to (double). This has been changed to that
137        when building, a check for int64_t is made, and if it is found, it is used
138        instead, thus avoiding the use of floating point arithmetic. (There is no
139        other use of FP in PCRE.) If int64_t is not found, the fallback is to
140        double.
142    9.  Added two casts to avoid signed/unsigned warnings from VS Studio Express
143        2005 (difference between two addresses compared to an unsigned value).
145    10. Change the standard AC_CHECK_LIB test for libbz2 in configure.ac to a
146        custom one, because of the following reported problem in Windows:
148          - libbz2 uses the Pascal calling convention (WINAPI) for the functions
149              under Win32.
150          - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",
151              therefore missing the function definition.
152          - The compiler thus generates a "C" signature for the test function.
153          - The linker fails to find the "C" function.
154          - PCRE fails to configure if asked to do so against libbz2.
156    11. When running libtoolize from libtool-2.2.6b as part of autogen.sh, these
157        messages were output:
159          Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and
160          rerunning libtoolize, to keep the correct libtool macros in-tree.
161          Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
163        I have done both of these things.
165    12. Although pcre_dfa_exec() does not use nearly as much stack as pcre_exec()
166        most of the time, it *can* run out if it is given a pattern that contains a
167        runaway infinite recursion. I updated the discussion in the pcrestack man
168        page.
170    13. Now that we have gone to the x.xx style of version numbers, the minor
171        version may start with zero. Using 08 or 09 is a bad idea because users
172        might check the value of PCRE_MINOR in their code, and 08 or 09 may be
173        interpreted as invalid octal numbers. I've updated the previous comment in
174        configure.ac, and also added a check that gives an error if 08 or 09 are
175        used.
177    14. Change 8.00/11 was not quite complete: code had been accidentally omitted,
178        causing partial matching to fail when the end of the subject matched \W
179        in a UTF-8 pattern where \W was quantified with a minimum of 3.
181    15. There were some discrepancies between the declarations in pcre_internal.h
182        of _pcre_is_newline(), _pcre_was_newline(), and _pcre_valid_utf8() and
183        their definitions. The declarations used "const uschar *" and the
184        definitions used USPTR. Even though USPTR is normally defined as "const
185        unsigned char *" (and uschar is typedeffed as "unsigned char"), it was
186        reported that: "This difference in casting confuses some C++ compilers, for
187        example, SunCC recognizes above declarations as different functions and
188        generates broken code for hbpcre." I have changed the declarations to use
189        USPTR.
191    16. GNU libtool is named differently on some systems. The autogen.sh script now
192        tries several variants such as glibtoolize (MacOSX) and libtoolize1x
193        (FreeBSD).
195    17. Applied Craig's patch that fixes an HP aCC compile error in pcre 8.00
196        (strtoXX undefined when compiling pcrecpp.cc). The patch contains this
197        comment: "Figure out how to create a longlong from a string: strtoll and
198        equivalent. It's not enough to call AC_CHECK_FUNCS: hpux has a strtoll, for
199        instance, but it only takes 2 args instead of 3!"
201    18. A subtle bug concerned with back references has been fixed by a change of
202        specification, with a corresponding code fix. A pattern such as
203        ^(xa|=?\1a)+$ which contains a back reference inside the group to which it
204        refers, was giving matches when it shouldn't. For example, xa=xaaa would
205        match that pattern. Interestingly, Perl (at least up to 5.11.3) has the
206        same bug. Such groups have to be quantified to be useful, or contained
207        inside another quantified group. (If there's no repetition, the reference
208        can never match.) The problem arises because, having left the group and
209        moved on to the rest of the pattern, a later failure that backtracks into
210        the group uses the captured value from the final iteration of the group
211        rather than the correct earlier one. I have fixed this in PCRE by forcing
212        any group that contains a reference to itself to be an atomic group; that
213        is, there cannot be any backtracking into it once it has completed. This is
214        similar to recursive and subroutine calls.
217    Version 8.00 19-Oct-09
218    ----------------------
220    1.  The table for translating pcre_compile() error codes into POSIX error codes
221        was out-of-date, and there was no check on the pcre_compile() error code
222        being within the table. This could lead to an OK return being given in
223        error.
225    2.  Changed the call to open a subject file in pcregrep from fopen(pathname,
226        "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
227        in a Windows environment.
229    3.  The pcregrep --count option prints the count for each file even when it is
230        zero, as does GNU grep. However, pcregrep was also printing all files when
231        --files-with-matches was added. Now, when both options are given, it prints
232        counts only for those files that have at least one match. (GNU grep just
233        prints the file name in this circumstance, but including the count seems
234        more useful - otherwise, why use --count?) Also ensured that the
235        combination -clh just lists non-zero counts, with no names.
237    4.  The long form of the pcregrep -F option was incorrectly implemented as
238        --fixed_strings instead of --fixed-strings. This is an incompatible change,
239        but it seems right to fix it, and I didn't think it was worth preserving
240        the old behaviour.
242    5.  The command line items --regex=pattern and --regexp=pattern were not
243        recognized by pcregrep, which required --regex pattern or --regexp pattern
244        (with a space rather than an '='). The man page documented the '=' forms,
245        which are compatible with GNU grep; these now work.
247    6.  No libpcreposix.pc file was created for pkg-config; there was just
248        libpcre.pc and libpcrecpp.pc. The omission has been rectified.
250    7.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
251        when UCP support is not needed, by modifying the Python script that
252        generates it from Unicode data files. This should not matter if the module
253        is correctly used as a library, but I received one complaint about 50K of
254        unwanted data. My guess is that the person linked everything into his
255        program rather than using a library. Anyway, it does no harm.
257    8.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
258        was a minimum greater than 1 for a wide character in a possessive
259        repetition. The same bug could also affect patterns like /(\x{ff}{0,2})*/8
260        which had an unlimited repeat of a nested, fixed maximum repeat of a wide
261        character. Chaos in the form of incorrect output or a compiling loop could
262        result.
264    9.  The restrictions on what a pattern can contain when partial matching is
265        requested for pcre_exec() have been removed. All patterns can now be
266        partially matched by this function. In addition, if there are at least two
267        slots in the offset vector, the offset of the earliest inspected character
268        for the match and the offset of the end of the subject are set in them when
269        PCRE_ERROR_PARTIAL is returned.
271    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
272        synonymous with PCRE_PARTIAL, for backwards compatibility, and
273        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
274        and may be more useful for multi-segment matching.
276    11. Partial matching with pcre_exec() is now more intuitive. A partial match
277        used to be given if ever the end of the subject was reached; now it is
278        given only if matching could not proceed because another character was
279        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
280        string "Z", which now yields "no match" instead of "partial match". In the
281        case of pcre_dfa_exec(), "no match" is given if every matching path for the
282        final character ended with (*FAIL).
284    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
285        if the pattern had a "must contain" character that was already found in the
286        earlier partial match, unless partial matching was again requested. For
287        example, with the pattern /dog.(body)?/, the "must contain" character is
288        "g". If the first part-match was for the string "dog", restarting with
289        "sbody" failed. This bug has been fixed.
291    13. The string returned by pcre_dfa_exec() after a partial match has been
292        changed so that it starts at the first inspected character rather than the
293        first character of the match. This makes a difference only if the pattern
294        starts with a lookbehind assertion or \b or \B (\K is not supported by
295        pcre_dfa_exec()). It's an incompatible change, but it makes the two
296        matching functions compatible, and I think it's the right thing to do.
298    14. Added a pcredemo man page, created automatically from the pcredemo.c file,
299        so that the demonstration program is easily available in environments where
300        PCRE has not been installed from source.
302    15. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
303        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
304        library.
306    16. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
307        It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
308        is not the first non-POSIX option to be added. Clearly some people find
309        these options useful.
311    17. If a caller to the POSIX matching function regexec() passes a non-zero
312        value for nmatch with a NULL value for pmatch, the value of
313        nmatch is forced to zero.
315    18. RunGrepTest did not have a test for the availability of the -u option of
316        the diff command, as RunTest does. It now checks in the same way as
317        RunTest, and also checks for the -b option.
319    19. If an odd number of negated classes containing just a single character
320        interposed, within parentheses, between a forward reference to a named
321        subpattern and the definition of the subpattern, compilation crashed with
322        an internal error, complaining that it could not find the referenced
323        subpattern. An example of a crashing pattern is /(?&A)(([^m])(?<A>))/.
324        [The bug was that it was starting one character too far in when skipping
325        over the character class, thus treating the ] as data rather than
326        terminating the class. This meant it could skip too much.]
328    20. Added PCRE_NOTEMPTY_ATSTART in order to be able to correctly implement the
329        /g option in pcretest when the pattern contains \K, which makes it possible
330        to have an empty string match not at the start, even when the pattern is
331        anchored. Updated pcretest and pcredemo to use this option.
333    21. If the maximum number of capturing subpatterns in a recursion was greater
334        than the maximum at the outer level, the higher number was returned, but
335        with unset values at the outer level. The correct (outer level) value is
336        now given.
338    22. If (*ACCEPT) appeared inside capturing parentheses, previous releases of
339        PCRE did not set those parentheses (unlike Perl). I have now found a way to
340        make it do so. The string so far is captured, making this feature
341        compatible with Perl.
343    23. The tests have been re-organized, adding tests 11 and 12, to make it
344        possible to check the Perl 5.10 features against Perl 5.10.
346    24. Perl 5.10 allows subroutine calls in lookbehinds, as long as the subroutine
347        pattern matches a fixed length string. PCRE did not allow this; now it
348        does. Neither allows recursion.
350    25. I finally figured out how to implement a request to provide the minimum
351        length of subject string that was needed in order to match a given pattern.
352        (It was back references and recursion that I had previously got hung up
353        on.) This code has now been added to pcre_study(); it finds a lower bound
354        to the length of subject needed. It is not necessarily the greatest lower
355        bound, but using it to avoid searching strings that are too short does give
356        some useful speed-ups. The value is available to calling programs via
357        pcre_fullinfo().
359    26. While implementing 25, I discovered to my embarrassment that pcretest had
360        not been passing the result of pcre_study() to pcre_dfa_exec(), so the
361        study optimizations had never been tested with that matching function.
362        Oops. What is worse, even when it was passed study data, there was a bug in
363        pcre_dfa_exec() that meant it never actually used it. Double oops. There
364        were also very few tests of studied patterns with pcre_dfa_exec().
366    27. If (?| is used to create subpatterns with duplicate numbers, they are now
367        allowed to have the same name, even if PCRE_DUPNAMES is not set. However,
368        on the other side of the coin, they are no longer allowed to have different
369        names, because these cannot be distinguished in PCRE, and this has caused
370        confusion. (This is a difference from Perl.)
372    28. When duplicate subpattern names are present (necessarily with different
373        numbers, as required by 27 above), and a test is made by name in a
374        conditional pattern, either for a subpattern having been matched, or for
375        recursion in such a pattern, all the associated numbered subpatterns are
376        tested, and the overall condition is true if the condition is true for any
377        one of them. This is the way Perl works, and is also more like the way
378        testing by number works.
381    Version 7.9 11-Apr-09
382    ---------------------
384    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
385        (pcretest), all targets were linked against these libraries. This included
386        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
387        libraries. This caused unwanted dependencies to be created. This problem
388        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
389        pcretest is linked with readline.
391    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
392        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
393        moved outside it again, because FALSE and TRUE are already defined in AIX,
394        but BOOL is not.
396    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
397        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
399    4.  The pcregrep documentation said spaces were inserted as well as colons (or
400        hyphens) following file names and line numbers when outputting matching
401        lines. This is not true; no spaces are inserted. I have also clarified the
402        wording for the --colour (or --color) option.
404    5.  In pcregrep, when --colour was used with -o, the list of matching strings
405        was not coloured; this is different to GNU grep, so I have changed it to be
406        the same.
408    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
409        each matching line was coloured. Now it goes on to look for further matches
410        of any of the test patterns, which is the same behaviour as GNU grep.
412    7.  A pattern that could match an empty string could cause pcregrep to loop; it
413        doesn't make sense to accept an empty string match in pcregrep, so I have
414        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
415        seems to be how GNU grep behaves.
417    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
418        start or after a newline", because the conditional assertion was not being
419        correctly handled. The rule now is that both the assertion and what follows
420        in the first alternative must satisfy the test.
422    9.  If auto-callout was enabled in a pattern with a conditional group whose
423        condition was an assertion, PCRE could crash during matching, both with
424        pcre_exec() and pcre_dfa_exec().
426    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
427        used for matching.
429    11. Unicode property support in character classes was not working for
430        characters (bytes) greater than 127 when not in UTF-8 mode.
432    12. Added the -M command line option to pcretest.
434    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
436    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
438    16. Added comments and documentation about mis-use of no_arg in the C++
439        wrapper.
441    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
442        from Martin Jerabek that uses macro names for all relevant character and
443        string constants.
445    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
446        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
447        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
448        these, but not everybody uses configure.
450    19. A conditional group that had only one branch was not being correctly
451        recognized as an item that could match an empty string. This meant that an
452        enclosing group might also not be so recognized, causing infinite looping
453        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
454        with the subject "ab", where knowledge that the repeated group can match
455        nothing is needed in order to break the loop.
457    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
458        exec(), but without supplying a callout function, matching went wrong.
460    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
461        leak if the size of the offset vector was greater than 30. When the vector
462        is smaller, the saved offsets during recursion go onto a local stack
463        vector, but for larger vectors malloc() is used. It was failing to free
464        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
465        error, in fact).
467    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
468        heapframe that is used only when UTF-8 support is enabled. This caused no
469        problem, but was untidy.
471    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
472        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
473        included within another project.
475    24. Steven Van Ingelgem's patches to add more options to the CMake support,
476        slightly modified by me:
478          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
479              not building pcregrep.
481          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
482              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
484    25. Forward references, both numeric and by name, in patterns that made use of
485        duplicate group numbers, could behave incorrectly or give incorrect errors,
486        because when scanning forward to find the reference group, PCRE was not
487        taking into account the duplicate group numbers. A pattern such as
488        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
490    26. Changed a few more instances of "const unsigned char *" to USPTR, making
491        the feature of a custom pointer more persuasive (as requested by a user).
493    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
494        pcretest.c, inside #ifndefs, because it seems they are sometimes already
495        pre-defined.
497    28. Added support for (*UTF8) at the start of a pattern.
499    29. Arrange for flags added by the "release type" setting in CMake to be shown
500        in the configuration summary.
503    Version 7.8 05-Sep-08
504    ---------------------
506    1.  Replaced UCP searching code with optimized version as implemented for Ad
507        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
508        stage table and inline lookup instead of a function, giving speed ups of 2
509        to 5 times on some simple patterns that I tested. Permission was given to
510        distribute the MultiStage2.py script that generates the tables (it's not in
511        the tarball, but is in the Subversion repository).
513    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
514        scripts.
516    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
517        a group with a zero qualifier. The result of the study could be incorrect,
518        or the function might crash, depending on the pattern.
520    4.  Caseless matching was not working for non-ASCII characters in back
521        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
522        It now works when Unicode Property Support is available.
524    5.  In pcretest, an escape such as \x{de} in the data was always generating
525        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
526        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
527        truncation.
529    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
531    7.  Added two (int) casts to pcregrep when printing the difference of two
532        pointers, in case they are 64-bit values.
534    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
535        test 2 if it fails.
537    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
538        and a #define of that name to empty if it is not externally set. This is to
539        allow users of MSVC to set it if necessary.
541    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
542        the convenience functions in the pcre_get.c source file.
544    11. An option change at the start of a pattern that had top-level alternatives
545        could cause overwriting and/or a crash. This command provoked a crash in
546        some environments:
548          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
550        This potential security problem was recorded as CVE-2008-2371.
552    12. For a pattern where the match had to start at the beginning or immediately
553        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
554        pcre_dfa_exec() could read past the end of the passed subject if there was
555        no match. To help with detecting such bugs (e.g. with valgrind), I modified
556        pcretest so that it places the subject at the end of its malloc-ed buffer.
558    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
559        exec() might read past the end of the data buffer in UTF-8 mode.
561    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
562        the data contained the byte 0x85 as part of a UTF-8 character within its
563        first line. This applied both to normal and DFA matching.
565    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
566        /^[^d]*?$/8 failed to match "abc".
568    16. Added a missing copyright notice to pcrecpp_internal.h.
570    17. Make it more clear in the documentation that values returned from
571        pcre_exec() in ovector are byte offsets, not character counts.
573    18. Tidied a few places to stop certain compilers from issuing warnings.
575    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
576        supplied by Stefan Weber. I made a further small update for 7.8 because
577        there is a change of source arrangements: the pcre_searchfuncs.c module is
578        replaced by pcre_ucd.c.
581    Version 7.7 07-May-08
582    ---------------------
584    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
585        a string to a long long, pretend we don't even have a long long." This is
586        done by checking for the strtoq, strtoll, and _strtoi64 functions.
588    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
589        pre-7.6 versions, which defined a global no_arg variable instead of putting
590        it in the RE class. (See also #8 below.)
592    3.  Remove a line of dead code, identified by coverity and reported by Nuno
593        Lopes.
595    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
597        (1) The include/exclude patterns were being applied to the whole pathnames
598            of files, instead of just to the final components.
600        (2) If there was more than one level of directory, the subdirectories were
601            skipped unless they satisfied the include/exclude conditions. This is
602            inconsistent with GNU grep (and could even be seen as contrary to the
603            pcregrep specification - which I improved to make it absolutely clear).
604            The action now is always to scan all levels of directory, and just
605            apply the include/exclude patterns to regular files.
607    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
608        --exclude_dir in the tests to avoid scanning .svn directories.
610    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
611        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
612        doesn't support NULs in patterns.
614    7.  Added some missing "const"s to declarations of static tables in
615        pcre_compile.c and pcre_dfa_exec.c.
617    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
618        caused by fix #2  above. (Subsequently also a second patch to fix the
619        first patch. And a third patch - this was a messy problem.)
621    9.  Applied Craig's patch to remove the use of push_back().
623    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
624        matching function regexec().
626    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
627        which, however, unlike Perl's \g{...}, are subroutine calls, not back
628        references. PCRE supports relative numbers with this syntax (I don't think
629        Oniguruma does).
631    12. Previously, a group with a zero repeat such as (...){0} was completely
632        omitted from the compiled regex. However, this means that if the group
633        was called as a subroutine from elsewhere in the pattern, things went wrong
634        (an internal error was given). Such groups are now left in the compiled
635        pattern, with a new opcode that causes them to be skipped at execution
636        time.
638    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
639        to the way PCRE behaves:
641        (a) A lone ] character is dis-allowed (Perl treats it as data).
643        (b) A back reference to an unmatched subpattern matches an empty string
644            (Perl fails the current match path).
646        (c) A data ] in a character class must be notated as \] because if the
647            first data character in a class is ], it defines an empty class. (In
648            Perl it is not possible to have an empty class.) The empty class []
649            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
650            The negative empty class [^] matches any one character, independently
651            of the DOTALL setting.
653    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
654        non-existent subpattern following a character class starting with ']' and
655        containing () gave an internal compiling error instead of "reference to
656        non-existent subpattern". Fortunately, when the pattern did exist, the
657        compiled code was correct. (When scanning forwards to check for the
658        existencd of the subpattern, it was treating the data ']' as terminating
659        the class, so got the count wrong. When actually compiling, the reference
660        was subsequently set up correctly.)
662    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
663        it was being rejected as not supported by pcre_dfa_exec(), even though
664        other assertions are supported. I have made pcre_dfa_exec() support
665        (*FAIL).
667    16. The implementation of 13c above involved the invention of a new opcode,
668        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
669        cannot be changed at match time, I realized I could make a small
670        improvement to matching performance by compiling OP_ALLANY instead of
671        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
672        on the OP_ANY path.
674    17. Compiling pcretest on Windows with readline support failed without the
675        following two fixes: (1) Make the unistd.h include conditional on
676        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
678    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
679        ncurses library to be included for pcretest when ReadLine support is
680        requested, but also to allow for it to be overridden. This patch came from
681        Daniel Bergström.
683    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
684        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
685        any errors with the current Unicode tables. Thanks to Peter Kankowski for
686        spotting this.
689    Version 7.6 28-Jan-08
690    ---------------------
692    1.  A character class containing a very large number of characters with
693        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
694        overflow.
696    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
697        HAVE_LONG_LONG is not defined.
699    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
700        bring them up to date and include new features. This patch includes:
702        - Fixed PH's badly added libz and libbz2 support.
703        - Fixed a problem with static linking.
704        - Added pcredemo. [But later removed - see 7 below.]
705        - Fixed dftables problem and added an option.
706        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
707            HAVE_LONG_LONG.
708        - Added readline support for pcretest.
709        - Added an listing of the option settings after cmake has run.
711    4.  A user submitted a patch to Makefile that makes it easy to create
712        "pcre.dll" under mingw when using Configure/Make. I added stuff to
713        Makefile.am that cause it to include this special target, without
714        affecting anything else. Note that the same mingw target plus all
715        the other distribution libraries and programs are now supported
716        when configuring with CMake (see 6 below) instead of with
717        Configure/Make.
719    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
720        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
721        exported in the Windows port". It has not yet been confirmed that the patch
722        solves the problem, but it does no harm.
724    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
725        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
726        with CMake, and also correct the comment about stack recursion.
728    7.  Remove the automatic building of pcredemo from the ./configure system and
729        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
730        of a program that users should build themselves after PCRE is installed, so
731        building it automatically is not really right. What is more, it gave
732        trouble in some build environments.
734    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
737    Version 7.5 10-Jan-08
738  ---------------------  ---------------------
740  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'
741      values in parens when parsing an RE using the C++ wrapper."      values in parens when parsing an RE using the C++ wrapper."
743  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.
744      Characters greater than 255 were excluded from the class instead of being      Characters greater than 255 were excluded from the class instead of being
745      included.      included.
747  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
748      [:^space:].      [:^space:].
750    4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
751        defined or documented. It seems to have been a typo for PCRE_STATIC, so
752        I have changed it.
754    5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
755        first named subpattern) and a construct such as (?&a) would reference the
756        first named subpattern whose name started with "a" (in other words, the
757        length check was missing). Both these problems are fixed. "Subpattern name
758        expected" is now given for (?&) (a zero-length name), and this patch also
759        makes it give the same error for \k'' (previously it complained that that
760        was a reference to a non-existent subpattern).
762    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
763        this is right because (?- can be followed by option settings as well as by
764        digits. I have, however, made the messages clearer.
766    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
767        than the number used in the conditional) now cause a compile-time error.
768        This is actually not compatible with Perl, which accepts such patterns, but
769        treats the conditional as always being FALSE (as PCRE used to), but it
770        seems to me that giving a diagnostic is better.
772    8.  Change "alphameric" to the more common word "alphanumeric" in comments
773        and messages.
775    9.  Fix two occurrences of "backslash" in comments that should have been
776        "backspace".
778    10. Remove two redundant lines of code that can never be obeyed (their function
779        was moved elsewhere).
781    11. The program that makes PCRE's Unicode character property table had a bug
782        which caused it to generate incorrect table entries for sequences of
783        characters that have the same character type, but are in different scripts.
784        It amalgamated them into a single range, with the script of the first of
785        them. In other words, some characters were in the wrong script. There were
786        thirteen such cases, affecting characters in the following ranges:
788          U+002b0 - U+002c1
789          U+0060c - U+0060d
790          U+0061e - U+00612
791          U+0064b - U+0065e
792          U+0074d - U+0076d
793          U+01800 - U+01805
794          U+01d00 - U+01d77
795          U+01d9b - U+01dbf
796          U+0200b - U+0200f
797          U+030fc - U+030fe
798          U+03260 - U+0327f
799          U+0fb46 - U+0fbb1
800          U+10450 - U+1049d
802    12. The -o option (show only the matching part of a line) for pcregrep was not
803        compatible with GNU grep in that, if there was more than one match in a
804        line, it showed only the first of them. It now behaves in the same way as
805        GNU grep.
807    13. If the -o and -v options were combined for pcregrep, it printed a blank
808        line for every non-matching line. GNU grep prints nothing, and pcregrep now
809        does the same. The return code can be used to tell if there were any
810        non-matching lines.
812    14. Added --file-offsets and --line-offsets to pcregrep.
814    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
815        infinitely looping recursion. The bug was that positive lookaheads were not
816        being skipped when checking for a possible empty match (negative lookaheads
817        and both kinds of lookbehind were skipped).
819    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
820        inclusion of <windows.h> to before rather than after the definition of
821        INVALID_FILE_ATTRIBUTES (patch from David Byron).
823    17. Specifying a possessive quantifier with a specific limit for a Unicode
824        character property caused pcre_compile() to compile bad code, which led at
825        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
826        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
827        caused the error; without that there was no problem.
829    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
831    19. Added --enable-pcretest-libreadline.
833    20. In pcrecpp.cc, the variable 'count' was incremented twice in
834        RE::GlobalReplace(). As a result, the number of replacements returned was
835        double what it should be. I removed one of the increments, but Craig sent a
836        later patch that removed the other one (the right fix) and added unit tests
837        that check the return values (which was not done before).
839    21. Several CMake things:
841        (1) Arranged that, when cmake is used on Unix, the libraries end up with
842            the names libpcre and libpcreposix, not just pcre and pcreposix.
844        (2) The above change means that pcretest and pcregrep are now correctly
845            linked with the newly-built libraries, not previously installed ones.
849    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
850        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
851        UTF-8 newline character). The key issue is that the pattern starts .*;
852        this means that the match must be either at the beginning, or after a
853        newline. The bug was in the code for advancing after a failed match and
854        checking that the new position followed a newline. It was not taking
855        account of UTF-8 characters correctly.
857    23. PCRE was behaving differently from Perl in the way it recognized POSIX
858        character classes. PCRE was not treating the sequence [:...:] as a
859        character class unless the ... were all letters. Perl, however, seems to
860        allow any characters between [: and :], though of course it rejects as
861        unknown any "names" that contain non-letters, because all the known class
862        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
863        for example, whereas PCRE did not - it did not recognize a POSIX character
864        class. This seemed a bit dangerous, so the code has been changed to be
865        closer to Perl. The behaviour is not identical to Perl, because PCRE will
866        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
867        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
868        Perl does, and where it didn't before.
870    24. Rewrite so as to remove the single use of %n from pcregrep because in some
871        Windows environments %n is disabled by default.
874  Version 7.4 21-Sep-07  Version 7.4 21-Sep-07
875  ---------------------  ---------------------

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