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revision 87 by nigel, Sat Feb 24 21:41:21 2007 UTC revision 432 by ph10, Wed Sep 2 16:02:56 2009 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4    Version 8.00 ??-???-??
5    ----------------------
7    1.  The table for translating pcre_compile() error codes into POSIX error codes
8        was out-of-date, and there was no check on the pcre_compile() error code
9        being within the table. This could lead to an OK return being given in
10        error.
12    2.  Changed the call to open a subject file in pcregrep from fopen(pathname,
13        "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
14        in a Windows environment.
16    3.  The pcregrep --count option prints the count for each file even when it is
17        zero, as does GNU grep. However, pcregrep was also printing all files when
18        --files-with-matches was added. Now, when both options are given, it prints
19        counts only for those files that have at least one match. (GNU grep just
20        prints the file name in this circumstance, but including the count seems
21        more useful - otherwise, why use --count?) Also ensured that the
22        combination -clh just lists non-zero counts, with no names.
24    4.  The long form of the pcregrep -F option was incorrectly implemented as
25        --fixed_strings instead of --fixed-strings. This is an incompatible change,
26        but it seems right to fix it, and I didn't think it was worth preserving
27        the old behaviour.
29    5.  The command line items --regex=pattern and --regexp=pattern were not
30        recognized by pcregrep, which required --regex pattern or --regexp pattern
31        (with a space rather than an '='). The man page documented the '=' forms,
32        which are compatible with GNU grep; these now work.
34    6.  No libpcreposix.pc file was created for pkg-config; there was just
35        libpcre.pc and libpcrecpp.pc. The omission has been rectified.
37    7.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
38        when UCP support is not needed, by modifying the Python script that
39        generates it from Unicode data files. This should not matter if the module
40        is correctly used as a library, but I received one complaint about 50K of
41        unwanted data. My guess is that the person linked everything into his
42        program rather than using a library. Anyway, it does no harm.
44    8.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
45        was a minimum greater than 1 for a wide character in a possessive
46        repetition. The same bug could also affect patterns like /(\x{ff}{0,2})*/8
47        which had an unlimited repeat of a nested, fixed maximum repeat of a wide
48        character. Chaos in the form of incorrect output or a compiling loop could
49        result.
51    9.  The restrictions on what a pattern can contain when partial matching is
52        requested for pcre_exec() have been removed. All patterns can now be
53        partially matched by this function. In addition, if there are at least two
54        slots in the offset vector, the offsets of the first-encountered partial
55        match are set in them when PCRE_ERROR_PARTIAL is returned.
57    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
58        synonymous with PCRE_PARTIAL, for backwards compatibility, and
59        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
60        and may be more useful for multi-segment matching, especially with
61        pcre_exec().
63    11. Partial matching with pcre_exec() is now more intuitive. A partial match
64        used to be given if ever the end of the subject was reached; now it is
65        given only if matching could not proceed because another character was
66        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
67        string "Z", which now yields "no match" instead of "partial match". In the
68        case of pcre_dfa_exec(), "no match" is given if every matching path for the
69        final character ended with (*FAIL).
71    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
72        if the pattern had a "must contain" character that was already found in the
73        earlier partial match, unless partial matching was again requested. For
74        example, with the pattern /dog.(body)?/, the "must contain" character is
75        "g". If the first part-match was for the string "dog", restarting with
76        "sbody" failed.
78    13. Added a pcredemo man page, created automatically from the pcredemo.c file,
79        so that the demonstration program is easily available in environments where
80        PCRE has not been installed from source.
82    14. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
83        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
84        library.
86    15. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
87        It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
88        is not the first non-POSIX option to be added. Clearly some people find
89        these options useful.
92    Version 7.9 11-Apr-09
93    ---------------------
95    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
96        (pcretest), all targets were linked against these libraries. This included
97        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
98        libraries. This caused unwanted dependencies to be created. This problem
99        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
100        pcretest is linked with readline.
102    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
103        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
104        moved outside it again, because FALSE and TRUE are already defined in AIX,
105        but BOOL is not.
107    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
108        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
110    4.  The pcregrep documentation said spaces were inserted as well as colons (or
111        hyphens) following file names and line numbers when outputting matching
112        lines. This is not true; no spaces are inserted. I have also clarified the
113        wording for the --colour (or --color) option.
115    5.  In pcregrep, when --colour was used with -o, the list of matching strings
116        was not coloured; this is different to GNU grep, so I have changed it to be
117        the same.
119    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
120        each matching line was coloured. Now it goes on to look for further matches
121        of any of the test patterns, which is the same behaviour as GNU grep.
123    7.  A pattern that could match an empty string could cause pcregrep to loop; it
124        doesn't make sense to accept an empty string match in pcregrep, so I have
125        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
126        seems to be how GNU grep behaves.
128    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
129        start or after a newline", because the conditional assertion was not being
130        correctly handled. The rule now is that both the assertion and what follows
131        in the first alternative must satisfy the test.
133    9.  If auto-callout was enabled in a pattern with a conditional group whose
134        condition was an assertion, PCRE could crash during matching, both with
135        pcre_exec() and pcre_dfa_exec().
137    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
138        used for matching.
140    11. Unicode property support in character classes was not working for
141        characters (bytes) greater than 127 when not in UTF-8 mode.
143    12. Added the -M command line option to pcretest.
145    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
147    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
149    16. Added comments and documentation about mis-use of no_arg in the C++
150        wrapper.
152    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
153        from Martin Jerabek that uses macro names for all relevant character and
154        string constants.
156    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
157        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
158        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
159        these, but not everybody uses configure.
161    19. A conditional group that had only one branch was not being correctly
162        recognized as an item that could match an empty string. This meant that an
163        enclosing group might also not be so recognized, causing infinite looping
164        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
165        with the subject "ab", where knowledge that the repeated group can match
166        nothing is needed in order to break the loop.
168    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
169        exec(), but without supplying a callout function, matching went wrong.
171    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
172        leak if the size of the offset vector was greater than 30. When the vector
173        is smaller, the saved offsets during recursion go onto a local stack
174        vector, but for larger vectors malloc() is used. It was failing to free
175        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
176        error, in fact).
178    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
179        heapframe that is used only when UTF-8 support is enabled. This caused no
180        problem, but was untidy.
182    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
183        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
184        included within another project.
186    24. Steven Van Ingelgem's patches to add more options to the CMake support,
187        slightly modified by me:
189          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
190              not building pcregrep.
192          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
193              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
195    25. Forward references, both numeric and by name, in patterns that made use of
196        duplicate group numbers, could behave incorrectly or give incorrect errors,
197        because when scanning forward to find the reference group, PCRE was not
198        taking into account the duplicate group numbers. A pattern such as
199        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
201    26. Changed a few more instances of "const unsigned char *" to USPTR, making
202        the feature of a custom pointer more persuasive (as requested by a user).
204    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
205        pcretest.c, inside #ifndefs, because it seems they are sometimes already
206        pre-defined.
208    28. Added support for (*UTF8) at the start of a pattern.
210    29. Arrange for flags added by the "release type" setting in CMake to be shown
211        in the configuration summary.
214    Version 7.8 05-Sep-08
215    ---------------------
217    1.  Replaced UCP searching code with optimized version as implemented for Ad
218        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
219        stage table and inline lookup instead of a function, giving speed ups of 2
220        to 5 times on some simple patterns that I tested. Permission was given to
221        distribute the MultiStage2.py script that generates the tables (it's not in
222        the tarball, but is in the Subversion repository).
224    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
225        scripts.
227    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
228        a group with a zero qualifier. The result of the study could be incorrect,
229        or the function might crash, depending on the pattern.
231    4.  Caseless matching was not working for non-ASCII characters in back
232        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
233        It now works when Unicode Property Support is available.
235    5.  In pcretest, an escape such as \x{de} in the data was always generating
236        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
237        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
238        truncation.
240    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
242    7.  Added two (int) casts to pcregrep when printing the difference of two
243        pointers, in case they are 64-bit values.
245    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
246        test 2 if it fails.
248    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
249        and a #define of that name to empty if it is not externally set. This is to
250        allow users of MSVC to set it if necessary.
252    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
253        the convenience functions in the pcre_get.c source file.
255    11. An option change at the start of a pattern that had top-level alternatives
256        could cause overwriting and/or a crash. This command provoked a crash in
257        some environments:
259          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
261        This potential security problem was recorded as CVE-2008-2371.
263    12. For a pattern where the match had to start at the beginning or immediately
264        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
265        pcre_dfa_exec() could read past the end of the passed subject if there was
266        no match. To help with detecting such bugs (e.g. with valgrind), I modified
267        pcretest so that it places the subject at the end of its malloc-ed buffer.
269    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
270        exec() might read past the end of the data buffer in UTF-8 mode.
272    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
273        the data contained the byte 0x85 as part of a UTF-8 character within its
274        first line. This applied both to normal and DFA matching.
276    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
277        /^[^d]*?$/8 failed to match "abc".
279    16. Added a missing copyright notice to pcrecpp_internal.h.
281    17. Make it more clear in the documentation that values returned from
282        pcre_exec() in ovector are byte offsets, not character counts.
284    18. Tidied a few places to stop certain compilers from issuing warnings.
286    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
287        supplied by Stefan Weber. I made a further small update for 7.8 because
288        there is a change of source arrangements: the pcre_searchfuncs.c module is
289        replaced by pcre_ucd.c.
292    Version 7.7 07-May-08
293    ---------------------
295    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
296        a string to a long long, pretend we don't even have a long long." This is
297        done by checking for the strtoq, strtoll, and _strtoi64 functions.
299    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
300        pre-7.6 versions, which defined a global no_arg variable instead of putting
301        it in the RE class. (See also #8 below.)
303    3.  Remove a line of dead code, identified by coverity and reported by Nuno
304        Lopes.
306    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
308        (1) The include/exclude patterns were being applied to the whole pathnames
309            of files, instead of just to the final components.
311        (2) If there was more than one level of directory, the subdirectories were
312            skipped unless they satisfied the include/exclude conditions. This is
313            inconsistent with GNU grep (and could even be seen as contrary to the
314            pcregrep specification - which I improved to make it absolutely clear).
315            The action now is always to scan all levels of directory, and just
316            apply the include/exclude patterns to regular files.
318    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
319        --exclude_dir in the tests to avoid scanning .svn directories.
321    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
322        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
323        doesn't support NULs in patterns.
325    7.  Added some missing "const"s to declarations of static tables in
326        pcre_compile.c and pcre_dfa_exec.c.
328    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
329        caused by fix #2  above. (Subsequently also a second patch to fix the
330        first patch. And a third patch - this was a messy problem.)
332    9.  Applied Craig's patch to remove the use of push_back().
334    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
335        matching function regexec().
337    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
338        which, however, unlike Perl's \g{...}, are subroutine calls, not back
339        references. PCRE supports relative numbers with this syntax (I don't think
340        Oniguruma does).
342    12. Previously, a group with a zero repeat such as (...){0} was completely
343        omitted from the compiled regex. However, this means that if the group
344        was called as a subroutine from elsewhere in the pattern, things went wrong
345        (an internal error was given). Such groups are now left in the compiled
346        pattern, with a new opcode that causes them to be skipped at execution
347        time.
349    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
350        to the way PCRE behaves:
352        (a) A lone ] character is dis-allowed (Perl treats it as data).
354        (b) A back reference to an unmatched subpattern matches an empty string
355            (Perl fails the current match path).
357        (c) A data ] in a character class must be notated as \] because if the
358            first data character in a class is ], it defines an empty class. (In
359            Perl it is not possible to have an empty class.) The empty class []
360            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
361            The negative empty class [^] matches any one character, independently
362            of the DOTALL setting.
364    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
365        non-existent subpattern following a character class starting with ']' and
366        containing () gave an internal compiling error instead of "reference to
367        non-existent subpattern". Fortunately, when the pattern did exist, the
368        compiled code was correct. (When scanning forwards to check for the
369        existencd of the subpattern, it was treating the data ']' as terminating
370        the class, so got the count wrong. When actually compiling, the reference
371        was subsequently set up correctly.)
373    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
374        it was being rejected as not supported by pcre_dfa_exec(), even though
375        other assertions are supported. I have made pcre_dfa_exec() support
376        (*FAIL).
378    16. The implementation of 13c above involved the invention of a new opcode,
379        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
380        cannot be changed at match time, I realized I could make a small
381        improvement to matching performance by compiling OP_ALLANY instead of
382        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
383        on the OP_ANY path.
385    17. Compiling pcretest on Windows with readline support failed without the
386        following two fixes: (1) Make the unistd.h include conditional on
387        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
389    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
390        ncurses library to be included for pcretest when ReadLine support is
391        requested, but also to allow for it to be overridden. This patch came from
392        Daniel Bergström.
394    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
395        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
396        any errors with the current Unicode tables. Thanks to Peter Kankowski for
397        spotting this.
400    Version 7.6 28-Jan-08
401    ---------------------
403    1.  A character class containing a very large number of characters with
404        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
405        overflow.
407    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
408        HAVE_LONG_LONG is not defined.
410    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
411        bring them up to date and include new features. This patch includes:
413        - Fixed PH's badly added libz and libbz2 support.
414        - Fixed a problem with static linking.
415        - Added pcredemo. [But later removed - see 7 below.]
416        - Fixed dftables problem and added an option.
417        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
418            HAVE_LONG_LONG.
419        - Added readline support for pcretest.
420        - Added an listing of the option settings after cmake has run.
422    4.  A user submitted a patch to Makefile that makes it easy to create
423        "pcre.dll" under mingw when using Configure/Make. I added stuff to
424        Makefile.am that cause it to include this special target, without
425        affecting anything else. Note that the same mingw target plus all
426        the other distribution libraries and programs are now supported
427        when configuring with CMake (see 6 below) instead of with
428        Configure/Make.
430    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
431        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
432        exported in the Windows port". It has not yet been confirmed that the patch
433        solves the problem, but it does no harm.
435    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
436        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
437        with CMake, and also correct the comment about stack recursion.
439    7.  Remove the automatic building of pcredemo from the ./configure system and
440        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
441        of a program that users should build themselves after PCRE is installed, so
442        building it automatically is not really right. What is more, it gave
443        trouble in some build environments.
445    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
448    Version 7.5 10-Jan-08
449    ---------------------
451    1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
452        values in parens when parsing an RE using the C++ wrapper."
454    2.  Negative specials like \S did not work in character classes in UTF-8 mode.
455        Characters greater than 255 were excluded from the class instead of being
456        included.
458    3.  The same bug as (2) above applied to negated POSIX classes such as
459        [:^space:].
461    4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
462        defined or documented. It seems to have been a typo for PCRE_STATIC, so
463        I have changed it.
465    5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
466        first named subpattern) and a construct such as (?&a) would reference the
467        first named subpattern whose name started with "a" (in other words, the
468        length check was missing). Both these problems are fixed. "Subpattern name
469        expected" is now given for (?&) (a zero-length name), and this patch also
470        makes it give the same error for \k'' (previously it complained that that
471        was a reference to a non-existent subpattern).
473    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
474        this is right because (?- can be followed by option settings as well as by
475        digits. I have, however, made the messages clearer.
477    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
478        than the number used in the conditional) now cause a compile-time error.
479        This is actually not compatible with Perl, which accepts such patterns, but
480        treats the conditional as always being FALSE (as PCRE used to), but it
481        seems to me that giving a diagnostic is better.
483    8.  Change "alphameric" to the more common word "alphanumeric" in comments
484        and messages.
486    9.  Fix two occurrences of "backslash" in comments that should have been
487        "backspace".
489    10. Remove two redundant lines of code that can never be obeyed (their function
490        was moved elsewhere).
492    11. The program that makes PCRE's Unicode character property table had a bug
493        which caused it to generate incorrect table entries for sequences of
494        characters that have the same character type, but are in different scripts.
495        It amalgamated them into a single range, with the script of the first of
496        them. In other words, some characters were in the wrong script. There were
497        thirteen such cases, affecting characters in the following ranges:
499          U+002b0 - U+002c1
500          U+0060c - U+0060d
501          U+0061e - U+00612
502          U+0064b - U+0065e
503          U+0074d - U+0076d
504          U+01800 - U+01805
505          U+01d00 - U+01d77
506          U+01d9b - U+01dbf
507          U+0200b - U+0200f
508          U+030fc - U+030fe
509          U+03260 - U+0327f
510          U+0fb46 - U+0fbb1
511          U+10450 - U+1049d
513    12. The -o option (show only the matching part of a line) for pcregrep was not
514        compatible with GNU grep in that, if there was more than one match in a
515        line, it showed only the first of them. It now behaves in the same way as
516        GNU grep.
518    13. If the -o and -v options were combined for pcregrep, it printed a blank
519        line for every non-matching line. GNU grep prints nothing, and pcregrep now
520        does the same. The return code can be used to tell if there were any
521        non-matching lines.
523    14. Added --file-offsets and --line-offsets to pcregrep.
525    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
526        infinitely looping recursion. The bug was that positive lookaheads were not
527        being skipped when checking for a possible empty match (negative lookaheads
528        and both kinds of lookbehind were skipped).
530    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
531        inclusion of <windows.h> to before rather than after the definition of
532        INVALID_FILE_ATTRIBUTES (patch from David Byron).
534    17. Specifying a possessive quantifier with a specific limit for a Unicode
535        character property caused pcre_compile() to compile bad code, which led at
536        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
537        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
538        caused the error; without that there was no problem.
540    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
542    19. Added --enable-pcretest-libreadline.
544    20. In pcrecpp.cc, the variable 'count' was incremented twice in
545        RE::GlobalReplace(). As a result, the number of replacements returned was
546        double what it should be. I removed one of the increments, but Craig sent a
547        later patch that removed the other one (the right fix) and added unit tests
548        that check the return values (which was not done before).
550    21. Several CMake things:
552        (1) Arranged that, when cmake is used on Unix, the libraries end up with
553            the names libpcre and libpcreposix, not just pcre and pcreposix.
555        (2) The above change means that pcretest and pcregrep are now correctly
556            linked with the newly-built libraries, not previously installed ones.
560    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
561        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
562        UTF-8 newline character). The key issue is that the pattern starts .*;
563        this means that the match must be either at the beginning, or after a
564        newline. The bug was in the code for advancing after a failed match and
565        checking that the new position followed a newline. It was not taking
566        account of UTF-8 characters correctly.
568    23. PCRE was behaving differently from Perl in the way it recognized POSIX
569        character classes. PCRE was not treating the sequence [:...:] as a
570        character class unless the ... were all letters. Perl, however, seems to
571        allow any characters between [: and :], though of course it rejects as
572        unknown any "names" that contain non-letters, because all the known class
573        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
574        for example, whereas PCRE did not - it did not recognize a POSIX character
575        class. This seemed a bit dangerous, so the code has been changed to be
576        closer to Perl. The behaviour is not identical to Perl, because PCRE will
577        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
578        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
579        Perl does, and where it didn't before.
581    24. Rewrite so as to remove the single use of %n from pcregrep because in some
582        Windows environments %n is disabled by default.
585    Version 7.4 21-Sep-07
586    ---------------------
588    1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This
589        means that a class such as [\s] counted as "explicit reference to CR or
590        LF". That isn't really right - the whole point of the change was to try to
591        help when there was an actual mention of one of the two characters. So now
592        the change happens only if \r or \n (or a literal CR or LF) character is
593        encountered.
595    2.  The 32-bit options word was also used for 6 internal flags, but the numbers
596        of both had grown to the point where there were only 3 bits left.
597        Fortunately, there was spare space in the data structure, and so I have
598        moved the internal flags into a new 16-bit field to free up more option
599        bits.
601    3.  The appearance of (?J) at the start of a pattern set the DUPNAMES option,
602        but did not set the internal JCHANGED flag - either of these is enough to
603        control the way the "get" function works - but the PCRE_INFO_JCHANGED
604        facility is supposed to tell if (?J) was ever used, so now (?J) at the
605        start sets both bits.
607    4.  Added options (at build time, compile time, exec time) to change \R from
608        matching any Unicode line ending sequence to just matching CR, LF, or CRLF.
610    5.  doc/pcresyntax.html was missing from the distribution.
612    6.  Put back the definition of PCRE_ERROR_NULLWSLIMIT, for backward
613        compatibility, even though it is no longer used.
615    7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and
616        strtoull to pcrecpp.cc to select the available functions in WIN32 when the
617        windows.h file is present (where different names are used). [This was
618        reversed later after testing - see 16 below.]
620    8.  Changed all #include <config.h> to #include "config.h". There were also
621        some further <pcre.h> cases that I changed to "pcre.h".
623    9.  When pcregrep was used with the --colour option, it missed the line ending
624        sequence off the lines that it output.
626    10. It was pointed out to me that arrays of string pointers cause lots of
627        relocations when a shared library is dynamically loaded. A technique of
628        using a single long string with a table of offsets can drastically reduce
629        these. I have refactored PCRE in four places to do this. The result is
630        dramatic:
632          Originally:                          290
633          After changing UCP table:            187
634          After changing error message table:   43
635          After changing table of "verbs"       36
636          After changing table of Posix names   22
638        Thanks to the folks working on Gregex for glib for this insight.
640    11. --disable-stack-for-recursion caused compiling to fail unless -enable-
641        unicode-properties was also set.
643    12. Updated the tests so that they work when \R is defaulted to ANYCRLF.
645    13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously
646        checked only for CRLF.
648    14. Added casts to pcretest.c to avoid compiler warnings.
650    15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
652    16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
653        and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
654        entirely. This removes changes made in 7 above.
656    17. The CMake files have been updated, and there is now more information about
657        building with CMake in the NON-UNIX-USE document.
660    Version 7.3 28-Aug-07
661    ---------------------
663     1. In the rejigging of the build system that eventually resulted in 7.1, the
664        line "#include <pcre.h>" was included in pcre_internal.h. The use of angle
665        brackets there is not right, since it causes compilers to look for an
666        installed pcre.h, not the version that is in the source that is being
667        compiled (which of course may be different). I have changed it back to:
669          #include "pcre.h"
671        I have a vague recollection that the change was concerned with compiling in
672        different directories, but in the new build system, that is taken care of
673        by the VPATH setting the Makefile.
675     2. The pattern .*$ when run in not-DOTALL UTF-8 mode with newline=any failed
676        when the subject happened to end in the byte 0x85 (e.g. if the last
677        character was \x{1ec5}). *Character* 0x85 is one of the "any" newline
678        characters but of course it shouldn't be taken as a newline when it is part
679        of another character. The bug was that, for an unlimited repeat of . in
680        not-DOTALL UTF-8 mode, PCRE was advancing by bytes rather than by
681        characters when looking for a newline.
683     3. A small performance improvement in the DOTALL UTF-8 mode .* case.
685     4. Debugging: adjusted the names of opcodes for different kinds of parentheses
686        in debug output.
688     5. Arrange to use "%I64d" instead of "%lld" and "%I64u" instead of "%llu" for
689        long printing in the pcrecpp unittest when running under MinGW.
691     6. ESC_K was left out of the EBCDIC table.
693     7. Change 7.0/38 introduced a new limit on the number of nested non-capturing
694        parentheses; I made it 1000, which seemed large enough. Unfortunately, the
695        limit also applies to "virtual nesting" when a pattern is recursive, and in
696        this case 1000 isn't so big. I have been able to remove this limit at the
697        expense of backing off one optimization in certain circumstances. Normally,
698        when pcre_exec() would call its internal match() function recursively and
699        immediately return the result unconditionally, it uses a "tail recursion"
700        feature to save stack. However, when a subpattern that can match an empty
701        string has an unlimited repetition quantifier, it no longer makes this
702        optimization. That gives it a stack frame in which to save the data for
703        checking that an empty string has been matched. Previously this was taken
704        from the 1000-entry workspace that had been reserved. So now there is no
705        explicit limit, but more stack is used.
707     8. Applied Daniel's patches to solve problems with the import/export magic
708        syntax that is required for Windows, and which was going wrong for the
709        pcreposix and pcrecpp parts of the library. These were overlooked when this
710        problem was solved for the main library.
712     9. There were some crude static tests to avoid integer overflow when computing
713        the size of patterns that contain repeated groups with explicit upper
714        limits. As the maximum quantifier is 65535, the maximum group length was
715        set at 30,000 so that the product of these two numbers did not overflow a
716        32-bit integer. However, it turns out that people want to use groups that
717        are longer than 30,000 bytes (though not repeat them that many times).
718        Change 7.0/17 (the refactoring of the way the pattern size is computed) has
719        made it possible to implement the integer overflow checks in a much more
720        dynamic way, which I have now done. The artificial limitation on group
721        length has been removed - we now have only the limit on the total length of
722        the compiled pattern, which depends on the LINK_SIZE setting.
724    10. Fixed a bug in the documentation for get/copy named substring when
725        duplicate names are permitted. If none of the named substrings are set, the
726        functions return PCRE_ERROR_NOSUBSTRING (7); the doc said they returned an
727        empty string.
729    11. Because Perl interprets \Q...\E at a high level, and ignores orphan \E
730        instances, patterns such as [\Q\E] or [\E] or even [^\E] cause an error,
731        because the ] is interpreted as the first data character and the
732        terminating ] is not found. PCRE has been made compatible with Perl in this
733        regard. Previously, it interpreted [\Q\E] as an empty class, and [\E] could
734        cause memory overwriting.
736    10. Like Perl, PCRE automatically breaks an unlimited repeat after an empty
737        string has been matched (to stop an infinite loop). It was not recognizing
738        a conditional subpattern that could match an empty string if that
739        subpattern was within another subpattern. For example, it looped when
740        trying to match  (((?(1)X|))*)  but it was OK with  ((?(1)X|)*)  where the
741        condition was not nested. This bug has been fixed.
743    12. A pattern like \X?\d or \P{L}?\d in non-UTF-8 mode could cause a backtrack
744        past the start of the subject in the presence of bytes with the top bit
745        set, for example "\x8aBCD".
747    13. Added Perl 5.10 experimental backtracking controls (*FAIL), (*F), (*PRUNE),
748        (*SKIP), (*THEN), (*COMMIT), and (*ACCEPT).
750    14. Optimized (?!) to (*FAIL).
752    15. Updated the test for a valid UTF-8 string to conform to the later RFC 3629.
753        This restricts code points to be within the range 0 to 0x10FFFF, excluding
754        the "low surrogate" sequence 0xD800 to 0xDFFF. Previously, PCRE allowed the
755        full range 0 to 0x7FFFFFFF, as defined by RFC 2279. Internally, it still
756        does: it's just the validity check that is more restrictive.
758    16. Inserted checks for integer overflows during escape sequence (backslash)
759        processing, and also fixed erroneous offset values for syntax errors during
760        backslash processing.
762    17. Fixed another case of looking too far back in non-UTF-8 mode (cf 12 above)
763        for patterns like [\PPP\x8a]{1,}\x80 with the subject "A\x80".
765    18. An unterminated class in a pattern like (?1)\c[ with a "forward reference"
766        caused an overrun.
768    19. A pattern like (?:[\PPa*]*){8,} which had an "extended class" (one with
769        something other than just ASCII characters) inside a group that had an
770        unlimited repeat caused a loop at compile time (while checking to see
771        whether the group could match an empty string).
773    20. Debugging a pattern containing \p or \P could cause a crash. For example,
774        [\P{Any}] did so. (Error in the code for printing property names.)
776    21. An orphan \E inside a character class could cause a crash.
778    22. A repeated capturing bracket such as (A)? could cause a wild memory
779        reference during compilation.
781    23. There are several functions in pcre_compile() that scan along a compiled
782        expression for various reasons (e.g. to see if it's fixed length for look
783        behind). There were bugs in these functions when a repeated \p or \P was
784        present in the pattern. These operators have additional parameters compared
785        with \d, etc, and these were not being taken into account when moving along
786        the compiled data. Specifically:
788        (a) A item such as \p{Yi}{3} in a lookbehind was not treated as fixed
789            length.
791        (b) An item such as \pL+ within a repeated group could cause crashes or
792            loops.
794        (c) A pattern such as \p{Yi}+(\P{Yi}+)(?1) could give an incorrect
795            "reference to non-existent subpattern" error.
797        (d) A pattern like (\P{Yi}{2}\277)? could loop at compile time.
799    24. A repeated \S or \W in UTF-8 mode could give wrong answers when multibyte
800        characters were involved (for example /\S{2}/8g with "A\x{a3}BC").
802    25. Using pcregrep in multiline, inverted mode (-Mv) caused it to loop.
804    26. Patterns such as [\P{Yi}A] which include \p or \P and just one other
805        character were causing crashes (broken optimization).
807    27. Patterns such as (\P{Yi}*\277)* (group with possible zero repeat containing
808        \p or \P) caused a compile-time loop.
810    28. More problems have arisen in unanchored patterns when CRLF is a valid line
811        break. For example, the unstudied pattern [\r\n]A does not match the string
812        "\r\nA" because change 7.0/46 below moves the current point on by two
813        characters after failing to match at the start. However, the pattern \nA
814        *does* match, because it doesn't start till \n, and if [\r\n]A is studied,
815        the same is true. There doesn't seem any very clean way out of this, but
816        what I have chosen to do makes the common cases work: PCRE now takes note
817        of whether there can be an explicit match for \r or \n anywhere in the
818        pattern, and if so, 7.0/46 no longer applies. As part of this change,
819        there's a new PCRE_INFO_HASCRORLF option for finding out whether a compiled
820        pattern has explicit CR or LF references.
822    29. Added (*CR) etc for changing newline setting at start of pattern.
825    Version 7.2 19-Jun-07
826    ---------------------
828     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
829        which is apparently normally available under Windows.
831     2. Re-jig the pcregrep tests with different newline settings in an attempt
832        to make them independent of the local environment's newline setting.
834     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
836     4. Some of the "internals" tests were previously cut out when the link size
837        was not 2, because the output contained actual offsets. The recent new
838        "Z" feature of pcretest means that these can be cut out, making the tests
839        usable with all link sizes.
841     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
842        stack recursion. This gives a massive performance boost under BSD, but just
843        a small improvement under Linux. However, it saves one field in the frame
844        in all cases.
846     6. Added more features from the forthcoming Perl 5.10:
848        (a) (?-n) (where n is a string of digits) is a relative subroutine or
849            recursion call. It refers to the nth most recently opened parentheses.
851        (b) (?+n) is also a relative subroutine call; it refers to the nth next
852            to be opened parentheses.
854        (c) Conditions that refer to capturing parentheses can be specified
855            relatively, for example, (?(-2)... or (?(+3)...
857        (d) \K resets the start of the current match so that everything before
858            is not part of it.
860        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
862        (f) \g{name} is another synonym - part of Perl 5.10's unification of
863            reference syntax.
865        (g) (?| introduces a group in which the numbering of parentheses in each
866            alternative starts with the same number.
868        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
870     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
873     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
874        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
875        for detecting groups that can match an empty string.
877     9. A pattern with a very large number of alternatives (more than several
878        hundred) was running out of internal workspace during the pre-compile
879        phase, where pcre_compile() figures out how much memory will be needed. A
880        bit of new cunning has reduced the workspace needed for groups with
881        alternatives. The 1000-alternative test pattern now uses 12 bytes of
882        workspace instead of running out of the 4096 that are available.
884    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
886    11. Applied patch from Google to remove an optimization that didn't quite work.
887        The report of the bug said:
889          pcrecpp::RE("a*").FullMatch("aaa") matches, while
890          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
891          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
893    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
894        it matched the wrong number of bytes.
897    Version 7.1 24-Apr-07
898    ---------------------
900     1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
901        that is more "standard", making use of automake and other Autotools. There
902        is some re-arrangement of the files and adjustment of comments consequent
903        on this.
905     2. Part of the patch fixed a problem with the pcregrep tests. The test of -r
906        for recursive directory scanning broke on some systems because the files
907        are not scanned in any specific order and on different systems the order
908        was different. A call to "sort" has been inserted into RunGrepTest for the
909        approprate test as a short-term fix. In the longer term there may be an
910        alternative.
912     3. I had an email from Eric Raymond about problems translating some of PCRE's
913        man pages to HTML (despite the fact that I distribute HTML pages, some
914        people do their own conversions for various reasons). The problems
915        concerned the use of low-level troff macros .br and .in. I have therefore
916        removed all such uses from the man pages (some were redundant, some could
917        be replaced by .nf/.fi pairs). The 132html script that I use to generate
918        HTML has been updated to handle .nf/.fi and to complain if it encounters
919        .br or .in.
921     4. Updated comments in configure.ac that get placed in config.h.in and also
922        arranged for config.h to be included in the distribution, with the name
923        config.h.generic, for the benefit of those who have to compile without
924        Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
926     5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan
927        Weber: (1) pcre_internal.h was missing some function renames; (2) updated
928        makevp.bat for the current PCRE, using the additional files
929        makevp_c.txt, makevp_l.txt, and pcregexp.pas.
931     6. A Windows user reported a minor discrepancy with test 2, which turned out
932        to be caused by a trailing space on an input line that had got lost in his
933        copy. The trailing space was an accident, so I've just removed it.
935     7. Add -Wl,-R... flags in pcre-config.in for *BSD* systems, as I'm told
936        that is needed.
938     8. Mark ucp_table (in ucptable.h) and ucp_gentype (in pcre_ucp_searchfuncs.c)
939        as "const" (a) because they are and (b) because it helps the PHP
940        maintainers who have recently made a script to detect big data structures
941        in the php code that should be moved to the .rodata section. I remembered
942        to update Builducptable as well, so it won't revert if ucptable.h is ever
943        re-created.
945     9. Added some extra #ifdef SUPPORT_UTF8 conditionals into pcretest.c,
946        pcre_printint.src, pcre_compile.c, pcre_study.c, and pcre_tables.c, in
947        order to be able to cut out the UTF-8 tables in the latter when UTF-8
948        support is not required. This saves 1.5-2K of code, which is important in
949        some applications.
951        Later: more #ifdefs are needed in pcre_ord2utf8.c and pcre_valid_utf8.c
952        so as not to refer to the tables, even though these functions will never be
953        called when UTF-8 support is disabled. Otherwise there are problems with a
954        shared library.
956    10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:
958        (a) It was defining its arguments as char * instead of void *.
960        (b) It was assuming that all moves were upwards in memory; this was true
961            a long time ago when I wrote it, but is no longer the case.
963        The emulated memove() is provided for those environments that have neither
964        memmove() nor bcopy(). I didn't think anyone used it these days, but that
965        is clearly not the case, as these two bugs were recently reported.
967    11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
968        and Detrail to create the HTML documentation, the .txt form of the man
969        pages, and it removes trailing spaces from listed files. It also creates
970        pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter
971        case, it wraps all the #defines with #ifndefs. This script should be run
972        before "make dist".
974    12. Fixed two fairly obscure bugs concerned with quantified caseless matching
975        with Unicode property support.
977        (a) For a maximizing quantifier, if the two different cases of the
978            character were of different lengths in their UTF-8 codings (there are
979            some cases like this - I found 11), and the matching function had to
980            back up over a mixture of the two cases, it incorrectly assumed they
981            were both the same length.
983        (b) When PCRE was configured to use the heap rather than the stack for
984            recursion during matching, it was not correctly preserving the data for
985            the other case of a UTF-8 character when checking ahead for a match
986            while processing a minimizing repeat. If the check also involved
987            matching a wide character, but failed, corruption could cause an
988            erroneous result when trying to check for a repeat of the original
989            character.
991    13. Some tidying changes to the testing mechanism:
993        (a) The RunTest script now detects the internal link size and whether there
994            is UTF-8 and UCP support by running ./pcretest -C instead of relying on
995            values substituted by "configure". (The RunGrepTest script already did
996            this for UTF-8.) The configure.ac script no longer substitutes the
997            relevant variables.
999        (b) The debugging options /B and /D in pcretest show the compiled bytecode
1000            with length and offset values. This means that the output is different
1001            for different internal link sizes. Test 2 is skipped for link sizes
1002            other than 2 because of this, bypassing the problem. Unfortunately,
1003            there was also a test in test 3 (the locale tests) that used /B and
1004            failed for link sizes other than 2. Rather than cut the whole test out,
1005            I have added a new /Z option to pcretest that replaces the length and
1006            offset values with spaces. This is now used to make test 3 independent
1007            of link size. (Test 2 will be tidied up later.)
1009    14. If erroroffset was passed as NULL to pcre_compile, it provoked a
1010        segmentation fault instead of returning the appropriate error message.
1012    15. In multiline mode when the newline sequence was set to "any", the pattern
1013        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
1014        This doesn't seem right; it now treats the CRLF combination as the line
1015        ending, and so does not match in that case. It's only a pattern such as ^$
1016        that would hit this one: something like ^ABC$ would have failed after \r
1017        and then tried again after \r\n.
1019    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
1020        in an attempt to make files that differ only in their line terminators
1021        compare equal. This works on Linux.
1023    17. Under certain error circumstances pcregrep might try to free random memory
1024        as it exited. This is now fixed, thanks to valgrind.
1026    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
1027        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
1028        was because its rules for how to advance for /g after matching an empty
1029        string at the end of a line did not allow for this case. They now check for
1030        it specially.
1032    20. pcretest is supposed to handle patterns and data of any length, by
1033        extending its buffers when necessary. It was getting this wrong when the
1034        buffer for a data line had to be extended.
1036    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
1037        CRLF as a newline sequence.
1039    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
1040        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
1041        I have nevertheless tidied it up.
1043    23. Added some casts to kill warnings from HP-UX ia64 compiler.
1045    24. Added a man page for pcre-config.
1048    Version 7.0 19-Dec-06
1049    ---------------------
1051     1. Fixed a signed/unsigned compiler warning in pcre_compile.c, shown up by
1052        moving to gcc 4.1.1.
1054     2. The -S option for pcretest uses setrlimit(); I had omitted to #include
1055        sys/time.h, which is documented as needed for this function. It doesn't
1056        seem to matter on Linux, but it showed up on some releases of OS X.
1058     3. It seems that there are systems where bytes whose values are greater than
1059        127 match isprint() in the "C" locale. The "C" locale should be the
1060        default when a C program starts up. In most systems, only ASCII printing
1061        characters match isprint(). This difference caused the output from pcretest
1062        to vary, making some of the tests fail. I have changed pcretest so that:
1064        (a) When it is outputting text in the compiled version of a pattern, bytes
1065            other than 32-126 are always shown as hex escapes.
1067        (b) When it is outputting text that is a matched part of a subject string,
1068            it does the same, unless a different locale has been set for the match
1069            (using the /L modifier). In this case, it uses isprint() to decide.
1071     4. Fixed a major bug that caused incorrect computation of the amount of memory
1072        required for a compiled pattern when options that changed within the
1073        pattern affected the logic of the preliminary scan that determines the
1074        length. The relevant options are -x, and -i in UTF-8 mode. The result was
1075        that the computed length was too small. The symptoms of this bug were
1076        either the PCRE error "internal error: code overflow" from pcre_compile(),
1077        or a glibc crash with a message such as "pcretest: free(): invalid next
1078        size (fast)". Examples of patterns that provoked this bug (shown in
1079        pcretest format) are:
1081          /(?-x: )/x
1082          /(?x)(?-x: \s*#\s*)/
1083          /((?i)[\x{c0}])/8
1084          /(?i:[\x{c0}])/8
1086        HOWEVER: Change 17 below makes this fix obsolete as the memory computation
1087        is now done differently.
1089     5. Applied patches from Google to: (a) add a QuoteMeta function to the C++
1090        wrapper classes; (b) implement a new function in the C++ scanner that is
1091        more efficient than the old way of doing things because it avoids levels of
1092        recursion in the regex matching; (c) add a paragraph to the documentation
1093        for the FullMatch() function.
1095     6. The escape sequence \n was being treated as whatever was defined as
1096        "newline". Not only was this contrary to the documentation, which states
1097        that \n is character 10 (hex 0A), but it also went horribly wrong when
1098        "newline" was defined as CRLF. This has been fixed.
1100     7. In pcre_dfa_exec.c the value of an unsigned integer (the variable called c)
1101        was being set to -1 for the "end of line" case (supposedly a value that no
1102        character can have). Though this value is never used (the check for end of
1103        line is "zero bytes in current character"), it caused compiler complaints.
1104        I've changed it to 0xffffffff.
1106     8. In pcre_version.c, the version string was being built by a sequence of
1107        C macros that, in the event of PCRE_PRERELEASE being defined as an empty
1108        string (as it is for production releases) called a macro with an empty
1109        argument. The C standard says the result of this is undefined. The gcc
1110        compiler treats it as an empty string (which was what was wanted) but it is
1111        reported that Visual C gives an error. The source has been hacked around to
1112        avoid this problem.
1114     9. On the advice of a Windows user, included <io.h> and <fcntl.h> in Windows
1115        builds of pcretest, and changed the call to _setmode() to use _O_BINARY
1116        instead of 0x8000. Made all the #ifdefs test both _WIN32 and WIN32 (not all
1117        of them did).
1119    10. Originally, pcretest opened its input and output without "b"; then I was
1120        told that "b" was needed in some environments, so it was added for release
1121        5.0 to both the input and output. (It makes no difference on Unix-like
1122        systems.) Later I was told that it is wrong for the input on Windows. I've
1123        now abstracted the modes into two macros, to make it easier to fiddle with
1124        them, and removed "b" from the input mode under Windows.
1126    11. Added pkgconfig support for the C++ wrapper library, libpcrecpp.
1128    12. Added -help and --help to pcretest as an official way of being reminded
1129        of the options.
1131    13. Removed some redundant semicolons after macro calls in pcrecpparg.h.in
1132        and pcrecpp.cc because they annoy compilers at high warning levels.
1134    14. A bit of tidying/refactoring in pcre_exec.c in the main bumpalong loop.
1136    15. Fixed an occurrence of == in configure.ac that should have been = (shell
1137        scripts are not C programs :-) and which was not noticed because it works
1138        on Linux.
1140    16. pcretest is supposed to handle any length of pattern and data line (as one
1141        line or as a continued sequence of lines) by extending its input buffer if
1142        necessary. This feature was broken for very long pattern lines, leading to
1143        a string of junk being passed to pcre_compile() if the pattern was longer
1144        than about 50K.
1146    17. I have done a major re-factoring of the way pcre_compile() computes the
1147        amount of memory needed for a compiled pattern. Previously, there was code
1148        that made a preliminary scan of the pattern in order to do this. That was
1149        OK when PCRE was new, but as the facilities have expanded, it has become
1150        harder and harder to keep it in step with the real compile phase, and there
1151        have been a number of bugs (see for example, 4 above). I have now found a
1152        cunning way of running the real compile function in a "fake" mode that
1153        enables it to compute how much memory it would need, while actually only
1154        ever using a few hundred bytes of working memory and without too many
1155        tests of the mode. This should make future maintenance and development
1156        easier. A side effect of this work is that the limit of 200 on the nesting
1157        depth of parentheses has been removed (though this was never a serious
1158        limitation, I suspect). However, there is a downside: pcre_compile() now
1159        runs more slowly than before (30% or more, depending on the pattern). I
1160        hope this isn't a big issue. There is no effect on runtime performance.
1162    18. Fixed a minor bug in pcretest: if a pattern line was not terminated by a
1163        newline (only possible for the last line of a file) and it was a
1164        pattern that set a locale (followed by /Lsomething), pcretest crashed.
1166    19. Added additional timing features to pcretest. (1) The -tm option now times
1167        matching only, not compiling. (2) Both -t and -tm can be followed, as a
1168        separate command line item, by a number that specifies the number of
1169        repeats to use when timing. The default is 50000; this gives better
1170        precision, but takes uncomfortably long for very large patterns.
1172    20. Extended pcre_study() to be more clever in cases where a branch of a
1173        subpattern has no definite first character. For example, (a*|b*)[cd] would
1174        previously give no result from pcre_study(). Now it recognizes that the
1175        first character must be a, b, c, or d.
1177    21. There was an incorrect error "recursive call could loop indefinitely" if
1178        a subpattern (or the entire pattern) that was being tested for matching an
1179        empty string contained only one non-empty item after a nested subpattern.
1180        For example, the pattern (?>\x{100}*)\d(?R) provoked this error
1181        incorrectly, because the \d was being skipped in the check.
1183    22. The pcretest program now has a new pattern option /B and a command line
1184        option -b, which is equivalent to adding /B to every pattern. This causes
1185        it to show the compiled bytecode, without the additional information that
1186        -d shows. The effect of -d is now the same as -b with -i (and similarly, /D
1187        is the same as /B/I).
1189    23. A new optimization is now able automatically to treat some sequences such
1190        as a*b as a*+b. More specifically, if something simple (such as a character
1191        or a simple class like \d) has an unlimited quantifier, and is followed by
1192        something that cannot possibly match the quantified thing, the quantifier
1193        is automatically "possessified".
1195    24. A recursive reference to a subpattern whose number was greater than 39
1196        went wrong under certain circumstances in UTF-8 mode. This bug could also
1197        have affected the operation of pcre_study().
1199    25. Realized that a little bit of performance could be had by replacing
1200        (c & 0xc0) == 0xc0 with c >= 0xc0 when processing UTF-8 characters.
1202    26. Timing data from pcretest is now shown to 4 decimal places instead of 3.
1204    27. Possessive quantifiers such as a++ were previously implemented by turning
1205        them into atomic groups such as ($>a+). Now they have their own opcodes,
1206        which improves performance. This includes the automatically created ones
1207        from 23 above.
1209    28. A pattern such as (?=(\w+))\1: which simulates an atomic group using a
1210        lookahead was broken if it was not anchored. PCRE was mistakenly expecting
1211        the first matched character to be a colon. This applied both to named and
1212        numbered groups.
1214    29. The ucpinternal.h header file was missing its idempotency #ifdef.
1216    30. I was sent a "project" file called libpcre.a.dev which I understand makes
1217        building PCRE on Windows easier, so I have included it in the distribution.
1219    31. There is now a check in pcretest against a ridiculously large number being
1220        returned by pcre_exec() or pcre_dfa_exec(). If this happens in a /g or /G
1221        loop, the loop is abandoned.
1223    32. Forward references to subpatterns in conditions such as (?(2)...) where
1224        subpattern 2 is defined later cause pcre_compile() to search forwards in
1225        the pattern for the relevant set of parentheses. This search went wrong
1226        when there were unescaped parentheses in a character class, parentheses
1227        escaped with \Q...\E, or parentheses in a #-comment in /x mode.
1229    33. "Subroutine" calls and backreferences were previously restricted to
1230        referencing subpatterns earlier in the regex. This restriction has now
1231        been removed.
1233    34. Added a number of extra features that are going to be in Perl 5.10. On the
1234        whole, these are just syntactic alternatives for features that PCRE had
1235        previously implemented using the Python syntax or my own invention. The
1236        other formats are all retained for compatibility.
1238        (a) Named groups can now be defined as (?<name>...) or (?'name'...) as well
1239            as (?P<name>...). The new forms, as well as being in Perl 5.10, are
1240            also .NET compatible.
1242        (b) A recursion or subroutine call to a named group can now be defined as
1243            (?&name) as well as (?P>name).
1245        (c) A backreference to a named group can now be defined as \k<name> or
1246            \k'name' as well as (?P=name). The new forms, as well as being in Perl
1247            5.10, are also .NET compatible.
1249        (d) A conditional reference to a named group can now use the syntax
1250            (?(<name>) or (?('name') as well as (?(name).
1252        (e) A "conditional group" of the form (?(DEFINE)...) can be used to define
1253            groups (named and numbered) that are never evaluated inline, but can be
1254            called as "subroutines" from elsewhere. In effect, the DEFINE condition
1255            is always false. There may be only one alternative in such a group.
1257        (f) A test for recursion can be given as (?(R1).. or (?(R&name)... as well
1258            as the simple (?(R). The condition is true only if the most recent
1259            recursion is that of the given number or name. It does not search out
1260            through the entire recursion stack.
1262        (g) The escape \gN or \g{N} has been added, where N is a positive or
1263            negative number, specifying an absolute or relative reference.
1265    35. Tidied to get rid of some further signed/unsigned compiler warnings and
1266        some "unreachable code" warnings.
1268    36. Updated the Unicode property tables to Unicode version 5.0.0. Amongst other
1269        things, this adds five new scripts.
1271    37. Perl ignores orphaned \E escapes completely. PCRE now does the same.
1272        There were also incompatibilities regarding the handling of \Q..\E inside
1273        character classes, for example with patterns like [\Qa\E-\Qz\E] where the
1274        hyphen was adjacent to \Q or \E. I hope I've cleared all this up now.
1276    38. Like Perl, PCRE detects when an indefinitely repeated parenthesized group
1277        matches an empty string, and forcibly breaks the loop. There were bugs in
1278        this code in non-simple cases. For a pattern such as  ^(a()*)*  matched
1279        against  aaaa  the result was just "a" rather than "aaaa", for example. Two
1280        separate and independent bugs (that affected different cases) have been
1281        fixed.
1283    39. Refactored the code to abolish the use of different opcodes for small
1284        capturing bracket numbers. This is a tidy that I avoided doing when I
1285        removed the limit on the number of capturing brackets for 3.5 back in 2001.
1286        The new approach is not only tidier, it makes it possible to reduce the
1287        memory needed to fix the previous bug (38).
1289    40. Implemented PCRE_NEWLINE_ANY to recognize any of the Unicode newline
1290        sequences (http://unicode.org/unicode/reports/tr18/) as "newline" when
1291        processing dot, circumflex, or dollar metacharacters, or #-comments in /x
1292        mode.
1294    41. Add \R to match any Unicode newline sequence, as suggested in the Unicode
1295        report.
1297    42. Applied patch, originally from Ari Pollak, modified by Google, to allow
1298        copy construction and assignment in the C++ wrapper.
1300    43. Updated pcregrep to support "--newline=any". In the process, I fixed a
1301        couple of bugs that could have given wrong results in the "--newline=crlf"
1302        case.
1304    44. Added a number of casts and did some reorganization of signed/unsigned int
1305        variables following suggestions from Dair Grant. Also renamed the variable
1306        "this" as "item" because it is a C++ keyword.
1308    45. Arranged for dftables to add
1310          #include "pcre_internal.h"
1312        to pcre_chartables.c because without it, gcc 4.x may remove the array
1313        definition from the final binary if PCRE is built into a static library and
1314        dead code stripping is activated.
1316    46. For an unanchored pattern, if a match attempt fails at the start of a
1317        newline sequence, and the newline setting is CRLF or ANY, and the next two
1318        characters are CRLF, advance by two characters instead of one.
1321    Version 6.7 04-Jul-06
1322    ---------------------
1324     1. In order to handle tests when input lines are enormously long, pcretest has
1325        been re-factored so that it automatically extends its buffers when
1326        necessary. The code is crude, but this _is_ just a test program. The
1327        default size has been increased from 32K to 50K.
1329     2. The code in pcre_study() was using the value of the re argument before
1330        testing it for NULL. (Of course, in any sensible call of the function, it
1331        won't be NULL.)
1333     3. The memmove() emulation function in pcre_internal.h, which is used on
1334        systems that lack both memmove() and bcopy() - that is, hardly ever -
1335        was missing a "static" storage class specifier.
1337     4. When UTF-8 mode was not set, PCRE looped when compiling certain patterns
1338        containing an extended class (one that cannot be represented by a bitmap
1339        because it contains high-valued characters or Unicode property items, e.g.
1340        [\pZ]). Almost always one would set UTF-8 mode when processing such a
1341        pattern, but PCRE should not loop if you do not (it no longer does).
1342        [Detail: two cases were found: (a) a repeated subpattern containing an
1343        extended class; (b) a recursive reference to a subpattern that followed a
1344        previous extended class. It wasn't skipping over the extended class
1345        correctly when UTF-8 mode was not set.]
1347     5. A negated single-character class was not being recognized as fixed-length
1348        in lookbehind assertions such as (?<=[^f]), leading to an incorrect
1349        compile error "lookbehind assertion is not fixed length".
1351     6. The RunPerlTest auxiliary script was showing an unexpected difference
1352        between PCRE and Perl for UTF-8 tests. It turns out that it is hard to
1353        write a Perl script that can interpret lines of an input file either as
1354        byte characters or as UTF-8, which is what "perltest" was being required to
1355        do for the non-UTF-8 and UTF-8 tests, respectively. Essentially what you
1356        can't do is switch easily at run time between having the "use utf8;" pragma
1357        or not. In the end, I fudged it by using the RunPerlTest script to insert
1358        "use utf8;" explicitly for the UTF-8 tests.
1360     7. In multiline (/m) mode, PCRE was matching ^ after a terminating newline at
1361        the end of the subject string, contrary to the documentation and to what
1362        Perl does. This was true of both matching functions. Now it matches only at
1363        the start of the subject and immediately after *internal* newlines.
1365     8. A call of pcre_fullinfo() from pcretest to get the option bits was passing
1366        a pointer to an int instead of a pointer to an unsigned long int. This
1367        caused problems on 64-bit systems.
1369     9. Applied a patch from the folks at Google to pcrecpp.cc, to fix "another
1370        instance of the 'standard' template library not being so standard".
1372    10. There was no check on the number of named subpatterns nor the maximum
1373        length of a subpattern name. The product of these values is used to compute
1374        the size of the memory block for a compiled pattern. By supplying a very
1375        long subpattern name and a large number of named subpatterns, the size
1376        computation could be caused to overflow. This is now prevented by limiting
1377        the length of names to 32 characters, and the number of named subpatterns
1378        to 10,000.
1380    11. Subpatterns that are repeated with specific counts have to be replicated in
1381        the compiled pattern. The size of memory for this was computed from the
1382        length of the subpattern and the repeat count. The latter is limited to
1383        65535, but there was no limit on the former, meaning that integer overflow
1384        could in principle occur. The compiled length of a repeated subpattern is
1385        now limited to 30,000 bytes in order to prevent this.
1387    12. Added the optional facility to have named substrings with the same name.
1389    13. Added the ability to use a named substring as a condition, using the
1390        Python syntax: (?(name)yes|no). This overloads (?(R)... and names that
1391        are numbers (not recommended). Forward references are permitted.
1393    14. Added forward references in named backreferences (if you see what I mean).
1395    15. In UTF-8 mode, with the PCRE_DOTALL option set, a quantified dot in the
1396        pattern could run off the end of the subject. For example, the pattern
1397        "(?s)(.{1,5})"8 did this with the subject "ab".
1399    16. If PCRE_DOTALL or PCRE_MULTILINE were set, pcre_dfa_exec() behaved as if
1400        PCRE_CASELESS was set when matching characters that were quantified with ?
1401        or *.
1403    17. A character class other than a single negated character that had a minimum
1404        but no maximum quantifier - for example [ab]{6,} - was not handled
1405        correctly by pce_dfa_exec(). It would match only one character.
1407    18. A valid (though odd) pattern that looked like a POSIX character
1408        class but used an invalid character after [ (for example [[,abc,]]) caused
1409        pcre_compile() to give the error "Failed: internal error: code overflow" or
1410        in some cases to crash with a glibc free() error. This could even happen if
1411        the pattern terminated after [[ but there just happened to be a sequence of
1412        letters, a binary zero, and a closing ] in the memory that followed.
1414    19. Perl's treatment of octal escapes in the range \400 to \777 has changed
1415        over the years. Originally (before any Unicode support), just the bottom 8
1416        bits were taken. Thus, for example, \500 really meant \100. Nowadays the
1417        output from "man perlunicode" includes this:
1419          The regular expression compiler produces polymorphic opcodes.  That
1420          is, the pattern adapts to the data and automatically switches to
1421          the Unicode character scheme when presented with Unicode data--or
1422          instead uses a traditional byte scheme when presented with byte
1423          data.
1425        Sadly, a wide octal escape does not cause a switch, and in a string with
1426        no other multibyte characters, these octal escapes are treated as before.
1427        Thus, in Perl, the pattern  /\500/ actually matches \100 but the pattern
1428        /\500|\x{1ff}/ matches \500 or \777 because the whole thing is treated as a
1429        Unicode string.
1431        I have not perpetrated such confusion in PCRE. Up till now, it took just
1432        the bottom 8 bits, as in old Perl. I have now made octal escapes with
1433        values greater than \377 illegal in non-UTF-8 mode. In UTF-8 mode they
1434        translate to the appropriate multibyte character.
1436    29. Applied some refactoring to reduce the number of warnings from Microsoft
1437        and Borland compilers. This has included removing the fudge introduced
1438        seven years ago for the OS/2 compiler (see 2.02/2 below) because it caused
1439        a warning about an unused variable.
1441    21. PCRE has not included VT (character 0x0b) in the set of whitespace
1442        characters since release 4.0, because Perl (from release 5.004) does not.
1443        [Or at least, is documented not to: some releases seem to be in conflict
1444        with the documentation.] However, when a pattern was studied with
1445        pcre_study() and all its branches started with \s, PCRE still included VT
1446        as a possible starting character. Of course, this did no harm; it just
1447        caused an unnecessary match attempt.
1449    22. Removed a now-redundant internal flag bit that recorded the fact that case
1450        dependency changed within the pattern. This was once needed for "required
1451        byte" processing, but is no longer used. This recovers a now-scarce options
1452        bit. Also moved the least significant internal flag bit to the most-
1453        significant bit of the word, which was not previously used (hangover from
1454        the days when it was an int rather than a uint) to free up another bit for
1455        the future.
1457    23. Added support for CRLF line endings as well as CR and LF. As well as the
1458        default being selectable at build time, it can now be changed at runtime
1459        via the PCRE_NEWLINE_xxx flags. There are now options for pcregrep to
1460        specify that it is scanning data with non-default line endings.
1462    24. Changed the definition of CXXLINK to make it agree with the definition of
1463        LINK in the Makefile, by replacing LDFLAGS to CXXFLAGS.
1465    25. Applied Ian Taylor's patches to avoid using another stack frame for tail
1466        recursions. This makes a big different to stack usage for some patterns.
1468    26. If a subpattern containing a named recursion or subroutine reference such
1469        as (?P>B) was quantified, for example (xxx(?P>B)){3}, the calculation of
1470        the space required for the compiled pattern went wrong and gave too small a
1471        value. Depending on the environment, this could lead to "Failed: internal
1472        error: code overflow at offset 49" or "glibc detected double free or
1473        corruption" errors.
1475    27. Applied patches from Google (a) to support the new newline modes and (b) to
1476        advance over multibyte UTF-8 characters in GlobalReplace.
1478    28. Change free() to pcre_free() in pcredemo.c. Apparently this makes a
1479        difference for some implementation of PCRE in some Windows version.
1481    29. Added some extra testing facilities to pcretest:
1483        \q<number>   in a data line sets the "match limit" value
1484        \Q<number>   in a data line sets the "match recursion limt" value
1485        -S <number>  sets the stack size, where <number> is in megabytes
1487        The -S option isn't available for Windows.
1490    Version 6.6 06-Feb-06
1491    ---------------------
1493     1. Change 16(a) for 6.5 broke things, because PCRE_DATA_SCOPE was not defined
1494        in pcreposix.h. I have copied the definition from pcre.h.
1496     2. Change 25 for 6.5 broke compilation in a build directory out-of-tree
1497        because pcre.h is no longer a built file.
1499     3. Added Jeff Friedl's additional debugging patches to pcregrep. These are
1500        not normally included in the compiled code.
1503  Version 6.5 01-Feb-06  Version 6.5 01-Feb-06
1504  ---------------------  ---------------------

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