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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.1 12-Mar-07  Version 8.00 05-Oct-09
5    ----------------------
6    
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8        was out-of-date, and there was no check on the pcre_compile() error code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.
11    
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.
15    
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.
23    
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.
28    
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.
33    
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.
36    
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.
43    
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.
50    
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 offset of the earliest inspected character
55        for the match and the offset of the end of the subject are set in them when
56        PCRE_ERROR_PARTIAL is returned.
57    
58    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
59        synonymous with PCRE_PARTIAL, for backwards compatibility, and
60        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
61        and may be more useful for multi-segment matching, especially with
62        pcre_exec().
63    
64    11. Partial matching with pcre_exec() is now more intuitive. A partial match
65        used to be given if ever the end of the subject was reached; now it is
66        given only if matching could not proceed because another character was
67        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
68        string "Z", which now yields "no match" instead of "partial match". In the
69        case of pcre_dfa_exec(), "no match" is given if every matching path for the
70        final character ended with (*FAIL).
71    
72    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
73        if the pattern had a "must contain" character that was already found in the
74        earlier partial match, unless partial matching was again requested. For
75        example, with the pattern /dog.(body)?/, the "must contain" character is
76        "g". If the first part-match was for the string "dog", restarting with
77        "sbody" failed. This bug has been fixed.
78    
79    13. The string returned by pcre_dfa_exec() after a partial match has been
80        changed so that it starts at the first inspected character rather than the
81        first character of the match. This makes a difference only if the pattern
82        starts with a lookbehind assertion or \b or \B (\K is not supported by
83        pcre_dfa_exec()). It's an incompatible change, but it makes the two
84        matching functions compatible, and I think it's the right thing to do.
85    
86    14. Added a pcredemo man page, created automatically from the pcredemo.c file,
87        so that the demonstration program is easily available in environments where
88        PCRE has not been installed from source.
89    
90    15. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
91        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
92        library.
93    
94    16. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
95        It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
96        is not the first non-POSIX option to be added. Clearly some people find
97        these options useful.
98    
99    17. If a caller to the POSIX matching function regexec() passes a non-zero
100        value for nmatch with a NULL value for pmatch, the value of
101        nmatch is forced to zero.
102    
103    18. RunGrepTest did not have a test for the availability of the -u option of
104        the diff command, as RunTest does. It now checks in the same way as
105        RunTest, and also checks for the -b option.
106    
107    19. If an odd number of negated classes containing just a single character
108        interposed, within parentheses, between a forward reference to a named
109        subpattern and the definition of the subpattern, compilation crashed with
110        an internal error, complaining that it could not find the referenced
111        subpattern. An example of a crashing pattern is /(?&A)(([^m])(?<A>))/.
112        [The bug was that it was starting one character too far in when skipping
113        over the character class, thus treating the ] as data rather than
114        terminating the class. This meant it could skip too much.]
115    
116    20. Added PCRE_NOTEMPTY_ATSTART in order to be able to correctly implement the
117        /g option in pcretest when the pattern contains \K, which makes it possible
118        to have an empty string match not at the start, even when the pattern is
119        anchored. Updated pcretest and pcredemo to use this option.
120    
121    21. If the maximum number of capturing subpatterns in a recursion was greater
122        than the maximum at the outer level, the higher number was returned, but
123        with unset values at the outer level. The correct (outer level) value is
124        now given.
125    
126    22. If (*ACCEPT) appeared inside capturing parentheses, previous releases of
127        PCRE did not set those parentheses (unlike Perl). I have now found a way to
128        make it do so. The string so far is captured, making this feature
129        compatible with Perl.
130    
131    23. The tests have been re-organized, adding tests 11 and 12, to make it
132        possible to check the Perl 5.10 features against Perl 5.10.
133    
134    24. Perl 5.10 allows subroutine calls in lookbehinds, as long as the subroutine
135        pattern matches a fixed length string. PCRE did not allow this; now it
136        does. Neither allows recursion.
137    
138    25. I finally figured out how to implement a request to provide the minimum
139        length of subject string that was needed in order to match a given pattern.
140        (It was back references and recursion that I had previously got hung up
141        on.) This code has now been added to pcre_study(); it finds a lower bound
142        to the length of subject needed. It is not necessarily the greatest lower
143        bound, but using it to avoid searching strings that are too short does give
144        some useful speed-ups. The value is available to calling programs via
145        pcre_fullinfo().
146    
147    26. While implementing 25, I discovered to my embarrassment that pcretest had
148        not been passing the result of pcre_study() to pcre_dfa_exec(), so the
149        study optimizations had never been tested with that matching function.
150        Oops. What is worse, even when it was passed study data, there was a bug in
151        pcre_dfa_exec() that meant it never actually used it. Double oops. There
152        were also very few tests of studied patterns with pcre_dfa_exec().
153    
154    27. If (?| is used to create subpatterns with duplicate numbers, they are now
155        allowed to have the same name, even if PCRE_DUPNAMES is not set. However,
156        on the other side of the coin, they are no longer allowed to have different
157        names, because these cannot be distinguished in PCRE, and this has caused
158        confusion. (This is a difference from Perl.)
159    
160    28. When duplicate subpattern names are present (necessarily with different
161        numbers, as required by 27 above), and a test is made by name in a
162        conditional pattern, either for a subpattern having been matched, or for
163        recursion in such a pattern, all the associated numbered subpatterns are
164        tested, and the overall condition is true if the condition is true for any
165        one of them. This is the way Perl works, and is also more like the way
166        testing by number works.
167    
168    
169    Version 7.9 11-Apr-09
170    ---------------------
171    
172    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
173        (pcretest), all targets were linked against these libraries. This included
174        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
175        libraries. This caused unwanted dependencies to be created. This problem
176        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
177        pcretest is linked with readline.
178    
179    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
180        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
181        moved outside it again, because FALSE and TRUE are already defined in AIX,
182        but BOOL is not.
183    
184    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
185        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
186    
187    4.  The pcregrep documentation said spaces were inserted as well as colons (or
188        hyphens) following file names and line numbers when outputting matching
189        lines. This is not true; no spaces are inserted. I have also clarified the
190        wording for the --colour (or --color) option.
191    
192    5.  In pcregrep, when --colour was used with -o, the list of matching strings
193        was not coloured; this is different to GNU grep, so I have changed it to be
194        the same.
195    
196    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
197        each matching line was coloured. Now it goes on to look for further matches
198        of any of the test patterns, which is the same behaviour as GNU grep.
199    
200    7.  A pattern that could match an empty string could cause pcregrep to loop; it
201        doesn't make sense to accept an empty string match in pcregrep, so I have
202        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
203        seems to be how GNU grep behaves.
204    
205    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
206        start or after a newline", because the conditional assertion was not being
207        correctly handled. The rule now is that both the assertion and what follows
208        in the first alternative must satisfy the test.
209    
210    9.  If auto-callout was enabled in a pattern with a conditional group whose
211        condition was an assertion, PCRE could crash during matching, both with
212        pcre_exec() and pcre_dfa_exec().
213    
214    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
215        used for matching.
216    
217    11. Unicode property support in character classes was not working for
218        characters (bytes) greater than 127 when not in UTF-8 mode.
219    
220    12. Added the -M command line option to pcretest.
221    
222    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
223    
224    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
225    
226    16. Added comments and documentation about mis-use of no_arg in the C++
227        wrapper.
228    
229    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
230        from Martin Jerabek that uses macro names for all relevant character and
231        string constants.
232    
233    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
234        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
235        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
236        these, but not everybody uses configure.
237    
238    19. A conditional group that had only one branch was not being correctly
239        recognized as an item that could match an empty string. This meant that an
240        enclosing group might also not be so recognized, causing infinite looping
241        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
242        with the subject "ab", where knowledge that the repeated group can match
243        nothing is needed in order to break the loop.
244    
245    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
246        exec(), but without supplying a callout function, matching went wrong.
247    
248    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
249        leak if the size of the offset vector was greater than 30. When the vector
250        is smaller, the saved offsets during recursion go onto a local stack
251        vector, but for larger vectors malloc() is used. It was failing to free
252        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
253        error, in fact).
254    
255    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
256        heapframe that is used only when UTF-8 support is enabled. This caused no
257        problem, but was untidy.
258    
259    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
260        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
261        included within another project.
262    
263    24. Steven Van Ingelgem's patches to add more options to the CMake support,
264        slightly modified by me:
265    
266          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
267              not building pcregrep.
268    
269          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
270              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
271    
272    25. Forward references, both numeric and by name, in patterns that made use of
273        duplicate group numbers, could behave incorrectly or give incorrect errors,
274        because when scanning forward to find the reference group, PCRE was not
275        taking into account the duplicate group numbers. A pattern such as
276        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
277    
278    26. Changed a few more instances of "const unsigned char *" to USPTR, making
279        the feature of a custom pointer more persuasive (as requested by a user).
280    
281    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
282        pcretest.c, inside #ifndefs, because it seems they are sometimes already
283        pre-defined.
284    
285    28. Added support for (*UTF8) at the start of a pattern.
286    
287    29. Arrange for flags added by the "release type" setting in CMake to be shown
288        in the configuration summary.
289    
290    
291    Version 7.8 05-Sep-08
292    ---------------------
293    
294    1.  Replaced UCP searching code with optimized version as implemented for Ad
295        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
296        stage table and inline lookup instead of a function, giving speed ups of 2
297        to 5 times on some simple patterns that I tested. Permission was given to
298        distribute the MultiStage2.py script that generates the tables (it's not in
299        the tarball, but is in the Subversion repository).
300    
301    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
302        scripts.
303    
304    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
305        a group with a zero qualifier. The result of the study could be incorrect,
306        or the function might crash, depending on the pattern.
307    
308    4.  Caseless matching was not working for non-ASCII characters in back
309        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
310        It now works when Unicode Property Support is available.
311    
312    5.  In pcretest, an escape such as \x{de} in the data was always generating
313        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
314        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
315        truncation.
316    
317    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
318    
319    7.  Added two (int) casts to pcregrep when printing the difference of two
320        pointers, in case they are 64-bit values.
321    
322    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
323        test 2 if it fails.
324    
325    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
326        and a #define of that name to empty if it is not externally set. This is to
327        allow users of MSVC to set it if necessary.
328    
329    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
330        the convenience functions in the pcre_get.c source file.
331    
332    11. An option change at the start of a pattern that had top-level alternatives
333        could cause overwriting and/or a crash. This command provoked a crash in
334        some environments:
335    
336          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
337    
338        This potential security problem was recorded as CVE-2008-2371.
339    
340    12. For a pattern where the match had to start at the beginning or immediately
341        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
342        pcre_dfa_exec() could read past the end of the passed subject if there was
343        no match. To help with detecting such bugs (e.g. with valgrind), I modified
344        pcretest so that it places the subject at the end of its malloc-ed buffer.
345    
346    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
347        exec() might read past the end of the data buffer in UTF-8 mode.
348    
349    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
350        the data contained the byte 0x85 as part of a UTF-8 character within its
351        first line. This applied both to normal and DFA matching.
352    
353    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
354        /^[^d]*?$/8 failed to match "abc".
355    
356    16. Added a missing copyright notice to pcrecpp_internal.h.
357    
358    17. Make it more clear in the documentation that values returned from
359        pcre_exec() in ovector are byte offsets, not character counts.
360    
361    18. Tidied a few places to stop certain compilers from issuing warnings.
362    
363    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
364        supplied by Stefan Weber. I made a further small update for 7.8 because
365        there is a change of source arrangements: the pcre_searchfuncs.c module is
366        replaced by pcre_ucd.c.
367    
368    
369    Version 7.7 07-May-08
370    ---------------------
371    
372    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
373        a string to a long long, pretend we don't even have a long long." This is
374        done by checking for the strtoq, strtoll, and _strtoi64 functions.
375    
376    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
377        pre-7.6 versions, which defined a global no_arg variable instead of putting
378        it in the RE class. (See also #8 below.)
379    
380    3.  Remove a line of dead code, identified by coverity and reported by Nuno
381        Lopes.
382    
383    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
384    
385        (1) The include/exclude patterns were being applied to the whole pathnames
386            of files, instead of just to the final components.
387    
388        (2) If there was more than one level of directory, the subdirectories were
389            skipped unless they satisfied the include/exclude conditions. This is
390            inconsistent with GNU grep (and could even be seen as contrary to the
391            pcregrep specification - which I improved to make it absolutely clear).
392            The action now is always to scan all levels of directory, and just
393            apply the include/exclude patterns to regular files.
394    
395    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
396        --exclude_dir in the tests to avoid scanning .svn directories.
397    
398    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
399        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
400        doesn't support NULs in patterns.
401    
402    7.  Added some missing "const"s to declarations of static tables in
403        pcre_compile.c and pcre_dfa_exec.c.
404    
405    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
406        caused by fix #2  above. (Subsequently also a second patch to fix the
407        first patch. And a third patch - this was a messy problem.)
408    
409    9.  Applied Craig's patch to remove the use of push_back().
410    
411    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
412        matching function regexec().
413    
414    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
415        which, however, unlike Perl's \g{...}, are subroutine calls, not back
416        references. PCRE supports relative numbers with this syntax (I don't think
417        Oniguruma does).
418    
419    12. Previously, a group with a zero repeat such as (...){0} was completely
420        omitted from the compiled regex. However, this means that if the group
421        was called as a subroutine from elsewhere in the pattern, things went wrong
422        (an internal error was given). Such groups are now left in the compiled
423        pattern, with a new opcode that causes them to be skipped at execution
424        time.
425    
426    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
427        to the way PCRE behaves:
428    
429        (a) A lone ] character is dis-allowed (Perl treats it as data).
430    
431        (b) A back reference to an unmatched subpattern matches an empty string
432            (Perl fails the current match path).
433    
434        (c) A data ] in a character class must be notated as \] because if the
435            first data character in a class is ], it defines an empty class. (In
436            Perl it is not possible to have an empty class.) The empty class []
437            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
438            The negative empty class [^] matches any one character, independently
439            of the DOTALL setting.
440    
441    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
442        non-existent subpattern following a character class starting with ']' and
443        containing () gave an internal compiling error instead of "reference to
444        non-existent subpattern". Fortunately, when the pattern did exist, the
445        compiled code was correct. (When scanning forwards to check for the
446        existencd of the subpattern, it was treating the data ']' as terminating
447        the class, so got the count wrong. When actually compiling, the reference
448        was subsequently set up correctly.)
449    
450    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
451        it was being rejected as not supported by pcre_dfa_exec(), even though
452        other assertions are supported. I have made pcre_dfa_exec() support
453        (*FAIL).
454    
455    16. The implementation of 13c above involved the invention of a new opcode,
456        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
457        cannot be changed at match time, I realized I could make a small
458        improvement to matching performance by compiling OP_ALLANY instead of
459        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
460        on the OP_ANY path.
461    
462    17. Compiling pcretest on Windows with readline support failed without the
463        following two fixes: (1) Make the unistd.h include conditional on
464        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
465    
466    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
467        ncurses library to be included for pcretest when ReadLine support is
468        requested, but also to allow for it to be overridden. This patch came from
469        Daniel Bergström.
470    
471    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
472        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
473        any errors with the current Unicode tables. Thanks to Peter Kankowski for
474        spotting this.
475    
476    
477    Version 7.6 28-Jan-08
478    ---------------------
479    
480    1.  A character class containing a very large number of characters with
481        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
482        overflow.
483    
484    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
485        HAVE_LONG_LONG is not defined.
486    
487    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
488        bring them up to date and include new features. This patch includes:
489    
490        - Fixed PH's badly added libz and libbz2 support.
491        - Fixed a problem with static linking.
492        - Added pcredemo. [But later removed - see 7 below.]
493        - Fixed dftables problem and added an option.
494        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
495            HAVE_LONG_LONG.
496        - Added readline support for pcretest.
497        - Added an listing of the option settings after cmake has run.
498    
499    4.  A user submitted a patch to Makefile that makes it easy to create
500        "pcre.dll" under mingw when using Configure/Make. I added stuff to
501        Makefile.am that cause it to include this special target, without
502        affecting anything else. Note that the same mingw target plus all
503        the other distribution libraries and programs are now supported
504        when configuring with CMake (see 6 below) instead of with
505        Configure/Make.
506    
507    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
508        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
509        exported in the Windows port". It has not yet been confirmed that the patch
510        solves the problem, but it does no harm.
511    
512    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
513        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
514        with CMake, and also correct the comment about stack recursion.
515    
516    7.  Remove the automatic building of pcredemo from the ./configure system and
517        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
518        of a program that users should build themselves after PCRE is installed, so
519        building it automatically is not really right. What is more, it gave
520        trouble in some build environments.
521    
522    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
523    
524    
525    Version 7.5 10-Jan-08
526    ---------------------
527    
528    1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
529        values in parens when parsing an RE using the C++ wrapper."
530    
531    2.  Negative specials like \S did not work in character classes in UTF-8 mode.
532        Characters greater than 255 were excluded from the class instead of being
533        included.
534    
535    3.  The same bug as (2) above applied to negated POSIX classes such as
536        [:^space:].
537    
538    4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
539        defined or documented. It seems to have been a typo for PCRE_STATIC, so
540        I have changed it.
541    
542    5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
543        first named subpattern) and a construct such as (?&a) would reference the
544        first named subpattern whose name started with "a" (in other words, the
545        length check was missing). Both these problems are fixed. "Subpattern name
546        expected" is now given for (?&) (a zero-length name), and this patch also
547        makes it give the same error for \k'' (previously it complained that that
548        was a reference to a non-existent subpattern).
549    
550    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
551        this is right because (?- can be followed by option settings as well as by
552        digits. I have, however, made the messages clearer.
553    
554    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
555        than the number used in the conditional) now cause a compile-time error.
556        This is actually not compatible with Perl, which accepts such patterns, but
557        treats the conditional as always being FALSE (as PCRE used to), but it
558        seems to me that giving a diagnostic is better.
559    
560    8.  Change "alphameric" to the more common word "alphanumeric" in comments
561        and messages.
562    
563    9.  Fix two occurrences of "backslash" in comments that should have been
564        "backspace".
565    
566    10. Remove two redundant lines of code that can never be obeyed (their function
567        was moved elsewhere).
568    
569    11. The program that makes PCRE's Unicode character property table had a bug
570        which caused it to generate incorrect table entries for sequences of
571        characters that have the same character type, but are in different scripts.
572        It amalgamated them into a single range, with the script of the first of
573        them. In other words, some characters were in the wrong script. There were
574        thirteen such cases, affecting characters in the following ranges:
575    
576          U+002b0 - U+002c1
577          U+0060c - U+0060d
578          U+0061e - U+00612
579          U+0064b - U+0065e
580          U+0074d - U+0076d
581          U+01800 - U+01805
582          U+01d00 - U+01d77
583          U+01d9b - U+01dbf
584          U+0200b - U+0200f
585          U+030fc - U+030fe
586          U+03260 - U+0327f
587          U+0fb46 - U+0fbb1
588          U+10450 - U+1049d
589    
590    12. The -o option (show only the matching part of a line) for pcregrep was not
591        compatible with GNU grep in that, if there was more than one match in a
592        line, it showed only the first of them. It now behaves in the same way as
593        GNU grep.
594    
595    13. If the -o and -v options were combined for pcregrep, it printed a blank
596        line for every non-matching line. GNU grep prints nothing, and pcregrep now
597        does the same. The return code can be used to tell if there were any
598        non-matching lines.
599    
600    14. Added --file-offsets and --line-offsets to pcregrep.
601    
602    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
603        infinitely looping recursion. The bug was that positive lookaheads were not
604        being skipped when checking for a possible empty match (negative lookaheads
605        and both kinds of lookbehind were skipped).
606    
607    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
608        inclusion of <windows.h> to before rather than after the definition of
609        INVALID_FILE_ATTRIBUTES (patch from David Byron).
610    
611    17. Specifying a possessive quantifier with a specific limit for a Unicode
612        character property caused pcre_compile() to compile bad code, which led at
613        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
614        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
615        caused the error; without that there was no problem.
616    
617    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
618    
619    19. Added --enable-pcretest-libreadline.
620    
621    20. In pcrecpp.cc, the variable 'count' was incremented twice in
622        RE::GlobalReplace(). As a result, the number of replacements returned was
623        double what it should be. I removed one of the increments, but Craig sent a
624        later patch that removed the other one (the right fix) and added unit tests
625        that check the return values (which was not done before).
626    
627    21. Several CMake things:
628    
629        (1) Arranged that, when cmake is used on Unix, the libraries end up with
630            the names libpcre and libpcreposix, not just pcre and pcreposix.
631    
632        (2) The above change means that pcretest and pcregrep are now correctly
633            linked with the newly-built libraries, not previously installed ones.
634    
635        (3) Added PCRE_SUPPORT_LIBREADLINE, PCRE_SUPPORT_LIBZ, PCRE_SUPPORT_LIBBZ2.
636    
637    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
638        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
639        UTF-8 newline character). The key issue is that the pattern starts .*;
640        this means that the match must be either at the beginning, or after a
641        newline. The bug was in the code for advancing after a failed match and
642        checking that the new position followed a newline. It was not taking
643        account of UTF-8 characters correctly.
644    
645    23. PCRE was behaving differently from Perl in the way it recognized POSIX
646        character classes. PCRE was not treating the sequence [:...:] as a
647        character class unless the ... were all letters. Perl, however, seems to
648        allow any characters between [: and :], though of course it rejects as
649        unknown any "names" that contain non-letters, because all the known class
650        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
651        for example, whereas PCRE did not - it did not recognize a POSIX character
652        class. This seemed a bit dangerous, so the code has been changed to be
653        closer to Perl. The behaviour is not identical to Perl, because PCRE will
654        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
655        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
656        Perl does, and where it didn't before.
657    
658    24. Rewrite so as to remove the single use of %n from pcregrep because in some
659        Windows environments %n is disabled by default.
660    
661    
662    Version 7.4 21-Sep-07
663    ---------------------
664    
665    1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This
666        means that a class such as [\s] counted as "explicit reference to CR or
667        LF". That isn't really right - the whole point of the change was to try to
668        help when there was an actual mention of one of the two characters. So now
669        the change happens only if \r or \n (or a literal CR or LF) character is
670        encountered.
671    
672    2.  The 32-bit options word was also used for 6 internal flags, but the numbers
673        of both had grown to the point where there were only 3 bits left.
674        Fortunately, there was spare space in the data structure, and so I have
675        moved the internal flags into a new 16-bit field to free up more option
676        bits.
677    
678    3.  The appearance of (?J) at the start of a pattern set the DUPNAMES option,
679        but did not set the internal JCHANGED flag - either of these is enough to
680        control the way the "get" function works - but the PCRE_INFO_JCHANGED
681        facility is supposed to tell if (?J) was ever used, so now (?J) at the
682        start sets both bits.
683    
684    4.  Added options (at build time, compile time, exec time) to change \R from
685        matching any Unicode line ending sequence to just matching CR, LF, or CRLF.
686    
687    5.  doc/pcresyntax.html was missing from the distribution.
688    
689    6.  Put back the definition of PCRE_ERROR_NULLWSLIMIT, for backward
690        compatibility, even though it is no longer used.
691    
692    7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and
693        strtoull to pcrecpp.cc to select the available functions in WIN32 when the
694        windows.h file is present (where different names are used). [This was
695        reversed later after testing - see 16 below.]
696    
697    8.  Changed all #include <config.h> to #include "config.h". There were also
698        some further <pcre.h> cases that I changed to "pcre.h".
699    
700    9.  When pcregrep was used with the --colour option, it missed the line ending
701        sequence off the lines that it output.
702    
703    10. It was pointed out to me that arrays of string pointers cause lots of
704        relocations when a shared library is dynamically loaded. A technique of
705        using a single long string with a table of offsets can drastically reduce
706        these. I have refactored PCRE in four places to do this. The result is
707        dramatic:
708    
709          Originally:                          290
710          After changing UCP table:            187
711          After changing error message table:   43
712          After changing table of "verbs"       36
713          After changing table of Posix names   22
714    
715        Thanks to the folks working on Gregex for glib for this insight.
716    
717    11. --disable-stack-for-recursion caused compiling to fail unless -enable-
718        unicode-properties was also set.
719    
720    12. Updated the tests so that they work when \R is defaulted to ANYCRLF.
721    
722    13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously
723        checked only for CRLF.
724    
725    14. Added casts to pcretest.c to avoid compiler warnings.
726    
727    15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
728    
729    16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
730        and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
731        entirely. This removes changes made in 7 above.
732    
733    17. The CMake files have been updated, and there is now more information about
734        building with CMake in the NON-UNIX-USE document.
735    
736    
737    Version 7.3 28-Aug-07
738    ---------------------
739    
740     1. In the rejigging of the build system that eventually resulted in 7.1, the
741        line "#include <pcre.h>" was included in pcre_internal.h. The use of angle
742        brackets there is not right, since it causes compilers to look for an
743        installed pcre.h, not the version that is in the source that is being
744        compiled (which of course may be different). I have changed it back to:
745    
746          #include "pcre.h"
747    
748        I have a vague recollection that the change was concerned with compiling in
749        different directories, but in the new build system, that is taken care of
750        by the VPATH setting the Makefile.
751    
752     2. The pattern .*$ when run in not-DOTALL UTF-8 mode with newline=any failed
753        when the subject happened to end in the byte 0x85 (e.g. if the last
754        character was \x{1ec5}). *Character* 0x85 is one of the "any" newline
755        characters but of course it shouldn't be taken as a newline when it is part
756        of another character. The bug was that, for an unlimited repeat of . in
757        not-DOTALL UTF-8 mode, PCRE was advancing by bytes rather than by
758        characters when looking for a newline.
759    
760     3. A small performance improvement in the DOTALL UTF-8 mode .* case.
761    
762     4. Debugging: adjusted the names of opcodes for different kinds of parentheses
763        in debug output.
764    
765     5. Arrange to use "%I64d" instead of "%lld" and "%I64u" instead of "%llu" for
766        long printing in the pcrecpp unittest when running under MinGW.
767    
768     6. ESC_K was left out of the EBCDIC table.
769    
770     7. Change 7.0/38 introduced a new limit on the number of nested non-capturing
771        parentheses; I made it 1000, which seemed large enough. Unfortunately, the
772        limit also applies to "virtual nesting" when a pattern is recursive, and in
773        this case 1000 isn't so big. I have been able to remove this limit at the
774        expense of backing off one optimization in certain circumstances. Normally,
775        when pcre_exec() would call its internal match() function recursively and
776        immediately return the result unconditionally, it uses a "tail recursion"
777        feature to save stack. However, when a subpattern that can match an empty
778        string has an unlimited repetition quantifier, it no longer makes this
779        optimization. That gives it a stack frame in which to save the data for
780        checking that an empty string has been matched. Previously this was taken
781        from the 1000-entry workspace that had been reserved. So now there is no
782        explicit limit, but more stack is used.
783    
784     8. Applied Daniel's patches to solve problems with the import/export magic
785        syntax that is required for Windows, and which was going wrong for the
786        pcreposix and pcrecpp parts of the library. These were overlooked when this
787        problem was solved for the main library.
788    
789     9. There were some crude static tests to avoid integer overflow when computing
790        the size of patterns that contain repeated groups with explicit upper
791        limits. As the maximum quantifier is 65535, the maximum group length was
792        set at 30,000 so that the product of these two numbers did not overflow a
793        32-bit integer. However, it turns out that people want to use groups that
794        are longer than 30,000 bytes (though not repeat them that many times).
795        Change 7.0/17 (the refactoring of the way the pattern size is computed) has
796        made it possible to implement the integer overflow checks in a much more
797        dynamic way, which I have now done. The artificial limitation on group
798        length has been removed - we now have only the limit on the total length of
799        the compiled pattern, which depends on the LINK_SIZE setting.
800    
801    10. Fixed a bug in the documentation for get/copy named substring when
802        duplicate names are permitted. If none of the named substrings are set, the
803        functions return PCRE_ERROR_NOSUBSTRING (7); the doc said they returned an
804        empty string.
805    
806    11. Because Perl interprets \Q...\E at a high level, and ignores orphan \E
807        instances, patterns such as [\Q\E] or [\E] or even [^\E] cause an error,
808        because the ] is interpreted as the first data character and the
809        terminating ] is not found. PCRE has been made compatible with Perl in this
810        regard. Previously, it interpreted [\Q\E] as an empty class, and [\E] could
811        cause memory overwriting.
812    
813    10. Like Perl, PCRE automatically breaks an unlimited repeat after an empty
814        string has been matched (to stop an infinite loop). It was not recognizing
815        a conditional subpattern that could match an empty string if that
816        subpattern was within another subpattern. For example, it looped when
817        trying to match  (((?(1)X|))*)  but it was OK with  ((?(1)X|)*)  where the
818        condition was not nested. This bug has been fixed.
819    
820    12. A pattern like \X?\d or \P{L}?\d in non-UTF-8 mode could cause a backtrack
821        past the start of the subject in the presence of bytes with the top bit
822        set, for example "\x8aBCD".
823    
824    13. Added Perl 5.10 experimental backtracking controls (*FAIL), (*F), (*PRUNE),
825        (*SKIP), (*THEN), (*COMMIT), and (*ACCEPT).
826    
827    14. Optimized (?!) to (*FAIL).
828    
829    15. Updated the test for a valid UTF-8 string to conform to the later RFC 3629.
830        This restricts code points to be within the range 0 to 0x10FFFF, excluding
831        the "low surrogate" sequence 0xD800 to 0xDFFF. Previously, PCRE allowed the
832        full range 0 to 0x7FFFFFFF, as defined by RFC 2279. Internally, it still
833        does: it's just the validity check that is more restrictive.
834    
835    16. Inserted checks for integer overflows during escape sequence (backslash)
836        processing, and also fixed erroneous offset values for syntax errors during
837        backslash processing.
838    
839    17. Fixed another case of looking too far back in non-UTF-8 mode (cf 12 above)
840        for patterns like [\PPP\x8a]{1,}\x80 with the subject "A\x80".
841    
842    18. An unterminated class in a pattern like (?1)\c[ with a "forward reference"
843        caused an overrun.
844    
845    19. A pattern like (?:[\PPa*]*){8,} which had an "extended class" (one with
846        something other than just ASCII characters) inside a group that had an
847        unlimited repeat caused a loop at compile time (while checking to see
848        whether the group could match an empty string).
849    
850    20. Debugging a pattern containing \p or \P could cause a crash. For example,
851        [\P{Any}] did so. (Error in the code for printing property names.)
852    
853    21. An orphan \E inside a character class could cause a crash.
854    
855    22. A repeated capturing bracket such as (A)? could cause a wild memory
856        reference during compilation.
857    
858    23. There are several functions in pcre_compile() that scan along a compiled
859        expression for various reasons (e.g. to see if it's fixed length for look
860        behind). There were bugs in these functions when a repeated \p or \P was
861        present in the pattern. These operators have additional parameters compared
862        with \d, etc, and these were not being taken into account when moving along
863        the compiled data. Specifically:
864    
865        (a) A item such as \p{Yi}{3} in a lookbehind was not treated as fixed
866            length.
867    
868        (b) An item such as \pL+ within a repeated group could cause crashes or
869            loops.
870    
871        (c) A pattern such as \p{Yi}+(\P{Yi}+)(?1) could give an incorrect
872            "reference to non-existent subpattern" error.
873    
874        (d) A pattern like (\P{Yi}{2}\277)? could loop at compile time.
875    
876    24. A repeated \S or \W in UTF-8 mode could give wrong answers when multibyte
877        characters were involved (for example /\S{2}/8g with "A\x{a3}BC").
878    
879    25. Using pcregrep in multiline, inverted mode (-Mv) caused it to loop.
880    
881    26. Patterns such as [\P{Yi}A] which include \p or \P and just one other
882        character were causing crashes (broken optimization).
883    
884    27. Patterns such as (\P{Yi}*\277)* (group with possible zero repeat containing
885        \p or \P) caused a compile-time loop.
886    
887    28. More problems have arisen in unanchored patterns when CRLF is a valid line
888        break. For example, the unstudied pattern [\r\n]A does not match the string
889        "\r\nA" because change 7.0/46 below moves the current point on by two
890        characters after failing to match at the start. However, the pattern \nA
891        *does* match, because it doesn't start till \n, and if [\r\n]A is studied,
892        the same is true. There doesn't seem any very clean way out of this, but
893        what I have chosen to do makes the common cases work: PCRE now takes note
894        of whether there can be an explicit match for \r or \n anywhere in the
895        pattern, and if so, 7.0/46 no longer applies. As part of this change,
896        there's a new PCRE_INFO_HASCRORLF option for finding out whether a compiled
897        pattern has explicit CR or LF references.
898    
899    29. Added (*CR) etc for changing newline setting at start of pattern.
900    
901    
902    Version 7.2 19-Jun-07
903    ---------------------
904    
905     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
906        which is apparently normally available under Windows.
907    
908     2. Re-jig the pcregrep tests with different newline settings in an attempt
909        to make them independent of the local environment's newline setting.
910    
911     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
912    
913     4. Some of the "internals" tests were previously cut out when the link size
914        was not 2, because the output contained actual offsets. The recent new
915        "Z" feature of pcretest means that these can be cut out, making the tests
916        usable with all link sizes.
917    
918     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
919        stack recursion. This gives a massive performance boost under BSD, but just
920        a small improvement under Linux. However, it saves one field in the frame
921        in all cases.
922    
923     6. Added more features from the forthcoming Perl 5.10:
924    
925        (a) (?-n) (where n is a string of digits) is a relative subroutine or
926            recursion call. It refers to the nth most recently opened parentheses.
927    
928        (b) (?+n) is also a relative subroutine call; it refers to the nth next
929            to be opened parentheses.
930    
931        (c) Conditions that refer to capturing parentheses can be specified
932            relatively, for example, (?(-2)... or (?(+3)...
933    
934        (d) \K resets the start of the current match so that everything before
935            is not part of it.
936    
937        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
938    
939        (f) \g{name} is another synonym - part of Perl 5.10's unification of
940            reference syntax.
941    
942        (g) (?| introduces a group in which the numbering of parentheses in each
943            alternative starts with the same number.
944    
945        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
946    
947     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
948        PCRE_INFO_JCHANGED.
949    
950     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
951        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
952        for detecting groups that can match an empty string.
953    
954     9. A pattern with a very large number of alternatives (more than several
955        hundred) was running out of internal workspace during the pre-compile
956        phase, where pcre_compile() figures out how much memory will be needed. A
957        bit of new cunning has reduced the workspace needed for groups with
958        alternatives. The 1000-alternative test pattern now uses 12 bytes of
959        workspace instead of running out of the 4096 that are available.
960    
961    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
962    
963    11. Applied patch from Google to remove an optimization that didn't quite work.
964        The report of the bug said:
965    
966          pcrecpp::RE("a*").FullMatch("aaa") matches, while
967          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
968          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
969    
970    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
971        it matched the wrong number of bytes.
972    
973    
974    Version 7.1 24-Apr-07
975  ---------------------  ---------------------
976    
977   1. Applied Bob Rossi and Daniel G's patches to convert the build system to one   1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
# Line 135  Version 7.1 12-Mar-07 Line 1105  Version 7.1 12-Mar-07
1105      was because its rules for how to advance for /g after matching an empty      was because its rules for how to advance for /g after matching an empty
1106      string at the end of a line did not allow for this case. They now check for      string at the end of a line did not allow for this case. They now check for
1107      it specially.      it specially.
1108    
1109  20. pcretest is supposed to handle patterns and data of any length, by  20. pcretest is supposed to handle patterns and data of any length, by
1110      extending its buffers when necessary. It was getting this wrong when the      extending its buffers when necessary. It was getting this wrong when the
1111      buffer for a data line had to be extended.      buffer for a data line had to be extended.
1112    
1113    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
1114        CRLF as a newline sequence.
1115    
1116    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
1117        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
1118        I have nevertheless tidied it up.
1119    
1120    23. Added some casts to kill warnings from HP-UX ia64 compiler.
1121    
1122    24. Added a man page for pcre-config.
1123    
1124    
1125  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06
1126  ---------------------  ---------------------

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