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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.1 05-Mar-07  Version 8.02 01-Mar-2010
5    ------------------------
6    
7    1.  The Unicode data tables have been updated to Unicode 5.2.0.
8    
9    2.  Added the option --libs-cpp to pcre-config, but only when C++ support is
10        configured.
11    
12    3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the
13        original author of that file, following a query about its status.
14    
15    4.  On systems that do not have stdint.h (e.g. Solaris), check for and include
16        inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.
17    
18    5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
19        quantifier applied to a forward-referencing subroutine call, could compile
20        incorrect code or give the error "internal error: previously-checked
21        referenced subpattern not found".
22    
23    6.  Both MS Visual Studio and Symbian OS have problems with initializing
24        variables to point to external functions. For these systems, therefore,
25        pcre_malloc etc. are now initialized to local functions that call the
26        relevant global functions.
27    
28    
29    Version 8.01 19-Jan-2010
30    ------------------------
31    
32    1.  If a pattern contained a conditional subpattern with only one branch (in
33        particular, this includes all (*DEFINE) patterns), a call to pcre_study()
34        computed the wrong minimum data length (which is of course zero for such
35        subpatterns). This could cause incorrect "no match" results.
36    
37    2.  For patterns such as (?i)a(?-i)b|c where an option setting at the start of
38        the pattern is reset in the first branch, pcre_compile() failed with
39        "internal error: code overflow at offset...". This happened only when
40        the reset was to the original external option setting. (An optimization
41        abstracts leading options settings into an external setting, which was the
42        cause of this.)
43    
44    3.  A pattern such as ^(?!a(*SKIP)b) where a negative assertion contained one
45        of the verbs SKIP, PRUNE, or COMMIT, did not work correctly. When the
46        assertion pattern did not match (meaning that the assertion was true), it
47        was incorrectly treated as false if the SKIP had been reached during the
48        matching. This also applied to assertions used as conditions.
49    
50    4.  If an item that is not supported by pcre_dfa_exec() was encountered in an
51        assertion subpattern, including such a pattern used as a condition,
52        unpredictable results occurred, instead of the error return
53        PCRE_ERROR_DFA_UITEM.
54    
55    5.  The C++ GlobalReplace function was not working like Perl for the special
56        situation when an empty string is matched. It now does the fancy magic
57        stuff that is necessary.
58    
59    6.  In pcre_internal.h, obsolete includes to setjmp.h and stdarg.h have been
60        removed. (These were left over from very, very early versions of PCRE.)
61    
62    7.  Some cosmetic changes to the code to make life easier when compiling it
63        as part of something else:
64    
65        (a) Change DEBUG to PCRE_DEBUG.
66    
67        (b) In pcre_compile(), rename the member of the "branch_chain" structure
68            called "current" as "current_branch", to prevent a collision with the
69            Linux macro when compiled as a kernel module.
70    
71        (c) In pcre_study(), rename the function set_bit() as set_table_bit(), to
72            prevent a collision with the Linux macro when compiled as a kernel
73            module.
74    
75    8.  In pcre_compile() there are some checks for integer overflows that used to
76        cast potentially large values to (double). This has been changed to that
77        when building, a check for int64_t is made, and if it is found, it is used
78        instead, thus avoiding the use of floating point arithmetic. (There is no
79        other use of FP in PCRE.) If int64_t is not found, the fallback is to
80        double.
81    
82    9.  Added two casts to avoid signed/unsigned warnings from VS Studio Express
83        2005 (difference between two addresses compared to an unsigned value).
84    
85    10. Change the standard AC_CHECK_LIB test for libbz2 in configure.ac to a
86        custom one, because of the following reported problem in Windows:
87    
88          - libbz2 uses the Pascal calling convention (WINAPI) for the functions
89              under Win32.
90          - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",
91              therefore missing the function definition.
92          - The compiler thus generates a "C" signature for the test function.
93          - The linker fails to find the "C" function.
94          - PCRE fails to configure if asked to do so against libbz2.
95    
96    11. When running libtoolize from libtool-2.2.6b as part of autogen.sh, these
97        messages were output:
98    
99          Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and
100          rerunning libtoolize, to keep the correct libtool macros in-tree.
101          Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
102    
103        I have done both of these things.
104    
105    12. Although pcre_dfa_exec() does not use nearly as much stack as pcre_exec()
106        most of the time, it *can* run out if it is given a pattern that contains a
107        runaway infinite recursion. I updated the discussion in the pcrestack man
108        page.
109    
110    13. Now that we have gone to the x.xx style of version numbers, the minor
111        version may start with zero. Using 08 or 09 is a bad idea because users
112        might check the value of PCRE_MINOR in their code, and 08 or 09 may be
113        interpreted as invalid octal numbers. I've updated the previous comment in
114        configure.ac, and also added a check that gives an error if 08 or 09 are
115        used.
116    
117    14. Change 8.00/11 was not quite complete: code had been accidentally omitted,
118        causing partial matching to fail when the end of the subject matched \W
119        in a UTF-8 pattern where \W was quantified with a minimum of 3.
120    
121    15. There were some discrepancies between the declarations in pcre_internal.h
122        of _pcre_is_newline(), _pcre_was_newline(), and _pcre_valid_utf8() and
123        their definitions. The declarations used "const uschar *" and the
124        definitions used USPTR. Even though USPTR is normally defined as "const
125        unsigned char *" (and uschar is typedeffed as "unsigned char"), it was
126        reported that: "This difference in casting confuses some C++ compilers, for
127        example, SunCC recognizes above declarations as different functions and
128        generates broken code for hbpcre." I have changed the declarations to use
129        USPTR.
130    
131    16. GNU libtool is named differently on some systems. The autogen.sh script now
132        tries several variants such as glibtoolize (MacOSX) and libtoolize1x
133        (FreeBSD).
134    
135    17. Applied Craig's patch that fixes an HP aCC compile error in pcre 8.00
136        (strtoXX undefined when compiling pcrecpp.cc). The patch contains this
137        comment: "Figure out how to create a longlong from a string: strtoll and
138        equivalent. It's not enough to call AC_CHECK_FUNCS: hpux has a strtoll, for
139        instance, but it only takes 2 args instead of 3!"
140    
141    18. A subtle bug concerned with back references has been fixed by a change of
142        specification, with a corresponding code fix. A pattern such as
143        ^(xa|=?\1a)+$ which contains a back reference inside the group to which it
144        refers, was giving matches when it shouldn't. For example, xa=xaaa would
145        match that pattern. Interestingly, Perl (at least up to 5.11.3) has the
146        same bug. Such groups have to be quantified to be useful, or contained
147        inside another quantified group. (If there's no repetition, the reference
148        can never match.) The problem arises because, having left the group and
149        moved on to the rest of the pattern, a later failure that backtracks into
150        the group uses the captured value from the final iteration of the group
151        rather than the correct earlier one. I have fixed this in PCRE by forcing
152        any group that contains a reference to itself to be an atomic group; that
153        is, there cannot be any backtracking into it once it has completed. This is
154        similar to recursive and subroutine calls.
155    
156    
157    Version 8.00 19-Oct-09
158    ----------------------
159    
160    1.  The table for translating pcre_compile() error codes into POSIX error codes
161        was out-of-date, and there was no check on the pcre_compile() error code
162        being within the table. This could lead to an OK return being given in
163        error.
164    
165    2.  Changed the call to open a subject file in pcregrep from fopen(pathname,
166        "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
167        in a Windows environment.
168    
169    3.  The pcregrep --count option prints the count for each file even when it is
170        zero, as does GNU grep. However, pcregrep was also printing all files when
171        --files-with-matches was added. Now, when both options are given, it prints
172        counts only for those files that have at least one match. (GNU grep just
173        prints the file name in this circumstance, but including the count seems
174        more useful - otherwise, why use --count?) Also ensured that the
175        combination -clh just lists non-zero counts, with no names.
176    
177    4.  The long form of the pcregrep -F option was incorrectly implemented as
178        --fixed_strings instead of --fixed-strings. This is an incompatible change,
179        but it seems right to fix it, and I didn't think it was worth preserving
180        the old behaviour.
181    
182    5.  The command line items --regex=pattern and --regexp=pattern were not
183        recognized by pcregrep, which required --regex pattern or --regexp pattern
184        (with a space rather than an '='). The man page documented the '=' forms,
185        which are compatible with GNU grep; these now work.
186    
187    6.  No libpcreposix.pc file was created for pkg-config; there was just
188        libpcre.pc and libpcrecpp.pc. The omission has been rectified.
189    
190    7.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
191        when UCP support is not needed, by modifying the Python script that
192        generates it from Unicode data files. This should not matter if the module
193        is correctly used as a library, but I received one complaint about 50K of
194        unwanted data. My guess is that the person linked everything into his
195        program rather than using a library. Anyway, it does no harm.
196    
197    8.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
198        was a minimum greater than 1 for a wide character in a possessive
199        repetition. The same bug could also affect patterns like /(\x{ff}{0,2})*/8
200        which had an unlimited repeat of a nested, fixed maximum repeat of a wide
201        character. Chaos in the form of incorrect output or a compiling loop could
202        result.
203    
204    9.  The restrictions on what a pattern can contain when partial matching is
205        requested for pcre_exec() have been removed. All patterns can now be
206        partially matched by this function. In addition, if there are at least two
207        slots in the offset vector, the offset of the earliest inspected character
208        for the match and the offset of the end of the subject are set in them when
209        PCRE_ERROR_PARTIAL is returned.
210    
211    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
212        synonymous with PCRE_PARTIAL, for backwards compatibility, and
213        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
214        and may be more useful for multi-segment matching.
215    
216    11. Partial matching with pcre_exec() is now more intuitive. A partial match
217        used to be given if ever the end of the subject was reached; now it is
218        given only if matching could not proceed because another character was
219        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
220        string "Z", which now yields "no match" instead of "partial match". In the
221        case of pcre_dfa_exec(), "no match" is given if every matching path for the
222        final character ended with (*FAIL).
223    
224    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
225        if the pattern had a "must contain" character that was already found in the
226        earlier partial match, unless partial matching was again requested. For
227        example, with the pattern /dog.(body)?/, the "must contain" character is
228        "g". If the first part-match was for the string "dog", restarting with
229        "sbody" failed. This bug has been fixed.
230    
231    13. The string returned by pcre_dfa_exec() after a partial match has been
232        changed so that it starts at the first inspected character rather than the
233        first character of the match. This makes a difference only if the pattern
234        starts with a lookbehind assertion or \b or \B (\K is not supported by
235        pcre_dfa_exec()). It's an incompatible change, but it makes the two
236        matching functions compatible, and I think it's the right thing to do.
237    
238    14. Added a pcredemo man page, created automatically from the pcredemo.c file,
239        so that the demonstration program is easily available in environments where
240        PCRE has not been installed from source.
241    
242    15. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
243        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
244        library.
245    
246    16. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
247        It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
248        is not the first non-POSIX option to be added. Clearly some people find
249        these options useful.
250    
251    17. If a caller to the POSIX matching function regexec() passes a non-zero
252        value for nmatch with a NULL value for pmatch, the value of
253        nmatch is forced to zero.
254    
255    18. RunGrepTest did not have a test for the availability of the -u option of
256        the diff command, as RunTest does. It now checks in the same way as
257        RunTest, and also checks for the -b option.
258    
259    19. If an odd number of negated classes containing just a single character
260        interposed, within parentheses, between a forward reference to a named
261        subpattern and the definition of the subpattern, compilation crashed with
262        an internal error, complaining that it could not find the referenced
263        subpattern. An example of a crashing pattern is /(?&A)(([^m])(?<A>))/.
264        [The bug was that it was starting one character too far in when skipping
265        over the character class, thus treating the ] as data rather than
266        terminating the class. This meant it could skip too much.]
267    
268    20. Added PCRE_NOTEMPTY_ATSTART in order to be able to correctly implement the
269        /g option in pcretest when the pattern contains \K, which makes it possible
270        to have an empty string match not at the start, even when the pattern is
271        anchored. Updated pcretest and pcredemo to use this option.
272    
273    21. If the maximum number of capturing subpatterns in a recursion was greater
274        than the maximum at the outer level, the higher number was returned, but
275        with unset values at the outer level. The correct (outer level) value is
276        now given.
277    
278    22. If (*ACCEPT) appeared inside capturing parentheses, previous releases of
279        PCRE did not set those parentheses (unlike Perl). I have now found a way to
280        make it do so. The string so far is captured, making this feature
281        compatible with Perl.
282    
283    23. The tests have been re-organized, adding tests 11 and 12, to make it
284        possible to check the Perl 5.10 features against Perl 5.10.
285    
286    24. Perl 5.10 allows subroutine calls in lookbehinds, as long as the subroutine
287        pattern matches a fixed length string. PCRE did not allow this; now it
288        does. Neither allows recursion.
289    
290    25. I finally figured out how to implement a request to provide the minimum
291        length of subject string that was needed in order to match a given pattern.
292        (It was back references and recursion that I had previously got hung up
293        on.) This code has now been added to pcre_study(); it finds a lower bound
294        to the length of subject needed. It is not necessarily the greatest lower
295        bound, but using it to avoid searching strings that are too short does give
296        some useful speed-ups. The value is available to calling programs via
297        pcre_fullinfo().
298    
299    26. While implementing 25, I discovered to my embarrassment that pcretest had
300        not been passing the result of pcre_study() to pcre_dfa_exec(), so the
301        study optimizations had never been tested with that matching function.
302        Oops. What is worse, even when it was passed study data, there was a bug in
303        pcre_dfa_exec() that meant it never actually used it. Double oops. There
304        were also very few tests of studied patterns with pcre_dfa_exec().
305    
306    27. If (?| is used to create subpatterns with duplicate numbers, they are now
307        allowed to have the same name, even if PCRE_DUPNAMES is not set. However,
308        on the other side of the coin, they are no longer allowed to have different
309        names, because these cannot be distinguished in PCRE, and this has caused
310        confusion. (This is a difference from Perl.)
311    
312    28. When duplicate subpattern names are present (necessarily with different
313        numbers, as required by 27 above), and a test is made by name in a
314        conditional pattern, either for a subpattern having been matched, or for
315        recursion in such a pattern, all the associated numbered subpatterns are
316        tested, and the overall condition is true if the condition is true for any
317        one of them. This is the way Perl works, and is also more like the way
318        testing by number works.
319    
320    
321    Version 7.9 11-Apr-09
322    ---------------------
323    
324    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
325        (pcretest), all targets were linked against these libraries. This included
326        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
327        libraries. This caused unwanted dependencies to be created. This problem
328        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
329        pcretest is linked with readline.
330    
331    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
332        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
333        moved outside it again, because FALSE and TRUE are already defined in AIX,
334        but BOOL is not.
335    
336    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
337        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
338    
339    4.  The pcregrep documentation said spaces were inserted as well as colons (or
340        hyphens) following file names and line numbers when outputting matching
341        lines. This is not true; no spaces are inserted. I have also clarified the
342        wording for the --colour (or --color) option.
343    
344    5.  In pcregrep, when --colour was used with -o, the list of matching strings
345        was not coloured; this is different to GNU grep, so I have changed it to be
346        the same.
347    
348    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
349        each matching line was coloured. Now it goes on to look for further matches
350        of any of the test patterns, which is the same behaviour as GNU grep.
351    
352    7.  A pattern that could match an empty string could cause pcregrep to loop; it
353        doesn't make sense to accept an empty string match in pcregrep, so I have
354        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
355        seems to be how GNU grep behaves.
356    
357    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
358        start or after a newline", because the conditional assertion was not being
359        correctly handled. The rule now is that both the assertion and what follows
360        in the first alternative must satisfy the test.
361    
362    9.  If auto-callout was enabled in a pattern with a conditional group whose
363        condition was an assertion, PCRE could crash during matching, both with
364        pcre_exec() and pcre_dfa_exec().
365    
366    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
367        used for matching.
368    
369    11. Unicode property support in character classes was not working for
370        characters (bytes) greater than 127 when not in UTF-8 mode.
371    
372    12. Added the -M command line option to pcretest.
373    
374    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
375    
376    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
377    
378    16. Added comments and documentation about mis-use of no_arg in the C++
379        wrapper.
380    
381    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
382        from Martin Jerabek that uses macro names for all relevant character and
383        string constants.
384    
385    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
386        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
387        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
388        these, but not everybody uses configure.
389    
390    19. A conditional group that had only one branch was not being correctly
391        recognized as an item that could match an empty string. This meant that an
392        enclosing group might also not be so recognized, causing infinite looping
393        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
394        with the subject "ab", where knowledge that the repeated group can match
395        nothing is needed in order to break the loop.
396    
397    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
398        exec(), but without supplying a callout function, matching went wrong.
399    
400    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
401        leak if the size of the offset vector was greater than 30. When the vector
402        is smaller, the saved offsets during recursion go onto a local stack
403        vector, but for larger vectors malloc() is used. It was failing to free
404        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
405        error, in fact).
406    
407    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
408        heapframe that is used only when UTF-8 support is enabled. This caused no
409        problem, but was untidy.
410    
411    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
412        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
413        included within another project.
414    
415    24. Steven Van Ingelgem's patches to add more options to the CMake support,
416        slightly modified by me:
417    
418          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
419              not building pcregrep.
420    
421          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
422              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
423    
424    25. Forward references, both numeric and by name, in patterns that made use of
425        duplicate group numbers, could behave incorrectly or give incorrect errors,
426        because when scanning forward to find the reference group, PCRE was not
427        taking into account the duplicate group numbers. A pattern such as
428        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
429    
430    26. Changed a few more instances of "const unsigned char *" to USPTR, making
431        the feature of a custom pointer more persuasive (as requested by a user).
432    
433    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
434        pcretest.c, inside #ifndefs, because it seems they are sometimes already
435        pre-defined.
436    
437    28. Added support for (*UTF8) at the start of a pattern.
438    
439    29. Arrange for flags added by the "release type" setting in CMake to be shown
440        in the configuration summary.
441    
442    
443    Version 7.8 05-Sep-08
444  ---------------------  ---------------------
445    
446   1. Applied Bob Rossi and Daniel G's patches to convert the build system to one  1.  Replaced UCP searching code with optimized version as implemented for Ad
447      that is more "standard", making use of automake and other autotools. There      Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
448        stage table and inline lookup instead of a function, giving speed ups of 2
449        to 5 times on some simple patterns that I tested. Permission was given to
450        distribute the MultiStage2.py script that generates the tables (it's not in
451        the tarball, but is in the Subversion repository).
452    
453    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
454        scripts.
455    
456    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
457        a group with a zero qualifier. The result of the study could be incorrect,
458        or the function might crash, depending on the pattern.
459    
460    4.  Caseless matching was not working for non-ASCII characters in back
461        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
462        It now works when Unicode Property Support is available.
463    
464    5.  In pcretest, an escape such as \x{de} in the data was always generating
465        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
466        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
467        truncation.
468    
469    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
470    
471    7.  Added two (int) casts to pcregrep when printing the difference of two
472        pointers, in case they are 64-bit values.
473    
474    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
475        test 2 if it fails.
476    
477    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
478        and a #define of that name to empty if it is not externally set. This is to
479        allow users of MSVC to set it if necessary.
480    
481    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
482        the convenience functions in the pcre_get.c source file.
483    
484    11. An option change at the start of a pattern that had top-level alternatives
485        could cause overwriting and/or a crash. This command provoked a crash in
486        some environments:
487    
488          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
489    
490        This potential security problem was recorded as CVE-2008-2371.
491    
492    12. For a pattern where the match had to start at the beginning or immediately
493        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
494        pcre_dfa_exec() could read past the end of the passed subject if there was
495        no match. To help with detecting such bugs (e.g. with valgrind), I modified
496        pcretest so that it places the subject at the end of its malloc-ed buffer.
497    
498    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
499        exec() might read past the end of the data buffer in UTF-8 mode.
500    
501    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
502        the data contained the byte 0x85 as part of a UTF-8 character within its
503        first line. This applied both to normal and DFA matching.
504    
505    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
506        /^[^d]*?$/8 failed to match "abc".
507    
508    16. Added a missing copyright notice to pcrecpp_internal.h.
509    
510    17. Make it more clear in the documentation that values returned from
511        pcre_exec() in ovector are byte offsets, not character counts.
512    
513    18. Tidied a few places to stop certain compilers from issuing warnings.
514    
515    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
516        supplied by Stefan Weber. I made a further small update for 7.8 because
517        there is a change of source arrangements: the pcre_searchfuncs.c module is
518        replaced by pcre_ucd.c.
519    
520    
521    Version 7.7 07-May-08
522    ---------------------
523    
524    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
525        a string to a long long, pretend we don't even have a long long." This is
526        done by checking for the strtoq, strtoll, and _strtoi64 functions.
527    
528    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
529        pre-7.6 versions, which defined a global no_arg variable instead of putting
530        it in the RE class. (See also #8 below.)
531    
532    3.  Remove a line of dead code, identified by coverity and reported by Nuno
533        Lopes.
534    
535    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
536    
537        (1) The include/exclude patterns were being applied to the whole pathnames
538            of files, instead of just to the final components.
539    
540        (2) If there was more than one level of directory, the subdirectories were
541            skipped unless they satisfied the include/exclude conditions. This is
542            inconsistent with GNU grep (and could even be seen as contrary to the
543            pcregrep specification - which I improved to make it absolutely clear).
544            The action now is always to scan all levels of directory, and just
545            apply the include/exclude patterns to regular files.
546    
547    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
548        --exclude_dir in the tests to avoid scanning .svn directories.
549    
550    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
551        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
552        doesn't support NULs in patterns.
553    
554    7.  Added some missing "const"s to declarations of static tables in
555        pcre_compile.c and pcre_dfa_exec.c.
556    
557    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
558        caused by fix #2  above. (Subsequently also a second patch to fix the
559        first patch. And a third patch - this was a messy problem.)
560    
561    9.  Applied Craig's patch to remove the use of push_back().
562    
563    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
564        matching function regexec().
565    
566    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
567        which, however, unlike Perl's \g{...}, are subroutine calls, not back
568        references. PCRE supports relative numbers with this syntax (I don't think
569        Oniguruma does).
570    
571    12. Previously, a group with a zero repeat such as (...){0} was completely
572        omitted from the compiled regex. However, this means that if the group
573        was called as a subroutine from elsewhere in the pattern, things went wrong
574        (an internal error was given). Such groups are now left in the compiled
575        pattern, with a new opcode that causes them to be skipped at execution
576        time.
577    
578    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
579        to the way PCRE behaves:
580    
581        (a) A lone ] character is dis-allowed (Perl treats it as data).
582    
583        (b) A back reference to an unmatched subpattern matches an empty string
584            (Perl fails the current match path).
585    
586        (c) A data ] in a character class must be notated as \] because if the
587            first data character in a class is ], it defines an empty class. (In
588            Perl it is not possible to have an empty class.) The empty class []
589            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
590            The negative empty class [^] matches any one character, independently
591            of the DOTALL setting.
592    
593    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
594        non-existent subpattern following a character class starting with ']' and
595        containing () gave an internal compiling error instead of "reference to
596        non-existent subpattern". Fortunately, when the pattern did exist, the
597        compiled code was correct. (When scanning forwards to check for the
598        existencd of the subpattern, it was treating the data ']' as terminating
599        the class, so got the count wrong. When actually compiling, the reference
600        was subsequently set up correctly.)
601    
602    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
603        it was being rejected as not supported by pcre_dfa_exec(), even though
604        other assertions are supported. I have made pcre_dfa_exec() support
605        (*FAIL).
606    
607    16. The implementation of 13c above involved the invention of a new opcode,
608        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
609        cannot be changed at match time, I realized I could make a small
610        improvement to matching performance by compiling OP_ALLANY instead of
611        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
612        on the OP_ANY path.
613    
614    17. Compiling pcretest on Windows with readline support failed without the
615        following two fixes: (1) Make the unistd.h include conditional on
616        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
617    
618    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
619        ncurses library to be included for pcretest when ReadLine support is
620        requested, but also to allow for it to be overridden. This patch came from
621        Daniel Bergström.
622    
623    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
624        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
625        any errors with the current Unicode tables. Thanks to Peter Kankowski for
626        spotting this.
627    
628    
629    Version 7.6 28-Jan-08
630    ---------------------
631    
632    1.  A character class containing a very large number of characters with
633        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
634        overflow.
635    
636    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
637        HAVE_LONG_LONG is not defined.
638    
639    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
640        bring them up to date and include new features. This patch includes:
641    
642        - Fixed PH's badly added libz and libbz2 support.
643        - Fixed a problem with static linking.
644        - Added pcredemo. [But later removed - see 7 below.]
645        - Fixed dftables problem and added an option.
646        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
647            HAVE_LONG_LONG.
648        - Added readline support for pcretest.
649        - Added an listing of the option settings after cmake has run.
650    
651    4.  A user submitted a patch to Makefile that makes it easy to create
652        "pcre.dll" under mingw when using Configure/Make. I added stuff to
653        Makefile.am that cause it to include this special target, without
654        affecting anything else. Note that the same mingw target plus all
655        the other distribution libraries and programs are now supported
656        when configuring with CMake (see 6 below) instead of with
657        Configure/Make.
658    
659    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
660        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
661        exported in the Windows port". It has not yet been confirmed that the patch
662        solves the problem, but it does no harm.
663    
664    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
665        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
666        with CMake, and also correct the comment about stack recursion.
667    
668    7.  Remove the automatic building of pcredemo from the ./configure system and
669        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
670        of a program that users should build themselves after PCRE is installed, so
671        building it automatically is not really right. What is more, it gave
672        trouble in some build environments.
673    
674    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
675    
676    
677    Version 7.5 10-Jan-08
678    ---------------------
679    
680    1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
681        values in parens when parsing an RE using the C++ wrapper."
682    
683    2.  Negative specials like \S did not work in character classes in UTF-8 mode.
684        Characters greater than 255 were excluded from the class instead of being
685        included.
686    
687    3.  The same bug as (2) above applied to negated POSIX classes such as
688        [:^space:].
689    
690    4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
691        defined or documented. It seems to have been a typo for PCRE_STATIC, so
692        I have changed it.
693    
694    5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
695        first named subpattern) and a construct such as (?&a) would reference the
696        first named subpattern whose name started with "a" (in other words, the
697        length check was missing). Both these problems are fixed. "Subpattern name
698        expected" is now given for (?&) (a zero-length name), and this patch also
699        makes it give the same error for \k'' (previously it complained that that
700        was a reference to a non-existent subpattern).
701    
702    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
703        this is right because (?- can be followed by option settings as well as by
704        digits. I have, however, made the messages clearer.
705    
706    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
707        than the number used in the conditional) now cause a compile-time error.
708        This is actually not compatible with Perl, which accepts such patterns, but
709        treats the conditional as always being FALSE (as PCRE used to), but it
710        seems to me that giving a diagnostic is better.
711    
712    8.  Change "alphameric" to the more common word "alphanumeric" in comments
713        and messages.
714    
715    9.  Fix two occurrences of "backslash" in comments that should have been
716        "backspace".
717    
718    10. Remove two redundant lines of code that can never be obeyed (their function
719        was moved elsewhere).
720    
721    11. The program that makes PCRE's Unicode character property table had a bug
722        which caused it to generate incorrect table entries for sequences of
723        characters that have the same character type, but are in different scripts.
724        It amalgamated them into a single range, with the script of the first of
725        them. In other words, some characters were in the wrong script. There were
726        thirteen such cases, affecting characters in the following ranges:
727    
728          U+002b0 - U+002c1
729          U+0060c - U+0060d
730          U+0061e - U+00612
731          U+0064b - U+0065e
732          U+0074d - U+0076d
733          U+01800 - U+01805
734          U+01d00 - U+01d77
735          U+01d9b - U+01dbf
736          U+0200b - U+0200f
737          U+030fc - U+030fe
738          U+03260 - U+0327f
739          U+0fb46 - U+0fbb1
740          U+10450 - U+1049d
741    
742    12. The -o option (show only the matching part of a line) for pcregrep was not
743        compatible with GNU grep in that, if there was more than one match in a
744        line, it showed only the first of them. It now behaves in the same way as
745        GNU grep.
746    
747    13. If the -o and -v options were combined for pcregrep, it printed a blank
748        line for every non-matching line. GNU grep prints nothing, and pcregrep now
749        does the same. The return code can be used to tell if there were any
750        non-matching lines.
751    
752    14. Added --file-offsets and --line-offsets to pcregrep.
753    
754    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
755        infinitely looping recursion. The bug was that positive lookaheads were not
756        being skipped when checking for a possible empty match (negative lookaheads
757        and both kinds of lookbehind were skipped).
758    
759    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
760        inclusion of <windows.h> to before rather than after the definition of
761        INVALID_FILE_ATTRIBUTES (patch from David Byron).
762    
763    17. Specifying a possessive quantifier with a specific limit for a Unicode
764        character property caused pcre_compile() to compile bad code, which led at
765        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
766        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
767        caused the error; without that there was no problem.
768    
769    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
770    
771    19. Added --enable-pcretest-libreadline.
772    
773    20. In pcrecpp.cc, the variable 'count' was incremented twice in
774        RE::GlobalReplace(). As a result, the number of replacements returned was
775        double what it should be. I removed one of the increments, but Craig sent a
776        later patch that removed the other one (the right fix) and added unit tests
777        that check the return values (which was not done before).
778    
779    21. Several CMake things:
780    
781        (1) Arranged that, when cmake is used on Unix, the libraries end up with
782            the names libpcre and libpcreposix, not just pcre and pcreposix.
783    
784        (2) The above change means that pcretest and pcregrep are now correctly
785            linked with the newly-built libraries, not previously installed ones.
786    
787        (3) Added PCRE_SUPPORT_LIBREADLINE, PCRE_SUPPORT_LIBZ, PCRE_SUPPORT_LIBBZ2.
788    
789    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
790        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
791        UTF-8 newline character). The key issue is that the pattern starts .*;
792        this means that the match must be either at the beginning, or after a
793        newline. The bug was in the code for advancing after a failed match and
794        checking that the new position followed a newline. It was not taking
795        account of UTF-8 characters correctly.
796    
797    23. PCRE was behaving differently from Perl in the way it recognized POSIX
798        character classes. PCRE was not treating the sequence [:...:] as a
799        character class unless the ... were all letters. Perl, however, seems to
800        allow any characters between [: and :], though of course it rejects as
801        unknown any "names" that contain non-letters, because all the known class
802        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
803        for example, whereas PCRE did not - it did not recognize a POSIX character
804        class. This seemed a bit dangerous, so the code has been changed to be
805        closer to Perl. The behaviour is not identical to Perl, because PCRE will
806        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
807        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
808        Perl does, and where it didn't before.
809    
810    24. Rewrite so as to remove the single use of %n from pcregrep because in some
811        Windows environments %n is disabled by default.
812    
813    
814    Version 7.4 21-Sep-07
815    ---------------------
816    
817    1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This
818        means that a class such as [\s] counted as "explicit reference to CR or
819        LF". That isn't really right - the whole point of the change was to try to
820        help when there was an actual mention of one of the two characters. So now
821        the change happens only if \r or \n (or a literal CR or LF) character is
822        encountered.
823    
824    2.  The 32-bit options word was also used for 6 internal flags, but the numbers
825        of both had grown to the point where there were only 3 bits left.
826        Fortunately, there was spare space in the data structure, and so I have
827        moved the internal flags into a new 16-bit field to free up more option
828        bits.
829    
830    3.  The appearance of (?J) at the start of a pattern set the DUPNAMES option,
831        but did not set the internal JCHANGED flag - either of these is enough to
832        control the way the "get" function works - but the PCRE_INFO_JCHANGED
833        facility is supposed to tell if (?J) was ever used, so now (?J) at the
834        start sets both bits.
835    
836    4.  Added options (at build time, compile time, exec time) to change \R from
837        matching any Unicode line ending sequence to just matching CR, LF, or CRLF.
838    
839    5.  doc/pcresyntax.html was missing from the distribution.
840    
841    6.  Put back the definition of PCRE_ERROR_NULLWSLIMIT, for backward
842        compatibility, even though it is no longer used.
843    
844    7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and
845        strtoull to pcrecpp.cc to select the available functions in WIN32 when the
846        windows.h file is present (where different names are used). [This was
847        reversed later after testing - see 16 below.]
848    
849    8.  Changed all #include <config.h> to #include "config.h". There were also
850        some further <pcre.h> cases that I changed to "pcre.h".
851    
852    9.  When pcregrep was used with the --colour option, it missed the line ending
853        sequence off the lines that it output.
854    
855    10. It was pointed out to me that arrays of string pointers cause lots of
856        relocations when a shared library is dynamically loaded. A technique of
857        using a single long string with a table of offsets can drastically reduce
858        these. I have refactored PCRE in four places to do this. The result is
859        dramatic:
860    
861          Originally:                          290
862          After changing UCP table:            187
863          After changing error message table:   43
864          After changing table of "verbs"       36
865          After changing table of Posix names   22
866    
867        Thanks to the folks working on Gregex for glib for this insight.
868    
869    11. --disable-stack-for-recursion caused compiling to fail unless -enable-
870        unicode-properties was also set.
871    
872    12. Updated the tests so that they work when \R is defaulted to ANYCRLF.
873    
874    13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously
875        checked only for CRLF.
876    
877    14. Added casts to pcretest.c to avoid compiler warnings.
878    
879    15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
880    
881    16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
882        and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
883        entirely. This removes changes made in 7 above.
884    
885    17. The CMake files have been updated, and there is now more information about
886        building with CMake in the NON-UNIX-USE document.
887    
888    
889    Version 7.3 28-Aug-07
890    ---------------------
891    
892     1. In the rejigging of the build system that eventually resulted in 7.1, the
893        line "#include <pcre.h>" was included in pcre_internal.h. The use of angle
894        brackets there is not right, since it causes compilers to look for an
895        installed pcre.h, not the version that is in the source that is being
896        compiled (which of course may be different). I have changed it back to:
897    
898          #include "pcre.h"
899    
900        I have a vague recollection that the change was concerned with compiling in
901        different directories, but in the new build system, that is taken care of
902        by the VPATH setting the Makefile.
903    
904     2. The pattern .*$ when run in not-DOTALL UTF-8 mode with newline=any failed
905        when the subject happened to end in the byte 0x85 (e.g. if the last
906        character was \x{1ec5}). *Character* 0x85 is one of the "any" newline
907        characters but of course it shouldn't be taken as a newline when it is part
908        of another character. The bug was that, for an unlimited repeat of . in
909        not-DOTALL UTF-8 mode, PCRE was advancing by bytes rather than by
910        characters when looking for a newline.
911    
912     3. A small performance improvement in the DOTALL UTF-8 mode .* case.
913    
914     4. Debugging: adjusted the names of opcodes for different kinds of parentheses
915        in debug output.
916    
917     5. Arrange to use "%I64d" instead of "%lld" and "%I64u" instead of "%llu" for
918        long printing in the pcrecpp unittest when running under MinGW.
919    
920     6. ESC_K was left out of the EBCDIC table.
921    
922     7. Change 7.0/38 introduced a new limit on the number of nested non-capturing
923        parentheses; I made it 1000, which seemed large enough. Unfortunately, the
924        limit also applies to "virtual nesting" when a pattern is recursive, and in
925        this case 1000 isn't so big. I have been able to remove this limit at the
926        expense of backing off one optimization in certain circumstances. Normally,
927        when pcre_exec() would call its internal match() function recursively and
928        immediately return the result unconditionally, it uses a "tail recursion"
929        feature to save stack. However, when a subpattern that can match an empty
930        string has an unlimited repetition quantifier, it no longer makes this
931        optimization. That gives it a stack frame in which to save the data for
932        checking that an empty string has been matched. Previously this was taken
933        from the 1000-entry workspace that had been reserved. So now there is no
934        explicit limit, but more stack is used.
935    
936     8. Applied Daniel's patches to solve problems with the import/export magic
937        syntax that is required for Windows, and which was going wrong for the
938        pcreposix and pcrecpp parts of the library. These were overlooked when this
939        problem was solved for the main library.
940    
941     9. There were some crude static tests to avoid integer overflow when computing
942        the size of patterns that contain repeated groups with explicit upper
943        limits. As the maximum quantifier is 65535, the maximum group length was
944        set at 30,000 so that the product of these two numbers did not overflow a
945        32-bit integer. However, it turns out that people want to use groups that
946        are longer than 30,000 bytes (though not repeat them that many times).
947        Change 7.0/17 (the refactoring of the way the pattern size is computed) has
948        made it possible to implement the integer overflow checks in a much more
949        dynamic way, which I have now done. The artificial limitation on group
950        length has been removed - we now have only the limit on the total length of
951        the compiled pattern, which depends on the LINK_SIZE setting.
952    
953    10. Fixed a bug in the documentation for get/copy named substring when
954        duplicate names are permitted. If none of the named substrings are set, the
955        functions return PCRE_ERROR_NOSUBSTRING (7); the doc said they returned an
956        empty string.
957    
958    11. Because Perl interprets \Q...\E at a high level, and ignores orphan \E
959        instances, patterns such as [\Q\E] or [\E] or even [^\E] cause an error,
960        because the ] is interpreted as the first data character and the
961        terminating ] is not found. PCRE has been made compatible with Perl in this
962        regard. Previously, it interpreted [\Q\E] as an empty class, and [\E] could
963        cause memory overwriting.
964    
965    10. Like Perl, PCRE automatically breaks an unlimited repeat after an empty
966        string has been matched (to stop an infinite loop). It was not recognizing
967        a conditional subpattern that could match an empty string if that
968        subpattern was within another subpattern. For example, it looped when
969        trying to match  (((?(1)X|))*)  but it was OK with  ((?(1)X|)*)  where the
970        condition was not nested. This bug has been fixed.
971    
972    12. A pattern like \X?\d or \P{L}?\d in non-UTF-8 mode could cause a backtrack
973        past the start of the subject in the presence of bytes with the top bit
974        set, for example "\x8aBCD".
975    
976    13. Added Perl 5.10 experimental backtracking controls (*FAIL), (*F), (*PRUNE),
977        (*SKIP), (*THEN), (*COMMIT), and (*ACCEPT).
978    
979    14. Optimized (?!) to (*FAIL).
980    
981    15. Updated the test for a valid UTF-8 string to conform to the later RFC 3629.
982        This restricts code points to be within the range 0 to 0x10FFFF, excluding
983        the "low surrogate" sequence 0xD800 to 0xDFFF. Previously, PCRE allowed the
984        full range 0 to 0x7FFFFFFF, as defined by RFC 2279. Internally, it still
985        does: it's just the validity check that is more restrictive.
986    
987    16. Inserted checks for integer overflows during escape sequence (backslash)
988        processing, and also fixed erroneous offset values for syntax errors during
989        backslash processing.
990    
991    17. Fixed another case of looking too far back in non-UTF-8 mode (cf 12 above)
992        for patterns like [\PPP\x8a]{1,}\x80 with the subject "A\x80".
993    
994    18. An unterminated class in a pattern like (?1)\c[ with a "forward reference"
995        caused an overrun.
996    
997    19. A pattern like (?:[\PPa*]*){8,} which had an "extended class" (one with
998        something other than just ASCII characters) inside a group that had an
999        unlimited repeat caused a loop at compile time (while checking to see
1000        whether the group could match an empty string).
1001    
1002    20. Debugging a pattern containing \p or \P could cause a crash. For example,
1003        [\P{Any}] did so. (Error in the code for printing property names.)
1004    
1005    21. An orphan \E inside a character class could cause a crash.
1006    
1007    22. A repeated capturing bracket such as (A)? could cause a wild memory
1008        reference during compilation.
1009    
1010    23. There are several functions in pcre_compile() that scan along a compiled
1011        expression for various reasons (e.g. to see if it's fixed length for look
1012        behind). There were bugs in these functions when a repeated \p or \P was
1013        present in the pattern. These operators have additional parameters compared
1014        with \d, etc, and these were not being taken into account when moving along
1015        the compiled data. Specifically:
1016    
1017        (a) A item such as \p{Yi}{3} in a lookbehind was not treated as fixed
1018            length.
1019    
1020        (b) An item such as \pL+ within a repeated group could cause crashes or
1021            loops.
1022    
1023        (c) A pattern such as \p{Yi}+(\P{Yi}+)(?1) could give an incorrect
1024            "reference to non-existent subpattern" error.
1025    
1026        (d) A pattern like (\P{Yi}{2}\277)? could loop at compile time.
1027    
1028    24. A repeated \S or \W in UTF-8 mode could give wrong answers when multibyte
1029        characters were involved (for example /\S{2}/8g with "A\x{a3}BC").
1030    
1031    25. Using pcregrep in multiline, inverted mode (-Mv) caused it to loop.
1032    
1033    26. Patterns such as [\P{Yi}A] which include \p or \P and just one other
1034        character were causing crashes (broken optimization).
1035    
1036    27. Patterns such as (\P{Yi}*\277)* (group with possible zero repeat containing
1037        \p or \P) caused a compile-time loop.
1038    
1039    28. More problems have arisen in unanchored patterns when CRLF is a valid line
1040        break. For example, the unstudied pattern [\r\n]A does not match the string
1041        "\r\nA" because change 7.0/46 below moves the current point on by two
1042        characters after failing to match at the start. However, the pattern \nA
1043        *does* match, because it doesn't start till \n, and if [\r\n]A is studied,
1044        the same is true. There doesn't seem any very clean way out of this, but
1045        what I have chosen to do makes the common cases work: PCRE now takes note
1046        of whether there can be an explicit match for \r or \n anywhere in the
1047        pattern, and if so, 7.0/46 no longer applies. As part of this change,
1048        there's a new PCRE_INFO_HASCRORLF option for finding out whether a compiled
1049        pattern has explicit CR or LF references.
1050    
1051    29. Added (*CR) etc for changing newline setting at start of pattern.
1052    
1053    
1054    Version 7.2 19-Jun-07
1055    ---------------------
1056    
1057     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
1058        which is apparently normally available under Windows.
1059    
1060     2. Re-jig the pcregrep tests with different newline settings in an attempt
1061        to make them independent of the local environment's newline setting.
1062    
1063     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
1064    
1065     4. Some of the "internals" tests were previously cut out when the link size
1066        was not 2, because the output contained actual offsets. The recent new
1067        "Z" feature of pcretest means that these can be cut out, making the tests
1068        usable with all link sizes.
1069    
1070     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
1071        stack recursion. This gives a massive performance boost under BSD, but just
1072        a small improvement under Linux. However, it saves one field in the frame
1073        in all cases.
1074    
1075     6. Added more features from the forthcoming Perl 5.10:
1076    
1077        (a) (?-n) (where n is a string of digits) is a relative subroutine or
1078            recursion call. It refers to the nth most recently opened parentheses.
1079    
1080        (b) (?+n) is also a relative subroutine call; it refers to the nth next
1081            to be opened parentheses.
1082    
1083        (c) Conditions that refer to capturing parentheses can be specified
1084            relatively, for example, (?(-2)... or (?(+3)...
1085    
1086        (d) \K resets the start of the current match so that everything before
1087            is not part of it.
1088    
1089        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
1090    
1091        (f) \g{name} is another synonym - part of Perl 5.10's unification of
1092            reference syntax.
1093    
1094        (g) (?| introduces a group in which the numbering of parentheses in each
1095            alternative starts with the same number.
1096    
1097        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
1098    
1099     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
1100        PCRE_INFO_JCHANGED.
1101    
1102     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
1103        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
1104        for detecting groups that can match an empty string.
1105    
1106     9. A pattern with a very large number of alternatives (more than several
1107        hundred) was running out of internal workspace during the pre-compile
1108        phase, where pcre_compile() figures out how much memory will be needed. A
1109        bit of new cunning has reduced the workspace needed for groups with
1110        alternatives. The 1000-alternative test pattern now uses 12 bytes of
1111        workspace instead of running out of the 4096 that are available.
1112    
1113    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
1114    
1115    11. Applied patch from Google to remove an optimization that didn't quite work.
1116        The report of the bug said:
1117    
1118          pcrecpp::RE("a*").FullMatch("aaa") matches, while
1119          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
1120          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
1121    
1122    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
1123        it matched the wrong number of bytes.
1124    
1125    
1126    Version 7.1 24-Apr-07
1127    ---------------------
1128    
1129     1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
1130        that is more "standard", making use of automake and other Autotools. There
1131      is some re-arrangement of the files and adjustment of comments consequent      is some re-arrangement of the files and adjustment of comments consequent
1132      on this.      on this.
1133    
1134   2. Part of the patch fixed a problem with the pcregrep tests. The test of -r   2. Part of the patch fixed a problem with the pcregrep tests. The test of -r
1135      for recursive directory scanning broke on some systems because the files      for recursive directory scanning broke on some systems because the files
1136      are not scanned in any specific order and on different systems the order      are not scanned in any specific order and on different systems the order
1137      was different. A call to "sort" has been inserted into RunGrepTest for the      was different. A call to "sort" has been inserted into RunGrepTest for the
1138      approprate test as a short-term fix. In the longer term there may be an      approprate test as a short-term fix. In the longer term there may be an
1139      alternative.      alternative.
1140    
1141   3. I had an email from Eric Raymond about problems translating some of PCRE's   3. I had an email from Eric Raymond about problems translating some of PCRE's
1142      man pages to HTML (despite the fact that I distribute HTML pages, some      man pages to HTML (despite the fact that I distribute HTML pages, some
1143      people do their own conversions for various reasons). The problems      people do their own conversions for various reasons). The problems
1144      concerned the use of low-level troff macros .br and .in. I have therefore      concerned the use of low-level troff macros .br and .in. I have therefore
1145      removed all such uses from the man pages (some were redundant, some could      removed all such uses from the man pages (some were redundant, some could
1146      be replaced by .nf/.fi pairs). The maintain/132html script that I use to      be replaced by .nf/.fi pairs). The 132html script that I use to generate
1147      generate HTML has been updated to handle .nf/.fi and to complain if it      HTML has been updated to handle .nf/.fi and to complain if it encounters
1148      encounters .br or .in.      .br or .in.
1149    
1150   4. Updated comments in configure.ac that get placed in config.h.in and also   4. Updated comments in configure.ac that get placed in config.h.in and also
1151      arranged for config.h to be included in the distribution, for the benefit      arranged for config.h to be included in the distribution, with the name
1152      of those who have to compile without Autotools (compare pcre.h).      config.h.generic, for the benefit of those who have to compile without
1153        Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
1154    
1155     5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan
1156        Weber: (1) pcre_internal.h was missing some function renames; (2) updated
1157        makevp.bat for the current PCRE, using the additional files
1158        makevp_c.txt, makevp_l.txt, and pcregexp.pas.
1159    
1160     6. A Windows user reported a minor discrepancy with test 2, which turned out
1161        to be caused by a trailing space on an input line that had got lost in his
1162        copy. The trailing space was an accident, so I've just removed it.
1163    
1164     7. Add -Wl,-R... flags in pcre-config.in for *BSD* systems, as I'm told
1165        that is needed.
1166    
1167     8. Mark ucp_table (in ucptable.h) and ucp_gentype (in pcre_ucp_searchfuncs.c)
1168        as "const" (a) because they are and (b) because it helps the PHP
1169        maintainers who have recently made a script to detect big data structures
1170        in the php code that should be moved to the .rodata section. I remembered
1171        to update Builducptable as well, so it won't revert if ucptable.h is ever
1172        re-created.
1173    
1174     9. Added some extra #ifdef SUPPORT_UTF8 conditionals into pcretest.c,
1175        pcre_printint.src, pcre_compile.c, pcre_study.c, and pcre_tables.c, in
1176        order to be able to cut out the UTF-8 tables in the latter when UTF-8
1177        support is not required. This saves 1.5-2K of code, which is important in
1178        some applications.
1179    
1180        Later: more #ifdefs are needed in pcre_ord2utf8.c and pcre_valid_utf8.c
1181        so as not to refer to the tables, even though these functions will never be
1182        called when UTF-8 support is disabled. Otherwise there are problems with a
1183        shared library.
1184    
1185    10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:
1186    
1187        (a) It was defining its arguments as char * instead of void *.
1188    
1189        (b) It was assuming that all moves were upwards in memory; this was true
1190            a long time ago when I wrote it, but is no longer the case.
1191    
1192        The emulated memove() is provided for those environments that have neither
1193        memmove() nor bcopy(). I didn't think anyone used it these days, but that
1194        is clearly not the case, as these two bugs were recently reported.
1195    
1196    11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
1197        and Detrail to create the HTML documentation, the .txt form of the man
1198        pages, and it removes trailing spaces from listed files. It also creates
1199        pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter
1200        case, it wraps all the #defines with #ifndefs. This script should be run
1201        before "make dist".
1202    
1203    12. Fixed two fairly obscure bugs concerned with quantified caseless matching
1204        with Unicode property support.
1205    
1206        (a) For a maximizing quantifier, if the two different cases of the
1207            character were of different lengths in their UTF-8 codings (there are
1208            some cases like this - I found 11), and the matching function had to
1209            back up over a mixture of the two cases, it incorrectly assumed they
1210            were both the same length.
1211    
1212        (b) When PCRE was configured to use the heap rather than the stack for
1213            recursion during matching, it was not correctly preserving the data for
1214            the other case of a UTF-8 character when checking ahead for a match
1215            while processing a minimizing repeat. If the check also involved
1216            matching a wide character, but failed, corruption could cause an
1217            erroneous result when trying to check for a repeat of the original
1218            character.
1219    
1220    13. Some tidying changes to the testing mechanism:
1221    
1222        (a) The RunTest script now detects the internal link size and whether there
1223            is UTF-8 and UCP support by running ./pcretest -C instead of relying on
1224            values substituted by "configure". (The RunGrepTest script already did
1225            this for UTF-8.) The configure.ac script no longer substitutes the
1226            relevant variables.
1227    
1228        (b) The debugging options /B and /D in pcretest show the compiled bytecode
1229            with length and offset values. This means that the output is different
1230            for different internal link sizes. Test 2 is skipped for link sizes
1231            other than 2 because of this, bypassing the problem. Unfortunately,
1232            there was also a test in test 3 (the locale tests) that used /B and
1233            failed for link sizes other than 2. Rather than cut the whole test out,
1234            I have added a new /Z option to pcretest that replaces the length and
1235            offset values with spaces. This is now used to make test 3 independent
1236            of link size. (Test 2 will be tidied up later.)
1237    
1238    14. If erroroffset was passed as NULL to pcre_compile, it provoked a
1239        segmentation fault instead of returning the appropriate error message.
1240    
1241    15. In multiline mode when the newline sequence was set to "any", the pattern
1242        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
1243        This doesn't seem right; it now treats the CRLF combination as the line
1244        ending, and so does not match in that case. It's only a pattern such as ^$
1245        that would hit this one: something like ^ABC$ would have failed after \r
1246        and then tried again after \r\n.
1247    
1248    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
1249        in an attempt to make files that differ only in their line terminators
1250        compare equal. This works on Linux.
1251    
1252    17. Under certain error circumstances pcregrep might try to free random memory
1253        as it exited. This is now fixed, thanks to valgrind.
1254    
1255    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
1256        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
1257        was because its rules for how to advance for /g after matching an empty
1258        string at the end of a line did not allow for this case. They now check for
1259        it specially.
1260    
1261    20. pcretest is supposed to handle patterns and data of any length, by
1262        extending its buffers when necessary. It was getting this wrong when the
1263        buffer for a data line had to be extended.
1264    
1265    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
1266        CRLF as a newline sequence.
1267    
1268    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
1269        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
1270        I have nevertheless tidied it up.
1271    
1272    23. Added some casts to kill warnings from HP-UX ia64 compiler.
1273    
1274    24. Added a man page for pcre-config.
1275    
1276    
1277  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06
1278  ---------------------  ---------------------

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