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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.1 05-Mar-07  Version 8.10 03 May-2010
5    ------------------------
6    
7    1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
8        THEN.
9    
10    2.  (*ACCEPT) was not working when inside an atomic group.
11    
12    3.  Inside a character class, \B is treated as a literal by default, but
13        faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
14        causes the error). The code is unchanged, but I tidied the documentation.
15    
16    4.  Inside a character class, PCRE always treated \R and \X as literals,
17        whereas Perl faults them if its -w option is set. I have changed PCRE so
18        that it faults them when PCRE_EXTRA is set.
19    
20    5.  Added support for \N, which always matches any character other than
21        newline. (It is the same as "." when PCRE_DOTALL is not set.)
22    
23    6.  When compiling pcregrep with newer versions of gcc which may have
24        FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
25        declared with attribute warn_unused_result" were given. Just casting the
26        result to (void) does not stop the warnings; a more elaborate fudge is
27        needed. I've used a macro to implement this.
28    
29    7.  Minor change to pcretest.c to avoid a compiler warning.
30    
31    8.  Added four artifical Unicode properties to help with an option to make
32        \s etc use properties (see next item). The new properties are: Xan
33        (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
34    
35    9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
36        use Unicode properties. (*UCP) at the start of a pattern can be used to set
37        this option. Modified pcretest to add /W to test this facility. Added
38        REG_UCP to make it available via the POSIX interface.
39    
40    10. Added --line-buffered to pcregrep.
41    
42    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
43        studied, and the match started with a letter with a code point greater than
44        127 whose first byte was different to the first byte of the other case of
45        the letter, the other case of this starting letter was not recognized.
46    
47    12. pcreposix.c included pcre.h before including pcre_internal.h. This caused a
48        conflict in the definition of PCRE_EXP_DECL. I have removed the include of
49        pcre.h as pcre_internal.h includes pcre.h itself. (This may be a bit of
50        historical tidying that never got done.)
51    
52    
53    
54    Version 8.02 19-Mar-2010
55    ------------------------
56    
57    1.  The Unicode data tables have been updated to Unicode 5.2.0.
58    
59    2.  Added the option --libs-cpp to pcre-config, but only when C++ support is
60        configured.
61    
62    3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the
63        original author of that file, following a query about its status.
64    
65    4.  On systems that do not have stdint.h (e.g. Solaris), check for and include
66        inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.
67    
68    5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
69        quantifier applied to a forward-referencing subroutine call, could compile
70        incorrect code or give the error "internal error: previously-checked
71        referenced subpattern not found".
72    
73    6.  Both MS Visual Studio and Symbian OS have problems with initializing
74        variables to point to external functions. For these systems, therefore,
75        pcre_malloc etc. are now initialized to local functions that call the
76        relevant global functions.
77    
78    7.  There were two entries missing in the vectors called coptable and poptable
79        in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.
80        I've fixed the data, and added a kludgy way of testing at compile time that
81        the lengths are correct (equal to the number of opcodes).
82    
83    8.  Following on from 7, I added a similar kludge to check the length of the
84        eint vector in pcreposix.c.
85    
86    9.  Error texts for pcre_compile() are held as one long string to avoid too
87        much relocation at load time. To find a text, the string is searched,
88        counting zeros. There was no check for running off the end of the string,
89        which could happen if a new error number was added without updating the
90        string.
91    
92    10. \K gave a compile-time error if it appeared in a lookbehind assersion.
93    
94    11. \K was not working if it appeared in an atomic group or in a group that
95        was called as a "subroutine", or in an assertion. Perl 5.11 documents that
96        \K is "not well defined" if used in an assertion. PCRE now accepts it if
97        the assertion is positive, but not if it is negative.
98    
99    12. Change 11 fortuitously reduced the size of the stack frame used in the
100        "match()" function of pcre_exec.c by one pointer. Forthcoming
101        implementation of support for (*MARK) will need an extra pointer on the
102        stack; I have reserved it now, so that the stack frame size does not
103        decrease.
104    
105    13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other
106        item in branch that calls a recursion is a subroutine call - as in the
107        second branch in the above example - was incorrectly given the compile-
108        time error "recursive call could loop indefinitely" because pcre_compile()
109        was not correctly checking the subroutine for matching a non-empty string.
110    
111    14. The checks for overrunning compiling workspace could trigger after an
112        overrun had occurred. This is a "should never occur" error, but it can be
113        triggered by pathological patterns such as hundreds of nested parentheses.
114        The checks now trigger 100 bytes before the end of the workspace.
115    
116    15. Fix typo in configure.ac: "srtoq" should be "strtoq".
117    
118    
119    Version 8.01 19-Jan-2010
120    ------------------------
121    
122    1.  If a pattern contained a conditional subpattern with only one branch (in
123        particular, this includes all (*DEFINE) patterns), a call to pcre_study()
124        computed the wrong minimum data length (which is of course zero for such
125        subpatterns). This could cause incorrect "no match" results.
126    
127    2.  For patterns such as (?i)a(?-i)b|c where an option setting at the start of
128        the pattern is reset in the first branch, pcre_compile() failed with
129        "internal error: code overflow at offset...". This happened only when
130        the reset was to the original external option setting. (An optimization
131        abstracts leading options settings into an external setting, which was the
132        cause of this.)
133    
134    3.  A pattern such as ^(?!a(*SKIP)b) where a negative assertion contained one
135        of the verbs SKIP, PRUNE, or COMMIT, did not work correctly. When the
136        assertion pattern did not match (meaning that the assertion was true), it
137        was incorrectly treated as false if the SKIP had been reached during the
138        matching. This also applied to assertions used as conditions.
139    
140    4.  If an item that is not supported by pcre_dfa_exec() was encountered in an
141        assertion subpattern, including such a pattern used as a condition,
142        unpredictable results occurred, instead of the error return
143        PCRE_ERROR_DFA_UITEM.
144    
145    5.  The C++ GlobalReplace function was not working like Perl for the special
146        situation when an empty string is matched. It now does the fancy magic
147        stuff that is necessary.
148    
149    6.  In pcre_internal.h, obsolete includes to setjmp.h and stdarg.h have been
150        removed. (These were left over from very, very early versions of PCRE.)
151    
152    7.  Some cosmetic changes to the code to make life easier when compiling it
153        as part of something else:
154    
155        (a) Change DEBUG to PCRE_DEBUG.
156    
157        (b) In pcre_compile(), rename the member of the "branch_chain" structure
158            called "current" as "current_branch", to prevent a collision with the
159            Linux macro when compiled as a kernel module.
160    
161        (c) In pcre_study(), rename the function set_bit() as set_table_bit(), to
162            prevent a collision with the Linux macro when compiled as a kernel
163            module.
164    
165    8.  In pcre_compile() there are some checks for integer overflows that used to
166        cast potentially large values to (double). This has been changed to that
167        when building, a check for int64_t is made, and if it is found, it is used
168        instead, thus avoiding the use of floating point arithmetic. (There is no
169        other use of FP in PCRE.) If int64_t is not found, the fallback is to
170        double.
171    
172    9.  Added two casts to avoid signed/unsigned warnings from VS Studio Express
173        2005 (difference between two addresses compared to an unsigned value).
174    
175    10. Change the standard AC_CHECK_LIB test for libbz2 in configure.ac to a
176        custom one, because of the following reported problem in Windows:
177    
178          - libbz2 uses the Pascal calling convention (WINAPI) for the functions
179              under Win32.
180          - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",
181              therefore missing the function definition.
182          - The compiler thus generates a "C" signature for the test function.
183          - The linker fails to find the "C" function.
184          - PCRE fails to configure if asked to do so against libbz2.
185    
186    11. When running libtoolize from libtool-2.2.6b as part of autogen.sh, these
187        messages were output:
188    
189          Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and
190          rerunning libtoolize, to keep the correct libtool macros in-tree.
191          Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
192    
193        I have done both of these things.
194    
195    12. Although pcre_dfa_exec() does not use nearly as much stack as pcre_exec()
196        most of the time, it *can* run out if it is given a pattern that contains a
197        runaway infinite recursion. I updated the discussion in the pcrestack man
198        page.
199    
200    13. Now that we have gone to the x.xx style of version numbers, the minor
201        version may start with zero. Using 08 or 09 is a bad idea because users
202        might check the value of PCRE_MINOR in their code, and 08 or 09 may be
203        interpreted as invalid octal numbers. I've updated the previous comment in
204        configure.ac, and also added a check that gives an error if 08 or 09 are
205        used.
206    
207    14. Change 8.00/11 was not quite complete: code had been accidentally omitted,
208        causing partial matching to fail when the end of the subject matched \W
209        in a UTF-8 pattern where \W was quantified with a minimum of 3.
210    
211    15. There were some discrepancies between the declarations in pcre_internal.h
212        of _pcre_is_newline(), _pcre_was_newline(), and _pcre_valid_utf8() and
213        their definitions. The declarations used "const uschar *" and the
214        definitions used USPTR. Even though USPTR is normally defined as "const
215        unsigned char *" (and uschar is typedeffed as "unsigned char"), it was
216        reported that: "This difference in casting confuses some C++ compilers, for
217        example, SunCC recognizes above declarations as different functions and
218        generates broken code for hbpcre." I have changed the declarations to use
219        USPTR.
220    
221    16. GNU libtool is named differently on some systems. The autogen.sh script now
222        tries several variants such as glibtoolize (MacOSX) and libtoolize1x
223        (FreeBSD).
224    
225    17. Applied Craig's patch that fixes an HP aCC compile error in pcre 8.00
226        (strtoXX undefined when compiling pcrecpp.cc). The patch contains this
227        comment: "Figure out how to create a longlong from a string: strtoll and
228        equivalent. It's not enough to call AC_CHECK_FUNCS: hpux has a strtoll, for
229        instance, but it only takes 2 args instead of 3!"
230    
231    18. A subtle bug concerned with back references has been fixed by a change of
232        specification, with a corresponding code fix. A pattern such as
233        ^(xa|=?\1a)+$ which contains a back reference inside the group to which it
234        refers, was giving matches when it shouldn't. For example, xa=xaaa would
235        match that pattern. Interestingly, Perl (at least up to 5.11.3) has the
236        same bug. Such groups have to be quantified to be useful, or contained
237        inside another quantified group. (If there's no repetition, the reference
238        can never match.) The problem arises because, having left the group and
239        moved on to the rest of the pattern, a later failure that backtracks into
240        the group uses the captured value from the final iteration of the group
241        rather than the correct earlier one. I have fixed this in PCRE by forcing
242        any group that contains a reference to itself to be an atomic group; that
243        is, there cannot be any backtracking into it once it has completed. This is
244        similar to recursive and subroutine calls.
245    
246    
247    Version 8.00 19-Oct-09
248    ----------------------
249    
250    1.  The table for translating pcre_compile() error codes into POSIX error codes
251        was out-of-date, and there was no check on the pcre_compile() error code
252        being within the table. This could lead to an OK return being given in
253        error.
254    
255    2.  Changed the call to open a subject file in pcregrep from fopen(pathname,
256        "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
257        in a Windows environment.
258    
259    3.  The pcregrep --count option prints the count for each file even when it is
260        zero, as does GNU grep. However, pcregrep was also printing all files when
261        --files-with-matches was added. Now, when both options are given, it prints
262        counts only for those files that have at least one match. (GNU grep just
263        prints the file name in this circumstance, but including the count seems
264        more useful - otherwise, why use --count?) Also ensured that the
265        combination -clh just lists non-zero counts, with no names.
266    
267    4.  The long form of the pcregrep -F option was incorrectly implemented as
268        --fixed_strings instead of --fixed-strings. This is an incompatible change,
269        but it seems right to fix it, and I didn't think it was worth preserving
270        the old behaviour.
271    
272    5.  The command line items --regex=pattern and --regexp=pattern were not
273        recognized by pcregrep, which required --regex pattern or --regexp pattern
274        (with a space rather than an '='). The man page documented the '=' forms,
275        which are compatible with GNU grep; these now work.
276    
277    6.  No libpcreposix.pc file was created for pkg-config; there was just
278        libpcre.pc and libpcrecpp.pc. The omission has been rectified.
279    
280    7.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
281        when UCP support is not needed, by modifying the Python script that
282        generates it from Unicode data files. This should not matter if the module
283        is correctly used as a library, but I received one complaint about 50K of
284        unwanted data. My guess is that the person linked everything into his
285        program rather than using a library. Anyway, it does no harm.
286    
287    8.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
288        was a minimum greater than 1 for a wide character in a possessive
289        repetition. The same bug could also affect patterns like /(\x{ff}{0,2})*/8
290        which had an unlimited repeat of a nested, fixed maximum repeat of a wide
291        character. Chaos in the form of incorrect output or a compiling loop could
292        result.
293    
294    9.  The restrictions on what a pattern can contain when partial matching is
295        requested for pcre_exec() have been removed. All patterns can now be
296        partially matched by this function. In addition, if there are at least two
297        slots in the offset vector, the offset of the earliest inspected character
298        for the match and the offset of the end of the subject are set in them when
299        PCRE_ERROR_PARTIAL is returned.
300    
301    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
302        synonymous with PCRE_PARTIAL, for backwards compatibility, and
303        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
304        and may be more useful for multi-segment matching.
305    
306    11. Partial matching with pcre_exec() is now more intuitive. A partial match
307        used to be given if ever the end of the subject was reached; now it is
308        given only if matching could not proceed because another character was
309        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
310        string "Z", which now yields "no match" instead of "partial match". In the
311        case of pcre_dfa_exec(), "no match" is given if every matching path for the
312        final character ended with (*FAIL).
313    
314    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
315        if the pattern had a "must contain" character that was already found in the
316        earlier partial match, unless partial matching was again requested. For
317        example, with the pattern /dog.(body)?/, the "must contain" character is
318        "g". If the first part-match was for the string "dog", restarting with
319        "sbody" failed. This bug has been fixed.
320    
321    13. The string returned by pcre_dfa_exec() after a partial match has been
322        changed so that it starts at the first inspected character rather than the
323        first character of the match. This makes a difference only if the pattern
324        starts with a lookbehind assertion or \b or \B (\K is not supported by
325        pcre_dfa_exec()). It's an incompatible change, but it makes the two
326        matching functions compatible, and I think it's the right thing to do.
327    
328    14. Added a pcredemo man page, created automatically from the pcredemo.c file,
329        so that the demonstration program is easily available in environments where
330        PCRE has not been installed from source.
331    
332    15. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
333        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
334        library.
335    
336    16. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
337        It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
338        is not the first non-POSIX option to be added. Clearly some people find
339        these options useful.
340    
341    17. If a caller to the POSIX matching function regexec() passes a non-zero
342        value for nmatch with a NULL value for pmatch, the value of
343        nmatch is forced to zero.
344    
345    18. RunGrepTest did not have a test for the availability of the -u option of
346        the diff command, as RunTest does. It now checks in the same way as
347        RunTest, and also checks for the -b option.
348    
349    19. If an odd number of negated classes containing just a single character
350        interposed, within parentheses, between a forward reference to a named
351        subpattern and the definition of the subpattern, compilation crashed with
352        an internal error, complaining that it could not find the referenced
353        subpattern. An example of a crashing pattern is /(?&A)(([^m])(?<A>))/.
354        [The bug was that it was starting one character too far in when skipping
355        over the character class, thus treating the ] as data rather than
356        terminating the class. This meant it could skip too much.]
357    
358    20. Added PCRE_NOTEMPTY_ATSTART in order to be able to correctly implement the
359        /g option in pcretest when the pattern contains \K, which makes it possible
360        to have an empty string match not at the start, even when the pattern is
361        anchored. Updated pcretest and pcredemo to use this option.
362    
363    21. If the maximum number of capturing subpatterns in a recursion was greater
364        than the maximum at the outer level, the higher number was returned, but
365        with unset values at the outer level. The correct (outer level) value is
366        now given.
367    
368    22. If (*ACCEPT) appeared inside capturing parentheses, previous releases of
369        PCRE did not set those parentheses (unlike Perl). I have now found a way to
370        make it do so. The string so far is captured, making this feature
371        compatible with Perl.
372    
373    23. The tests have been re-organized, adding tests 11 and 12, to make it
374        possible to check the Perl 5.10 features against Perl 5.10.
375    
376    24. Perl 5.10 allows subroutine calls in lookbehinds, as long as the subroutine
377        pattern matches a fixed length string. PCRE did not allow this; now it
378        does. Neither allows recursion.
379    
380    25. I finally figured out how to implement a request to provide the minimum
381        length of subject string that was needed in order to match a given pattern.
382        (It was back references and recursion that I had previously got hung up
383        on.) This code has now been added to pcre_study(); it finds a lower bound
384        to the length of subject needed. It is not necessarily the greatest lower
385        bound, but using it to avoid searching strings that are too short does give
386        some useful speed-ups. The value is available to calling programs via
387        pcre_fullinfo().
388    
389    26. While implementing 25, I discovered to my embarrassment that pcretest had
390        not been passing the result of pcre_study() to pcre_dfa_exec(), so the
391        study optimizations had never been tested with that matching function.
392        Oops. What is worse, even when it was passed study data, there was a bug in
393        pcre_dfa_exec() that meant it never actually used it. Double oops. There
394        were also very few tests of studied patterns with pcre_dfa_exec().
395    
396    27. If (?| is used to create subpatterns with duplicate numbers, they are now
397        allowed to have the same name, even if PCRE_DUPNAMES is not set. However,
398        on the other side of the coin, they are no longer allowed to have different
399        names, because these cannot be distinguished in PCRE, and this has caused
400        confusion. (This is a difference from Perl.)
401    
402    28. When duplicate subpattern names are present (necessarily with different
403        numbers, as required by 27 above), and a test is made by name in a
404        conditional pattern, either for a subpattern having been matched, or for
405        recursion in such a pattern, all the associated numbered subpatterns are
406        tested, and the overall condition is true if the condition is true for any
407        one of them. This is the way Perl works, and is also more like the way
408        testing by number works.
409    
410    
411    Version 7.9 11-Apr-09
412    ---------------------
413    
414    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
415        (pcretest), all targets were linked against these libraries. This included
416        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
417        libraries. This caused unwanted dependencies to be created. This problem
418        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
419        pcretest is linked with readline.
420    
421    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
422        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
423        moved outside it again, because FALSE and TRUE are already defined in AIX,
424        but BOOL is not.
425    
426    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
427        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
428    
429    4.  The pcregrep documentation said spaces were inserted as well as colons (or
430        hyphens) following file names and line numbers when outputting matching
431        lines. This is not true; no spaces are inserted. I have also clarified the
432        wording for the --colour (or --color) option.
433    
434    5.  In pcregrep, when --colour was used with -o, the list of matching strings
435        was not coloured; this is different to GNU grep, so I have changed it to be
436        the same.
437    
438    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
439        each matching line was coloured. Now it goes on to look for further matches
440        of any of the test patterns, which is the same behaviour as GNU grep.
441    
442    7.  A pattern that could match an empty string could cause pcregrep to loop; it
443        doesn't make sense to accept an empty string match in pcregrep, so I have
444        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
445        seems to be how GNU grep behaves.
446    
447    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
448        start or after a newline", because the conditional assertion was not being
449        correctly handled. The rule now is that both the assertion and what follows
450        in the first alternative must satisfy the test.
451    
452    9.  If auto-callout was enabled in a pattern with a conditional group whose
453        condition was an assertion, PCRE could crash during matching, both with
454        pcre_exec() and pcre_dfa_exec().
455    
456    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
457        used for matching.
458    
459    11. Unicode property support in character classes was not working for
460        characters (bytes) greater than 127 when not in UTF-8 mode.
461    
462    12. Added the -M command line option to pcretest.
463    
464    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
465    
466    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
467    
468    16. Added comments and documentation about mis-use of no_arg in the C++
469        wrapper.
470    
471    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
472        from Martin Jerabek that uses macro names for all relevant character and
473        string constants.
474    
475    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
476        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
477        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
478        these, but not everybody uses configure.
479    
480    19. A conditional group that had only one branch was not being correctly
481        recognized as an item that could match an empty string. This meant that an
482        enclosing group might also not be so recognized, causing infinite looping
483        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
484        with the subject "ab", where knowledge that the repeated group can match
485        nothing is needed in order to break the loop.
486    
487    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
488        exec(), but without supplying a callout function, matching went wrong.
489    
490    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
491        leak if the size of the offset vector was greater than 30. When the vector
492        is smaller, the saved offsets during recursion go onto a local stack
493        vector, but for larger vectors malloc() is used. It was failing to free
494        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
495        error, in fact).
496    
497    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
498        heapframe that is used only when UTF-8 support is enabled. This caused no
499        problem, but was untidy.
500    
501    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
502        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
503        included within another project.
504    
505    24. Steven Van Ingelgem's patches to add more options to the CMake support,
506        slightly modified by me:
507    
508          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
509              not building pcregrep.
510    
511          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
512              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
513    
514    25. Forward references, both numeric and by name, in patterns that made use of
515        duplicate group numbers, could behave incorrectly or give incorrect errors,
516        because when scanning forward to find the reference group, PCRE was not
517        taking into account the duplicate group numbers. A pattern such as
518        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
519    
520    26. Changed a few more instances of "const unsigned char *" to USPTR, making
521        the feature of a custom pointer more persuasive (as requested by a user).
522    
523    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
524        pcretest.c, inside #ifndefs, because it seems they are sometimes already
525        pre-defined.
526    
527    28. Added support for (*UTF8) at the start of a pattern.
528    
529    29. Arrange for flags added by the "release type" setting in CMake to be shown
530        in the configuration summary.
531    
532    
533    Version 7.8 05-Sep-08
534    ---------------------
535    
536    1.  Replaced UCP searching code with optimized version as implemented for Ad
537        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
538        stage table and inline lookup instead of a function, giving speed ups of 2
539        to 5 times on some simple patterns that I tested. Permission was given to
540        distribute the MultiStage2.py script that generates the tables (it's not in
541        the tarball, but is in the Subversion repository).
542    
543    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
544        scripts.
545    
546    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
547        a group with a zero qualifier. The result of the study could be incorrect,
548        or the function might crash, depending on the pattern.
549    
550    4.  Caseless matching was not working for non-ASCII characters in back
551        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
552        It now works when Unicode Property Support is available.
553    
554    5.  In pcretest, an escape such as \x{de} in the data was always generating
555        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
556        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
557        truncation.
558    
559    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
560    
561    7.  Added two (int) casts to pcregrep when printing the difference of two
562        pointers, in case they are 64-bit values.
563    
564    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
565        test 2 if it fails.
566    
567    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
568        and a #define of that name to empty if it is not externally set. This is to
569        allow users of MSVC to set it if necessary.
570    
571    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
572        the convenience functions in the pcre_get.c source file.
573    
574    11. An option change at the start of a pattern that had top-level alternatives
575        could cause overwriting and/or a crash. This command provoked a crash in
576        some environments:
577    
578          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
579    
580        This potential security problem was recorded as CVE-2008-2371.
581    
582    12. For a pattern where the match had to start at the beginning or immediately
583        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
584        pcre_dfa_exec() could read past the end of the passed subject if there was
585        no match. To help with detecting such bugs (e.g. with valgrind), I modified
586        pcretest so that it places the subject at the end of its malloc-ed buffer.
587    
588    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
589        exec() might read past the end of the data buffer in UTF-8 mode.
590    
591    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
592        the data contained the byte 0x85 as part of a UTF-8 character within its
593        first line. This applied both to normal and DFA matching.
594    
595    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
596        /^[^d]*?$/8 failed to match "abc".
597    
598    16. Added a missing copyright notice to pcrecpp_internal.h.
599    
600    17. Make it more clear in the documentation that values returned from
601        pcre_exec() in ovector are byte offsets, not character counts.
602    
603    18. Tidied a few places to stop certain compilers from issuing warnings.
604    
605    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
606        supplied by Stefan Weber. I made a further small update for 7.8 because
607        there is a change of source arrangements: the pcre_searchfuncs.c module is
608        replaced by pcre_ucd.c.
609    
610    
611    Version 7.7 07-May-08
612    ---------------------
613    
614    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
615        a string to a long long, pretend we don't even have a long long." This is
616        done by checking for the strtoq, strtoll, and _strtoi64 functions.
617    
618    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
619        pre-7.6 versions, which defined a global no_arg variable instead of putting
620        it in the RE class. (See also #8 below.)
621    
622    3.  Remove a line of dead code, identified by coverity and reported by Nuno
623        Lopes.
624    
625    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
626    
627        (1) The include/exclude patterns were being applied to the whole pathnames
628            of files, instead of just to the final components.
629    
630        (2) If there was more than one level of directory, the subdirectories were
631            skipped unless they satisfied the include/exclude conditions. This is
632            inconsistent with GNU grep (and could even be seen as contrary to the
633            pcregrep specification - which I improved to make it absolutely clear).
634            The action now is always to scan all levels of directory, and just
635            apply the include/exclude patterns to regular files.
636    
637    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
638        --exclude_dir in the tests to avoid scanning .svn directories.
639    
640    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
641        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
642        doesn't support NULs in patterns.
643    
644    7.  Added some missing "const"s to declarations of static tables in
645        pcre_compile.c and pcre_dfa_exec.c.
646    
647    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
648        caused by fix #2  above. (Subsequently also a second patch to fix the
649        first patch. And a third patch - this was a messy problem.)
650    
651    9.  Applied Craig's patch to remove the use of push_back().
652    
653    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
654        matching function regexec().
655    
656    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
657        which, however, unlike Perl's \g{...}, are subroutine calls, not back
658        references. PCRE supports relative numbers with this syntax (I don't think
659        Oniguruma does).
660    
661    12. Previously, a group with a zero repeat such as (...){0} was completely
662        omitted from the compiled regex. However, this means that if the group
663        was called as a subroutine from elsewhere in the pattern, things went wrong
664        (an internal error was given). Such groups are now left in the compiled
665        pattern, with a new opcode that causes them to be skipped at execution
666        time.
667    
668    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
669        to the way PCRE behaves:
670    
671        (a) A lone ] character is dis-allowed (Perl treats it as data).
672    
673        (b) A back reference to an unmatched subpattern matches an empty string
674            (Perl fails the current match path).
675    
676        (c) A data ] in a character class must be notated as \] because if the
677            first data character in a class is ], it defines an empty class. (In
678            Perl it is not possible to have an empty class.) The empty class []
679            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
680            The negative empty class [^] matches any one character, independently
681            of the DOTALL setting.
682    
683    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
684        non-existent subpattern following a character class starting with ']' and
685        containing () gave an internal compiling error instead of "reference to
686        non-existent subpattern". Fortunately, when the pattern did exist, the
687        compiled code was correct. (When scanning forwards to check for the
688        existencd of the subpattern, it was treating the data ']' as terminating
689        the class, so got the count wrong. When actually compiling, the reference
690        was subsequently set up correctly.)
691    
692    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
693        it was being rejected as not supported by pcre_dfa_exec(), even though
694        other assertions are supported. I have made pcre_dfa_exec() support
695        (*FAIL).
696    
697    16. The implementation of 13c above involved the invention of a new opcode,
698        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
699        cannot be changed at match time, I realized I could make a small
700        improvement to matching performance by compiling OP_ALLANY instead of
701        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
702        on the OP_ANY path.
703    
704    17. Compiling pcretest on Windows with readline support failed without the
705        following two fixes: (1) Make the unistd.h include conditional on
706        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
707    
708    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
709        ncurses library to be included for pcretest when ReadLine support is
710        requested, but also to allow for it to be overridden. This patch came from
711        Daniel Bergström.
712    
713    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
714        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
715        any errors with the current Unicode tables. Thanks to Peter Kankowski for
716        spotting this.
717    
718    
719    Version 7.6 28-Jan-08
720    ---------------------
721    
722    1.  A character class containing a very large number of characters with
723        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
724        overflow.
725    
726    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
727        HAVE_LONG_LONG is not defined.
728    
729    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
730        bring them up to date and include new features. This patch includes:
731    
732        - Fixed PH's badly added libz and libbz2 support.
733        - Fixed a problem with static linking.
734        - Added pcredemo. [But later removed - see 7 below.]
735        - Fixed dftables problem and added an option.
736        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
737            HAVE_LONG_LONG.
738        - Added readline support for pcretest.
739        - Added an listing of the option settings after cmake has run.
740    
741    4.  A user submitted a patch to Makefile that makes it easy to create
742        "pcre.dll" under mingw when using Configure/Make. I added stuff to
743        Makefile.am that cause it to include this special target, without
744        affecting anything else. Note that the same mingw target plus all
745        the other distribution libraries and programs are now supported
746        when configuring with CMake (see 6 below) instead of with
747        Configure/Make.
748    
749    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
750        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
751        exported in the Windows port". It has not yet been confirmed that the patch
752        solves the problem, but it does no harm.
753    
754    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
755        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
756        with CMake, and also correct the comment about stack recursion.
757    
758    7.  Remove the automatic building of pcredemo from the ./configure system and
759        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
760        of a program that users should build themselves after PCRE is installed, so
761        building it automatically is not really right. What is more, it gave
762        trouble in some build environments.
763    
764    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
765    
766    
767    Version 7.5 10-Jan-08
768    ---------------------
769    
770    1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
771        values in parens when parsing an RE using the C++ wrapper."
772    
773    2.  Negative specials like \S did not work in character classes in UTF-8 mode.
774        Characters greater than 255 were excluded from the class instead of being
775        included.
776    
777    3.  The same bug as (2) above applied to negated POSIX classes such as
778        [:^space:].
779    
780    4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
781        defined or documented. It seems to have been a typo for PCRE_STATIC, so
782        I have changed it.
783    
784    5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
785        first named subpattern) and a construct such as (?&a) would reference the
786        first named subpattern whose name started with "a" (in other words, the
787        length check was missing). Both these problems are fixed. "Subpattern name
788        expected" is now given for (?&) (a zero-length name), and this patch also
789        makes it give the same error for \k'' (previously it complained that that
790        was a reference to a non-existent subpattern).
791    
792    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
793        this is right because (?- can be followed by option settings as well as by
794        digits. I have, however, made the messages clearer.
795    
796    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
797        than the number used in the conditional) now cause a compile-time error.
798        This is actually not compatible with Perl, which accepts such patterns, but
799        treats the conditional as always being FALSE (as PCRE used to), but it
800        seems to me that giving a diagnostic is better.
801    
802    8.  Change "alphameric" to the more common word "alphanumeric" in comments
803        and messages.
804    
805    9.  Fix two occurrences of "backslash" in comments that should have been
806        "backspace".
807    
808    10. Remove two redundant lines of code that can never be obeyed (their function
809        was moved elsewhere).
810    
811    11. The program that makes PCRE's Unicode character property table had a bug
812        which caused it to generate incorrect table entries for sequences of
813        characters that have the same character type, but are in different scripts.
814        It amalgamated them into a single range, with the script of the first of
815        them. In other words, some characters were in the wrong script. There were
816        thirteen such cases, affecting characters in the following ranges:
817    
818          U+002b0 - U+002c1
819          U+0060c - U+0060d
820          U+0061e - U+00612
821          U+0064b - U+0065e
822          U+0074d - U+0076d
823          U+01800 - U+01805
824          U+01d00 - U+01d77
825          U+01d9b - U+01dbf
826          U+0200b - U+0200f
827          U+030fc - U+030fe
828          U+03260 - U+0327f
829          U+0fb46 - U+0fbb1
830          U+10450 - U+1049d
831    
832    12. The -o option (show only the matching part of a line) for pcregrep was not
833        compatible with GNU grep in that, if there was more than one match in a
834        line, it showed only the first of them. It now behaves in the same way as
835        GNU grep.
836    
837    13. If the -o and -v options were combined for pcregrep, it printed a blank
838        line for every non-matching line. GNU grep prints nothing, and pcregrep now
839        does the same. The return code can be used to tell if there were any
840        non-matching lines.
841    
842    14. Added --file-offsets and --line-offsets to pcregrep.
843    
844    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
845        infinitely looping recursion. The bug was that positive lookaheads were not
846        being skipped when checking for a possible empty match (negative lookaheads
847        and both kinds of lookbehind were skipped).
848    
849    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
850        inclusion of <windows.h> to before rather than after the definition of
851        INVALID_FILE_ATTRIBUTES (patch from David Byron).
852    
853    17. Specifying a possessive quantifier with a specific limit for a Unicode
854        character property caused pcre_compile() to compile bad code, which led at
855        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
856        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
857        caused the error; without that there was no problem.
858    
859    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
860    
861    19. Added --enable-pcretest-libreadline.
862    
863    20. In pcrecpp.cc, the variable 'count' was incremented twice in
864        RE::GlobalReplace(). As a result, the number of replacements returned was
865        double what it should be. I removed one of the increments, but Craig sent a
866        later patch that removed the other one (the right fix) and added unit tests
867        that check the return values (which was not done before).
868    
869    21. Several CMake things:
870    
871        (1) Arranged that, when cmake is used on Unix, the libraries end up with
872            the names libpcre and libpcreposix, not just pcre and pcreposix.
873    
874        (2) The above change means that pcretest and pcregrep are now correctly
875            linked with the newly-built libraries, not previously installed ones.
876    
877        (3) Added PCRE_SUPPORT_LIBREADLINE, PCRE_SUPPORT_LIBZ, PCRE_SUPPORT_LIBBZ2.
878    
879    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
880        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
881        UTF-8 newline character). The key issue is that the pattern starts .*;
882        this means that the match must be either at the beginning, or after a
883        newline. The bug was in the code for advancing after a failed match and
884        checking that the new position followed a newline. It was not taking
885        account of UTF-8 characters correctly.
886    
887    23. PCRE was behaving differently from Perl in the way it recognized POSIX
888        character classes. PCRE was not treating the sequence [:...:] as a
889        character class unless the ... were all letters. Perl, however, seems to
890        allow any characters between [: and :], though of course it rejects as
891        unknown any "names" that contain non-letters, because all the known class
892        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
893        for example, whereas PCRE did not - it did not recognize a POSIX character
894        class. This seemed a bit dangerous, so the code has been changed to be
895        closer to Perl. The behaviour is not identical to Perl, because PCRE will
896        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
897        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
898        Perl does, and where it didn't before.
899    
900    24. Rewrite so as to remove the single use of %n from pcregrep because in some
901        Windows environments %n is disabled by default.
902    
903    
904    Version 7.4 21-Sep-07
905    ---------------------
906    
907    1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This
908        means that a class such as [\s] counted as "explicit reference to CR or
909        LF". That isn't really right - the whole point of the change was to try to
910        help when there was an actual mention of one of the two characters. So now
911        the change happens only if \r or \n (or a literal CR or LF) character is
912        encountered.
913    
914    2.  The 32-bit options word was also used for 6 internal flags, but the numbers
915        of both had grown to the point where there were only 3 bits left.
916        Fortunately, there was spare space in the data structure, and so I have
917        moved the internal flags into a new 16-bit field to free up more option
918        bits.
919    
920    3.  The appearance of (?J) at the start of a pattern set the DUPNAMES option,
921        but did not set the internal JCHANGED flag - either of these is enough to
922        control the way the "get" function works - but the PCRE_INFO_JCHANGED
923        facility is supposed to tell if (?J) was ever used, so now (?J) at the
924        start sets both bits.
925    
926    4.  Added options (at build time, compile time, exec time) to change \R from
927        matching any Unicode line ending sequence to just matching CR, LF, or CRLF.
928    
929    5.  doc/pcresyntax.html was missing from the distribution.
930    
931    6.  Put back the definition of PCRE_ERROR_NULLWSLIMIT, for backward
932        compatibility, even though it is no longer used.
933    
934    7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and
935        strtoull to pcrecpp.cc to select the available functions in WIN32 when the
936        windows.h file is present (where different names are used). [This was
937        reversed later after testing - see 16 below.]
938    
939    8.  Changed all #include <config.h> to #include "config.h". There were also
940        some further <pcre.h> cases that I changed to "pcre.h".
941    
942    9.  When pcregrep was used with the --colour option, it missed the line ending
943        sequence off the lines that it output.
944    
945    10. It was pointed out to me that arrays of string pointers cause lots of
946        relocations when a shared library is dynamically loaded. A technique of
947        using a single long string with a table of offsets can drastically reduce
948        these. I have refactored PCRE in four places to do this. The result is
949        dramatic:
950    
951          Originally:                          290
952          After changing UCP table:            187
953          After changing error message table:   43
954          After changing table of "verbs"       36
955          After changing table of Posix names   22
956    
957        Thanks to the folks working on Gregex for glib for this insight.
958    
959    11. --disable-stack-for-recursion caused compiling to fail unless -enable-
960        unicode-properties was also set.
961    
962    12. Updated the tests so that they work when \R is defaulted to ANYCRLF.
963    
964    13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously
965        checked only for CRLF.
966    
967    14. Added casts to pcretest.c to avoid compiler warnings.
968    
969    15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
970    
971    16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
972        and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
973        entirely. This removes changes made in 7 above.
974    
975    17. The CMake files have been updated, and there is now more information about
976        building with CMake in the NON-UNIX-USE document.
977    
978    
979    Version 7.3 28-Aug-07
980    ---------------------
981    
982     1. In the rejigging of the build system that eventually resulted in 7.1, the
983        line "#include <pcre.h>" was included in pcre_internal.h. The use of angle
984        brackets there is not right, since it causes compilers to look for an
985        installed pcre.h, not the version that is in the source that is being
986        compiled (which of course may be different). I have changed it back to:
987    
988          #include "pcre.h"
989    
990        I have a vague recollection that the change was concerned with compiling in
991        different directories, but in the new build system, that is taken care of
992        by the VPATH setting the Makefile.
993    
994     2. The pattern .*$ when run in not-DOTALL UTF-8 mode with newline=any failed
995        when the subject happened to end in the byte 0x85 (e.g. if the last
996        character was \x{1ec5}). *Character* 0x85 is one of the "any" newline
997        characters but of course it shouldn't be taken as a newline when it is part
998        of another character. The bug was that, for an unlimited repeat of . in
999        not-DOTALL UTF-8 mode, PCRE was advancing by bytes rather than by
1000        characters when looking for a newline.
1001    
1002     3. A small performance improvement in the DOTALL UTF-8 mode .* case.
1003    
1004     4. Debugging: adjusted the names of opcodes for different kinds of parentheses
1005        in debug output.
1006    
1007     5. Arrange to use "%I64d" instead of "%lld" and "%I64u" instead of "%llu" for
1008        long printing in the pcrecpp unittest when running under MinGW.
1009    
1010     6. ESC_K was left out of the EBCDIC table.
1011    
1012     7. Change 7.0/38 introduced a new limit on the number of nested non-capturing
1013        parentheses; I made it 1000, which seemed large enough. Unfortunately, the
1014        limit also applies to "virtual nesting" when a pattern is recursive, and in
1015        this case 1000 isn't so big. I have been able to remove this limit at the
1016        expense of backing off one optimization in certain circumstances. Normally,
1017        when pcre_exec() would call its internal match() function recursively and
1018        immediately return the result unconditionally, it uses a "tail recursion"
1019        feature to save stack. However, when a subpattern that can match an empty
1020        string has an unlimited repetition quantifier, it no longer makes this
1021        optimization. That gives it a stack frame in which to save the data for
1022        checking that an empty string has been matched. Previously this was taken
1023        from the 1000-entry workspace that had been reserved. So now there is no
1024        explicit limit, but more stack is used.
1025    
1026     8. Applied Daniel's patches to solve problems with the import/export magic
1027        syntax that is required for Windows, and which was going wrong for the
1028        pcreposix and pcrecpp parts of the library. These were overlooked when this
1029        problem was solved for the main library.
1030    
1031     9. There were some crude static tests to avoid integer overflow when computing
1032        the size of patterns that contain repeated groups with explicit upper
1033        limits. As the maximum quantifier is 65535, the maximum group length was
1034        set at 30,000 so that the product of these two numbers did not overflow a
1035        32-bit integer. However, it turns out that people want to use groups that
1036        are longer than 30,000 bytes (though not repeat them that many times).
1037        Change 7.0/17 (the refactoring of the way the pattern size is computed) has
1038        made it possible to implement the integer overflow checks in a much more
1039        dynamic way, which I have now done. The artificial limitation on group
1040        length has been removed - we now have only the limit on the total length of
1041        the compiled pattern, which depends on the LINK_SIZE setting.
1042    
1043    10. Fixed a bug in the documentation for get/copy named substring when
1044        duplicate names are permitted. If none of the named substrings are set, the
1045        functions return PCRE_ERROR_NOSUBSTRING (7); the doc said they returned an
1046        empty string.
1047    
1048    11. Because Perl interprets \Q...\E at a high level, and ignores orphan \E
1049        instances, patterns such as [\Q\E] or [\E] or even [^\E] cause an error,
1050        because the ] is interpreted as the first data character and the
1051        terminating ] is not found. PCRE has been made compatible with Perl in this
1052        regard. Previously, it interpreted [\Q\E] as an empty class, and [\E] could
1053        cause memory overwriting.
1054    
1055    10. Like Perl, PCRE automatically breaks an unlimited repeat after an empty
1056        string has been matched (to stop an infinite loop). It was not recognizing
1057        a conditional subpattern that could match an empty string if that
1058        subpattern was within another subpattern. For example, it looped when
1059        trying to match  (((?(1)X|))*)  but it was OK with  ((?(1)X|)*)  where the
1060        condition was not nested. This bug has been fixed.
1061    
1062    12. A pattern like \X?\d or \P{L}?\d in non-UTF-8 mode could cause a backtrack
1063        past the start of the subject in the presence of bytes with the top bit
1064        set, for example "\x8aBCD".
1065    
1066    13. Added Perl 5.10 experimental backtracking controls (*FAIL), (*F), (*PRUNE),
1067        (*SKIP), (*THEN), (*COMMIT), and (*ACCEPT).
1068    
1069    14. Optimized (?!) to (*FAIL).
1070    
1071    15. Updated the test for a valid UTF-8 string to conform to the later RFC 3629.
1072        This restricts code points to be within the range 0 to 0x10FFFF, excluding
1073        the "low surrogate" sequence 0xD800 to 0xDFFF. Previously, PCRE allowed the
1074        full range 0 to 0x7FFFFFFF, as defined by RFC 2279. Internally, it still
1075        does: it's just the validity check that is more restrictive.
1076    
1077    16. Inserted checks for integer overflows during escape sequence (backslash)
1078        processing, and also fixed erroneous offset values for syntax errors during
1079        backslash processing.
1080    
1081    17. Fixed another case of looking too far back in non-UTF-8 mode (cf 12 above)
1082        for patterns like [\PPP\x8a]{1,}\x80 with the subject "A\x80".
1083    
1084    18. An unterminated class in a pattern like (?1)\c[ with a "forward reference"
1085        caused an overrun.
1086    
1087    19. A pattern like (?:[\PPa*]*){8,} which had an "extended class" (one with
1088        something other than just ASCII characters) inside a group that had an
1089        unlimited repeat caused a loop at compile time (while checking to see
1090        whether the group could match an empty string).
1091    
1092    20. Debugging a pattern containing \p or \P could cause a crash. For example,
1093        [\P{Any}] did so. (Error in the code for printing property names.)
1094    
1095    21. An orphan \E inside a character class could cause a crash.
1096    
1097    22. A repeated capturing bracket such as (A)? could cause a wild memory
1098        reference during compilation.
1099    
1100    23. There are several functions in pcre_compile() that scan along a compiled
1101        expression for various reasons (e.g. to see if it's fixed length for look
1102        behind). There were bugs in these functions when a repeated \p or \P was
1103        present in the pattern. These operators have additional parameters compared
1104        with \d, etc, and these were not being taken into account when moving along
1105        the compiled data. Specifically:
1106    
1107        (a) A item such as \p{Yi}{3} in a lookbehind was not treated as fixed
1108            length.
1109    
1110        (b) An item such as \pL+ within a repeated group could cause crashes or
1111            loops.
1112    
1113        (c) A pattern such as \p{Yi}+(\P{Yi}+)(?1) could give an incorrect
1114            "reference to non-existent subpattern" error.
1115    
1116        (d) A pattern like (\P{Yi}{2}\277)? could loop at compile time.
1117    
1118    24. A repeated \S or \W in UTF-8 mode could give wrong answers when multibyte
1119        characters were involved (for example /\S{2}/8g with "A\x{a3}BC").
1120    
1121    25. Using pcregrep in multiline, inverted mode (-Mv) caused it to loop.
1122    
1123    26. Patterns such as [\P{Yi}A] which include \p or \P and just one other
1124        character were causing crashes (broken optimization).
1125    
1126    27. Patterns such as (\P{Yi}*\277)* (group with possible zero repeat containing
1127        \p or \P) caused a compile-time loop.
1128    
1129    28. More problems have arisen in unanchored patterns when CRLF is a valid line
1130        break. For example, the unstudied pattern [\r\n]A does not match the string
1131        "\r\nA" because change 7.0/46 below moves the current point on by two
1132        characters after failing to match at the start. However, the pattern \nA
1133        *does* match, because it doesn't start till \n, and if [\r\n]A is studied,
1134        the same is true. There doesn't seem any very clean way out of this, but
1135        what I have chosen to do makes the common cases work: PCRE now takes note
1136        of whether there can be an explicit match for \r or \n anywhere in the
1137        pattern, and if so, 7.0/46 no longer applies. As part of this change,
1138        there's a new PCRE_INFO_HASCRORLF option for finding out whether a compiled
1139        pattern has explicit CR or LF references.
1140    
1141    29. Added (*CR) etc for changing newline setting at start of pattern.
1142    
1143    
1144    Version 7.2 19-Jun-07
1145    ---------------------
1146    
1147     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
1148        which is apparently normally available under Windows.
1149    
1150     2. Re-jig the pcregrep tests with different newline settings in an attempt
1151        to make them independent of the local environment's newline setting.
1152    
1153     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
1154    
1155     4. Some of the "internals" tests were previously cut out when the link size
1156        was not 2, because the output contained actual offsets. The recent new
1157        "Z" feature of pcretest means that these can be cut out, making the tests
1158        usable with all link sizes.
1159    
1160     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
1161        stack recursion. This gives a massive performance boost under BSD, but just
1162        a small improvement under Linux. However, it saves one field in the frame
1163        in all cases.
1164    
1165     6. Added more features from the forthcoming Perl 5.10:
1166    
1167        (a) (?-n) (where n is a string of digits) is a relative subroutine or
1168            recursion call. It refers to the nth most recently opened parentheses.
1169    
1170        (b) (?+n) is also a relative subroutine call; it refers to the nth next
1171            to be opened parentheses.
1172    
1173        (c) Conditions that refer to capturing parentheses can be specified
1174            relatively, for example, (?(-2)... or (?(+3)...
1175    
1176        (d) \K resets the start of the current match so that everything before
1177            is not part of it.
1178    
1179        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
1180    
1181        (f) \g{name} is another synonym - part of Perl 5.10's unification of
1182            reference syntax.
1183    
1184        (g) (?| introduces a group in which the numbering of parentheses in each
1185            alternative starts with the same number.
1186    
1187        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
1188    
1189     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
1190        PCRE_INFO_JCHANGED.
1191    
1192     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
1193        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
1194        for detecting groups that can match an empty string.
1195    
1196     9. A pattern with a very large number of alternatives (more than several
1197        hundred) was running out of internal workspace during the pre-compile
1198        phase, where pcre_compile() figures out how much memory will be needed. A
1199        bit of new cunning has reduced the workspace needed for groups with
1200        alternatives. The 1000-alternative test pattern now uses 12 bytes of
1201        workspace instead of running out of the 4096 that are available.
1202    
1203    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
1204    
1205    11. Applied patch from Google to remove an optimization that didn't quite work.
1206        The report of the bug said:
1207    
1208          pcrecpp::RE("a*").FullMatch("aaa") matches, while
1209          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
1210          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
1211    
1212    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
1213        it matched the wrong number of bytes.
1214    
1215    
1216    Version 7.1 24-Apr-07
1217  ---------------------  ---------------------
1218    
1219   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
1220      that is more "standard", making use of automake and other autotools. There      that is more "standard", making use of automake and other Autotools. There
1221      is some re-arrangement of the files and adjustment of comments consequent      is some re-arrangement of the files and adjustment of comments consequent
1222      on this.      on this.
1223    
# Line 26  Version 7.1 05-Mar-07 Line 1238  Version 7.1 05-Mar-07
1238      .br or .in.      .br or .in.
1239    
1240   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
1241      arranged for config.h to be included in the distribution, with the name      arranged for config.h to be included in the distribution, with the name
1242      config.h.generic, for the benefit of those who have to compile without      config.h.generic, for the benefit of those who have to compile without
1243      Autotools (compare pcre.h, which is now distributed as pcre.h.generic).      Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
1244    
1245   5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan   5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan
1246      Weber: (1) pcre_internal.h was missing some function renames; (2) updated      Weber: (1) pcre_internal.h was missing some function renames; (2) updated
1247      makevp.bat for the current PCRE, using the additional files !compile.txt,      makevp.bat for the current PCRE, using the additional files
1248      !linklib.txt, and pcregexp.pas.      makevp_c.txt, makevp_l.txt, and pcregexp.pas.
1249    
1250   6. A Windows user reported a minor discrepancy with test 2, which turned out   6. A Windows user reported a minor discrepancy with test 2, which turned out
1251      to be caused by a trailing space on an input line that had got lost in his      to be caused by a trailing space on an input line that had got lost in his
# Line 63  Version 7.1 05-Mar-07 Line 1275  Version 7.1 05-Mar-07
1275  10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:  10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:
1276    
1277      (a) It was defining its arguments as char * instead of void *.      (a) It was defining its arguments as char * instead of void *.
1278    
1279      (b) It was assuming that all moves were upwards in memory; this was true      (b) It was assuming that all moves were upwards in memory; this was true
1280          a long time ago when I wrote it, but is no longer the case.          a long time ago when I wrote it, but is no longer the case.
1281    
1282      The emulated memove() is provided for those environments that have neither      The emulated memove() is provided for those environments that have neither
1283      memmove() nor bcopy(). I didn't think anyone used it these days, but that      memmove() nor bcopy(). I didn't think anyone used it these days, but that
1284      is clearly not the case, as these two bugs were recently reported.      is clearly not the case, as these two bugs were recently reported.
1285    
1286  11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,  11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
1287      and Detrail to create the HTML documentation, the .txt form of the man      and Detrail to create the HTML documentation, the .txt form of the man
1288      pages, and it removes trailing spaces from listed files. It also creates      pages, and it removes trailing spaces from listed files. It also creates
1289      pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter      pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter
1290      case, it wraps all the #defines with #ifndefs. This script should be run      case, it wraps all the #defines with #ifndefs. This script should be run
1291      before "make dist".      before "make dist".
1292    
1293  12. Fixed two fairly obscure bugs concerned with quantified caseless matching  12. Fixed two fairly obscure bugs concerned with quantified caseless matching
1294      with Unicode property support.      with Unicode property support.
1295    
1296      (a) For a maximizing quantifier, if the two different cases of the      (a) For a maximizing quantifier, if the two different cases of the
1297          character were of different lengths in their UTF-8 codings (there are          character were of different lengths in their UTF-8 codings (there are
1298          some cases like this - I found 11), and the matching function had to          some cases like this - I found 11), and the matching function had to
1299          back up over a mixture of the two cases, it incorrectly assumed they          back up over a mixture of the two cases, it incorrectly assumed they
1300          were both the same length.          were both the same length.
1301    
1302      (b) When PCRE was configured to use the heap rather than the stack for      (b) When PCRE was configured to use the heap rather than the stack for
1303          recursion during matching, it was not correctly preserving the data for          recursion during matching, it was not correctly preserving the data for
1304          the other case of a UTF-8 character when checking ahead for a match          the other case of a UTF-8 character when checking ahead for a match
1305          while processing a minimizing repeat. If the check also involved          while processing a minimizing repeat. If the check also involved
1306          matching a wide character, but failed, corruption could cause an          matching a wide character, but failed, corruption could cause an
1307          erroneous result when trying to check for a repeat of the original          erroneous result when trying to check for a repeat of the original
1308          character.          character.
1309    
1310  13. Some tidying changes to the testing mechanism:  13. Some tidying changes to the testing mechanism:
1311    
1312      (a) The RunTest script now detects the internal link size and whether there      (a) The RunTest script now detects the internal link size and whether there
1313          is UTF-8 and UCP support by running ./pcretest -C instead of relying on          is UTF-8 and UCP support by running ./pcretest -C instead of relying on
1314          values substituted by "configure". (The RunGrepTest script already did          values substituted by "configure". (The RunGrepTest script already did
1315          this for UTF-8.) The configure.ac script no longer substitutes the          this for UTF-8.) The configure.ac script no longer substitutes the
1316          relevant variables.          relevant variables.
1317    
1318      (b) The debugging options /B and /D in pcretest show the compiled bytecode      (b) The debugging options /B and /D in pcretest show the compiled bytecode
1319          with length and offset values. This means that the output is different          with length and offset values. This means that the output is different
1320          for different internal link sizes. Test 2 is skipped for link sizes          for different internal link sizes. Test 2 is skipped for link sizes
1321          other than 2 because of this, bypassing the problem. Unfortunately,          other than 2 because of this, bypassing the problem. Unfortunately,
1322          there was also a test in test 3 (the locale tests) that used /B and          there was also a test in test 3 (the locale tests) that used /B and
1323          failed for link sizes other than 2. Rather than cut the whole test out,          failed for link sizes other than 2. Rather than cut the whole test out,
1324          I have added a new /Z option to pcretest that replaces the length and          I have added a new /Z option to pcretest that replaces the length and
1325          offset values with spaces. This is now used to make test 3 independent          offset values with spaces. This is now used to make test 3 independent
1326          of link size.          of link size. (Test 2 will be tidied up later.)
1327    
1328    14. If erroroffset was passed as NULL to pcre_compile, it provoked a
1329        segmentation fault instead of returning the appropriate error message.
1330    
1331    15. In multiline mode when the newline sequence was set to "any", the pattern
1332        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
1333        This doesn't seem right; it now treats the CRLF combination as the line
1334        ending, and so does not match in that case. It's only a pattern such as ^$
1335        that would hit this one: something like ^ABC$ would have failed after \r
1336        and then tried again after \r\n.
1337    
1338    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
1339        in an attempt to make files that differ only in their line terminators
1340        compare equal. This works on Linux.
1341    
1342    17. Under certain error circumstances pcregrep might try to free random memory
1343        as it exited. This is now fixed, thanks to valgrind.
1344    
1345    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
1346        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
1347        was because its rules for how to advance for /g after matching an empty
1348        string at the end of a line did not allow for this case. They now check for
1349        it specially.
1350    
1351    20. pcretest is supposed to handle patterns and data of any length, by
1352        extending its buffers when necessary. It was getting this wrong when the
1353        buffer for a data line had to be extended.
1354    
1355    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
1356        CRLF as a newline sequence.
1357    
1358    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
1359        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
1360        I have nevertheless tidied it up.
1361    
1362    23. Added some casts to kill warnings from HP-UX ia64 compiler.
1363    
1364    24. Added a man page for pcre-config.
1365    
1366    
1367  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06
1368  ---------------------  ---------------------

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