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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.9 xx-xxx-09  Version 8.11 10-Oct-2010
5    ------------------------
6    
7    1.  (*THEN) was not working properly if there were untried alternatives prior
8        to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
9        backtracked to try for "b" instead of moving to the next alternative branch
10        at the same level (in this case, to look for "c"). The Perl documentation
11        is clear that when (*THEN) is backtracked onto, it goes to the "next
12        alternative in the innermost enclosing group".
13    
14    2.  (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
15        such as   (A(*COMMIT)B(*THEN)C|D)  any failure after matching A should
16        result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
17        (*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
18        (*THEN).
19    
20    3.  If \s appeared in a character class, it removed the VT character from
21        the class, even if it had been included by some previous item, for example
22        in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
23        of \s, but is part of the POSIX "space" class.)
24    
25    4.  A partial match never returns an empty string (because you can always
26        match an empty string at the end of the subject); however the checking for
27        an empty string was starting at the "start of match" point. This has been
28        changed to the "earliest inspected character" point, because the returned
29        data for a partial match starts at this character. This means that, for
30        example, /(?<=abc)def/ gives a partial match for the subject "abc"
31        (previously it gave "no match").
32    
33    5.  Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
34        of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
35        previously a full match would be given. However, setting PCRE_PARTIAL_HARD
36        has an implication that the given string is incomplete (because a partial
37        match is preferred over a full match). For this reason, these items now
38        give a partial match in this situation. [Aside: previously, the one case
39        /t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
40        match rather than a full match, which was wrong by the old rules, but is
41        now correct.]
42    
43    6.  There was a bug in the handling of #-introduced comments, recognized when
44        PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
45        If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
46        UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
47        scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
48        but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
49        places in pcre_compile().
50    
51    7.  Related to (6) above, when pcre_compile() was skipping #-introduced
52        comments when looking ahead for named forward references to subpatterns,
53        the only newline sequence it recognized was NL. It now handles newlines
54        according to the set newline convention.
55    
56    8.  SunOS4 doesn't have strerror() or strtoul(); pcregrep dealt with the
57        former, but used strtoul(), whereas pcretest avoided strtoul() but did not
58        cater for a lack of strerror(). These oversights have been fixed.
59    
60    9.  Added --match-limit and --recursion-limit to pcregrep.
61    
62    10. Added two casts needed to build with Visual Studio when NO_RECURSE is set.
63    
64    11. When the -o option was used, pcregrep was setting a return code of 1, even
65        when matches were found, and --line-buffered was not being honoured.
66    
67    
68    Version 8.10 25-Jun-2010
69    ------------------------
70    
71    1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
72        THEN.
73    
74    2.  (*ACCEPT) was not working when inside an atomic group.
75    
76    3.  Inside a character class, \B is treated as a literal by default, but
77        faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
78        causes the error). The code is unchanged, but I tidied the documentation.
79    
80    4.  Inside a character class, PCRE always treated \R and \X as literals,
81        whereas Perl faults them if its -w option is set. I have changed PCRE so
82        that it faults them when PCRE_EXTRA is set.
83    
84    5.  Added support for \N, which always matches any character other than
85        newline. (It is the same as "." when PCRE_DOTALL is not set.)
86    
87    6.  When compiling pcregrep with newer versions of gcc which may have
88        FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
89        declared with attribute warn_unused_result" were given. Just casting the
90        result to (void) does not stop the warnings; a more elaborate fudge is
91        needed. I've used a macro to implement this.
92    
93    7.  Minor change to pcretest.c to avoid a compiler warning.
94    
95    8.  Added four artifical Unicode properties to help with an option to make
96        \s etc use properties (see next item). The new properties are: Xan
97        (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
98    
99    9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
100        use Unicode properties. (*UCP) at the start of a pattern can be used to set
101        this option. Modified pcretest to add /W to test this facility. Added
102        REG_UCP to make it available via the POSIX interface.
103    
104    10. Added --line-buffered to pcregrep.
105    
106    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
107        studied, and the match started with a letter with a code point greater than
108        127 whose first byte was different to the first byte of the other case of
109        the letter, the other case of this starting letter was not recognized
110        (#976).
111    
112    12. If a pattern that was studied started with a repeated Unicode property
113        test, for example, \p{Nd}+, there was the theoretical possibility of
114        setting up an incorrect bitmap of starting bytes, but fortunately it could
115        not have actually happened in practice until change 8 above was made (it
116        added property types that matched character-matching opcodes).
117    
118    13. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
119        possible starting bytes for non-anchored patterns.
120    
121    14. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes
122        \R, and also a number of cases that involve Unicode properties, both
123        explicit and implicit when PCRE_UCP is set.
124    
125    15. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
126        input, it could crash or give wrong results if characters with values
127        greater than 0xc0 were present in the subject string. (Detail: it assumed
128        UTF-8 input when processing these items.)
129    
130    16. Added a lot of (int) casts to avoid compiler warnings in systems where
131        size_t is 64-bit (#991).
132    
133    17. Added a check for running out of memory when PCRE is compiled with
134        --disable-stack-for-recursion (#990).
135    
136    18. If the last data line in a file for pcretest does not have a newline on
137        the end, a newline was missing in the output.
138    
139    19. The default pcre_chartables.c file recognizes only ASCII characters (values
140        less than 128) in its various bitmaps. However, there is a facility for
141        generating tables according to the current locale when PCRE is compiled. It
142        turns out that in some environments, 0x85 and 0xa0, which are Unicode space
143        characters, are recognized by isspace() and therefore were getting set in
144        these tables, and indeed these tables seem to approximate to ISO 8859. This
145        caused a problem in UTF-8 mode when pcre_study() was used to create a list
146        of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
147        which of course cannot start UTF-8 characters. I have changed the code so
148        that only real ASCII characters (less than 128) and the correct starting
149        bytes for UTF-8 encodings are set for characters greater than 127 when in
150        UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
151        altogether.)
152    
153    20. Added the /T option to pcretest so as to be able to run tests with non-
154        standard character tables, thus making it possible to include the tests
155        used for 19 above in the standard set of tests.
156    
157    21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
158        reference to a subpattern the other side of a comment that contains an
159        opening parenthesis caused either an internal compiling error, or a
160        reference to the wrong subpattern.
161    
162    
163    Version 8.02 19-Mar-2010
164    ------------------------
165    
166    1.  The Unicode data tables have been updated to Unicode 5.2.0.
167    
168    2.  Added the option --libs-cpp to pcre-config, but only when C++ support is
169        configured.
170    
171    3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the
172        original author of that file, following a query about its status.
173    
174    4.  On systems that do not have stdint.h (e.g. Solaris), check for and include
175        inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.
176    
177    5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
178        quantifier applied to a forward-referencing subroutine call, could compile
179        incorrect code or give the error "internal error: previously-checked
180        referenced subpattern not found".
181    
182    6.  Both MS Visual Studio and Symbian OS have problems with initializing
183        variables to point to external functions. For these systems, therefore,
184        pcre_malloc etc. are now initialized to local functions that call the
185        relevant global functions.
186    
187    7.  There were two entries missing in the vectors called coptable and poptable
188        in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.
189        I've fixed the data, and added a kludgy way of testing at compile time that
190        the lengths are correct (equal to the number of opcodes).
191    
192    8.  Following on from 7, I added a similar kludge to check the length of the
193        eint vector in pcreposix.c.
194    
195    9.  Error texts for pcre_compile() are held as one long string to avoid too
196        much relocation at load time. To find a text, the string is searched,
197        counting zeros. There was no check for running off the end of the string,
198        which could happen if a new error number was added without updating the
199        string.
200    
201    10. \K gave a compile-time error if it appeared in a lookbehind assersion.
202    
203    11. \K was not working if it appeared in an atomic group or in a group that
204        was called as a "subroutine", or in an assertion. Perl 5.11 documents that
205        \K is "not well defined" if used in an assertion. PCRE now accepts it if
206        the assertion is positive, but not if it is negative.
207    
208    12. Change 11 fortuitously reduced the size of the stack frame used in the
209        "match()" function of pcre_exec.c by one pointer. Forthcoming
210        implementation of support for (*MARK) will need an extra pointer on the
211        stack; I have reserved it now, so that the stack frame size does not
212        decrease.
213    
214    13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other
215        item in branch that calls a recursion is a subroutine call - as in the
216        second branch in the above example - was incorrectly given the compile-
217        time error "recursive call could loop indefinitely" because pcre_compile()
218        was not correctly checking the subroutine for matching a non-empty string.
219    
220    14. The checks for overrunning compiling workspace could trigger after an
221        overrun had occurred. This is a "should never occur" error, but it can be
222        triggered by pathological patterns such as hundreds of nested parentheses.
223        The checks now trigger 100 bytes before the end of the workspace.
224    
225    15. Fix typo in configure.ac: "srtoq" should be "strtoq".
226    
227    
228    Version 8.01 19-Jan-2010
229    ------------------------
230    
231    1.  If a pattern contained a conditional subpattern with only one branch (in
232        particular, this includes all (*DEFINE) patterns), a call to pcre_study()
233        computed the wrong minimum data length (which is of course zero for such
234        subpatterns). This could cause incorrect "no match" results.
235    
236    2.  For patterns such as (?i)a(?-i)b|c where an option setting at the start of
237        the pattern is reset in the first branch, pcre_compile() failed with
238        "internal error: code overflow at offset...". This happened only when
239        the reset was to the original external option setting. (An optimization
240        abstracts leading options settings into an external setting, which was the
241        cause of this.)
242    
243    3.  A pattern such as ^(?!a(*SKIP)b) where a negative assertion contained one
244        of the verbs SKIP, PRUNE, or COMMIT, did not work correctly. When the
245        assertion pattern did not match (meaning that the assertion was true), it
246        was incorrectly treated as false if the SKIP had been reached during the
247        matching. This also applied to assertions used as conditions.
248    
249    4.  If an item that is not supported by pcre_dfa_exec() was encountered in an
250        assertion subpattern, including such a pattern used as a condition,
251        unpredictable results occurred, instead of the error return
252        PCRE_ERROR_DFA_UITEM.
253    
254    5.  The C++ GlobalReplace function was not working like Perl for the special
255        situation when an empty string is matched. It now does the fancy magic
256        stuff that is necessary.
257    
258    6.  In pcre_internal.h, obsolete includes to setjmp.h and stdarg.h have been
259        removed. (These were left over from very, very early versions of PCRE.)
260    
261    7.  Some cosmetic changes to the code to make life easier when compiling it
262        as part of something else:
263    
264        (a) Change DEBUG to PCRE_DEBUG.
265    
266        (b) In pcre_compile(), rename the member of the "branch_chain" structure
267            called "current" as "current_branch", to prevent a collision with the
268            Linux macro when compiled as a kernel module.
269    
270        (c) In pcre_study(), rename the function set_bit() as set_table_bit(), to
271            prevent a collision with the Linux macro when compiled as a kernel
272            module.
273    
274    8.  In pcre_compile() there are some checks for integer overflows that used to
275        cast potentially large values to (double). This has been changed to that
276        when building, a check for int64_t is made, and if it is found, it is used
277        instead, thus avoiding the use of floating point arithmetic. (There is no
278        other use of FP in PCRE.) If int64_t is not found, the fallback is to
279        double.
280    
281    9.  Added two casts to avoid signed/unsigned warnings from VS Studio Express
282        2005 (difference between two addresses compared to an unsigned value).
283    
284    10. Change the standard AC_CHECK_LIB test for libbz2 in configure.ac to a
285        custom one, because of the following reported problem in Windows:
286    
287          - libbz2 uses the Pascal calling convention (WINAPI) for the functions
288              under Win32.
289          - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",
290              therefore missing the function definition.
291          - The compiler thus generates a "C" signature for the test function.
292          - The linker fails to find the "C" function.
293          - PCRE fails to configure if asked to do so against libbz2.
294    
295    11. When running libtoolize from libtool-2.2.6b as part of autogen.sh, these
296        messages were output:
297    
298          Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and
299          rerunning libtoolize, to keep the correct libtool macros in-tree.
300          Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
301    
302        I have done both of these things.
303    
304    12. Although pcre_dfa_exec() does not use nearly as much stack as pcre_exec()
305        most of the time, it *can* run out if it is given a pattern that contains a
306        runaway infinite recursion. I updated the discussion in the pcrestack man
307        page.
308    
309    13. Now that we have gone to the x.xx style of version numbers, the minor
310        version may start with zero. Using 08 or 09 is a bad idea because users
311        might check the value of PCRE_MINOR in their code, and 08 or 09 may be
312        interpreted as invalid octal numbers. I've updated the previous comment in
313        configure.ac, and also added a check that gives an error if 08 or 09 are
314        used.
315    
316    14. Change 8.00/11 was not quite complete: code had been accidentally omitted,
317        causing partial matching to fail when the end of the subject matched \W
318        in a UTF-8 pattern where \W was quantified with a minimum of 3.
319    
320    15. There were some discrepancies between the declarations in pcre_internal.h
321        of _pcre_is_newline(), _pcre_was_newline(), and _pcre_valid_utf8() and
322        their definitions. The declarations used "const uschar *" and the
323        definitions used USPTR. Even though USPTR is normally defined as "const
324        unsigned char *" (and uschar is typedeffed as "unsigned char"), it was
325        reported that: "This difference in casting confuses some C++ compilers, for
326        example, SunCC recognizes above declarations as different functions and
327        generates broken code for hbpcre." I have changed the declarations to use
328        USPTR.
329    
330    16. GNU libtool is named differently on some systems. The autogen.sh script now
331        tries several variants such as glibtoolize (MacOSX) and libtoolize1x
332        (FreeBSD).
333    
334    17. Applied Craig's patch that fixes an HP aCC compile error in pcre 8.00
335        (strtoXX undefined when compiling pcrecpp.cc). The patch contains this
336        comment: "Figure out how to create a longlong from a string: strtoll and
337        equivalent. It's not enough to call AC_CHECK_FUNCS: hpux has a strtoll, for
338        instance, but it only takes 2 args instead of 3!"
339    
340    18. A subtle bug concerned with back references has been fixed by a change of
341        specification, with a corresponding code fix. A pattern such as
342        ^(xa|=?\1a)+$ which contains a back reference inside the group to which it
343        refers, was giving matches when it shouldn't. For example, xa=xaaa would
344        match that pattern. Interestingly, Perl (at least up to 5.11.3) has the
345        same bug. Such groups have to be quantified to be useful, or contained
346        inside another quantified group. (If there's no repetition, the reference
347        can never match.) The problem arises because, having left the group and
348        moved on to the rest of the pattern, a later failure that backtracks into
349        the group uses the captured value from the final iteration of the group
350        rather than the correct earlier one. I have fixed this in PCRE by forcing
351        any group that contains a reference to itself to be an atomic group; that
352        is, there cannot be any backtracking into it once it has completed. This is
353        similar to recursive and subroutine calls.
354    
355    
356    Version 8.00 19-Oct-09
357    ----------------------
358    
359    1.  The table for translating pcre_compile() error codes into POSIX error codes
360        was out-of-date, and there was no check on the pcre_compile() error code
361        being within the table. This could lead to an OK return being given in
362        error.
363    
364    2.  Changed the call to open a subject file in pcregrep from fopen(pathname,
365        "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
366        in a Windows environment.
367    
368    3.  The pcregrep --count option prints the count for each file even when it is
369        zero, as does GNU grep. However, pcregrep was also printing all files when
370        --files-with-matches was added. Now, when both options are given, it prints
371        counts only for those files that have at least one match. (GNU grep just
372        prints the file name in this circumstance, but including the count seems
373        more useful - otherwise, why use --count?) Also ensured that the
374        combination -clh just lists non-zero counts, with no names.
375    
376    4.  The long form of the pcregrep -F option was incorrectly implemented as
377        --fixed_strings instead of --fixed-strings. This is an incompatible change,
378        but it seems right to fix it, and I didn't think it was worth preserving
379        the old behaviour.
380    
381    5.  The command line items --regex=pattern and --regexp=pattern were not
382        recognized by pcregrep, which required --regex pattern or --regexp pattern
383        (with a space rather than an '='). The man page documented the '=' forms,
384        which are compatible with GNU grep; these now work.
385    
386    6.  No libpcreposix.pc file was created for pkg-config; there was just
387        libpcre.pc and libpcrecpp.pc. The omission has been rectified.
388    
389    7.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
390        when UCP support is not needed, by modifying the Python script that
391        generates it from Unicode data files. This should not matter if the module
392        is correctly used as a library, but I received one complaint about 50K of
393        unwanted data. My guess is that the person linked everything into his
394        program rather than using a library. Anyway, it does no harm.
395    
396    8.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
397        was a minimum greater than 1 for a wide character in a possessive
398        repetition. The same bug could also affect patterns like /(\x{ff}{0,2})*/8
399        which had an unlimited repeat of a nested, fixed maximum repeat of a wide
400        character. Chaos in the form of incorrect output or a compiling loop could
401        result.
402    
403    9.  The restrictions on what a pattern can contain when partial matching is
404        requested for pcre_exec() have been removed. All patterns can now be
405        partially matched by this function. In addition, if there are at least two
406        slots in the offset vector, the offset of the earliest inspected character
407        for the match and the offset of the end of the subject are set in them when
408        PCRE_ERROR_PARTIAL is returned.
409    
410    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
411        synonymous with PCRE_PARTIAL, for backwards compatibility, and
412        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
413        and may be more useful for multi-segment matching.
414    
415    11. Partial matching with pcre_exec() is now more intuitive. A partial match
416        used to be given if ever the end of the subject was reached; now it is
417        given only if matching could not proceed because another character was
418        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
419        string "Z", which now yields "no match" instead of "partial match". In the
420        case of pcre_dfa_exec(), "no match" is given if every matching path for the
421        final character ended with (*FAIL).
422    
423    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
424        if the pattern had a "must contain" character that was already found in the
425        earlier partial match, unless partial matching was again requested. For
426        example, with the pattern /dog.(body)?/, the "must contain" character is
427        "g". If the first part-match was for the string "dog", restarting with
428        "sbody" failed. This bug has been fixed.
429    
430    13. The string returned by pcre_dfa_exec() after a partial match has been
431        changed so that it starts at the first inspected character rather than the
432        first character of the match. This makes a difference only if the pattern
433        starts with a lookbehind assertion or \b or \B (\K is not supported by
434        pcre_dfa_exec()). It's an incompatible change, but it makes the two
435        matching functions compatible, and I think it's the right thing to do.
436    
437    14. Added a pcredemo man page, created automatically from the pcredemo.c file,
438        so that the demonstration program is easily available in environments where
439        PCRE has not been installed from source.
440    
441    15. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
442        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
443        library.
444    
445    16. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
446        It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
447        is not the first non-POSIX option to be added. Clearly some people find
448        these options useful.
449    
450    17. If a caller to the POSIX matching function regexec() passes a non-zero
451        value for nmatch with a NULL value for pmatch, the value of
452        nmatch is forced to zero.
453    
454    18. RunGrepTest did not have a test for the availability of the -u option of
455        the diff command, as RunTest does. It now checks in the same way as
456        RunTest, and also checks for the -b option.
457    
458    19. If an odd number of negated classes containing just a single character
459        interposed, within parentheses, between a forward reference to a named
460        subpattern and the definition of the subpattern, compilation crashed with
461        an internal error, complaining that it could not find the referenced
462        subpattern. An example of a crashing pattern is /(?&A)(([^m])(?<A>))/.
463        [The bug was that it was starting one character too far in when skipping
464        over the character class, thus treating the ] as data rather than
465        terminating the class. This meant it could skip too much.]
466    
467    20. Added PCRE_NOTEMPTY_ATSTART in order to be able to correctly implement the
468        /g option in pcretest when the pattern contains \K, which makes it possible
469        to have an empty string match not at the start, even when the pattern is
470        anchored. Updated pcretest and pcredemo to use this option.
471    
472    21. If the maximum number of capturing subpatterns in a recursion was greater
473        than the maximum at the outer level, the higher number was returned, but
474        with unset values at the outer level. The correct (outer level) value is
475        now given.
476    
477    22. If (*ACCEPT) appeared inside capturing parentheses, previous releases of
478        PCRE did not set those parentheses (unlike Perl). I have now found a way to
479        make it do so. The string so far is captured, making this feature
480        compatible with Perl.
481    
482    23. The tests have been re-organized, adding tests 11 and 12, to make it
483        possible to check the Perl 5.10 features against Perl 5.10.
484    
485    24. Perl 5.10 allows subroutine calls in lookbehinds, as long as the subroutine
486        pattern matches a fixed length string. PCRE did not allow this; now it
487        does. Neither allows recursion.
488    
489    25. I finally figured out how to implement a request to provide the minimum
490        length of subject string that was needed in order to match a given pattern.
491        (It was back references and recursion that I had previously got hung up
492        on.) This code has now been added to pcre_study(); it finds a lower bound
493        to the length of subject needed. It is not necessarily the greatest lower
494        bound, but using it to avoid searching strings that are too short does give
495        some useful speed-ups. The value is available to calling programs via
496        pcre_fullinfo().
497    
498    26. While implementing 25, I discovered to my embarrassment that pcretest had
499        not been passing the result of pcre_study() to pcre_dfa_exec(), so the
500        study optimizations had never been tested with that matching function.
501        Oops. What is worse, even when it was passed study data, there was a bug in
502        pcre_dfa_exec() that meant it never actually used it. Double oops. There
503        were also very few tests of studied patterns with pcre_dfa_exec().
504    
505    27. If (?| is used to create subpatterns with duplicate numbers, they are now
506        allowed to have the same name, even if PCRE_DUPNAMES is not set. However,
507        on the other side of the coin, they are no longer allowed to have different
508        names, because these cannot be distinguished in PCRE, and this has caused
509        confusion. (This is a difference from Perl.)
510    
511    28. When duplicate subpattern names are present (necessarily with different
512        numbers, as required by 27 above), and a test is made by name in a
513        conditional pattern, either for a subpattern having been matched, or for
514        recursion in such a pattern, all the associated numbered subpatterns are
515        tested, and the overall condition is true if the condition is true for any
516        one of them. This is the way Perl works, and is also more like the way
517        testing by number works.
518    
519    
520    Version 7.9 11-Apr-09
521  ---------------------  ---------------------
522    
523  1.  When building with support for bzlib/zlib (pcregrep) and/or readline  1.  When building with support for bzlib/zlib (pcregrep) and/or readline
524      (pcretest), all targets were linked against these libraries. This included      (pcretest), all targets were linked against these libraries. This included
525      libpcre, libpcreposix, and libpcrecpp, even though they do not use these      libpcre, libpcreposix, and libpcrecpp, even though they do not use these
526      libraries. This caused unwanted dependencies to be created. This problem      libraries. This caused unwanted dependencies to be created. This problem
527      has been fixed, and now only pcregrep is linked with bzlib/zlib and only      has been fixed, and now only pcregrep is linked with bzlib/zlib and only
528      pcretest is linked with readline.      pcretest is linked with readline.
529    
530  2.  The "typedef int BOOL" in pcre_internal.h that was included inside the  2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
531      "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been      "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
532      moved outside it again, because FALSE and TRUE are already defined in AIX,      moved outside it again, because FALSE and TRUE are already defined in AIX,
533      but BOOL is not.      but BOOL is not.
534    
535  3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and  3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
536      PCRE_MATCH_LIMIT_RETURSION values as ints, when they should be long ints.      PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
537    
538  4.  The pcregrep documentation said spaces were inserted as well as colons (or  4.  The pcregrep documentation said spaces were inserted as well as colons (or
539      hyphens) following file names and line numbers when outputting matching      hyphens) following file names and line numbers when outputting matching
540      lines. This is not true; no spaces are inserted. I have also clarified the      lines. This is not true; no spaces are inserted. I have also clarified the
541      wording for the --colour (or --color) option.      wording for the --colour (or --color) option.
542    
543  5.  In pcregrep, when --colour was used with -o, the list of matching strings  5.  In pcregrep, when --colour was used with -o, the list of matching strings
544      was not coloured; this is different to GNU grep, so I have changed it to be      was not coloured; this is different to GNU grep, so I have changed it to be
545      the same.      the same.
546    
547  6.  When --colo(u)r was used in pcregrep, only the first matching substring in  6.  When --colo(u)r was used in pcregrep, only the first matching substring in
548      each matching line was coloured. Now it goes on to look for further matches      each matching line was coloured. Now it goes on to look for further matches
549      of any of the test patterns, which is the same behaviour as GNU grep.      of any of the test patterns, which is the same behaviour as GNU grep.
550    
551  7.  A pattern that could match an empty string could cause pcregrep to loop; it  7.  A pattern that could match an empty string could cause pcregrep to loop; it
552      doesn't make sense to accept an empty string match in pcregrep, so I have      doesn't make sense to accept an empty string match in pcregrep, so I have
553      locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this      locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
554      seems to be how GNU grep behaves.      seems to be how GNU grep behaves.
555    
556  8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at  8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
557      start or after a newline", because the conditional assertion was not being      start or after a newline", because the conditional assertion was not being
558      correctly handled. The rule now is that both the assertion and what follows      correctly handled. The rule now is that both the assertion and what follows
559      in the first alternative must satisfy the test.      in the first alternative must satisfy the test.
560    
561  9.  If auto-callout was enabled in a pattern with a conditional group, PCRE  9.  If auto-callout was enabled in a pattern with a conditional group whose
562      could crash during matching.      condition was an assertion, PCRE could crash during matching, both with
563        pcre_exec() and pcre_dfa_exec().
564  10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was  
565      used for matching.  10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
566        used for matching.
567  11. Unicode property support in character classes was not working for  
568    11. Unicode property support in character classes was not working for
569      characters (bytes) greater than 127 when not in UTF-8 mode.      characters (bytes) greater than 127 when not in UTF-8 mode.
570    
571    12. Added the -M command line option to pcretest.
572    
573    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
574    
575    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
576    
577    16. Added comments and documentation about mis-use of no_arg in the C++
578        wrapper.
579    
580    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
581        from Martin Jerabek that uses macro names for all relevant character and
582        string constants.
583    
584    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
585        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
586        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
587        these, but not everybody uses configure.
588    
589    19. A conditional group that had only one branch was not being correctly
590        recognized as an item that could match an empty string. This meant that an
591        enclosing group might also not be so recognized, causing infinite looping
592        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
593        with the subject "ab", where knowledge that the repeated group can match
594        nothing is needed in order to break the loop.
595    
596    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
597        exec(), but without supplying a callout function, matching went wrong.
598    
599    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
600        leak if the size of the offset vector was greater than 30. When the vector
601        is smaller, the saved offsets during recursion go onto a local stack
602        vector, but for larger vectors malloc() is used. It was failing to free
603        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
604        error, in fact).
605    
606    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
607        heapframe that is used only when UTF-8 support is enabled. This caused no
608        problem, but was untidy.
609    
610    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
611        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
612        included within another project.
613    
614    24. Steven Van Ingelgem's patches to add more options to the CMake support,
615        slightly modified by me:
616    
617          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
618              not building pcregrep.
619    
620          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
621              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
622    
623    25. Forward references, both numeric and by name, in patterns that made use of
624        duplicate group numbers, could behave incorrectly or give incorrect errors,
625        because when scanning forward to find the reference group, PCRE was not
626        taking into account the duplicate group numbers. A pattern such as
627        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
628    
629    26. Changed a few more instances of "const unsigned char *" to USPTR, making
630        the feature of a custom pointer more persuasive (as requested by a user).
631    
632    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
633        pcretest.c, inside #ifndefs, because it seems they are sometimes already
634        pre-defined.
635    
636    28. Added support for (*UTF8) at the start of a pattern.
637    
638    29. Arrange for flags added by the "release type" setting in CMake to be shown
639        in the configuration summary.
640    
641    
642  Version 7.8 05-Sep-08  Version 7.8 05-Sep-08
643  ---------------------  ---------------------

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