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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.00 ??-???-??  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    
15    Version 8.10 25-Jun-2010
16    ------------------------
17    
18    1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
19        THEN.
20    
21    2.  (*ACCEPT) was not working when inside an atomic group.
22    
23    3.  Inside a character class, \B is treated as a literal by default, but
24        faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
25        causes the error). The code is unchanged, but I tidied the documentation.
26    
27    4.  Inside a character class, PCRE always treated \R and \X as literals,
28        whereas Perl faults them if its -w option is set. I have changed PCRE so
29        that it faults them when PCRE_EXTRA is set.
30    
31    5.  Added support for \N, which always matches any character other than
32        newline. (It is the same as "." when PCRE_DOTALL is not set.)
33    
34    6.  When compiling pcregrep with newer versions of gcc which may have
35        FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
36        declared with attribute warn_unused_result" were given. Just casting the
37        result to (void) does not stop the warnings; a more elaborate fudge is
38        needed. I've used a macro to implement this.
39    
40    7.  Minor change to pcretest.c to avoid a compiler warning.
41    
42    8.  Added four artifical Unicode properties to help with an option to make
43        \s etc use properties (see next item). The new properties are: Xan
44        (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
45    
46    9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
47        use Unicode properties. (*UCP) at the start of a pattern can be used to set
48        this option. Modified pcretest to add /W to test this facility. Added
49        REG_UCP to make it available via the POSIX interface.
50    
51    10. Added --line-buffered to pcregrep.
52    
53    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
54        studied, and the match started with a letter with a code point greater than
55        127 whose first byte was different to the first byte of the other case of
56        the letter, the other case of this starting letter was not recognized
57        (#976).
58    
59    12. If a pattern that was studied started with a repeated Unicode property
60        test, for example, \p{Nd}+, there was the theoretical possibility of
61        setting up an incorrect bitmap of starting bytes, but fortunately it could
62        not have actually happened in practice until change 8 above was made (it
63        added property types that matched character-matching opcodes).
64    
65    13. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
66        possible starting bytes for non-anchored patterns.
67    
68    14. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes
69        \R, and also a number of cases that involve Unicode properties, both
70        explicit and implicit when PCRE_UCP is set.
71    
72    15. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
73        input, it could crash or give wrong results if characters with values
74        greater than 0xc0 were present in the subject string. (Detail: it assumed
75        UTF-8 input when processing these items.)
76    
77    16. Added a lot of (int) casts to avoid compiler warnings in systems where
78        size_t is 64-bit (#991).
79    
80    17. Added a check for running out of memory when PCRE is compiled with
81        --disable-stack-for-recursion (#990).
82    
83    18. If the last data line in a file for pcretest does not have a newline on
84        the end, a newline was missing in the output.
85    
86    19. The default pcre_chartables.c file recognizes only ASCII characters (values
87        less than 128) in its various bitmaps. However, there is a facility for
88        generating tables according to the current locale when PCRE is compiled. It
89        turns out that in some environments, 0x85 and 0xa0, which are Unicode space
90        characters, are recognized by isspace() and therefore were getting set in
91        these tables, and indeed these tables seem to approximate to ISO 8859. This
92        caused a problem in UTF-8 mode when pcre_study() was used to create a list
93        of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
94        which of course cannot start UTF-8 characters. I have changed the code so
95        that only real ASCII characters (less than 128) and the correct starting
96        bytes for UTF-8 encodings are set for characters greater than 127 when in
97        UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
98        altogether.)
99    
100    20. Added the /T option to pcretest so as to be able to run tests with non-
101        standard character tables, thus making it possible to include the tests
102        used for 19 above in the standard set of tests.
103    
104    21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
105        reference to a subpattern the other side of a comment that contains an
106        opening parenthesis caused either an internal compiling error, or a
107        reference to the wrong subpattern.
108    
109    
110    Version 8.02 19-Mar-2010
111    ------------------------
112    
113    1.  The Unicode data tables have been updated to Unicode 5.2.0.
114    
115    2.  Added the option --libs-cpp to pcre-config, but only when C++ support is
116        configured.
117    
118    3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the
119        original author of that file, following a query about its status.
120    
121    4.  On systems that do not have stdint.h (e.g. Solaris), check for and include
122        inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.
123    
124    5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
125        quantifier applied to a forward-referencing subroutine call, could compile
126        incorrect code or give the error "internal error: previously-checked
127        referenced subpattern not found".
128    
129    6.  Both MS Visual Studio and Symbian OS have problems with initializing
130        variables to point to external functions. For these systems, therefore,
131        pcre_malloc etc. are now initialized to local functions that call the
132        relevant global functions.
133    
134    7.  There were two entries missing in the vectors called coptable and poptable
135        in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.
136        I've fixed the data, and added a kludgy way of testing at compile time that
137        the lengths are correct (equal to the number of opcodes).
138    
139    8.  Following on from 7, I added a similar kludge to check the length of the
140        eint vector in pcreposix.c.
141    
142    9.  Error texts for pcre_compile() are held as one long string to avoid too
143        much relocation at load time. To find a text, the string is searched,
144        counting zeros. There was no check for running off the end of the string,
145        which could happen if a new error number was added without updating the
146        string.
147    
148    10. \K gave a compile-time error if it appeared in a lookbehind assersion.
149    
150    11. \K was not working if it appeared in an atomic group or in a group that
151        was called as a "subroutine", or in an assertion. Perl 5.11 documents that
152        \K is "not well defined" if used in an assertion. PCRE now accepts it if
153        the assertion is positive, but not if it is negative.
154    
155    12. Change 11 fortuitously reduced the size of the stack frame used in the
156        "match()" function of pcre_exec.c by one pointer. Forthcoming
157        implementation of support for (*MARK) will need an extra pointer on the
158        stack; I have reserved it now, so that the stack frame size does not
159        decrease.
160    
161    13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other
162        item in branch that calls a recursion is a subroutine call - as in the
163        second branch in the above example - was incorrectly given the compile-
164        time error "recursive call could loop indefinitely" because pcre_compile()
165        was not correctly checking the subroutine for matching a non-empty string.
166    
167    14. The checks for overrunning compiling workspace could trigger after an
168        overrun had occurred. This is a "should never occur" error, but it can be
169        triggered by pathological patterns such as hundreds of nested parentheses.
170        The checks now trigger 100 bytes before the end of the workspace.
171    
172    15. Fix typo in configure.ac: "srtoq" should be "strtoq".
173    
174    
175    Version 8.01 19-Jan-2010
176    ------------------------
177    
178    1.  If a pattern contained a conditional subpattern with only one branch (in
179        particular, this includes all (*DEFINE) patterns), a call to pcre_study()
180        computed the wrong minimum data length (which is of course zero for such
181        subpatterns). This could cause incorrect "no match" results.
182    
183    2.  For patterns such as (?i)a(?-i)b|c where an option setting at the start of
184        the pattern is reset in the first branch, pcre_compile() failed with
185        "internal error: code overflow at offset...". This happened only when
186        the reset was to the original external option setting. (An optimization
187        abstracts leading options settings into an external setting, which was the
188        cause of this.)
189    
190    3.  A pattern such as ^(?!a(*SKIP)b) where a negative assertion contained one
191        of the verbs SKIP, PRUNE, or COMMIT, did not work correctly. When the
192        assertion pattern did not match (meaning that the assertion was true), it
193        was incorrectly treated as false if the SKIP had been reached during the
194        matching. This also applied to assertions used as conditions.
195    
196    4.  If an item that is not supported by pcre_dfa_exec() was encountered in an
197        assertion subpattern, including such a pattern used as a condition,
198        unpredictable results occurred, instead of the error return
199        PCRE_ERROR_DFA_UITEM.
200    
201    5.  The C++ GlobalReplace function was not working like Perl for the special
202        situation when an empty string is matched. It now does the fancy magic
203        stuff that is necessary.
204    
205    6.  In pcre_internal.h, obsolete includes to setjmp.h and stdarg.h have been
206        removed. (These were left over from very, very early versions of PCRE.)
207    
208    7.  Some cosmetic changes to the code to make life easier when compiling it
209        as part of something else:
210    
211        (a) Change DEBUG to PCRE_DEBUG.
212    
213        (b) In pcre_compile(), rename the member of the "branch_chain" structure
214            called "current" as "current_branch", to prevent a collision with the
215            Linux macro when compiled as a kernel module.
216    
217        (c) In pcre_study(), rename the function set_bit() as set_table_bit(), to
218            prevent a collision with the Linux macro when compiled as a kernel
219            module.
220    
221    8.  In pcre_compile() there are some checks for integer overflows that used to
222        cast potentially large values to (double). This has been changed to that
223        when building, a check for int64_t is made, and if it is found, it is used
224        instead, thus avoiding the use of floating point arithmetic. (There is no
225        other use of FP in PCRE.) If int64_t is not found, the fallback is to
226        double.
227    
228    9.  Added two casts to avoid signed/unsigned warnings from VS Studio Express
229        2005 (difference between two addresses compared to an unsigned value).
230    
231    10. Change the standard AC_CHECK_LIB test for libbz2 in configure.ac to a
232        custom one, because of the following reported problem in Windows:
233    
234          - libbz2 uses the Pascal calling convention (WINAPI) for the functions
235              under Win32.
236          - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",
237              therefore missing the function definition.
238          - The compiler thus generates a "C" signature for the test function.
239          - The linker fails to find the "C" function.
240          - PCRE fails to configure if asked to do so against libbz2.
241    
242    11. When running libtoolize from libtool-2.2.6b as part of autogen.sh, these
243        messages were output:
244    
245          Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and
246          rerunning libtoolize, to keep the correct libtool macros in-tree.
247          Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
248    
249        I have done both of these things.
250    
251    12. Although pcre_dfa_exec() does not use nearly as much stack as pcre_exec()
252        most of the time, it *can* run out if it is given a pattern that contains a
253        runaway infinite recursion. I updated the discussion in the pcrestack man
254        page.
255    
256    13. Now that we have gone to the x.xx style of version numbers, the minor
257        version may start with zero. Using 08 or 09 is a bad idea because users
258        might check the value of PCRE_MINOR in their code, and 08 or 09 may be
259        interpreted as invalid octal numbers. I've updated the previous comment in
260        configure.ac, and also added a check that gives an error if 08 or 09 are
261        used.
262    
263    14. Change 8.00/11 was not quite complete: code had been accidentally omitted,
264        causing partial matching to fail when the end of the subject matched \W
265        in a UTF-8 pattern where \W was quantified with a minimum of 3.
266    
267    15. There were some discrepancies between the declarations in pcre_internal.h
268        of _pcre_is_newline(), _pcre_was_newline(), and _pcre_valid_utf8() and
269        their definitions. The declarations used "const uschar *" and the
270        definitions used USPTR. Even though USPTR is normally defined as "const
271        unsigned char *" (and uschar is typedeffed as "unsigned char"), it was
272        reported that: "This difference in casting confuses some C++ compilers, for
273        example, SunCC recognizes above declarations as different functions and
274        generates broken code for hbpcre." I have changed the declarations to use
275        USPTR.
276    
277    16. GNU libtool is named differently on some systems. The autogen.sh script now
278        tries several variants such as glibtoolize (MacOSX) and libtoolize1x
279        (FreeBSD).
280    
281    17. Applied Craig's patch that fixes an HP aCC compile error in pcre 8.00
282        (strtoXX undefined when compiling pcrecpp.cc). The patch contains this
283        comment: "Figure out how to create a longlong from a string: strtoll and
284        equivalent. It's not enough to call AC_CHECK_FUNCS: hpux has a strtoll, for
285        instance, but it only takes 2 args instead of 3!"
286    
287    18. A subtle bug concerned with back references has been fixed by a change of
288        specification, with a corresponding code fix. A pattern such as
289        ^(xa|=?\1a)+$ which contains a back reference inside the group to which it
290        refers, was giving matches when it shouldn't. For example, xa=xaaa would
291        match that pattern. Interestingly, Perl (at least up to 5.11.3) has the
292        same bug. Such groups have to be quantified to be useful, or contained
293        inside another quantified group. (If there's no repetition, the reference
294        can never match.) The problem arises because, having left the group and
295        moved on to the rest of the pattern, a later failure that backtracks into
296        the group uses the captured value from the final iteration of the group
297        rather than the correct earlier one. I have fixed this in PCRE by forcing
298        any group that contains a reference to itself to be an atomic group; that
299        is, there cannot be any backtracking into it once it has completed. This is
300        similar to recursive and subroutine calls.
301    
302    
303    Version 8.00 19-Oct-09
304  ----------------------  ----------------------
305    
306  1.  The table for translating pcre_compile() error codes into POSIX error codes  1.  The table for translating pcre_compile() error codes into POSIX error codes
307      was out-of-date, and there was no check on the pcre_compile() error code      was out-of-date, and there was no check on the pcre_compile() error code
308      being within the table. This could lead to an OK return being given in      being within the table. This could lead to an OK return being given in
309      error.      error.
310    
311  2.  Changed the call to open a subject file in pcregrep from fopen(pathname,  2.  Changed the call to open a subject file in pcregrep from fopen(pathname,
312      "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests      "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
313      in a Windows environment.      in a Windows environment.
314    
315  3.  The pcregrep --count option prints the count for each file even when it is  3.  The pcregrep --count option prints the count for each file even when it is
316      zero, as does GNU grep. However, pcregrep was also printing all files when      zero, as does GNU grep. However, pcregrep was also printing all files when
317      --files-with-matches was added. Now, when both options are given, it prints      --files-with-matches was added. Now, when both options are given, it prints
318      counts only for those files that have at least one match. (GNU grep just      counts only for those files that have at least one match. (GNU grep just
319      prints the file name in this circumstance, but including the count seems      prints the file name in this circumstance, but including the count seems
320      more useful - otherwise, why use --count?) Also ensured that the      more useful - otherwise, why use --count?) Also ensured that the
321      combination -clh just lists non-zero counts, with no names.      combination -clh just lists non-zero counts, with no names.
322    
323  4.  The long form of the pcregrep -F option was incorrectly implemented as  4.  The long form of the pcregrep -F option was incorrectly implemented as
324      --fixed_strings instead of --fixed-strings. This is an incompatible change,      --fixed_strings instead of --fixed-strings. This is an incompatible change,
325      but it seems right to fix it, and I didn't think it was worth preserving      but it seems right to fix it, and I didn't think it was worth preserving
326      the old behaviour.      the old behaviour.
327    
328  5.  The command line items --regex=pattern and --regexp=pattern were not  5.  The command line items --regex=pattern and --regexp=pattern were not
329      recognized by pcregrep, which required --regex pattern or --regexp pattern      recognized by pcregrep, which required --regex pattern or --regexp pattern
330      (with a space rather than an '='). The man page documented the '=' forms,      (with a space rather than an '='). The man page documented the '=' forms,
331      which are compatible with GNU grep; these now work.      which are compatible with GNU grep; these now work.
332    
333  6.  No libpcreposix.pc file was created for pkg-config; there was just  6.  No libpcreposix.pc file was created for pkg-config; there was just
334      libpcre.pc and libpcrecpp.pc. The omission has been rectified.      libpcre.pc and libpcrecpp.pc. The omission has been rectified.
335    
336  7.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size  7.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
337      when UCP support is not needed, by modifying the Python script that      when UCP support is not needed, by modifying the Python script that
338      generates it from Unicode data files. This should not matter if the module      generates it from Unicode data files. This should not matter if the module
339      is correctly used as a library, but I received one complaint about 50K of      is correctly used as a library, but I received one complaint about 50K of
340      unwanted data. My guess is that the person linked everything into his      unwanted data. My guess is that the person linked everything into his
341      program rather than using a library. Anyway, it does no harm.      program rather than using a library. Anyway, it does no harm.
342    
343    8.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
344        was a minimum greater than 1 for a wide character in a possessive
345        repetition. The same bug could also affect patterns like /(\x{ff}{0,2})*/8
346        which had an unlimited repeat of a nested, fixed maximum repeat of a wide
347        character. Chaos in the form of incorrect output or a compiling loop could
348        result.
349    
350    9.  The restrictions on what a pattern can contain when partial matching is
351        requested for pcre_exec() have been removed. All patterns can now be
352        partially matched by this function. In addition, if there are at least two
353        slots in the offset vector, the offset of the earliest inspected character
354        for the match and the offset of the end of the subject are set in them when
355        PCRE_ERROR_PARTIAL is returned.
356    
357    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
358        synonymous with PCRE_PARTIAL, for backwards compatibility, and
359        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
360        and may be more useful for multi-segment matching.
361    
362    11. Partial matching with pcre_exec() is now more intuitive. A partial match
363        used to be given if ever the end of the subject was reached; now it is
364        given only if matching could not proceed because another character was
365        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
366        string "Z", which now yields "no match" instead of "partial match". In the
367        case of pcre_dfa_exec(), "no match" is given if every matching path for the
368        final character ended with (*FAIL).
369    
370    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
371        if the pattern had a "must contain" character that was already found in the
372        earlier partial match, unless partial matching was again requested. For
373        example, with the pattern /dog.(body)?/, the "must contain" character is
374        "g". If the first part-match was for the string "dog", restarting with
375        "sbody" failed. This bug has been fixed.
376    
377    13. The string returned by pcre_dfa_exec() after a partial match has been
378        changed so that it starts at the first inspected character rather than the
379        first character of the match. This makes a difference only if the pattern
380        starts with a lookbehind assertion or \b or \B (\K is not supported by
381        pcre_dfa_exec()). It's an incompatible change, but it makes the two
382        matching functions compatible, and I think it's the right thing to do.
383    
384    14. Added a pcredemo man page, created automatically from the pcredemo.c file,
385        so that the demonstration program is easily available in environments where
386        PCRE has not been installed from source.
387    
388    15. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
389        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
390        library.
391    
392    16. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
393        It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
394        is not the first non-POSIX option to be added. Clearly some people find
395        these options useful.
396    
397    17. If a caller to the POSIX matching function regexec() passes a non-zero
398        value for nmatch with a NULL value for pmatch, the value of
399        nmatch is forced to zero.
400    
401    18. RunGrepTest did not have a test for the availability of the -u option of
402        the diff command, as RunTest does. It now checks in the same way as
403        RunTest, and also checks for the -b option.
404    
405    19. If an odd number of negated classes containing just a single character
406        interposed, within parentheses, between a forward reference to a named
407        subpattern and the definition of the subpattern, compilation crashed with
408        an internal error, complaining that it could not find the referenced
409        subpattern. An example of a crashing pattern is /(?&A)(([^m])(?<A>))/.
410        [The bug was that it was starting one character too far in when skipping
411        over the character class, thus treating the ] as data rather than
412        terminating the class. This meant it could skip too much.]
413    
414    20. Added PCRE_NOTEMPTY_ATSTART in order to be able to correctly implement the
415        /g option in pcretest when the pattern contains \K, which makes it possible
416        to have an empty string match not at the start, even when the pattern is
417        anchored. Updated pcretest and pcredemo to use this option.
418    
419    21. If the maximum number of capturing subpatterns in a recursion was greater
420        than the maximum at the outer level, the higher number was returned, but
421        with unset values at the outer level. The correct (outer level) value is
422        now given.
423    
424    22. If (*ACCEPT) appeared inside capturing parentheses, previous releases of
425        PCRE did not set those parentheses (unlike Perl). I have now found a way to
426        make it do so. The string so far is captured, making this feature
427        compatible with Perl.
428    
429    23. The tests have been re-organized, adding tests 11 and 12, to make it
430        possible to check the Perl 5.10 features against Perl 5.10.
431    
432    24. Perl 5.10 allows subroutine calls in lookbehinds, as long as the subroutine
433        pattern matches a fixed length string. PCRE did not allow this; now it
434        does. Neither allows recursion.
435    
436    25. I finally figured out how to implement a request to provide the minimum
437        length of subject string that was needed in order to match a given pattern.
438        (It was back references and recursion that I had previously got hung up
439        on.) This code has now been added to pcre_study(); it finds a lower bound
440        to the length of subject needed. It is not necessarily the greatest lower
441        bound, but using it to avoid searching strings that are too short does give
442        some useful speed-ups. The value is available to calling programs via
443        pcre_fullinfo().
444    
445    26. While implementing 25, I discovered to my embarrassment that pcretest had
446        not been passing the result of pcre_study() to pcre_dfa_exec(), so the
447        study optimizations had never been tested with that matching function.
448        Oops. What is worse, even when it was passed study data, there was a bug in
449        pcre_dfa_exec() that meant it never actually used it. Double oops. There
450        were also very few tests of studied patterns with pcre_dfa_exec().
451    
452    27. If (?| is used to create subpatterns with duplicate numbers, they are now
453        allowed to have the same name, even if PCRE_DUPNAMES is not set. However,
454        on the other side of the coin, they are no longer allowed to have different
455        names, because these cannot be distinguished in PCRE, and this has caused
456        confusion. (This is a difference from Perl.)
457    
458    28. When duplicate subpattern names are present (necessarily with different
459        numbers, as required by 27 above), and a test is made by name in a
460        conditional pattern, either for a subpattern having been matched, or for
461        recursion in such a pattern, all the associated numbered subpatterns are
462        tested, and the overall condition is true if the condition is true for any
463        one of them. This is the way Perl works, and is also more like the way
464        testing by number works.
465    
466    
467  Version 7.9 11-Apr-09  Version 7.9 11-Apr-09
468  ---------------------  ---------------------

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