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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4    Version 8.13 30-Apr-2011
5    ------------------------
7    1.  The Unicode data tables have been updated to Unicode 6.0.0.
9    2.  Two minor typos in pcre_internal.h have been fixed.
11    3.  Added #include <string.h> to pcre_scanner_unittest.cc, pcrecpp.cc, and
12        pcrecpp_unittest.cc. They are needed for strcmp(), memset(), and strchr()
13        in some environments (e.g. Solaris 10/SPARC using Sun Studio 12U2).
15    4.  There were a number of related bugs in the code for matching backrefences
16        caselessly in UTF-8 mode when codes for the characters concerned were
17        different numbers of bytes. For example, U+023A and U+2C65 are an upper
18        and lower case pair, using 2 and 3 bytes, respectively. The main bugs were:
19        (a) A reference to 3 copies of a 2-byte code matched only 2 of a 3-byte
20        code. (b) A reference to 2 copies of a 3-byte code would not match 2 of a
21        2-byte code at the end of the subject (it thought there wasn't enough data
22        left).
24    5.  Comprehensive information about what went wrong is now returned by
25        pcre_exec() and pcre_dfa_exec() when the UTF-8 string check fails, as long
26        as the output vector has at least 2 elements. The offset of the start of
27        the failing character and a reason code are placed in the vector.
29    6.  When the UTF-8 string check fails for pcre_compile(), the offset that is
30        now returned is for the first byte of the failing character, instead of the
31        last byte inspected. This is an incompatible change, but I hope it is small
32        enough not to be a problem. It makes the returned offset consistent with
33        pcre_exec() and pcre_dfa_exec().
35    7.  pcretest now gives a text phrase as well as the error number when
36        pcre_exec() or pcre_dfa_exec() fails; if the error is a UTF-8 check
37        failure, the offset and reason code are output.
39    8.  When \R was used with a maximizing quantifier it failed to skip backwards
40        over a \r\n pair if the subsequent match failed. Instead, it just skipped
41        back over a single character (\n). This seems wrong (because it treated the
42        two characters as a single entity when going forwards), conflicts with the
43        documentation that \R is equivalent to (?>\r\n|\n|...etc), and makes the
44        behaviour of \R* different to (\R)*, which also seems wrong. The behaviour
45        has been changed.
47    9.  Some internal refactoring has changed the processing so that the handling
48        of the PCRE_CASELESS and PCRE_MULTILINE options is done entirely at compile
49        time (the PCRE_DOTALL option was changed this way some time ago: version
50        7.7 change 16). This has made it possible to abolish the OP_OPT op code,
51        which was always a bit of a fudge. It also means that there is one less
52        argument for the match() function, which reduces its stack requirements
53        slightly. This change also fixes an incompatibility with Perl: the pattern
54        (?i:([^b]))(?1) should not match "ab", but previously PCRE gave a match.
56    10. More internal refactoring has drastically reduced the number of recursive
57        calls to match() for possessively repeated groups such as (abc)++ when
58        using pcre_exec().
60    11. While implementing 10, a number of bugs in the handling of groups were
61        discovered and fixed:
63        (?<=(a)+) was not diagnosed as invalid (non-fixed-length lookbehind).
64        (a|)*(?1) gave a compile-time internal error.
65        ((a|)+)+  did not notice that the outer group could match an empty string.
66        (^a|^)+   was not marked as anchored.
67        (.*a|.*)+ was not marked as matching at start or after a newline.
69    12. Yet more internal refactoring has removed another argument from the match()
70        function. Special calls to this function are now indicated by setting a
71        value in a variable in the "match data" data block.
73    13. Be more explicit in pcre_study() instead of relying on "default" for
74        opcodes that mean there is no starting character; this means that when new
75        ones are added and accidentally left out of pcre_study(), testing should
76        pick them up.
78    14. The -s option of pcretest has been documented for ages as being an old
79        synonym of -m (show memory usage). I have changed it to mean "force study
80        for every regex", that is, assume /S for every regex. This is similar to -i
81        and -d etc. It's slightly incompatible, but I'm hoping nobody is still
82        using it. It makes it easier to run collection of tests with study enabled,
83        and thereby test pcre_study() more easily.
86    Version 8.12 15-Jan-2011
87    ------------------------
89    1.  Fixed some typos in the markup of the man pages, and wrote a script that
90        checks for such things as part of the documentation building process.
92    2.  On a big-endian 64-bit system, pcregrep did not correctly process the
93        --match-limit and --recursion-limit options (added for 8.11). In
94        particular, this made one of the standard tests fail. (The integer value
95        went into the wrong half of a long int.)
97    3.  If the --colour option was given to pcregrep with -v (invert match), it
98        did strange things, either producing crazy output, or crashing. It should,
99        of course, ignore a request for colour when reporting lines that do not
100        match.
102    4.  Another pcregrep bug caused similar problems if --colour was specified with
103        -M (multiline) and the pattern match finished with a line ending.
105    5.  In pcregrep, when a pattern that ended with a literal newline sequence was
106        matched in multiline mode, the following line was shown as part of the
107        match. This seems wrong, so I have changed it.
109    6.  Another pcregrep bug in multiline mode, when --colour was specified, caused
110        the check for further matches in the same line (so they could be coloured)
111        to overrun the end of the current line. If another match was found, it was
112        incorrectly shown (and then shown again when found in the next line).
114    7.  If pcregrep was compiled under Windows, there was a reference to the
115        function pcregrep_exit() before it was defined. I am assuming this was
116        the cause of the "error C2371: 'pcregrep_exit' : redefinition;" that was
117        reported by a user. I've moved the definition above the reference.
120    Version 8.11 10-Dec-2010
121    ------------------------
123    1.  (*THEN) was not working properly if there were untried alternatives prior
124        to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
125        backtracked to try for "b" instead of moving to the next alternative branch
126        at the same level (in this case, to look for "c"). The Perl documentation
127        is clear that when (*THEN) is backtracked onto, it goes to the "next
128        alternative in the innermost enclosing group".
130    2.  (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
131        such as   (A(*COMMIT)B(*THEN)C|D)  any failure after matching A should
132        result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
133        (*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
134        (*THEN).
136    3.  If \s appeared in a character class, it removed the VT character from
137        the class, even if it had been included by some previous item, for example
138        in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
139        of \s, but is part of the POSIX "space" class.)
141    4.  A partial match never returns an empty string (because you can always
142        match an empty string at the end of the subject); however the checking for
143        an empty string was starting at the "start of match" point. This has been
144        changed to the "earliest inspected character" point, because the returned
145        data for a partial match starts at this character. This means that, for
146        example, /(?<=abc)def/ gives a partial match for the subject "abc"
147        (previously it gave "no match").
149    5.  Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
150        of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
151        previously a full match would be given. However, setting PCRE_PARTIAL_HARD
152        has an implication that the given string is incomplete (because a partial
153        match is preferred over a full match). For this reason, these items now
154        give a partial match in this situation. [Aside: previously, the one case
155        /t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
156        match rather than a full match, which was wrong by the old rules, but is
157        now correct.]
159    6.  There was a bug in the handling of #-introduced comments, recognized when
160        PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
161        If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
162        UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
163        scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
164        but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
165        places in pcre_compile().
167    7.  Related to (6) above, when pcre_compile() was skipping #-introduced
168        comments when looking ahead for named forward references to subpatterns,
169        the only newline sequence it recognized was NL. It now handles newlines
170        according to the set newline convention.
172    8.  SunOS4 doesn't have strerror() or strtoul(); pcregrep dealt with the
173        former, but used strtoul(), whereas pcretest avoided strtoul() but did not
174        cater for a lack of strerror(). These oversights have been fixed.
176    9.  Added --match-limit and --recursion-limit to pcregrep.
178    10. Added two casts needed to build with Visual Studio when NO_RECURSE is set.
180    11. When the -o option was used, pcregrep was setting a return code of 1, even
181        when matches were found, and --line-buffered was not being honoured.
183    12. Added an optional parentheses number to the -o and --only-matching options
184        of pcregrep.
186    13. Imitating Perl's /g action for multiple matches is tricky when the pattern
187        can match an empty string. The code to do it in pcretest and pcredemo
188        needed fixing:
190        (a) When the newline convention was "crlf", pcretest got it wrong, skipping
191            only one byte after an empty string match just before CRLF (this case
192            just got forgotten; "any" and "anycrlf" were OK).
194        (b) The pcretest code also had a bug, causing it to loop forever in UTF-8
195            mode when an empty string match preceded an ASCII character followed by
196            a non-ASCII character. (The code for advancing by one character rather
197            than one byte was nonsense.)
199        (c) The pcredemo.c sample program did not have any code at all to handle
200            the cases when CRLF is a valid newline sequence.
202    14. Neither pcre_exec() nor pcre_dfa_exec() was checking that the value given
203        as a starting offset was within the subject string. There is now a new
204        error, PCRE_ERROR_BADOFFSET, which is returned if the starting offset is
205        negative or greater than the length of the string. In order to test this,
206        pcretest is extended to allow the setting of negative starting offsets.
208    15. In both pcre_exec() and pcre_dfa_exec() the code for checking that the
209        starting offset points to the beginning of a UTF-8 character was
210        unnecessarily clumsy. I tidied it up.
212    16. Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
213        bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
215    17. Nobody had reported that the --include_dir option, which was added in
216        release 7.7 should have been called --include-dir (hyphen, not underscore)
217        for compatibility with GNU grep. I have changed it to --include-dir, but
218        left --include_dir as an undocumented synonym, and the same for
219        --exclude-dir, though that is not available in GNU grep, at least as of
220        release 2.5.4.
222    18. At a user's suggestion, the macros GETCHAR and friends (which pick up UTF-8
223        characters from a string of bytes) have been redefined so as not to use
224        loops, in order to improve performance in some environments. At the same
225        time, I abstracted some of the common code into auxiliary macros to save
226        repetition (this should not affect the compiled code).
228    19. If \c was followed by a multibyte UTF-8 character, bad things happened. A
229        compile-time error is now given if \c is not followed by an ASCII
230        character, that is, a byte less than 128. (In EBCDIC mode, the code is
231        different, and any byte value is allowed.)
233    20. Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
234        START_OPTIMIZE option, which is now allowed at compile time - but just
235        passed through to pcre_exec() or pcre_dfa_exec(). This makes it available
236        to pcregrep and other applications that have no direct access to PCRE
237        options. The new /Y option in pcretest sets this option when calling
238        pcre_compile().
240    21. Change 18 of release 8.01 broke the use of named subpatterns for recursive
241        back references. Groups containing recursive back references were forced to
242        be atomic by that change, but in the case of named groups, the amount of
243        memory required was incorrectly computed, leading to "Failed: internal
244        error: code overflow". This has been fixed.
246    22. Some patches to pcre_stringpiece.h, pcre_stringpiece_unittest.cc, and
247        pcretest.c, to avoid build problems in some Borland environments.
250    Version 8.10 25-Jun-2010
251    ------------------------
253    1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
254        THEN.
256    2.  (*ACCEPT) was not working when inside an atomic group.
258    3.  Inside a character class, \B is treated as a literal by default, but
259        faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
260        causes the error). The code is unchanged, but I tidied the documentation.
262    4.  Inside a character class, PCRE always treated \R and \X as literals,
263        whereas Perl faults them if its -w option is set. I have changed PCRE so
264        that it faults them when PCRE_EXTRA is set.
266    5.  Added support for \N, which always matches any character other than
267        newline. (It is the same as "." when PCRE_DOTALL is not set.)
269    6.  When compiling pcregrep with newer versions of gcc which may have
270        FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
271        declared with attribute warn_unused_result" were given. Just casting the
272        result to (void) does not stop the warnings; a more elaborate fudge is
273        needed. I've used a macro to implement this.
275    7.  Minor change to pcretest.c to avoid a compiler warning.
277    8.  Added four artifical Unicode properties to help with an option to make
278        \s etc use properties (see next item). The new properties are: Xan
279        (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
281    9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
282        use Unicode properties. (*UCP) at the start of a pattern can be used to set
283        this option. Modified pcretest to add /W to test this facility. Added
284        REG_UCP to make it available via the POSIX interface.
286    10. Added --line-buffered to pcregrep.
288    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
289        studied, and the match started with a letter with a code point greater than
290        127 whose first byte was different to the first byte of the other case of
291        the letter, the other case of this starting letter was not recognized
292        (#976).
294    12. If a pattern that was studied started with a repeated Unicode property
295        test, for example, \p{Nd}+, there was the theoretical possibility of
296        setting up an incorrect bitmap of starting bytes, but fortunately it could
297        not have actually happened in practice until change 8 above was made (it
298        added property types that matched character-matching opcodes).
300    13. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
301        possible starting bytes for non-anchored patterns.
303    14. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes
304        \R, and also a number of cases that involve Unicode properties, both
305        explicit and implicit when PCRE_UCP is set.
307    15. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
308        input, it could crash or give wrong results if characters with values
309        greater than 0xc0 were present in the subject string. (Detail: it assumed
310        UTF-8 input when processing these items.)
312    16. Added a lot of (int) casts to avoid compiler warnings in systems where
313        size_t is 64-bit (#991).
315    17. Added a check for running out of memory when PCRE is compiled with
316        --disable-stack-for-recursion (#990).
318    18. If the last data line in a file for pcretest does not have a newline on
319        the end, a newline was missing in the output.
321    19. The default pcre_chartables.c file recognizes only ASCII characters (values
322        less than 128) in its various bitmaps. However, there is a facility for
323        generating tables according to the current locale when PCRE is compiled. It
324        turns out that in some environments, 0x85 and 0xa0, which are Unicode space
325        characters, are recognized by isspace() and therefore were getting set in
326        these tables, and indeed these tables seem to approximate to ISO 8859. This
327        caused a problem in UTF-8 mode when pcre_study() was used to create a list
328        of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
329        which of course cannot start UTF-8 characters. I have changed the code so
330        that only real ASCII characters (less than 128) and the correct starting
331        bytes for UTF-8 encodings are set for characters greater than 127 when in
332        UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
333        altogether.)
335    20. Added the /T option to pcretest so as to be able to run tests with non-
336        standard character tables, thus making it possible to include the tests
337        used for 19 above in the standard set of tests.
339    21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
340        reference to a subpattern the other side of a comment that contains an
341        opening parenthesis caused either an internal compiling error, or a
342        reference to the wrong subpattern.
345    Version 8.02 19-Mar-2010
346    ------------------------
348    1.  The Unicode data tables have been updated to Unicode 5.2.0.
350    2.  Added the option --libs-cpp to pcre-config, but only when C++ support is
351        configured.
353    3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the
354        original author of that file, following a query about its status.
356    4.  On systems that do not have stdint.h (e.g. Solaris), check for and include
357        inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.
359    5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
360        quantifier applied to a forward-referencing subroutine call, could compile
361        incorrect code or give the error "internal error: previously-checked
362        referenced subpattern not found".
364    6.  Both MS Visual Studio and Symbian OS have problems with initializing
365        variables to point to external functions. For these systems, therefore,
366        pcre_malloc etc. are now initialized to local functions that call the
367        relevant global functions.
369    7.  There were two entries missing in the vectors called coptable and poptable
370        in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.
371        I've fixed the data, and added a kludgy way of testing at compile time that
372        the lengths are correct (equal to the number of opcodes).
374    8.  Following on from 7, I added a similar kludge to check the length of the
375        eint vector in pcreposix.c.
377    9.  Error texts for pcre_compile() are held as one long string to avoid too
378        much relocation at load time. To find a text, the string is searched,
379        counting zeros. There was no check for running off the end of the string,
380        which could happen if a new error number was added without updating the
381        string.
383    10. \K gave a compile-time error if it appeared in a lookbehind assersion.
385    11. \K was not working if it appeared in an atomic group or in a group that
386        was called as a "subroutine", or in an assertion. Perl 5.11 documents that
387        \K is "not well defined" if used in an assertion. PCRE now accepts it if
388        the assertion is positive, but not if it is negative.
390    12. Change 11 fortuitously reduced the size of the stack frame used in the
391        "match()" function of pcre_exec.c by one pointer. Forthcoming
392        implementation of support for (*MARK) will need an extra pointer on the
393        stack; I have reserved it now, so that the stack frame size does not
394        decrease.
396    13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other
397        item in branch that calls a recursion is a subroutine call - as in the
398        second branch in the above example - was incorrectly given the compile-
399        time error "recursive call could loop indefinitely" because pcre_compile()
400        was not correctly checking the subroutine for matching a non-empty string.
402    14. The checks for overrunning compiling workspace could trigger after an
403        overrun had occurred. This is a "should never occur" error, but it can be
404        triggered by pathological patterns such as hundreds of nested parentheses.
405        The checks now trigger 100 bytes before the end of the workspace.
407    15. Fix typo in configure.ac: "srtoq" should be "strtoq".
410    Version 8.01 19-Jan-2010
411    ------------------------
413    1.  If a pattern contained a conditional subpattern with only one branch (in
414        particular, this includes all (*DEFINE) patterns), a call to pcre_study()
415        computed the wrong minimum data length (which is of course zero for such
416        subpatterns). This could cause incorrect "no match" results.
418    2.  For patterns such as (?i)a(?-i)b|c where an option setting at the start of
419        the pattern is reset in the first branch, pcre_compile() failed with
420        "internal error: code overflow at offset...". This happened only when
421        the reset was to the original external option setting. (An optimization
422        abstracts leading options settings into an external setting, which was the
423        cause of this.)
425    3.  A pattern such as ^(?!a(*SKIP)b) where a negative assertion contained one
426        of the verbs SKIP, PRUNE, or COMMIT, did not work correctly. When the
427        assertion pattern did not match (meaning that the assertion was true), it
428        was incorrectly treated as false if the SKIP had been reached during the
429        matching. This also applied to assertions used as conditions.
431    4.  If an item that is not supported by pcre_dfa_exec() was encountered in an
432        assertion subpattern, including such a pattern used as a condition,
433        unpredictable results occurred, instead of the error return
436    5.  The C++ GlobalReplace function was not working like Perl for the special
437        situation when an empty string is matched. It now does the fancy magic
438        stuff that is necessary.
440    6.  In pcre_internal.h, obsolete includes to setjmp.h and stdarg.h have been
441        removed. (These were left over from very, very early versions of PCRE.)
443    7.  Some cosmetic changes to the code to make life easier when compiling it
444        as part of something else:
446        (a) Change DEBUG to PCRE_DEBUG.
448        (b) In pcre_compile(), rename the member of the "branch_chain" structure
449            called "current" as "current_branch", to prevent a collision with the
450            Linux macro when compiled as a kernel module.
452        (c) In pcre_study(), rename the function set_bit() as set_table_bit(), to
453            prevent a collision with the Linux macro when compiled as a kernel
454            module.
456    8.  In pcre_compile() there are some checks for integer overflows that used to
457        cast potentially large values to (double). This has been changed to that
458        when building, a check for int64_t is made, and if it is found, it is used
459        instead, thus avoiding the use of floating point arithmetic. (There is no
460        other use of FP in PCRE.) If int64_t is not found, the fallback is to
461        double.
463    9.  Added two casts to avoid signed/unsigned warnings from VS Studio Express
464        2005 (difference between two addresses compared to an unsigned value).
466    10. Change the standard AC_CHECK_LIB test for libbz2 in configure.ac to a
467        custom one, because of the following reported problem in Windows:
469          - libbz2 uses the Pascal calling convention (WINAPI) for the functions
470              under Win32.
471          - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",
472              therefore missing the function definition.
473          - The compiler thus generates a "C" signature for the test function.
474          - The linker fails to find the "C" function.
475          - PCRE fails to configure if asked to do so against libbz2.
477    11. When running libtoolize from libtool-2.2.6b as part of autogen.sh, these
478        messages were output:
480          Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and
481          rerunning libtoolize, to keep the correct libtool macros in-tree.
482          Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
484        I have done both of these things.
486    12. Although pcre_dfa_exec() does not use nearly as much stack as pcre_exec()
487        most of the time, it *can* run out if it is given a pattern that contains a
488        runaway infinite recursion. I updated the discussion in the pcrestack man
489        page.
491    13. Now that we have gone to the x.xx style of version numbers, the minor
492        version may start with zero. Using 08 or 09 is a bad idea because users
493        might check the value of PCRE_MINOR in their code, and 08 or 09 may be
494        interpreted as invalid octal numbers. I've updated the previous comment in
495        configure.ac, and also added a check that gives an error if 08 or 09 are
496        used.
498    14. Change 8.00/11 was not quite complete: code had been accidentally omitted,
499        causing partial matching to fail when the end of the subject matched \W
500        in a UTF-8 pattern where \W was quantified with a minimum of 3.
502    15. There were some discrepancies between the declarations in pcre_internal.h
503        of _pcre_is_newline(), _pcre_was_newline(), and _pcre_valid_utf8() and
504        their definitions. The declarations used "const uschar *" and the
505        definitions used USPTR. Even though USPTR is normally defined as "const
506        unsigned char *" (and uschar is typedeffed as "unsigned char"), it was
507        reported that: "This difference in casting confuses some C++ compilers, for
508        example, SunCC recognizes above declarations as different functions and
509        generates broken code for hbpcre." I have changed the declarations to use
510        USPTR.
512    16. GNU libtool is named differently on some systems. The autogen.sh script now
513        tries several variants such as glibtoolize (MacOSX) and libtoolize1x
514        (FreeBSD).
516    17. Applied Craig's patch that fixes an HP aCC compile error in pcre 8.00
517        (strtoXX undefined when compiling pcrecpp.cc). The patch contains this
518        comment: "Figure out how to create a longlong from a string: strtoll and
519        equivalent. It's not enough to call AC_CHECK_FUNCS: hpux has a strtoll, for
520        instance, but it only takes 2 args instead of 3!"
522    18. A subtle bug concerned with back references has been fixed by a change of
523        specification, with a corresponding code fix. A pattern such as
524        ^(xa|=?\1a)+$ which contains a back reference inside the group to which it
525        refers, was giving matches when it shouldn't. For example, xa=xaaa would
526        match that pattern. Interestingly, Perl (at least up to 5.11.3) has the
527        same bug. Such groups have to be quantified to be useful, or contained
528        inside another quantified group. (If there's no repetition, the reference
529        can never match.) The problem arises because, having left the group and
530        moved on to the rest of the pattern, a later failure that backtracks into
531        the group uses the captured value from the final iteration of the group
532        rather than the correct earlier one. I have fixed this in PCRE by forcing
533        any group that contains a reference to itself to be an atomic group; that
534        is, there cannot be any backtracking into it once it has completed. This is
535        similar to recursive and subroutine calls.
538    Version 8.00 19-Oct-09
539    ----------------------
541    1.  The table for translating pcre_compile() error codes into POSIX error codes
542        was out-of-date, and there was no check on the pcre_compile() error code
543        being within the table. This could lead to an OK return being given in
544        error.
546    2.  Changed the call to open a subject file in pcregrep from fopen(pathname,
547        "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
548        in a Windows environment.
550    3.  The pcregrep --count option prints the count for each file even when it is
551        zero, as does GNU grep. However, pcregrep was also printing all files when
552        --files-with-matches was added. Now, when both options are given, it prints
553        counts only for those files that have at least one match. (GNU grep just
554        prints the file name in this circumstance, but including the count seems
555        more useful - otherwise, why use --count?) Also ensured that the
556        combination -clh just lists non-zero counts, with no names.
558    4.  The long form of the pcregrep -F option was incorrectly implemented as
559        --fixed_strings instead of --fixed-strings. This is an incompatible change,
560        but it seems right to fix it, and I didn't think it was worth preserving
561        the old behaviour.
563    5.  The command line items --regex=pattern and --regexp=pattern were not
564        recognized by pcregrep, which required --regex pattern or --regexp pattern
565        (with a space rather than an '='). The man page documented the '=' forms,
566        which are compatible with GNU grep; these now work.
568    6.  No libpcreposix.pc file was created for pkg-config; there was just
569        libpcre.pc and libpcrecpp.pc. The omission has been rectified.
571    7.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
572        when UCP support is not needed, by modifying the Python script that
573        generates it from Unicode data files. This should not matter if the module
574        is correctly used as a library, but I received one complaint about 50K of
575        unwanted data. My guess is that the person linked everything into his
576        program rather than using a library. Anyway, it does no harm.
578    8.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
579        was a minimum greater than 1 for a wide character in a possessive
580        repetition. The same bug could also affect patterns like /(\x{ff}{0,2})*/8
581        which had an unlimited repeat of a nested, fixed maximum repeat of a wide
582        character. Chaos in the form of incorrect output or a compiling loop could
583        result.
585    9.  The restrictions on what a pattern can contain when partial matching is
586        requested for pcre_exec() have been removed. All patterns can now be
587        partially matched by this function. In addition, if there are at least two
588        slots in the offset vector, the offset of the earliest inspected character
589        for the match and the offset of the end of the subject are set in them when
590        PCRE_ERROR_PARTIAL is returned.
592    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
593        synonymous with PCRE_PARTIAL, for backwards compatibility, and
594        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
595        and may be more useful for multi-segment matching.
597    11. Partial matching with pcre_exec() is now more intuitive. A partial match
598        used to be given if ever the end of the subject was reached; now it is
599        given only if matching could not proceed because another character was
600        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
601        string "Z", which now yields "no match" instead of "partial match". In the
602        case of pcre_dfa_exec(), "no match" is given if every matching path for the
603        final character ended with (*FAIL).
605    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
606        if the pattern had a "must contain" character that was already found in the
607        earlier partial match, unless partial matching was again requested. For
608        example, with the pattern /dog.(body)?/, the "must contain" character is
609        "g". If the first part-match was for the string "dog", restarting with
610        "sbody" failed. This bug has been fixed.
612    13. The string returned by pcre_dfa_exec() after a partial match has been
613        changed so that it starts at the first inspected character rather than the
614        first character of the match. This makes a difference only if the pattern
615        starts with a lookbehind assertion or \b or \B (\K is not supported by
616        pcre_dfa_exec()). It's an incompatible change, but it makes the two
617        matching functions compatible, and I think it's the right thing to do.
619    14. Added a pcredemo man page, created automatically from the pcredemo.c file,
620        so that the demonstration program is easily available in environments where
621        PCRE has not been installed from source.
623    15. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
624        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
625        library.
627    16. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
628        It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
629        is not the first non-POSIX option to be added. Clearly some people find
630        these options useful.
632    17. If a caller to the POSIX matching function regexec() passes a non-zero
633        value for nmatch with a NULL value for pmatch, the value of
634        nmatch is forced to zero.
636    18. RunGrepTest did not have a test for the availability of the -u option of
637        the diff command, as RunTest does. It now checks in the same way as
638        RunTest, and also checks for the -b option.
640    19. If an odd number of negated classes containing just a single character
641        interposed, within parentheses, between a forward reference to a named
642        subpattern and the definition of the subpattern, compilation crashed with
643        an internal error, complaining that it could not find the referenced
644        subpattern. An example of a crashing pattern is /(?&A)(([^m])(?<A>))/.
645        [The bug was that it was starting one character too far in when skipping
646        over the character class, thus treating the ] as data rather than
647        terminating the class. This meant it could skip too much.]
649    20. Added PCRE_NOTEMPTY_ATSTART in order to be able to correctly implement the
650        /g option in pcretest when the pattern contains \K, which makes it possible
651        to have an empty string match not at the start, even when the pattern is
652        anchored. Updated pcretest and pcredemo to use this option.
654    21. If the maximum number of capturing subpatterns in a recursion was greater
655        than the maximum at the outer level, the higher number was returned, but
656        with unset values at the outer level. The correct (outer level) value is
657        now given.
659    22. If (*ACCEPT) appeared inside capturing parentheses, previous releases of
660        PCRE did not set those parentheses (unlike Perl). I have now found a way to
661        make it do so. The string so far is captured, making this feature
662        compatible with Perl.
664    23. The tests have been re-organized, adding tests 11 and 12, to make it
665        possible to check the Perl 5.10 features against Perl 5.10.
667    24. Perl 5.10 allows subroutine calls in lookbehinds, as long as the subroutine
668        pattern matches a fixed length string. PCRE did not allow this; now it
669        does. Neither allows recursion.
671    25. I finally figured out how to implement a request to provide the minimum
672        length of subject string that was needed in order to match a given pattern.
673        (It was back references and recursion that I had previously got hung up
674        on.) This code has now been added to pcre_study(); it finds a lower bound
675        to the length of subject needed. It is not necessarily the greatest lower
676        bound, but using it to avoid searching strings that are too short does give
677        some useful speed-ups. The value is available to calling programs via
678        pcre_fullinfo().
680    26. While implementing 25, I discovered to my embarrassment that pcretest had
681        not been passing the result of pcre_study() to pcre_dfa_exec(), so the
682        study optimizations had never been tested with that matching function.
683        Oops. What is worse, even when it was passed study data, there was a bug in
684        pcre_dfa_exec() that meant it never actually used it. Double oops. There
685        were also very few tests of studied patterns with pcre_dfa_exec().
687    27. If (?| is used to create subpatterns with duplicate numbers, they are now
688        allowed to have the same name, even if PCRE_DUPNAMES is not set. However,
689        on the other side of the coin, they are no longer allowed to have different
690        names, because these cannot be distinguished in PCRE, and this has caused
691        confusion. (This is a difference from Perl.)
693    28. When duplicate subpattern names are present (necessarily with different
694        numbers, as required by 27 above), and a test is made by name in a
695        conditional pattern, either for a subpattern having been matched, or for
696        recursion in such a pattern, all the associated numbered subpatterns are
697        tested, and the overall condition is true if the condition is true for any
698        one of them. This is the way Perl works, and is also more like the way
699        testing by number works.
702    Version 7.9 11-Apr-09
703    ---------------------
705    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
706        (pcretest), all targets were linked against these libraries. This included
707        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
708        libraries. This caused unwanted dependencies to be created. This problem
709        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
710        pcretest is linked with readline.
712    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
713        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
714        moved outside it again, because FALSE and TRUE are already defined in AIX,
715        but BOOL is not.
717    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
718        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
720    4.  The pcregrep documentation said spaces were inserted as well as colons (or
721        hyphens) following file names and line numbers when outputting matching
722        lines. This is not true; no spaces are inserted. I have also clarified the
723        wording for the --colour (or --color) option.
725    5.  In pcregrep, when --colour was used with -o, the list of matching strings
726        was not coloured; this is different to GNU grep, so I have changed it to be
727        the same.
729    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
730        each matching line was coloured. Now it goes on to look for further matches
731        of any of the test patterns, which is the same behaviour as GNU grep.
733    7.  A pattern that could match an empty string could cause pcregrep to loop; it
734        doesn't make sense to accept an empty string match in pcregrep, so I have
735        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
736        seems to be how GNU grep behaves.
738    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
739        start or after a newline", because the conditional assertion was not being
740        correctly handled. The rule now is that both the assertion and what follows
741        in the first alternative must satisfy the test.
743    9.  If auto-callout was enabled in a pattern with a conditional group whose
744        condition was an assertion, PCRE could crash during matching, both with
745        pcre_exec() and pcre_dfa_exec().
747    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
748        used for matching.
750    11. Unicode property support in character classes was not working for
751        characters (bytes) greater than 127 when not in UTF-8 mode.
753    12. Added the -M command line option to pcretest.
755    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
757    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
759    16. Added comments and documentation about mis-use of no_arg in the C++
760        wrapper.
762    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
763        from Martin Jerabek that uses macro names for all relevant character and
764        string constants.
766    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
767        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
768        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
769        these, but not everybody uses configure.
771    19. A conditional group that had only one branch was not being correctly
772        recognized as an item that could match an empty string. This meant that an
773        enclosing group might also not be so recognized, causing infinite looping
774        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
775        with the subject "ab", where knowledge that the repeated group can match
776        nothing is needed in order to break the loop.
778    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
779        exec(), but without supplying a callout function, matching went wrong.
781    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
782        leak if the size of the offset vector was greater than 30. When the vector
783        is smaller, the saved offsets during recursion go onto a local stack
784        vector, but for larger vectors malloc() is used. It was failing to free
785        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
786        error, in fact).
788    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
789        heapframe that is used only when UTF-8 support is enabled. This caused no
790        problem, but was untidy.
792    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
793        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
794        included within another project.
796    24. Steven Van Ingelgem's patches to add more options to the CMake support,
797        slightly modified by me:
799          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
800              not building pcregrep.
802          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
803              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
805    25. Forward references, both numeric and by name, in patterns that made use of
806        duplicate group numbers, could behave incorrectly or give incorrect errors,
807        because when scanning forward to find the reference group, PCRE was not
808        taking into account the duplicate group numbers. A pattern such as
809        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
811    26. Changed a few more instances of "const unsigned char *" to USPTR, making
812        the feature of a custom pointer more persuasive (as requested by a user).
814    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
815        pcretest.c, inside #ifndefs, because it seems they are sometimes already
816        pre-defined.
818    28. Added support for (*UTF8) at the start of a pattern.
820    29. Arrange for flags added by the "release type" setting in CMake to be shown
821        in the configuration summary.
824    Version 7.8 05-Sep-08
825    ---------------------
827    1.  Replaced UCP searching code with optimized version as implemented for Ad
828        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
829        stage table and inline lookup instead of a function, giving speed ups of 2
830        to 5 times on some simple patterns that I tested. Permission was given to
831        distribute the MultiStage2.py script that generates the tables (it's not in
832        the tarball, but is in the Subversion repository).
834    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
835        scripts.
837    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
838        a group with a zero qualifier. The result of the study could be incorrect,
839        or the function might crash, depending on the pattern.
841    4.  Caseless matching was not working for non-ASCII characters in back
842        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
843        It now works when Unicode Property Support is available.
845    5.  In pcretest, an escape such as \x{de} in the data was always generating
846        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
847        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
848        truncation.
850    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
852    7.  Added two (int) casts to pcregrep when printing the difference of two
853        pointers, in case they are 64-bit values.
855    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
856        test 2 if it fails.
858    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
859        and a #define of that name to empty if it is not externally set. This is to
860        allow users of MSVC to set it if necessary.
862    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
863        the convenience functions in the pcre_get.c source file.
865    11. An option change at the start of a pattern that had top-level alternatives
866        could cause overwriting and/or a crash. This command provoked a crash in
867        some environments:
869          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
871        This potential security problem was recorded as CVE-2008-2371.
873    12. For a pattern where the match had to start at the beginning or immediately
874        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
875        pcre_dfa_exec() could read past the end of the passed subject if there was
876        no match. To help with detecting such bugs (e.g. with valgrind), I modified
877        pcretest so that it places the subject at the end of its malloc-ed buffer.
879    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
880        exec() might read past the end of the data buffer in UTF-8 mode.
882    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
883        the data contained the byte 0x85 as part of a UTF-8 character within its
884        first line. This applied both to normal and DFA matching.
886    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
887        /^[^d]*?$/8 failed to match "abc".
889    16. Added a missing copyright notice to pcrecpp_internal.h.
891    17. Make it more clear in the documentation that values returned from
892        pcre_exec() in ovector are byte offsets, not character counts.
894    18. Tidied a few places to stop certain compilers from issuing warnings.
896    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
897        supplied by Stefan Weber. I made a further small update for 7.8 because
898        there is a change of source arrangements: the pcre_searchfuncs.c module is
899        replaced by pcre_ucd.c.
902    Version 7.7 07-May-08
903    ---------------------
905    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
906        a string to a long long, pretend we don't even have a long long." This is
907        done by checking for the strtoq, strtoll, and _strtoi64 functions.
909    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
910        pre-7.6 versions, which defined a global no_arg variable instead of putting
911        it in the RE class. (See also #8 below.)
913    3.  Remove a line of dead code, identified by coverity and reported by Nuno
914        Lopes.
916    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
918        (1) The include/exclude patterns were being applied to the whole pathnames
919            of files, instead of just to the final components.
921        (2) If there was more than one level of directory, the subdirectories were
922            skipped unless they satisfied the include/exclude conditions. This is
923            inconsistent with GNU grep (and could even be seen as contrary to the
924            pcregrep specification - which I improved to make it absolutely clear).
925            The action now is always to scan all levels of directory, and just
926            apply the include/exclude patterns to regular files.
928    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
929        --exclude_dir in the tests to avoid scanning .svn directories.
931    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
932        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
933        doesn't support NULs in patterns.
935    7.  Added some missing "const"s to declarations of static tables in
936        pcre_compile.c and pcre_dfa_exec.c.
938    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
939        caused by fix #2  above. (Subsequently also a second patch to fix the
940        first patch. And a third patch - this was a messy problem.)
942    9.  Applied Craig's patch to remove the use of push_back().
944    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
945        matching function regexec().
947    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
948        which, however, unlike Perl's \g{...}, are subroutine calls, not back
949        references. PCRE supports relative numbers with this syntax (I don't think
950        Oniguruma does).
952    12. Previously, a group with a zero repeat such as (...){0} was completely
953        omitted from the compiled regex. However, this means that if the group
954        was called as a subroutine from elsewhere in the pattern, things went wrong
955        (an internal error was given). Such groups are now left in the compiled
956        pattern, with a new opcode that causes them to be skipped at execution
957        time.
959    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
960        to the way PCRE behaves:
962        (a) A lone ] character is dis-allowed (Perl treats it as data).
964        (b) A back reference to an unmatched subpattern matches an empty string
965            (Perl fails the current match path).
967        (c) A data ] in a character class must be notated as \] because if the
968            first data character in a class is ], it defines an empty class. (In
969            Perl it is not possible to have an empty class.) The empty class []
970            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
971            The negative empty class [^] matches any one character, independently
972            of the DOTALL setting.
974    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
975        non-existent subpattern following a character class starting with ']' and
976        containing () gave an internal compiling error instead of "reference to
977        non-existent subpattern". Fortunately, when the pattern did exist, the
978        compiled code was correct. (When scanning forwards to check for the
979        existencd of the subpattern, it was treating the data ']' as terminating
980        the class, so got the count wrong. When actually compiling, the reference
981        was subsequently set up correctly.)
983    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
984        it was being rejected as not supported by pcre_dfa_exec(), even though
985        other assertions are supported. I have made pcre_dfa_exec() support
986        (*FAIL).
988    16. The implementation of 13c above involved the invention of a new opcode,
989        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
990        cannot be changed at match time, I realized I could make a small
991        improvement to matching performance by compiling OP_ALLANY instead of
992        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
993        on the OP_ANY path.
995    17. Compiling pcretest on Windows with readline support failed without the
996        following two fixes: (1) Make the unistd.h include conditional on
997        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
999    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
1000        ncurses library to be included for pcretest when ReadLine support is
1001        requested, but also to allow for it to be overridden. This patch came from
1002        Daniel Bergström.
1004    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
1005        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
1006        any errors with the current Unicode tables. Thanks to Peter Kankowski for
1007        spotting this.
1010    Version 7.6 28-Jan-08
1011    ---------------------
1013    1.  A character class containing a very large number of characters with
1014        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
1015        overflow.
1017    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
1018        HAVE_LONG_LONG is not defined.
1020    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
1021        bring them up to date and include new features. This patch includes:
1023        - Fixed PH's badly added libz and libbz2 support.
1024        - Fixed a problem with static linking.
1025        - Added pcredemo. [But later removed - see 7 below.]
1026        - Fixed dftables problem and added an option.
1027        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
1028            HAVE_LONG_LONG.
1029        - Added readline support for pcretest.
1030        - Added an listing of the option settings after cmake has run.
1032    4.  A user submitted a patch to Makefile that makes it easy to create
1033        "pcre.dll" under mingw when using Configure/Make. I added stuff to
1034        Makefile.am that cause it to include this special target, without
1035        affecting anything else. Note that the same mingw target plus all
1036        the other distribution libraries and programs are now supported
1037        when configuring with CMake (see 6 below) instead of with
1038        Configure/Make.
1040    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
1041        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
1042        exported in the Windows port". It has not yet been confirmed that the patch
1043        solves the problem, but it does no harm.
1045    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
1046        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
1047        with CMake, and also correct the comment about stack recursion.
1049    7.  Remove the automatic building of pcredemo from the ./configure system and
1050        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
1051        of a program that users should build themselves after PCRE is installed, so
1052        building it automatically is not really right. What is more, it gave
1053        trouble in some build environments.
1055    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
1058    Version 7.5 10-Jan-08
1059    ---------------------
1061    1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
1062        values in parens when parsing an RE using the C++ wrapper."
1064    2.  Negative specials like \S did not work in character classes in UTF-8 mode.
1065        Characters greater than 255 were excluded from the class instead of being
1066        included.
1068    3.  The same bug as (2) above applied to negated POSIX classes such as
1069        [:^space:].
1071    4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
1072        defined or documented. It seems to have been a typo for PCRE_STATIC, so
1073        I have changed it.
1075    5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
1076        first named subpattern) and a construct such as (?&a) would reference the
1077        first named subpattern whose name started with "a" (in other words, the
1078        length check was missing). Both these problems are fixed. "Subpattern name
1079        expected" is now given for (?&) (a zero-length name), and this patch also
1080        makes it give the same error for \k'' (previously it complained that that
1081        was a reference to a non-existent subpattern).
1083    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
1084        this is right because (?- can be followed by option settings as well as by
1085        digits. I have, however, made the messages clearer.
1087    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
1088        than the number used in the conditional) now cause a compile-time error.
1089        This is actually not compatible with Perl, which accepts such patterns, but
1090        treats the conditional as always being FALSE (as PCRE used to), but it
1091        seems to me that giving a diagnostic is better.
1093    8.  Change "alphameric" to the more common word "alphanumeric" in comments
1094        and messages.
1096    9.  Fix two occurrences of "backslash" in comments that should have been
1097        "backspace".
1099    10. Remove two redundant lines of code that can never be obeyed (their function
1100        was moved elsewhere).
1102    11. The program that makes PCRE's Unicode character property table had a bug
1103        which caused it to generate incorrect table entries for sequences of
1104        characters that have the same character type, but are in different scripts.
1105        It amalgamated them into a single range, with the script of the first of
1106        them. In other words, some characters were in the wrong script. There were
1107        thirteen such cases, affecting characters in the following ranges:
1109          U+002b0 - U+002c1
1110          U+0060c - U+0060d
1111          U+0061e - U+00612
1112          U+0064b - U+0065e
1113          U+0074d - U+0076d
1114          U+01800 - U+01805
1115          U+01d00 - U+01d77
1116          U+01d9b - U+01dbf
1117          U+0200b - U+0200f
1118          U+030fc - U+030fe
1119          U+03260 - U+0327f
1120          U+0fb46 - U+0fbb1
1121          U+10450 - U+1049d
1123    12. The -o option (show only the matching part of a line) for pcregrep was not
1124        compatible with GNU grep in that, if there was more than one match in a
1125        line, it showed only the first of them. It now behaves in the same way as
1126        GNU grep.
1128    13. If the -o and -v options were combined for pcregrep, it printed a blank
1129        line for every non-matching line. GNU grep prints nothing, and pcregrep now
1130        does the same. The return code can be used to tell if there were any
1131        non-matching lines.
1133    14. Added --file-offsets and --line-offsets to pcregrep.
1135    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
1136        infinitely looping recursion. The bug was that positive lookaheads were not
1137        being skipped when checking for a possible empty match (negative lookaheads
1138        and both kinds of lookbehind were skipped).
1140    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
1141        inclusion of <windows.h> to before rather than after the definition of
1142        INVALID_FILE_ATTRIBUTES (patch from David Byron).
1144    17. Specifying a possessive quantifier with a specific limit for a Unicode
1145        character property caused pcre_compile() to compile bad code, which led at
1146        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
1147        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
1148        caused the error; without that there was no problem.
1150    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
1152    19. Added --enable-pcretest-libreadline.
1154    20. In pcrecpp.cc, the variable 'count' was incremented twice in
1155        RE::GlobalReplace(). As a result, the number of replacements returned was
1156        double what it should be. I removed one of the increments, but Craig sent a
1157        later patch that removed the other one (the right fix) and added unit tests
1158        that check the return values (which was not done before).
1160    21. Several CMake things:
1162        (1) Arranged that, when cmake is used on Unix, the libraries end up with
1163            the names libpcre and libpcreposix, not just pcre and pcreposix.
1165        (2) The above change means that pcretest and pcregrep are now correctly
1166            linked with the newly-built libraries, not previously installed ones.
1170    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
1171        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
1172        UTF-8 newline character). The key issue is that the pattern starts .*;
1173        this means that the match must be either at the beginning, or after a
1174        newline. The bug was in the code for advancing after a failed match and
1175        checking that the new position followed a newline. It was not taking
1176        account of UTF-8 characters correctly.
1178    23. PCRE was behaving differently from Perl in the way it recognized POSIX
1179        character classes. PCRE was not treating the sequence [:...:] as a
1180        character class unless the ... were all letters. Perl, however, seems to
1181        allow any characters between [: and :], though of course it rejects as
1182        unknown any "names" that contain non-letters, because all the known class
1183        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
1184        for example, whereas PCRE did not - it did not recognize a POSIX character
1185        class. This seemed a bit dangerous, so the code has been changed to be
1186        closer to Perl. The behaviour is not identical to Perl, because PCRE will
1187        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
1188        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
1189        Perl does, and where it didn't before.
1191    24. Rewrite so as to remove the single use of %n from pcregrep because in some
1192        Windows environments %n is disabled by default.
1195    Version 7.4 21-Sep-07
1196    ---------------------
1198    1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This
1199        means that a class such as [\s] counted as "explicit reference to CR or
1200        LF". That isn't really right - the whole point of the change was to try to
1201        help when there was an actual mention of one of the two characters. So now
1202        the change happens only if \r or \n (or a literal CR or LF) character is
1203        encountered.
1205    2.  The 32-bit options word was also used for 6 internal flags, but the numbers
1206        of both had grown to the point where there were only 3 bits left.
1207        Fortunately, there was spare space in the data structure, and so I have
1208        moved the internal flags into a new 16-bit field to free up more option
1209        bits.
1211    3.  The appearance of (?J) at the start of a pattern set the DUPNAMES option,
1212        but did not set the internal JCHANGED flag - either of these is enough to
1213        control the way the "get" function works - but the PCRE_INFO_JCHANGED
1214        facility is supposed to tell if (?J) was ever used, so now (?J) at the
1215        start sets both bits.
1217    4.  Added options (at build time, compile time, exec time) to change \R from
1218        matching any Unicode line ending sequence to just matching CR, LF, or CRLF.
1220    5.  doc/pcresyntax.html was missing from the distribution.
1222    6.  Put back the definition of PCRE_ERROR_NULLWSLIMIT, for backward
1223        compatibility, even though it is no longer used.
1225    7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and
1226        strtoull to pcrecpp.cc to select the available functions in WIN32 when the
1227        windows.h file is present (where different names are used). [This was
1228        reversed later after testing - see 16 below.]
1230    8.  Changed all #include <config.h> to #include "config.h". There were also
1231        some further <pcre.h> cases that I changed to "pcre.h".
1233    9.  When pcregrep was used with the --colour option, it missed the line ending
1234        sequence off the lines that it output.
1236    10. It was pointed out to me that arrays of string pointers cause lots of
1237        relocations when a shared library is dynamically loaded. A technique of
1238        using a single long string with a table of offsets can drastically reduce
1239        these. I have refactored PCRE in four places to do this. The result is
1240        dramatic:
1242          Originally:                          290
1243          After changing UCP table:            187
1244          After changing error message table:   43
1245          After changing table of "verbs"       36
1246          After changing table of Posix names   22
1248        Thanks to the folks working on Gregex for glib for this insight.
1250    11. --disable-stack-for-recursion caused compiling to fail unless -enable-
1251        unicode-properties was also set.
1253    12. Updated the tests so that they work when \R is defaulted to ANYCRLF.
1255    13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously
1256        checked only for CRLF.
1258    14. Added casts to pcretest.c to avoid compiler warnings.
1260    15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
1262    16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
1263        and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
1264        entirely. This removes changes made in 7 above.
1266    17. The CMake files have been updated, and there is now more information about
1267        building with CMake in the NON-UNIX-USE document.
1270    Version 7.3 28-Aug-07
1271    ---------------------
1273     1. In the rejigging of the build system that eventually resulted in 7.1, the
1274        line "#include <pcre.h>" was included in pcre_internal.h. The use of angle
1275        brackets there is not right, since it causes compilers to look for an
1276        installed pcre.h, not the version that is in the source that is being
1277        compiled (which of course may be different). I have changed it back to:
1279          #include "pcre.h"
1281        I have a vague recollection that the change was concerned with compiling in
1282        different directories, but in the new build system, that is taken care of
1283        by the VPATH setting the Makefile.
1285     2. The pattern .*$ when run in not-DOTALL UTF-8 mode with newline=any failed
1286        when the subject happened to end in the byte 0x85 (e.g. if the last
1287        character was \x{1ec5}). *Character* 0x85 is one of the "any" newline
1288        characters but of course it shouldn't be taken as a newline when it is part
1289        of another character. The bug was that, for an unlimited repeat of . in
1290        not-DOTALL UTF-8 mode, PCRE was advancing by bytes rather than by
1291        characters when looking for a newline.
1293     3. A small performance improvement in the DOTALL UTF-8 mode .* case.
1295     4. Debugging: adjusted the names of opcodes for different kinds of parentheses
1296        in debug output.
1298     5. Arrange to use "%I64d" instead of "%lld" and "%I64u" instead of "%llu" for
1299        long printing in the pcrecpp unittest when running under MinGW.
1301     6. ESC_K was left out of the EBCDIC table.
1303     7. Change 7.0/38 introduced a new limit on the number of nested non-capturing
1304        parentheses; I made it 1000, which seemed large enough. Unfortunately, the
1305        limit also applies to "virtual nesting" when a pattern is recursive, and in
1306        this case 1000 isn't so big. I have been able to remove this limit at the
1307        expense of backing off one optimization in certain circumstances. Normally,
1308        when pcre_exec() would call its internal match() function recursively and
1309        immediately return the result unconditionally, it uses a "tail recursion"
1310        feature to save stack. However, when a subpattern that can match an empty
1311        string has an unlimited repetition quantifier, it no longer makes this
1312        optimization. That gives it a stack frame in which to save the data for
1313        checking that an empty string has been matched. Previously this was taken
1314        from the 1000-entry workspace that had been reserved. So now there is no
1315        explicit limit, but more stack is used.
1317     8. Applied Daniel's patches to solve problems with the import/export magic
1318        syntax that is required for Windows, and which was going wrong for the
1319        pcreposix and pcrecpp parts of the library. These were overlooked when this
1320        problem was solved for the main library.
1322     9. There were some crude static tests to avoid integer overflow when computing
1323        the size of patterns that contain repeated groups with explicit upper
1324        limits. As the maximum quantifier is 65535, the maximum group length was
1325        set at 30,000 so that the product of these two numbers did not overflow a
1326        32-bit integer. However, it turns out that people want to use groups that
1327        are longer than 30,000 bytes (though not repeat them that many times).
1328        Change 7.0/17 (the refactoring of the way the pattern size is computed) has
1329        made it possible to implement the integer overflow checks in a much more
1330        dynamic way, which I have now done. The artificial limitation on group
1331        length has been removed - we now have only the limit on the total length of
1332        the compiled pattern, which depends on the LINK_SIZE setting.
1334    10. Fixed a bug in the documentation for get/copy named substring when
1335        duplicate names are permitted. If none of the named substrings are set, the
1336        functions return PCRE_ERROR_NOSUBSTRING (7); the doc said they returned an
1337        empty string.
1339    11. Because Perl interprets \Q...\E at a high level, and ignores orphan \E
1340        instances, patterns such as [\Q\E] or [\E] or even [^\E] cause an error,
1341        because the ] is interpreted as the first data character and the
1342        terminating ] is not found. PCRE has been made compatible with Perl in this
1343        regard. Previously, it interpreted [\Q\E] as an empty class, and [\E] could
1344        cause memory overwriting.
1346    10. Like Perl, PCRE automatically breaks an unlimited repeat after an empty
1347        string has been matched (to stop an infinite loop). It was not recognizing
1348        a conditional subpattern that could match an empty string if that
1349        subpattern was within another subpattern. For example, it looped when
1350        trying to match  (((?(1)X|))*)  but it was OK with  ((?(1)X|)*)  where the
1351        condition was not nested. This bug has been fixed.
1353    12. A pattern like \X?\d or \P{L}?\d in non-UTF-8 mode could cause a backtrack
1354        past the start of the subject in the presence of bytes with the top bit
1355        set, for example "\x8aBCD".
1357    13. Added Perl 5.10 experimental backtracking controls (*FAIL), (*F), (*PRUNE),
1358        (*SKIP), (*THEN), (*COMMIT), and (*ACCEPT).
1360    14. Optimized (?!) to (*FAIL).
1362    15. Updated the test for a valid UTF-8 string to conform to the later RFC 3629.
1363        This restricts code points to be within the range 0 to 0x10FFFF, excluding
1364        the "low surrogate" sequence 0xD800 to 0xDFFF. Previously, PCRE allowed the
1365        full range 0 to 0x7FFFFFFF, as defined by RFC 2279. Internally, it still
1366        does: it's just the validity check that is more restrictive.
1368    16. Inserted checks for integer overflows during escape sequence (backslash)
1369        processing, and also fixed erroneous offset values for syntax errors during
1370        backslash processing.
1372    17. Fixed another case of looking too far back in non-UTF-8 mode (cf 12 above)
1373        for patterns like [\PPP\x8a]{1,}\x80 with the subject "A\x80".
1375    18. An unterminated class in a pattern like (?1)\c[ with a "forward reference"
1376        caused an overrun.
1378    19. A pattern like (?:[\PPa*]*){8,} which had an "extended class" (one with
1379        something other than just ASCII characters) inside a group that had an
1380        unlimited repeat caused a loop at compile time (while checking to see
1381        whether the group could match an empty string).
1383    20. Debugging a pattern containing \p or \P could cause a crash. For example,
1384        [\P{Any}] did so. (Error in the code for printing property names.)
1386    21. An orphan \E inside a character class could cause a crash.
1388    22. A repeated capturing bracket such as (A)? could cause a wild memory
1389        reference during compilation.
1391    23. There are several functions in pcre_compile() that scan along a compiled
1392        expression for various reasons (e.g. to see if it's fixed length for look
1393        behind). There were bugs in these functions when a repeated \p or \P was
1394        present in the pattern. These operators have additional parameters compared
1395        with \d, etc, and these were not being taken into account when moving along
1396        the compiled data. Specifically:
1398        (a) A item such as \p{Yi}{3} in a lookbehind was not treated as fixed
1399            length.
1401        (b) An item such as \pL+ within a repeated group could cause crashes or
1402            loops.
1404        (c) A pattern such as \p{Yi}+(\P{Yi}+)(?1) could give an incorrect
1405            "reference to non-existent subpattern" error.
1407        (d) A pattern like (\P{Yi}{2}\277)? could loop at compile time.
1409    24. A repeated \S or \W in UTF-8 mode could give wrong answers when multibyte
1410        characters were involved (for example /\S{2}/8g with "A\x{a3}BC").
1412    25. Using pcregrep in multiline, inverted mode (-Mv) caused it to loop.
1414    26. Patterns such as [\P{Yi}A] which include \p or \P and just one other
1415        character were causing crashes (broken optimization).
1417    27. Patterns such as (\P{Yi}*\277)* (group with possible zero repeat containing
1418        \p or \P) caused a compile-time loop.
1420    28. More problems have arisen in unanchored patterns when CRLF is a valid line
1421        break. For example, the unstudied pattern [\r\n]A does not match the string
1422        "\r\nA" because change 7.0/46 below moves the current point on by two
1423        characters after failing to match at the start. However, the pattern \nA
1424        *does* match, because it doesn't start till \n, and if [\r\n]A is studied,
1425        the same is true. There doesn't seem any very clean way out of this, but
1426        what I have chosen to do makes the common cases work: PCRE now takes note
1427        of whether there can be an explicit match for \r or \n anywhere in the
1428        pattern, and if so, 7.0/46 no longer applies. As part of this change,
1429        there's a new PCRE_INFO_HASCRORLF option for finding out whether a compiled
1430        pattern has explicit CR or LF references.
1432    29. Added (*CR) etc for changing newline setting at start of pattern.
1435    Version 7.2 19-Jun-07
1436    ---------------------
1438     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
1439        which is apparently normally available under Windows.
1441     2. Re-jig the pcregrep tests with different newline settings in an attempt
1442        to make them independent of the local environment's newline setting.
1444     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
1446     4. Some of the "internals" tests were previously cut out when the link size
1447        was not 2, because the output contained actual offsets. The recent new
1448        "Z" feature of pcretest means that these can be cut out, making the tests
1449        usable with all link sizes.
1451     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
1452        stack recursion. This gives a massive performance boost under BSD, but just
1453        a small improvement under Linux. However, it saves one field in the frame
1454        in all cases.
1456     6. Added more features from the forthcoming Perl 5.10:
1458        (a) (?-n) (where n is a string of digits) is a relative subroutine or
1459            recursion call. It refers to the nth most recently opened parentheses.
1461        (b) (?+n) is also a relative subroutine call; it refers to the nth next
1462            to be opened parentheses.
1464        (c) Conditions that refer to capturing parentheses can be specified
1465            relatively, for example, (?(-2)... or (?(+3)...
1467        (d) \K resets the start of the current match so that everything before
1468            is not part of it.
1470        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
1472        (f) \g{name} is another synonym - part of Perl 5.10's unification of
1473            reference syntax.
1475        (g) (?| introduces a group in which the numbering of parentheses in each
1476            alternative starts with the same number.
1478        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
1480     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
1483     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
1484        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
1485        for detecting groups that can match an empty string.
1487     9. A pattern with a very large number of alternatives (more than several
1488        hundred) was running out of internal workspace during the pre-compile
1489        phase, where pcre_compile() figures out how much memory will be needed. A
1490        bit of new cunning has reduced the workspace needed for groups with
1491        alternatives. The 1000-alternative test pattern now uses 12 bytes of
1492        workspace instead of running out of the 4096 that are available.
1494    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
1496    11. Applied patch from Google to remove an optimization that didn't quite work.
1497        The report of the bug said:
1499          pcrecpp::RE("a*").FullMatch("aaa") matches, while
1500          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
1501          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
1503    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
1504        it matched the wrong number of bytes.
1507    Version 7.1 24-Apr-07
1508    ---------------------
1510     1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
1511        that is more "standard", making use of automake and other Autotools. There
1512        is some re-arrangement of the files and adjustment of comments consequent
1513        on this.
1515     2. Part of the patch fixed a problem with the pcregrep tests. The test of -r
1516        for recursive directory scanning broke on some systems because the files
1517        are not scanned in any specific order and on different systems the order
1518        was different. A call to "sort" has been inserted into RunGrepTest for the
1519        approprate test as a short-term fix. In the longer term there may be an
1520        alternative.
1522     3. I had an email from Eric Raymond about problems translating some of PCRE's
1523        man pages to HTML (despite the fact that I distribute HTML pages, some
1524        people do their own conversions for various reasons). The problems
1525        concerned the use of low-level troff macros .br and .in. I have therefore
1526        removed all such uses from the man pages (some were redundant, some could
1527        be replaced by .nf/.fi pairs). The 132html script that I use to generate
1528        HTML has been updated to handle .nf/.fi and to complain if it encounters
1529        .br or .in.
1531     4. Updated comments in configure.ac that get placed in config.h.in and also
1532        arranged for config.h to be included in the distribution, with the name
1533        config.h.generic, for the benefit of those who have to compile without
1534        Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
1536     5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan
1537        Weber: (1) pcre_internal.h was missing some function renames; (2) updated
1538        makevp.bat for the current PCRE, using the additional files
1539        makevp_c.txt, makevp_l.txt, and pcregexp.pas.
1541     6. A Windows user reported a minor discrepancy with test 2, which turned out
1542        to be caused by a trailing space on an input line that had got lost in his
1543        copy. The trailing space was an accident, so I've just removed it.
1545     7. Add -Wl,-R... flags in pcre-config.in for *BSD* systems, as I'm told
1546        that is needed.
1548     8. Mark ucp_table (in ucptable.h) and ucp_gentype (in pcre_ucp_searchfuncs.c)
1549        as "const" (a) because they are and (b) because it helps the PHP
1550        maintainers who have recently made a script to detect big data structures
1551        in the php code that should be moved to the .rodata section. I remembered
1552        to update Builducptable as well, so it won't revert if ucptable.h is ever
1553        re-created.
1555     9. Added some extra #ifdef SUPPORT_UTF8 conditionals into pcretest.c,
1556        pcre_printint.src, pcre_compile.c, pcre_study.c, and pcre_tables.c, in
1557        order to be able to cut out the UTF-8 tables in the latter when UTF-8
1558        support is not required. This saves 1.5-2K of code, which is important in
1559        some applications.
1561        Later: more #ifdefs are needed in pcre_ord2utf8.c and pcre_valid_utf8.c
1562        so as not to refer to the tables, even though these functions will never be
1563        called when UTF-8 support is disabled. Otherwise there are problems with a
1564        shared library.
1566    10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:
1568        (a) It was defining its arguments as char * instead of void *.
1570        (b) It was assuming that all moves were upwards in memory; this was true
1571            a long time ago when I wrote it, but is no longer the case.
1573        The emulated memove() is provided for those environments that have neither
1574        memmove() nor bcopy(). I didn't think anyone used it these days, but that
1575        is clearly not the case, as these two bugs were recently reported.
1577    11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
1578        and Detrail to create the HTML documentation, the .txt form of the man
1579        pages, and it removes trailing spaces from listed files. It also creates
1580        pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter
1581        case, it wraps all the #defines with #ifndefs. This script should be run
1582        before "make dist".
1584    12. Fixed two fairly obscure bugs concerned with quantified caseless matching
1585        with Unicode property support.
1587        (a) For a maximizing quantifier, if the two different cases of the
1588            character were of different lengths in their UTF-8 codings (there are
1589            some cases like this - I found 11), and the matching function had to
1590            back up over a mixture of the two cases, it incorrectly assumed they
1591            were both the same length.
1593        (b) When PCRE was configured to use the heap rather than the stack for
1594            recursion during matching, it was not correctly preserving the data for
1595            the other case of a UTF-8 character when checking ahead for a match
1596            while processing a minimizing repeat. If the check also involved
1597            matching a wide character, but failed, corruption could cause an
1598            erroneous result when trying to check for a repeat of the original
1599            character.
1601    13. Some tidying changes to the testing mechanism:
1603        (a) The RunTest script now detects the internal link size and whether there
1604            is UTF-8 and UCP support by running ./pcretest -C instead of relying on
1605            values substituted by "configure". (The RunGrepTest script already did
1606            this for UTF-8.) The configure.ac script no longer substitutes the
1607            relevant variables.
1609        (b) The debugging options /B and /D in pcretest show the compiled bytecode
1610            with length and offset values. This means that the output is different
1611            for different internal link sizes. Test 2 is skipped for link sizes
1612            other than 2 because of this, bypassing the problem. Unfortunately,
1613            there was also a test in test 3 (the locale tests) that used /B and
1614            failed for link sizes other than 2. Rather than cut the whole test out,
1615            I have added a new /Z option to pcretest that replaces the length and
1616            offset values with spaces. This is now used to make test 3 independent
1617            of link size. (Test 2 will be tidied up later.)
1619    14. If erroroffset was passed as NULL to pcre_compile, it provoked a
1620        segmentation fault instead of returning the appropriate error message.
1622    15. In multiline mode when the newline sequence was set to "any", the pattern
1623        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
1624        This doesn't seem right; it now treats the CRLF combination as the line
1625        ending, and so does not match in that case. It's only a pattern such as ^$
1626        that would hit this one: something like ^ABC$ would have failed after \r
1627        and then tried again after \r\n.
1629    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
1630        in an attempt to make files that differ only in their line terminators
1631        compare equal. This works on Linux.
1633    17. Under certain error circumstances pcregrep might try to free random memory
1634        as it exited. This is now fixed, thanks to valgrind.
1636    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
1637        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
1638        was because its rules for how to advance for /g after matching an empty
1639        string at the end of a line did not allow for this case. They now check for
1640        it specially.
1642    20. pcretest is supposed to handle patterns and data of any length, by
1643        extending its buffers when necessary. It was getting this wrong when the
1644        buffer for a data line had to be extended.
1646    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
1647        CRLF as a newline sequence.
1649    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
1650        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
1651        I have nevertheless tidied it up.
1653    23. Added some casts to kill warnings from HP-UX ia64 compiler.
1655    24. Added a man page for pcre-config.
1658    Version 7.0 19-Dec-06
1659    ---------------------
1661     1. Fixed a signed/unsigned compiler warning in pcre_compile.c, shown up by
1662        moving to gcc 4.1.1.
1664     2. The -S option for pcretest uses setrlimit(); I had omitted to #include
1665        sys/time.h, which is documented as needed for this function. It doesn't
1666        seem to matter on Linux, but it showed up on some releases of OS X.
1668     3. It seems that there are systems where bytes whose values are greater than
1669        127 match isprint() in the "C" locale. The "C" locale should be the
1670        default when a C program starts up. In most systems, only ASCII printing
1671        characters match isprint(). This difference caused the output from pcretest
1672        to vary, making some of the tests fail. I have changed pcretest so that:
1674        (a) When it is outputting text in the compiled version of a pattern, bytes
1675            other than 32-126 are always shown as hex escapes.
1677        (b) When it is outputting text that is a matched part of a subject string,
1678            it does the same, unless a different locale has been set for the match
1679            (using the /L modifier). In this case, it uses isprint() to decide.
1681     4. Fixed a major bug that caused incorrect computation of the amount of memory
1682        required for a compiled pattern when options that changed within the
1683        pattern affected the logic of the preliminary scan that determines the
1684        length. The relevant options are -x, and -i in UTF-8 mode. The result was
1685        that the computed length was too small. The symptoms of this bug were
1686        either the PCRE error "internal error: code overflow" from pcre_compile(),
1687        or a glibc crash with a message such as "pcretest: free(): invalid next
1688        size (fast)". Examples of patterns that provoked this bug (shown in
1689        pcretest format) are:
1691          /(?-x: )/x
1692          /(?x)(?-x: \s*#\s*)/
1693          /((?i)[\x{c0}])/8
1694          /(?i:[\x{c0}])/8
1696        HOWEVER: Change 17 below makes this fix obsolete as the memory computation
1697        is now done differently.
1699     5. Applied patches from Google to: (a) add a QuoteMeta function to the C++
1700        wrapper classes; (b) implement a new function in the C++ scanner that is
1701        more efficient than the old way of doing things because it avoids levels of
1702        recursion in the regex matching; (c) add a paragraph to the documentation
1703        for the FullMatch() function.
1705     6. The escape sequence \n was being treated as whatever was defined as
1706        "newline". Not only was this contrary to the documentation, which states
1707        that \n is character 10 (hex 0A), but it also went horribly wrong when
1708        "newline" was defined as CRLF. This has been fixed.
1710     7. In pcre_dfa_exec.c the value of an unsigned integer (the variable called c)
1711        was being set to -1 for the "end of line" case (supposedly a value that no
1712        character can have). Though this value is never used (the check for end of
1713        line is "zero bytes in current character"), it caused compiler complaints.
1714        I've changed it to 0xffffffff.
1716     8. In pcre_version.c, the version string was being built by a sequence of
1717        C macros that, in the event of PCRE_PRERELEASE being defined as an empty
1718        string (as it is for production releases) called a macro with an empty
1719        argument. The C standard says the result of this is undefined. The gcc
1720        compiler treats it as an empty string (which was what was wanted) but it is
1721        reported that Visual C gives an error. The source has been hacked around to
1722        avoid this problem.
1724     9. On the advice of a Windows user, included <io.h> and <fcntl.h> in Windows
1725        builds of pcretest, and changed the call to _setmode() to use _O_BINARY
1726        instead of 0x8000. Made all the #ifdefs test both _WIN32 and WIN32 (not all
1727        of them did).
1729    10. Originally, pcretest opened its input and output without "b"; then I was
1730        told that "b" was needed in some environments, so it was added for release
1731        5.0 to both the input and output. (It makes no difference on Unix-like
1732        systems.) Later I was told that it is wrong for the input on Windows. I've
1733        now abstracted the modes into two macros, to make it easier to fiddle with
1734        them, and removed "b" from the input mode under Windows.
1736    11. Added pkgconfig support for the C++ wrapper library, libpcrecpp.
1738    12. Added -help and --help to pcretest as an official way of being reminded
1739        of the options.
1741    13. Removed some redundant semicolons after macro calls in pcrecpparg.h.in
1742        and pcrecpp.cc because they annoy compilers at high warning levels.
1744    14. A bit of tidying/refactoring in pcre_exec.c in the main bumpalong loop.
1746    15. Fixed an occurrence of == in configure.ac that should have been = (shell
1747        scripts are not C programs :-) and which was not noticed because it works
1748        on Linux.
1750    16. pcretest is supposed to handle any length of pattern and data line (as one
1751        line or as a continued sequence of lines) by extending its input buffer if
1752        necessary. This feature was broken for very long pattern lines, leading to
1753        a string of junk being passed to pcre_compile() if the pattern was longer
1754        than about 50K.
1756    17. I have done a major re-factoring of the way pcre_compile() computes the
1757        amount of memory needed for a compiled pattern. Previously, there was code
1758        that made a preliminary scan of the pattern in order to do this. That was
1759        OK when PCRE was new, but as the facilities have expanded, it has become
1760        harder and harder to keep it in step with the real compile phase, and there
1761        have been a number of bugs (see for example, 4 above). I have now found a
1762        cunning way of running the real compile function in a "fake" mode that
1763        enables it to compute how much memory it would need, while actually only
1764        ever using a few hundred bytes of working memory and without too many
1765        tests of the mode. This should make future maintenance and development
1766        easier. A side effect of this work is that the limit of 200 on the nesting
1767        depth of parentheses has been removed (though this was never a serious
1768        limitation, I suspect). However, there is a downside: pcre_compile() now
1769        runs more slowly than before (30% or more, depending on the pattern). I
1770        hope this isn't a big issue. There is no effect on runtime performance.
1772    18. Fixed a minor bug in pcretest: if a pattern line was not terminated by a
1773        newline (only possible for the last line of a file) and it was a
1774        pattern that set a locale (followed by /Lsomething), pcretest crashed.
1776    19. Added additional timing features to pcretest. (1) The -tm option now times
1777        matching only, not compiling. (2) Both -t and -tm can be followed, as a
1778        separate command line item, by a number that specifies the number of
1779        repeats to use when timing. The default is 50000; this gives better
1780        precision, but takes uncomfortably long for very large patterns.
1782    20. Extended pcre_study() to be more clever in cases where a branch of a
1783        subpattern has no definite first character. For example, (a*|b*)[cd] would
1784        previously give no result from pcre_study(). Now it recognizes that the
1785        first character must be a, b, c, or d.
1787    21. There was an incorrect error "recursive call could loop indefinitely" if
1788        a subpattern (or the entire pattern) that was being tested for matching an
1789        empty string contained only one non-empty item after a nested subpattern.
1790        For example, the pattern (?>\x{100}*)\d(?R) provoked this error
1791        incorrectly, because the \d was being skipped in the check.
1793    22. The pcretest program now has a new pattern option /B and a command line
1794        option -b, which is equivalent to adding /B to every pattern. This causes
1795        it to show the compiled bytecode, without the additional information that
1796        -d shows. The effect of -d is now the same as -b with -i (and similarly, /D
1797        is the same as /B/I).
1799    23. A new optimization is now able automatically to treat some sequences such
1800        as a*b as a*+b. More specifically, if something simple (such as a character
1801        or a simple class like \d) has an unlimited quantifier, and is followed by
1802        something that cannot possibly match the quantified thing, the quantifier
1803        is automatically "possessified".
1805    24. A recursive reference to a subpattern whose number was greater than 39
1806        went wrong under certain circumstances in UTF-8 mode. This bug could also
1807        have affected the operation of pcre_study().
1809    25. Realized that a little bit of performance could be had by replacing
1810        (c & 0xc0) == 0xc0 with c >= 0xc0 when processing UTF-8 characters.
1812    26. Timing data from pcretest is now shown to 4 decimal places instead of 3.
1814    27. Possessive quantifiers such as a++ were previously implemented by turning
1815        them into atomic groups such as ($>a+). Now they have their own opcodes,
1816        which improves performance. This includes the automatically created ones
1817        from 23 above.
1819    28. A pattern such as (?=(\w+))\1: which simulates an atomic group using a
1820        lookahead was broken if it was not anchored. PCRE was mistakenly expecting
1821        the first matched character to be a colon. This applied both to named and
1822        numbered groups.
1824    29. The ucpinternal.h header file was missing its idempotency #ifdef.
1826    30. I was sent a "project" file called libpcre.a.dev which I understand makes
1827        building PCRE on Windows easier, so I have included it in the distribution.
1829    31. There is now a check in pcretest against a ridiculously large number being
1830        returned by pcre_exec() or pcre_dfa_exec(). If this happens in a /g or /G
1831        loop, the loop is abandoned.
1833    32. Forward references to subpatterns in conditions such as (?(2)...) where
1834        subpattern 2 is defined later cause pcre_compile() to search forwards in
1835        the pattern for the relevant set of parentheses. This search went wrong
1836        when there were unescaped parentheses in a character class, parentheses
1837        escaped with \Q...\E, or parentheses in a #-comment in /x mode.
1839    33. "Subroutine" calls and backreferences were previously restricted to
1840        referencing subpatterns earlier in the regex. This restriction has now
1841        been removed.
1843    34. Added a number of extra features that are going to be in Perl 5.10. On the
1844        whole, these are just syntactic alternatives for features that PCRE had
1845        previously implemented using the Python syntax or my own invention. The
1846        other formats are all retained for compatibility.
1848        (a) Named groups can now be defined as (?<name>...) or (?'name'...) as well
1849            as (?P<name>...). The new forms, as well as being in Perl 5.10, are
1850            also .NET compatible.
1852        (b) A recursion or subroutine call to a named group can now be defined as
1853            (?&name) as well as (?P>name).
1855        (c) A backreference to a named group can now be defined as \k<name> or
1856            \k'name' as well as (?P=name). The new forms, as well as being in Perl
1857            5.10, are also .NET compatible.
1859        (d) A conditional reference to a named group can now use the syntax
1860            (?(<name>) or (?('name') as well as (?(name).
1862        (e) A "conditional group" of the form (?(DEFINE)...) can be used to define
1863            groups (named and numbered) that are never evaluated inline, but can be
1864            called as "subroutines" from elsewhere. In effect, the DEFINE condition
1865            is always false. There may be only one alternative in such a group.
1867        (f) A test for recursion can be given as (?(R1).. or (?(R&name)... as well
1868            as the simple (?(R). The condition is true only if the most recent
1869            recursion is that of the given number or name. It does not search out
1870            through the entire recursion stack.
1872        (g) The escape \gN or \g{N} has been added, where N is a positive or
1873            negative number, specifying an absolute or relative reference.
1875    35. Tidied to get rid of some further signed/unsigned compiler warnings and
1876        some "unreachable code" warnings.
1878    36. Updated the Unicode property tables to Unicode version 5.0.0. Amongst other
1879        things, this adds five new scripts.
1881    37. Perl ignores orphaned \E escapes completely. PCRE now does the same.
1882        There were also incompatibilities regarding the handling of \Q..\E inside
1883        character classes, for example with patterns like [\Qa\E-\Qz\E] where the
1884        hyphen was adjacent to \Q or \E. I hope I've cleared all this up now.
1886    38. Like Perl, PCRE detects when an indefinitely repeated parenthesized group
1887        matches an empty string, and forcibly breaks the loop. There were bugs in
1888        this code in non-simple cases. For a pattern such as  ^(a()*)*  matched
1889        against  aaaa  the result was just "a" rather than "aaaa", for example. Two
1890        separate and independent bugs (that affected different cases) have been
1891        fixed.
1893    39. Refactored the code to abolish the use of different opcodes for small
1894        capturing bracket numbers. This is a tidy that I avoided doing when I
1895        removed the limit on the number of capturing brackets for 3.5 back in 2001.
1896        The new approach is not only tidier, it makes it possible to reduce the
1897        memory needed to fix the previous bug (38).
1899    40. Implemented PCRE_NEWLINE_ANY to recognize any of the Unicode newline
1900        sequences (http://unicode.org/unicode/reports/tr18/) as "newline" when
1901        processing dot, circumflex, or dollar metacharacters, or #-comments in /x
1902        mode.
1904    41. Add \R to match any Unicode newline sequence, as suggested in the Unicode
1905        report.
1907    42. Applied patch, originally from Ari Pollak, modified by Google, to allow
1908        copy construction and assignment in the C++ wrapper.
1910    43. Updated pcregrep to support "--newline=any". In the process, I fixed a
1911        couple of bugs that could have given wrong results in the "--newline=crlf"
1912        case.
1914    44. Added a number of casts and did some reorganization of signed/unsigned int
1915        variables following suggestions from Dair Grant. Also renamed the variable
1916        "this" as "item" because it is a C++ keyword.
1918    45. Arranged for dftables to add
1920          #include "pcre_internal.h"
1922        to pcre_chartables.c because without it, gcc 4.x may remove the array
1923        definition from the final binary if PCRE is built into a static library and
1924        dead code stripping is activated.
1926    46. For an unanchored pattern, if a match attempt fails at the start of a
1927        newline sequence, and the newline setting is CRLF or ANY, and the next two
1928        characters are CRLF, advance by two characters instead of one.
1931    Version 6.7 04-Jul-06
1932    ---------------------
1934     1. In order to handle tests when input lines are enormously long, pcretest has
1935        been re-factored so that it automatically extends its buffers when
1936        necessary. The code is crude, but this _is_ just a test program. The
1937        default size has been increased from 32K to 50K.
1939     2. The code in pcre_study() was using the value of the re argument before
1940        testing it for NULL. (Of course, in any sensible call of the function, it
1941        won't be NULL.)
1943     3. The memmove() emulation function in pcre_internal.h, which is used on
1944        systems that lack both memmove() and bcopy() - that is, hardly ever -
1945        was missing a "static" storage class specifier.
1947     4. When UTF-8 mode was not set, PCRE looped when compiling certain patterns
1948        containing an extended class (one that cannot be represented by a bitmap
1949        because it contains high-valued characters or Unicode property items, e.g.
1950        [\pZ]). Almost always one would set UTF-8 mode when processing such a
1951        pattern, but PCRE should not loop if you do not (it no longer does).
1952        [Detail: two cases were found: (a) a repeated subpattern containing an
1953        extended class; (b) a recursive reference to a subpattern that followed a
1954        previous extended class. It wasn't skipping over the extended class
1955        correctly when UTF-8 mode was not set.]
1957     5. A negated single-character class was not being recognized as fixed-length
1958        in lookbehind assertions such as (?<=[^f]), leading to an incorrect
1959        compile error "lookbehind assertion is not fixed length".
1961     6. The RunPerlTest auxiliary script was showing an unexpected difference
1962        between PCRE and Perl for UTF-8 tests. It turns out that it is hard to
1963        write a Perl script that can interpret lines of an input file either as
1964        byte characters or as UTF-8, which is what "perltest" was being required to
1965        do for the non-UTF-8 and UTF-8 tests, respectively. Essentially what you
1966        can't do is switch easily at run time between having the "use utf8;" pragma
1967        or not. In the end, I fudged it by using the RunPerlTest script to insert
1968        "use utf8;" explicitly for the UTF-8 tests.
1970     7. In multiline (/m) mode, PCRE was matching ^ after a terminating newline at
1971        the end of the subject string, contrary to the documentation and to what
1972        Perl does. This was true of both matching functions. Now it matches only at
1973        the start of the subject and immediately after *internal* newlines.
1975     8. A call of pcre_fullinfo() from pcretest to get the option bits was passing
1976        a pointer to an int instead of a pointer to an unsigned long int. This
1977        caused problems on 64-bit systems.
1979     9. Applied a patch from the folks at Google to pcrecpp.cc, to fix "another
1980        instance of the 'standard' template library not being so standard".
1982    10. There was no check on the number of named subpatterns nor the maximum
1983        length of a subpattern name. The product of these values is used to compute
1984        the size of the memory block for a compiled pattern. By supplying a very
1985        long subpattern name and a large number of named subpatterns, the size
1986        computation could be caused to overflow. This is now prevented by limiting
1987        the length of names to 32 characters, and the number of named subpatterns
1988        to 10,000.
1990    11. Subpatterns that are repeated with specific counts have to be replicated in
1991        the compiled pattern. The size of memory for this was computed from the
1992        length of the subpattern and the repeat count. The latter is limited to
1993        65535, but there was no limit on the former, meaning that integer overflow
1994        could in principle occur. The compiled length of a repeated subpattern is
1995        now limited to 30,000 bytes in order to prevent this.
1997    12. Added the optional facility to have named substrings with the same name.
1999    13. Added the ability to use a named substring as a condition, using the
2000        Python syntax: (?(name)yes|no). This overloads (?(R)... and names that
2001        are numbers (not recommended). Forward references are permitted.
2003    14. Added forward references in named backreferences (if you see what I mean).
2005    15. In UTF-8 mode, with the PCRE_DOTALL option set, a quantified dot in the
2006        pattern could run off the end of the subject. For example, the pattern
2007        "(?s)(.{1,5})"8 did this with the subject "ab".
2009    16. If PCRE_DOTALL or PCRE_MULTILINE were set, pcre_dfa_exec() behaved as if
2010        PCRE_CASELESS was set when matching characters that were quantified with ?
2011        or *.
2013    17. A character class other than a single negated character that had a minimum
2014        but no maximum quantifier - for example [ab]{6,} - was not handled
2015        correctly by pce_dfa_exec(). It would match only one character.
2017    18. A valid (though odd) pattern that looked like a POSIX character
2018        class but used an invalid character after [ (for example [[,abc,]]) caused
2019        pcre_compile() to give the error "Failed: internal error: code overflow" or
2020        in some cases to crash with a glibc free() error. This could even happen if
2021        the pattern terminated after [[ but there just happened to be a sequence of
2022        letters, a binary zero, and a closing ] in the memory that followed.
2024    19. Perl's treatment of octal escapes in the range \400 to \777 has changed
2025        over the years. Originally (before any Unicode support), just the bottom 8
2026        bits were taken. Thus, for example, \500 really meant \100. Nowadays the
2027        output from "man perlunicode" includes this:
2029          The regular expression compiler produces polymorphic opcodes.  That
2030          is, the pattern adapts to the data and automatically switches to
2031          the Unicode character scheme when presented with Unicode data--or
2032          instead uses a traditional byte scheme when presented with byte
2033          data.
2035        Sadly, a wide octal escape does not cause a switch, and in a string with
2036        no other multibyte characters, these octal escapes are treated as before.
2037        Thus, in Perl, the pattern  /\500/ actually matches \100 but the pattern
2038        /\500|\x{1ff}/ matches \500 or \777 because the whole thing is treated as a
2039        Unicode string.
2041        I have not perpetrated such confusion in PCRE. Up till now, it took just
2042        the bottom 8 bits, as in old Perl. I have now made octal escapes with
2043        values greater than \377 illegal in non-UTF-8 mode. In UTF-8 mode they
2044        translate to the appropriate multibyte character.
2046    29. Applied some refactoring to reduce the number of warnings from Microsoft
2047        and Borland compilers. This has included removing the fudge introduced
2048        seven years ago for the OS/2 compiler (see 2.02/2 below) because it caused
2049        a warning about an unused variable.
2051    21. PCRE has not included VT (character 0x0b) in the set of whitespace
2052        characters since release 4.0, because Perl (from release 5.004) does not.
2053        [Or at least, is documented not to: some releases seem to be in conflict
2054        with the documentation.] However, when a pattern was studied with
2055        pcre_study() and all its branches started with \s, PCRE still included VT
2056        as a possible starting character. Of course, this did no harm; it just
2057        caused an unnecessary match attempt.
2059    22. Removed a now-redundant internal flag bit that recorded the fact that case
2060        dependency changed within the pattern. This was once needed for "required
2061        byte" processing, but is no longer used. This recovers a now-scarce options
2062        bit. Also moved the least significant internal flag bit to the most-
2063        significant bit of the word, which was not previously used (hangover from
2064        the days when it was an int rather than a uint) to free up another bit for
2065        the future.
2067    23. Added support for CRLF line endings as well as CR and LF. As well as the
2068        default being selectable at build time, it can now be changed at runtime
2069        via the PCRE_NEWLINE_xxx flags. There are now options for pcregrep to
2070        specify that it is scanning data with non-default line endings.
2072    24. Changed the definition of CXXLINK to make it agree with the definition of
2073        LINK in the Makefile, by replacing LDFLAGS to CXXFLAGS.
2075    25. Applied Ian Taylor's patches to avoid using another stack frame for tail
2076        recursions. This makes a big different to stack usage for some patterns.
2078    26. If a subpattern containing a named recursion or subroutine reference such
2079        as (?P>B) was quantified, for example (xxx(?P>B)){3}, the calculation of
2080        the space required for the compiled pattern went wrong and gave too small a
2081        value. Depending on the environment, this could lead to "Failed: internal
2082        error: code overflow at offset 49" or "glibc detected double free or
2083        corruption" errors.
2085    27. Applied patches from Google (a) to support the new newline modes and (b) to
2086        advance over multibyte UTF-8 characters in GlobalReplace.
2088    28. Change free() to pcre_free() in pcredemo.c. Apparently this makes a
2089        difference for some implementation of PCRE in some Windows version.
2091    29. Added some extra testing facilities to pcretest:
2093        \q<number>   in a data line sets the "match limit" value
2094        \Q<number>   in a data line sets the "match recursion limt" value
2095        -S <number>  sets the stack size, where <number> is in megabytes
2097        The -S option isn't available for Windows.
2100    Version 6.6 06-Feb-06
2101    ---------------------
2103     1. Change 16(a) for 6.5 broke things, because PCRE_DATA_SCOPE was not defined
2104        in pcreposix.h. I have copied the definition from pcre.h.
2106     2. Change 25 for 6.5 broke compilation in a build directory out-of-tree
2107        because pcre.h is no longer a built file.
2109     3. Added Jeff Friedl's additional debugging patches to pcregrep. These are
2110        not normally included in the compiled code.
2113  Version 6.5 01-Feb-06  Version 6.5 01-Feb-06
2114  ---------------------  ---------------------

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