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

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