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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.1 05-Mar-07  Version 7.7 05-Mar-08
5  ---------------------  ---------------------
6    
7   1. Applied Bob Rossi and Daniel G's patches to convert the build system to one  1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
8      that is more "standard", making use of automake and other autotools.      a string to a long long, pretend we don't even have a long long." This is
9        done by checking for the strtoq, strtoll, and _strtoi64 functions.
10    
11    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
12        pre-7.6 versions, which defined a global no_arg variable instead of putting
13        it in the RE class. (See also #8 below.)
14    
15    3.  Remove a line of dead code, identified by coverity and reported by Nuno
16        Lopes.
17    
18    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
19    
20        (1) The include/exclude patterns were being applied to the whole pathnames
21            of files, instead of just to the final components.
22    
23        (2) If there was more than one level of directory, the subdirectories were
24            skipped unless they satisfied the include/exclude conditions. This is
25            inconsistent with GNU grep (and could even be seen as contrary to the
26            pcregrep specification - which I improved to make it absolutely clear).
27            The action now is always to scan all levels of directory, and just
28            apply the include/exclude patterns to regular files.
29    
30    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
31        --exclude_dir in the tests to avoid scanning .svn directories.
32    
33    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
34        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
35        doesn't support NULs in patterns.
36    
37    7.  Added some missing "const"s to declarations of static tables in
38        pcre_compile.c and pcre_dfa_exec.c.
39    
40    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
41        caused by fix #2  above. (Subsequently also a second patch to fix the
42        first patch. And a third patch - this was a messy problem.)
43    
44    9.  Applied Craig's patch to remove the use of push_back().
45    
46    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
47        matching function regexec().
48    
49    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
50        which, however, unlike Perl's \g{...}, are subroutine calls, not back
51        references. PCRE supports relative numbers with this syntax (I don't think
52        Oniguruma does).
53    
54    12. Previously, a group with a zero repeat such as (...){0} was completely
55        omitted from the compiled regex. However, this means that if the group
56        was called as a subroutine from elsewhere in the pattern, things went wrong
57        (an internal error was given). Such groups are now left in the compiled
58        pattern, with a new opcode that causes them to be skipped at execution
59        time.
60    
61    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
62        to the way PCRE behaves:
63    
64        (a) A lone ] character is dis-allowed (Perl treats it as data).
65    
66        (b) A back reference to an unmatched subpattern matches an empty string
67            (Perl fails the current match path).
68    
69        (c) A data ] in a character class must be notated as \] because if the
70            first data character in a class is ], it defines an empty class. (In
71            Perl it is not possible to have an empty class.) The empty class []
72            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
73            The negative empty class [^] matches any one character, independently
74            of the DOTALL setting.
75    
76    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
77        non-existent subpattern following a character class starting with ']' and
78        containing () gave an internal compiling error instead of "reference to
79        non-existent subpattern". Fortunately, when the pattern did exist, the
80        compiled code was correct. (When scanning forwards to check for the
81        existencd of the subpattern, it was treating the data ']' as terminating
82        the class, so got the count wrong. When actually compiling, the reference
83        was subsequently set up correctly.)
84    
85    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
86        it was being rejected as not supported by pcre_dfa_exec(), even though
87        other assertions are supported. I have made pcre_dfa_exec() support
88        (*FAIL).
89    
90    
91    Version 7.6 28-Jan-08
92    ---------------------
93    
94    1.  A character class containing a very large number of characters with
95        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
96        overflow.
97    
98    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
99        HAVE_LONG_LONG is not defined.
100    
101    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
102        bring them up to date and include new features. This patch includes:
103    
104        - Fixed PH's badly added libz and libbz2 support.
105        - Fixed a problem with static linking.
106        - Added pcredemo. [But later removed - see 7 below.]
107        - Fixed dftables problem and added an option.
108        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
109            HAVE_LONG_LONG.
110        - Added readline support for pcretest.
111        - Added an listing of the option settings after cmake has run.
112    
113    4.  A user submitted a patch to Makefile that makes it easy to create
114        "pcre.dll" under mingw when using Configure/Make. I added stuff to
115        Makefile.am that cause it to include this special target, without
116        affecting anything else. Note that the same mingw target plus all
117        the other distribution libraries and programs are now supported
118        when configuring with CMake (see 6 below) instead of with
119        Configure/Make.
120    
121    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
122        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
123        exported in the Windows port". It has not yet been confirmed that the patch
124        solves the problem, but it does no harm.
125    
126    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
127        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
128        with CMake, and also correct the comment about stack recursion.
129    
130    7.  Remove the automatic building of pcredemo from the ./configure system and
131        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
132        of a program that users should build themselves after PCRE is installed, so
133        building it automatically is not really right. What is more, it gave
134        trouble in some build environments.
135    
136    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
137    
138    
139    Version 7.5 10-Jan-08
140    ---------------------
141    
142    1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
143        values in parens when parsing an RE using the C++ wrapper."
144    
145    2.  Negative specials like \S did not work in character classes in UTF-8 mode.
146        Characters greater than 255 were excluded from the class instead of being
147        included.
148    
149    3.  The same bug as (2) above applied to negated POSIX classes such as
150        [:^space:].
151    
152    4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
153        defined or documented. It seems to have been a typo for PCRE_STATIC, so
154        I have changed it.
155    
156    5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
157        first named subpattern) and a construct such as (?&a) would reference the
158        first named subpattern whose name started with "a" (in other words, the
159        length check was missing). Both these problems are fixed. "Subpattern name
160        expected" is now given for (?&) (a zero-length name), and this patch also
161        makes it give the same error for \k'' (previously it complained that that
162        was a reference to a non-existent subpattern).
163    
164    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
165        this is right because (?- can be followed by option settings as well as by
166        digits. I have, however, made the messages clearer.
167    
168    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
169        than the number used in the conditional) now cause a compile-time error.
170        This is actually not compatible with Perl, which accepts such patterns, but
171        treats the conditional as always being FALSE (as PCRE used to), but it
172        seems to me that giving a diagnostic is better.
173    
174    8.  Change "alphameric" to the more common word "alphanumeric" in comments
175        and messages.
176    
177    9.  Fix two occurrences of "backslash" in comments that should have been
178        "backspace".
179    
180    10. Remove two redundant lines of code that can never be obeyed (their function
181        was moved elsewhere).
182    
183    11. The program that makes PCRE's Unicode character property table had a bug
184        which caused it to generate incorrect table entries for sequences of
185        characters that have the same character type, but are in different scripts.
186        It amalgamated them into a single range, with the script of the first of
187        them. In other words, some characters were in the wrong script. There were
188        thirteen such cases, affecting characters in the following ranges:
189    
190          U+002b0 - U+002c1
191          U+0060c - U+0060d
192          U+0061e - U+00612
193          U+0064b - U+0065e
194          U+0074d - U+0076d
195          U+01800 - U+01805
196          U+01d00 - U+01d77
197          U+01d9b - U+01dbf
198          U+0200b - U+0200f
199          U+030fc - U+030fe
200          U+03260 - U+0327f
201          U+0fb46 - U+0fbb1
202          U+10450 - U+1049d
203    
204    12. The -o option (show only the matching part of a line) for pcregrep was not
205        compatible with GNU grep in that, if there was more than one match in a
206        line, it showed only the first of them. It now behaves in the same way as
207        GNU grep.
208    
209    13. If the -o and -v options were combined for pcregrep, it printed a blank
210        line for every non-matching line. GNU grep prints nothing, and pcregrep now
211        does the same. The return code can be used to tell if there were any
212        non-matching lines.
213    
214    14. Added --file-offsets and --line-offsets to pcregrep.
215    
216    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
217        infinitely looping recursion. The bug was that positive lookaheads were not
218        being skipped when checking for a possible empty match (negative lookaheads
219        and both kinds of lookbehind were skipped).
220    
221    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
222        inclusion of <windows.h> to before rather than after the definition of
223        INVALID_FILE_ATTRIBUTES (patch from David Byron).
224    
225    17. Specifying a possessive quantifier with a specific limit for a Unicode
226        character property caused pcre_compile() to compile bad code, which led at
227        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
228        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
229        caused the error; without that there was no problem.
230    
231    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
232    
233    19. Added --enable-pcretest-libreadline.
234    
235    20. In pcrecpp.cc, the variable 'count' was incremented twice in
236        RE::GlobalReplace(). As a result, the number of replacements returned was
237        double what it should be. I removed one of the increments, but Craig sent a
238        later patch that removed the other one (the right fix) and added unit tests
239        that check the return values (which was not done before).
240    
241    21. Several CMake things:
242    
243        (1) Arranged that, when cmake is used on Unix, the libraries end up with
244            the names libpcre and libpcreposix, not just pcre and pcreposix.
245    
246        (2) The above change means that pcretest and pcregrep are now correctly
247            linked with the newly-built libraries, not previously installed ones.
248    
249        (3) Added PCRE_SUPPORT_LIBREADLINE, PCRE_SUPPORT_LIBZ, PCRE_SUPPORT_LIBBZ2.
250    
251    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
252        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
253        UTF-8 newline character). The key issue is that the pattern starts .*;
254        this means that the match must be either at the beginning, or after a
255        newline. The bug was in the code for advancing after a failed match and
256        checking that the new position followed a newline. It was not taking
257        account of UTF-8 characters correctly.
258    
259    23. PCRE was behaving differently from Perl in the way it recognized POSIX
260        character classes. PCRE was not treating the sequence [:...:] as a
261        character class unless the ... were all letters. Perl, however, seems to
262        allow any characters between [: and :], though of course it rejects as
263        unknown any "names" that contain non-letters, because all the known class
264        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
265        for example, whereas PCRE did not - it did not recognize a POSIX character
266        class. This seemed a bit dangerous, so the code has been changed to be
267        closer to Perl. The behaviour is not identical to Perl, because PCRE will
268        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
269        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
270        Perl does, and where it didn't before.
271    
272    24. Rewrite so as to remove the single use of %n from pcregrep because in some
273        Windows environments %n is disabled by default.
274    
275    
276    Version 7.4 21-Sep-07
277    ---------------------
278    
279    1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This
280        means that a class such as [\s] counted as "explicit reference to CR or
281        LF". That isn't really right - the whole point of the change was to try to
282        help when there was an actual mention of one of the two characters. So now
283        the change happens only if \r or \n (or a literal CR or LF) character is
284        encountered.
285    
286    2.  The 32-bit options word was also used for 6 internal flags, but the numbers
287        of both had grown to the point where there were only 3 bits left.
288        Fortunately, there was spare space in the data structure, and so I have
289        moved the internal flags into a new 16-bit field to free up more option
290        bits.
291    
292    3.  The appearance of (?J) at the start of a pattern set the DUPNAMES option,
293        but did not set the internal JCHANGED flag - either of these is enough to
294        control the way the "get" function works - but the PCRE_INFO_JCHANGED
295        facility is supposed to tell if (?J) was ever used, so now (?J) at the
296        start sets both bits.
297    
298    4.  Added options (at build time, compile time, exec time) to change \R from
299        matching any Unicode line ending sequence to just matching CR, LF, or CRLF.
300    
301    5.  doc/pcresyntax.html was missing from the distribution.
302    
303    6.  Put back the definition of PCRE_ERROR_NULLWSLIMIT, for backward
304        compatibility, even though it is no longer used.
305    
306    7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and
307        strtoull to pcrecpp.cc to select the available functions in WIN32 when the
308        windows.h file is present (where different names are used). [This was
309        reversed later after testing - see 16 below.]
310    
311    8.  Changed all #include <config.h> to #include "config.h". There were also
312        some further <pcre.h> cases that I changed to "pcre.h".
313    
314    9.  When pcregrep was used with the --colour option, it missed the line ending
315        sequence off the lines that it output.
316    
317    10. It was pointed out to me that arrays of string pointers cause lots of
318        relocations when a shared library is dynamically loaded. A technique of
319        using a single long string with a table of offsets can drastically reduce
320        these. I have refactored PCRE in four places to do this. The result is
321        dramatic:
322    
323          Originally:                          290
324          After changing UCP table:            187
325          After changing error message table:   43
326          After changing table of "verbs"       36
327          After changing table of Posix names   22
328    
329        Thanks to the folks working on Gregex for glib for this insight.
330    
331    11. --disable-stack-for-recursion caused compiling to fail unless -enable-
332        unicode-properties was also set.
333    
334    12. Updated the tests so that they work when \R is defaulted to ANYCRLF.
335    
336    13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously
337        checked only for CRLF.
338    
339    14. Added casts to pcretest.c to avoid compiler warnings.
340    
341    15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
342    
343    16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
344        and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
345        entirely. This removes changes made in 7 above.
346    
347    17. The CMake files have been updated, and there is now more information about
348        building with CMake in the NON-UNIX-USE document.
349    
350    
351    Version 7.3 28-Aug-07
352    ---------------------
353    
354     1. In the rejigging of the build system that eventually resulted in 7.1, the
355        line "#include <pcre.h>" was included in pcre_internal.h. The use of angle
356        brackets there is not right, since it causes compilers to look for an
357        installed pcre.h, not the version that is in the source that is being
358        compiled (which of course may be different). I have changed it back to:
359    
360          #include "pcre.h"
361    
362        I have a vague recollection that the change was concerned with compiling in
363        different directories, but in the new build system, that is taken care of
364        by the VPATH setting the Makefile.
365    
366     2. The pattern .*$ when run in not-DOTALL UTF-8 mode with newline=any failed
367        when the subject happened to end in the byte 0x85 (e.g. if the last
368        character was \x{1ec5}). *Character* 0x85 is one of the "any" newline
369        characters but of course it shouldn't be taken as a newline when it is part
370        of another character. The bug was that, for an unlimited repeat of . in
371        not-DOTALL UTF-8 mode, PCRE was advancing by bytes rather than by
372        characters when looking for a newline.
373    
374     3. A small performance improvement in the DOTALL UTF-8 mode .* case.
375    
376     4. Debugging: adjusted the names of opcodes for different kinds of parentheses
377        in debug output.
378    
379     5. Arrange to use "%I64d" instead of "%lld" and "%I64u" instead of "%llu" for
380        long printing in the pcrecpp unittest when running under MinGW.
381    
382     6. ESC_K was left out of the EBCDIC table.
383    
384     7. Change 7.0/38 introduced a new limit on the number of nested non-capturing
385        parentheses; I made it 1000, which seemed large enough. Unfortunately, the
386        limit also applies to "virtual nesting" when a pattern is recursive, and in
387        this case 1000 isn't so big. I have been able to remove this limit at the
388        expense of backing off one optimization in certain circumstances. Normally,
389        when pcre_exec() would call its internal match() function recursively and
390        immediately return the result unconditionally, it uses a "tail recursion"
391        feature to save stack. However, when a subpattern that can match an empty
392        string has an unlimited repetition quantifier, it no longer makes this
393        optimization. That gives it a stack frame in which to save the data for
394        checking that an empty string has been matched. Previously this was taken
395        from the 1000-entry workspace that had been reserved. So now there is no
396        explicit limit, but more stack is used.
397    
398     8. Applied Daniel's patches to solve problems with the import/export magic
399        syntax that is required for Windows, and which was going wrong for the
400        pcreposix and pcrecpp parts of the library. These were overlooked when this
401        problem was solved for the main library.
402    
403     9. There were some crude static tests to avoid integer overflow when computing
404        the size of patterns that contain repeated groups with explicit upper
405        limits. As the maximum quantifier is 65535, the maximum group length was
406        set at 30,000 so that the product of these two numbers did not overflow a
407        32-bit integer. However, it turns out that people want to use groups that
408        are longer than 30,000 bytes (though not repeat them that many times).
409        Change 7.0/17 (the refactoring of the way the pattern size is computed) has
410        made it possible to implement the integer overflow checks in a much more
411        dynamic way, which I have now done. The artificial limitation on group
412        length has been removed - we now have only the limit on the total length of
413        the compiled pattern, which depends on the LINK_SIZE setting.
414    
415    10. Fixed a bug in the documentation for get/copy named substring when
416        duplicate names are permitted. If none of the named substrings are set, the
417        functions return PCRE_ERROR_NOSUBSTRING (7); the doc said they returned an
418        empty string.
419    
420    11. Because Perl interprets \Q...\E at a high level, and ignores orphan \E
421        instances, patterns such as [\Q\E] or [\E] or even [^\E] cause an error,
422        because the ] is interpreted as the first data character and the
423        terminating ] is not found. PCRE has been made compatible with Perl in this
424        regard. Previously, it interpreted [\Q\E] as an empty class, and [\E] could
425        cause memory overwriting.
426    
427    10. Like Perl, PCRE automatically breaks an unlimited repeat after an empty
428        string has been matched (to stop an infinite loop). It was not recognizing
429        a conditional subpattern that could match an empty string if that
430        subpattern was within another subpattern. For example, it looped when
431        trying to match  (((?(1)X|))*)  but it was OK with  ((?(1)X|)*)  where the
432        condition was not nested. This bug has been fixed.
433    
434    12. A pattern like \X?\d or \P{L}?\d in non-UTF-8 mode could cause a backtrack
435        past the start of the subject in the presence of bytes with the top bit
436        set, for example "\x8aBCD".
437    
438    13. Added Perl 5.10 experimental backtracking controls (*FAIL), (*F), (*PRUNE),
439        (*SKIP), (*THEN), (*COMMIT), and (*ACCEPT).
440    
441    14. Optimized (?!) to (*FAIL).
442    
443    15. Updated the test for a valid UTF-8 string to conform to the later RFC 3629.
444        This restricts code points to be within the range 0 to 0x10FFFF, excluding
445        the "low surrogate" sequence 0xD800 to 0xDFFF. Previously, PCRE allowed the
446        full range 0 to 0x7FFFFFFF, as defined by RFC 2279. Internally, it still
447        does: it's just the validity check that is more restrictive.
448    
449    16. Inserted checks for integer overflows during escape sequence (backslash)
450        processing, and also fixed erroneous offset values for syntax errors during
451        backslash processing.
452    
453    17. Fixed another case of looking too far back in non-UTF-8 mode (cf 12 above)
454        for patterns like [\PPP\x8a]{1,}\x80 with the subject "A\x80".
455    
456    18. An unterminated class in a pattern like (?1)\c[ with a "forward reference"
457        caused an overrun.
458    
459    19. A pattern like (?:[\PPa*]*){8,} which had an "extended class" (one with
460        something other than just ASCII characters) inside a group that had an
461        unlimited repeat caused a loop at compile time (while checking to see
462        whether the group could match an empty string).
463    
464    20. Debugging a pattern containing \p or \P could cause a crash. For example,
465        [\P{Any}] did so. (Error in the code for printing property names.)
466    
467    21. An orphan \E inside a character class could cause a crash.
468    
469    22. A repeated capturing bracket such as (A)? could cause a wild memory
470        reference during compilation.
471    
472    23. There are several functions in pcre_compile() that scan along a compiled
473        expression for various reasons (e.g. to see if it's fixed length for look
474        behind). There were bugs in these functions when a repeated \p or \P was
475        present in the pattern. These operators have additional parameters compared
476        with \d, etc, and these were not being taken into account when moving along
477        the compiled data. Specifically:
478    
479        (a) A item such as \p{Yi}{3} in a lookbehind was not treated as fixed
480            length.
481    
482        (b) An item such as \pL+ within a repeated group could cause crashes or
483            loops.
484    
485        (c) A pattern such as \p{Yi}+(\P{Yi}+)(?1) could give an incorrect
486            "reference to non-existent subpattern" error.
487    
488        (d) A pattern like (\P{Yi}{2}\277)? could loop at compile time.
489    
490    24. A repeated \S or \W in UTF-8 mode could give wrong answers when multibyte
491        characters were involved (for example /\S{2}/8g with "A\x{a3}BC").
492    
493    25. Using pcregrep in multiline, inverted mode (-Mv) caused it to loop.
494    
495    26. Patterns such as [\P{Yi}A] which include \p or \P and just one other
496        character were causing crashes (broken optimization).
497    
498    27. Patterns such as (\P{Yi}*\277)* (group with possible zero repeat containing
499        \p or \P) caused a compile-time loop.
500    
501    28. More problems have arisen in unanchored patterns when CRLF is a valid line
502        break. For example, the unstudied pattern [\r\n]A does not match the string
503        "\r\nA" because change 7.0/46 below moves the current point on by two
504        characters after failing to match at the start. However, the pattern \nA
505        *does* match, because it doesn't start till \n, and if [\r\n]A is studied,
506        the same is true. There doesn't seem any very clean way out of this, but
507        what I have chosen to do makes the common cases work: PCRE now takes note
508        of whether there can be an explicit match for \r or \n anywhere in the
509        pattern, and if so, 7.0/46 no longer applies. As part of this change,
510        there's a new PCRE_INFO_HASCRORLF option for finding out whether a compiled
511        pattern has explicit CR or LF references.
512    
513    29. Added (*CR) etc for changing newline setting at start of pattern.
514    
515    
516    Version 7.2 19-Jun-07
517    ---------------------
518    
519     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
520        which is apparently normally available under Windows.
521    
522     2. Re-jig the pcregrep tests with different newline settings in an attempt
523        to make them independent of the local environment's newline setting.
524    
525     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
526    
527     4. Some of the "internals" tests were previously cut out when the link size
528        was not 2, because the output contained actual offsets. The recent new
529        "Z" feature of pcretest means that these can be cut out, making the tests
530        usable with all link sizes.
531    
532     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
533        stack recursion. This gives a massive performance boost under BSD, but just
534        a small improvement under Linux. However, it saves one field in the frame
535        in all cases.
536    
537     6. Added more features from the forthcoming Perl 5.10:
538    
539        (a) (?-n) (where n is a string of digits) is a relative subroutine or
540            recursion call. It refers to the nth most recently opened parentheses.
541    
542        (b) (?+n) is also a relative subroutine call; it refers to the nth next
543            to be opened parentheses.
544    
545        (c) Conditions that refer to capturing parentheses can be specified
546            relatively, for example, (?(-2)... or (?(+3)...
547    
548        (d) \K resets the start of the current match so that everything before
549            is not part of it.
550    
551        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
552    
553        (f) \g{name} is another synonym - part of Perl 5.10's unification of
554            reference syntax.
555    
556        (g) (?| introduces a group in which the numbering of parentheses in each
557            alternative starts with the same number.
558    
559        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
560    
561     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
562        PCRE_INFO_JCHANGED.
563    
564     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
565        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
566        for detecting groups that can match an empty string.
567    
568     9. A pattern with a very large number of alternatives (more than several
569        hundred) was running out of internal workspace during the pre-compile
570        phase, where pcre_compile() figures out how much memory will be needed. A
571        bit of new cunning has reduced the workspace needed for groups with
572        alternatives. The 1000-alternative test pattern now uses 12 bytes of
573        workspace instead of running out of the 4096 that are available.
574    
575    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
576    
577    11. Applied patch from Google to remove an optimization that didn't quite work.
578        The report of the bug said:
579    
580          pcrecpp::RE("a*").FullMatch("aaa") matches, while
581          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
582          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
583    
584    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
585        it matched the wrong number of bytes.
586    
587    
588    Version 7.1 24-Apr-07
589    ---------------------
590    
591     1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
592        that is more "standard", making use of automake and other Autotools. There
593        is some re-arrangement of the files and adjustment of comments consequent
594        on this.
595    
596     2. Part of the patch fixed a problem with the pcregrep tests. The test of -r
597        for recursive directory scanning broke on some systems because the files
598        are not scanned in any specific order and on different systems the order
599        was different. A call to "sort" has been inserted into RunGrepTest for the
600        approprate test as a short-term fix. In the longer term there may be an
601        alternative.
602    
603     3. I had an email from Eric Raymond about problems translating some of PCRE's
604        man pages to HTML (despite the fact that I distribute HTML pages, some
605        people do their own conversions for various reasons). The problems
606        concerned the use of low-level troff macros .br and .in. I have therefore
607        removed all such uses from the man pages (some were redundant, some could
608        be replaced by .nf/.fi pairs). The 132html script that I use to generate
609        HTML has been updated to handle .nf/.fi and to complain if it encounters
610        .br or .in.
611    
612     4. Updated comments in configure.ac that get placed in config.h.in and also
613        arranged for config.h to be included in the distribution, with the name
614        config.h.generic, for the benefit of those who have to compile without
615        Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
616    
617     5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan
618        Weber: (1) pcre_internal.h was missing some function renames; (2) updated
619        makevp.bat for the current PCRE, using the additional files
620        makevp_c.txt, makevp_l.txt, and pcregexp.pas.
621    
622     6. A Windows user reported a minor discrepancy with test 2, which turned out
623        to be caused by a trailing space on an input line that had got lost in his
624        copy. The trailing space was an accident, so I've just removed it.
625    
626     7. Add -Wl,-R... flags in pcre-config.in for *BSD* systems, as I'm told
627        that is needed.
628    
629     8. Mark ucp_table (in ucptable.h) and ucp_gentype (in pcre_ucp_searchfuncs.c)
630        as "const" (a) because they are and (b) because it helps the PHP
631        maintainers who have recently made a script to detect big data structures
632        in the php code that should be moved to the .rodata section. I remembered
633        to update Builducptable as well, so it won't revert if ucptable.h is ever
634        re-created.
635    
636     9. Added some extra #ifdef SUPPORT_UTF8 conditionals into pcretest.c,
637        pcre_printint.src, pcre_compile.c, pcre_study.c, and pcre_tables.c, in
638        order to be able to cut out the UTF-8 tables in the latter when UTF-8
639        support is not required. This saves 1.5-2K of code, which is important in
640        some applications.
641    
642        Later: more #ifdefs are needed in pcre_ord2utf8.c and pcre_valid_utf8.c
643        so as not to refer to the tables, even though these functions will never be
644        called when UTF-8 support is disabled. Otherwise there are problems with a
645        shared library.
646    
647    10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:
648    
649        (a) It was defining its arguments as char * instead of void *.
650    
651        (b) It was assuming that all moves were upwards in memory; this was true
652            a long time ago when I wrote it, but is no longer the case.
653    
654        The emulated memove() is provided for those environments that have neither
655        memmove() nor bcopy(). I didn't think anyone used it these days, but that
656        is clearly not the case, as these two bugs were recently reported.
657    
658    11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
659        and Detrail to create the HTML documentation, the .txt form of the man
660        pages, and it removes trailing spaces from listed files. It also creates
661        pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter
662        case, it wraps all the #defines with #ifndefs. This script should be run
663        before "make dist".
664    
665    12. Fixed two fairly obscure bugs concerned with quantified caseless matching
666        with Unicode property support.
667    
668        (a) For a maximizing quantifier, if the two different cases of the
669            character were of different lengths in their UTF-8 codings (there are
670            some cases like this - I found 11), and the matching function had to
671            back up over a mixture of the two cases, it incorrectly assumed they
672            were both the same length.
673    
674        (b) When PCRE was configured to use the heap rather than the stack for
675            recursion during matching, it was not correctly preserving the data for
676            the other case of a UTF-8 character when checking ahead for a match
677            while processing a minimizing repeat. If the check also involved
678            matching a wide character, but failed, corruption could cause an
679            erroneous result when trying to check for a repeat of the original
680            character.
681    
682    13. Some tidying changes to the testing mechanism:
683    
684        (a) The RunTest script now detects the internal link size and whether there
685            is UTF-8 and UCP support by running ./pcretest -C instead of relying on
686            values substituted by "configure". (The RunGrepTest script already did
687            this for UTF-8.) The configure.ac script no longer substitutes the
688            relevant variables.
689    
690        (b) The debugging options /B and /D in pcretest show the compiled bytecode
691            with length and offset values. This means that the output is different
692            for different internal link sizes. Test 2 is skipped for link sizes
693            other than 2 because of this, bypassing the problem. Unfortunately,
694            there was also a test in test 3 (the locale tests) that used /B and
695            failed for link sizes other than 2. Rather than cut the whole test out,
696            I have added a new /Z option to pcretest that replaces the length and
697            offset values with spaces. This is now used to make test 3 independent
698            of link size. (Test 2 will be tidied up later.)
699    
700    14. If erroroffset was passed as NULL to pcre_compile, it provoked a
701        segmentation fault instead of returning the appropriate error message.
702    
703    15. In multiline mode when the newline sequence was set to "any", the pattern
704        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
705        This doesn't seem right; it now treats the CRLF combination as the line
706        ending, and so does not match in that case. It's only a pattern such as ^$
707        that would hit this one: something like ^ABC$ would have failed after \r
708        and then tried again after \r\n.
709    
710    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
711        in an attempt to make files that differ only in their line terminators
712        compare equal. This works on Linux.
713    
714    17. Under certain error circumstances pcregrep might try to free random memory
715        as it exited. This is now fixed, thanks to valgrind.
716    
717    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
718        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
719        was because its rules for how to advance for /g after matching an empty
720        string at the end of a line did not allow for this case. They now check for
721        it specially.
722    
723    20. pcretest is supposed to handle patterns and data of any length, by
724        extending its buffers when necessary. It was getting this wrong when the
725        buffer for a data line had to be extended.
726    
727    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
728        CRLF as a newline sequence.
729    
730    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
731        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
732        I have nevertheless tidied it up.
733    
734    23. Added some casts to kill warnings from HP-UX ia64 compiler.
735    
736    24. Added a man page for pcre-config.
737    
738    
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