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revision 104 by ph10, Tue Mar 6 16:25:15 2007 UTC revision 345 by ph10, Mon Apr 28 15:10:02 2008 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.1 05-Mar-07  Version 7.7 28-Apr-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. There      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    16. The implementation of 13c above involved the invention of a new opcode,
91        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
92        cannot be changed at match time, I realized I could make a small
93        improvement to matching performance by compiling OP_ALLANY instead of
94        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
95        on the OP_ANY path.
96    
97    17. Compiling pcretest on Windows with readline support failed without the
98        following two fixes: (1) Make the unistd.h include conditional on
99        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
100    
101    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
102        ncurses library to be included for pcretest when ReadLine support is
103        requested, but also to allow for it to be overridden. This patch came from
104        Daniel Bergström.
105    
106    
107    Version 7.6 28-Jan-08
108    ---------------------
109    
110    1.  A character class containing a very large number of characters with
111        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
112        overflow.
113    
114    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
115        HAVE_LONG_LONG is not defined.
116    
117    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
118        bring them up to date and include new features. This patch includes:
119    
120        - Fixed PH's badly added libz and libbz2 support.
121        - Fixed a problem with static linking.
122        - Added pcredemo. [But later removed - see 7 below.]
123        - Fixed dftables problem and added an option.
124        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
125            HAVE_LONG_LONG.
126        - Added readline support for pcretest.
127        - Added an listing of the option settings after cmake has run.
128    
129    4.  A user submitted a patch to Makefile that makes it easy to create
130        "pcre.dll" under mingw when using Configure/Make. I added stuff to
131        Makefile.am that cause it to include this special target, without
132        affecting anything else. Note that the same mingw target plus all
133        the other distribution libraries and programs are now supported
134        when configuring with CMake (see 6 below) instead of with
135        Configure/Make.
136    
137    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
138        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
139        exported in the Windows port". It has not yet been confirmed that the patch
140        solves the problem, but it does no harm.
141    
142    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
143        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
144        with CMake, and also correct the comment about stack recursion.
145    
146    7.  Remove the automatic building of pcredemo from the ./configure system and
147        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
148        of a program that users should build themselves after PCRE is installed, so
149        building it automatically is not really right. What is more, it gave
150        trouble in some build environments.
151    
152    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
153    
154    
155    Version 7.5 10-Jan-08
156    ---------------------
157    
158    1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
159        values in parens when parsing an RE using the C++ wrapper."
160    
161    2.  Negative specials like \S did not work in character classes in UTF-8 mode.
162        Characters greater than 255 were excluded from the class instead of being
163        included.
164    
165    3.  The same bug as (2) above applied to negated POSIX classes such as
166        [:^space:].
167    
168    4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
169        defined or documented. It seems to have been a typo for PCRE_STATIC, so
170        I have changed it.
171    
172    5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
173        first named subpattern) and a construct such as (?&a) would reference the
174        first named subpattern whose name started with "a" (in other words, the
175        length check was missing). Both these problems are fixed. "Subpattern name
176        expected" is now given for (?&) (a zero-length name), and this patch also
177        makes it give the same error for \k'' (previously it complained that that
178        was a reference to a non-existent subpattern).
179    
180    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
181        this is right because (?- can be followed by option settings as well as by
182        digits. I have, however, made the messages clearer.
183    
184    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
185        than the number used in the conditional) now cause a compile-time error.
186        This is actually not compatible with Perl, which accepts such patterns, but
187        treats the conditional as always being FALSE (as PCRE used to), but it
188        seems to me that giving a diagnostic is better.
189    
190    8.  Change "alphameric" to the more common word "alphanumeric" in comments
191        and messages.
192    
193    9.  Fix two occurrences of "backslash" in comments that should have been
194        "backspace".
195    
196    10. Remove two redundant lines of code that can never be obeyed (their function
197        was moved elsewhere).
198    
199    11. The program that makes PCRE's Unicode character property table had a bug
200        which caused it to generate incorrect table entries for sequences of
201        characters that have the same character type, but are in different scripts.
202        It amalgamated them into a single range, with the script of the first of
203        them. In other words, some characters were in the wrong script. There were
204        thirteen such cases, affecting characters in the following ranges:
205    
206          U+002b0 - U+002c1
207          U+0060c - U+0060d
208          U+0061e - U+00612
209          U+0064b - U+0065e
210          U+0074d - U+0076d
211          U+01800 - U+01805
212          U+01d00 - U+01d77
213          U+01d9b - U+01dbf
214          U+0200b - U+0200f
215          U+030fc - U+030fe
216          U+03260 - U+0327f
217          U+0fb46 - U+0fbb1
218          U+10450 - U+1049d
219    
220    12. The -o option (show only the matching part of a line) for pcregrep was not
221        compatible with GNU grep in that, if there was more than one match in a
222        line, it showed only the first of them. It now behaves in the same way as
223        GNU grep.
224    
225    13. If the -o and -v options were combined for pcregrep, it printed a blank
226        line for every non-matching line. GNU grep prints nothing, and pcregrep now
227        does the same. The return code can be used to tell if there were any
228        non-matching lines.
229    
230    14. Added --file-offsets and --line-offsets to pcregrep.
231    
232    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
233        infinitely looping recursion. The bug was that positive lookaheads were not
234        being skipped when checking for a possible empty match (negative lookaheads
235        and both kinds of lookbehind were skipped).
236    
237    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
238        inclusion of <windows.h> to before rather than after the definition of
239        INVALID_FILE_ATTRIBUTES (patch from David Byron).
240    
241    17. Specifying a possessive quantifier with a specific limit for a Unicode
242        character property caused pcre_compile() to compile bad code, which led at
243        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
244        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
245        caused the error; without that there was no problem.
246    
247    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
248    
249    19. Added --enable-pcretest-libreadline.
250    
251    20. In pcrecpp.cc, the variable 'count' was incremented twice in
252        RE::GlobalReplace(). As a result, the number of replacements returned was
253        double what it should be. I removed one of the increments, but Craig sent a
254        later patch that removed the other one (the right fix) and added unit tests
255        that check the return values (which was not done before).
256    
257    21. Several CMake things:
258    
259        (1) Arranged that, when cmake is used on Unix, the libraries end up with
260            the names libpcre and libpcreposix, not just pcre and pcreposix.
261    
262        (2) The above change means that pcretest and pcregrep are now correctly
263            linked with the newly-built libraries, not previously installed ones.
264    
265        (3) Added PCRE_SUPPORT_LIBREADLINE, PCRE_SUPPORT_LIBZ, PCRE_SUPPORT_LIBBZ2.
266    
267    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
268        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
269        UTF-8 newline character). The key issue is that the pattern starts .*;
270        this means that the match must be either at the beginning, or after a
271        newline. The bug was in the code for advancing after a failed match and
272        checking that the new position followed a newline. It was not taking
273        account of UTF-8 characters correctly.
274    
275    23. PCRE was behaving differently from Perl in the way it recognized POSIX
276        character classes. PCRE was not treating the sequence [:...:] as a
277        character class unless the ... were all letters. Perl, however, seems to
278        allow any characters between [: and :], though of course it rejects as
279        unknown any "names" that contain non-letters, because all the known class
280        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
281        for example, whereas PCRE did not - it did not recognize a POSIX character
282        class. This seemed a bit dangerous, so the code has been changed to be
283        closer to Perl. The behaviour is not identical to Perl, because PCRE will
284        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
285        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
286        Perl does, and where it didn't before.
287    
288    24. Rewrite so as to remove the single use of %n from pcregrep because in some
289        Windows environments %n is disabled by default.
290    
291    
292    Version 7.4 21-Sep-07
293    ---------------------
294    
295    1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This
296        means that a class such as [\s] counted as "explicit reference to CR or
297        LF". That isn't really right - the whole point of the change was to try to
298        help when there was an actual mention of one of the two characters. So now
299        the change happens only if \r or \n (or a literal CR or LF) character is
300        encountered.
301    
302    2.  The 32-bit options word was also used for 6 internal flags, but the numbers
303        of both had grown to the point where there were only 3 bits left.
304        Fortunately, there was spare space in the data structure, and so I have
305        moved the internal flags into a new 16-bit field to free up more option
306        bits.
307    
308    3.  The appearance of (?J) at the start of a pattern set the DUPNAMES option,
309        but did not set the internal JCHANGED flag - either of these is enough to
310        control the way the "get" function works - but the PCRE_INFO_JCHANGED
311        facility is supposed to tell if (?J) was ever used, so now (?J) at the
312        start sets both bits.
313    
314    4.  Added options (at build time, compile time, exec time) to change \R from
315        matching any Unicode line ending sequence to just matching CR, LF, or CRLF.
316    
317    5.  doc/pcresyntax.html was missing from the distribution.
318    
319    6.  Put back the definition of PCRE_ERROR_NULLWSLIMIT, for backward
320        compatibility, even though it is no longer used.
321    
322    7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and
323        strtoull to pcrecpp.cc to select the available functions in WIN32 when the
324        windows.h file is present (where different names are used). [This was
325        reversed later after testing - see 16 below.]
326    
327    8.  Changed all #include <config.h> to #include "config.h". There were also
328        some further <pcre.h> cases that I changed to "pcre.h".
329    
330    9.  When pcregrep was used with the --colour option, it missed the line ending
331        sequence off the lines that it output.
332    
333    10. It was pointed out to me that arrays of string pointers cause lots of
334        relocations when a shared library is dynamically loaded. A technique of
335        using a single long string with a table of offsets can drastically reduce
336        these. I have refactored PCRE in four places to do this. The result is
337        dramatic:
338    
339          Originally:                          290
340          After changing UCP table:            187
341          After changing error message table:   43
342          After changing table of "verbs"       36
343          After changing table of Posix names   22
344    
345        Thanks to the folks working on Gregex for glib for this insight.
346    
347    11. --disable-stack-for-recursion caused compiling to fail unless -enable-
348        unicode-properties was also set.
349    
350    12. Updated the tests so that they work when \R is defaulted to ANYCRLF.
351    
352    13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously
353        checked only for CRLF.
354    
355    14. Added casts to pcretest.c to avoid compiler warnings.
356    
357    15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
358    
359    16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
360        and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
361        entirely. This removes changes made in 7 above.
362    
363    17. The CMake files have been updated, and there is now more information about
364        building with CMake in the NON-UNIX-USE document.
365    
366    
367    Version 7.3 28-Aug-07
368    ---------------------
369    
370     1. In the rejigging of the build system that eventually resulted in 7.1, the
371        line "#include <pcre.h>" was included in pcre_internal.h. The use of angle
372        brackets there is not right, since it causes compilers to look for an
373        installed pcre.h, not the version that is in the source that is being
374        compiled (which of course may be different). I have changed it back to:
375    
376          #include "pcre.h"
377    
378        I have a vague recollection that the change was concerned with compiling in
379        different directories, but in the new build system, that is taken care of
380        by the VPATH setting the Makefile.
381    
382     2. The pattern .*$ when run in not-DOTALL UTF-8 mode with newline=any failed
383        when the subject happened to end in the byte 0x85 (e.g. if the last
384        character was \x{1ec5}). *Character* 0x85 is one of the "any" newline
385        characters but of course it shouldn't be taken as a newline when it is part
386        of another character. The bug was that, for an unlimited repeat of . in
387        not-DOTALL UTF-8 mode, PCRE was advancing by bytes rather than by
388        characters when looking for a newline.
389    
390     3. A small performance improvement in the DOTALL UTF-8 mode .* case.
391    
392     4. Debugging: adjusted the names of opcodes for different kinds of parentheses
393        in debug output.
394    
395     5. Arrange to use "%I64d" instead of "%lld" and "%I64u" instead of "%llu" for
396        long printing in the pcrecpp unittest when running under MinGW.
397    
398     6. ESC_K was left out of the EBCDIC table.
399    
400     7. Change 7.0/38 introduced a new limit on the number of nested non-capturing
401        parentheses; I made it 1000, which seemed large enough. Unfortunately, the
402        limit also applies to "virtual nesting" when a pattern is recursive, and in
403        this case 1000 isn't so big. I have been able to remove this limit at the
404        expense of backing off one optimization in certain circumstances. Normally,
405        when pcre_exec() would call its internal match() function recursively and
406        immediately return the result unconditionally, it uses a "tail recursion"
407        feature to save stack. However, when a subpattern that can match an empty
408        string has an unlimited repetition quantifier, it no longer makes this
409        optimization. That gives it a stack frame in which to save the data for
410        checking that an empty string has been matched. Previously this was taken
411        from the 1000-entry workspace that had been reserved. So now there is no
412        explicit limit, but more stack is used.
413    
414     8. Applied Daniel's patches to solve problems with the import/export magic
415        syntax that is required for Windows, and which was going wrong for the
416        pcreposix and pcrecpp parts of the library. These were overlooked when this
417        problem was solved for the main library.
418    
419     9. There were some crude static tests to avoid integer overflow when computing
420        the size of patterns that contain repeated groups with explicit upper
421        limits. As the maximum quantifier is 65535, the maximum group length was
422        set at 30,000 so that the product of these two numbers did not overflow a
423        32-bit integer. However, it turns out that people want to use groups that
424        are longer than 30,000 bytes (though not repeat them that many times).
425        Change 7.0/17 (the refactoring of the way the pattern size is computed) has
426        made it possible to implement the integer overflow checks in a much more
427        dynamic way, which I have now done. The artificial limitation on group
428        length has been removed - we now have only the limit on the total length of
429        the compiled pattern, which depends on the LINK_SIZE setting.
430    
431    10. Fixed a bug in the documentation for get/copy named substring when
432        duplicate names are permitted. If none of the named substrings are set, the
433        functions return PCRE_ERROR_NOSUBSTRING (7); the doc said they returned an
434        empty string.
435    
436    11. Because Perl interprets \Q...\E at a high level, and ignores orphan \E
437        instances, patterns such as [\Q\E] or [\E] or even [^\E] cause an error,
438        because the ] is interpreted as the first data character and the
439        terminating ] is not found. PCRE has been made compatible with Perl in this
440        regard. Previously, it interpreted [\Q\E] as an empty class, and [\E] could
441        cause memory overwriting.
442    
443    10. Like Perl, PCRE automatically breaks an unlimited repeat after an empty
444        string has been matched (to stop an infinite loop). It was not recognizing
445        a conditional subpattern that could match an empty string if that
446        subpattern was within another subpattern. For example, it looped when
447        trying to match  (((?(1)X|))*)  but it was OK with  ((?(1)X|)*)  where the
448        condition was not nested. This bug has been fixed.
449    
450    12. A pattern like \X?\d or \P{L}?\d in non-UTF-8 mode could cause a backtrack
451        past the start of the subject in the presence of bytes with the top bit
452        set, for example "\x8aBCD".
453    
454    13. Added Perl 5.10 experimental backtracking controls (*FAIL), (*F), (*PRUNE),
455        (*SKIP), (*THEN), (*COMMIT), and (*ACCEPT).
456    
457    14. Optimized (?!) to (*FAIL).
458    
459    15. Updated the test for a valid UTF-8 string to conform to the later RFC 3629.
460        This restricts code points to be within the range 0 to 0x10FFFF, excluding
461        the "low surrogate" sequence 0xD800 to 0xDFFF. Previously, PCRE allowed the
462        full range 0 to 0x7FFFFFFF, as defined by RFC 2279. Internally, it still
463        does: it's just the validity check that is more restrictive.
464    
465    16. Inserted checks for integer overflows during escape sequence (backslash)
466        processing, and also fixed erroneous offset values for syntax errors during
467        backslash processing.
468    
469    17. Fixed another case of looking too far back in non-UTF-8 mode (cf 12 above)
470        for patterns like [\PPP\x8a]{1,}\x80 with the subject "A\x80".
471    
472    18. An unterminated class in a pattern like (?1)\c[ with a "forward reference"
473        caused an overrun.
474    
475    19. A pattern like (?:[\PPa*]*){8,} which had an "extended class" (one with
476        something other than just ASCII characters) inside a group that had an
477        unlimited repeat caused a loop at compile time (while checking to see
478        whether the group could match an empty string).
479    
480    20. Debugging a pattern containing \p or \P could cause a crash. For example,
481        [\P{Any}] did so. (Error in the code for printing property names.)
482    
483    21. An orphan \E inside a character class could cause a crash.
484    
485    22. A repeated capturing bracket such as (A)? could cause a wild memory
486        reference during compilation.
487    
488    23. There are several functions in pcre_compile() that scan along a compiled
489        expression for various reasons (e.g. to see if it's fixed length for look
490        behind). There were bugs in these functions when a repeated \p or \P was
491        present in the pattern. These operators have additional parameters compared
492        with \d, etc, and these were not being taken into account when moving along
493        the compiled data. Specifically:
494    
495        (a) A item such as \p{Yi}{3} in a lookbehind was not treated as fixed
496            length.
497    
498        (b) An item such as \pL+ within a repeated group could cause crashes or
499            loops.
500    
501        (c) A pattern such as \p{Yi}+(\P{Yi}+)(?1) could give an incorrect
502            "reference to non-existent subpattern" error.
503    
504        (d) A pattern like (\P{Yi}{2}\277)? could loop at compile time.
505    
506    24. A repeated \S or \W in UTF-8 mode could give wrong answers when multibyte
507        characters were involved (for example /\S{2}/8g with "A\x{a3}BC").
508    
509    25. Using pcregrep in multiline, inverted mode (-Mv) caused it to loop.
510    
511    26. Patterns such as [\P{Yi}A] which include \p or \P and just one other
512        character were causing crashes (broken optimization).
513    
514    27. Patterns such as (\P{Yi}*\277)* (group with possible zero repeat containing
515        \p or \P) caused a compile-time loop.
516    
517    28. More problems have arisen in unanchored patterns when CRLF is a valid line
518        break. For example, the unstudied pattern [\r\n]A does not match the string
519        "\r\nA" because change 7.0/46 below moves the current point on by two
520        characters after failing to match at the start. However, the pattern \nA
521        *does* match, because it doesn't start till \n, and if [\r\n]A is studied,
522        the same is true. There doesn't seem any very clean way out of this, but
523        what I have chosen to do makes the common cases work: PCRE now takes note
524        of whether there can be an explicit match for \r or \n anywhere in the
525        pattern, and if so, 7.0/46 no longer applies. As part of this change,
526        there's a new PCRE_INFO_HASCRORLF option for finding out whether a compiled
527        pattern has explicit CR or LF references.
528    
529    29. Added (*CR) etc for changing newline setting at start of pattern.
530    
531    
532    Version 7.2 19-Jun-07
533    ---------------------
534    
535     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
536        which is apparently normally available under Windows.
537    
538     2. Re-jig the pcregrep tests with different newline settings in an attempt
539        to make them independent of the local environment's newline setting.
540    
541     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
542    
543     4. Some of the "internals" tests were previously cut out when the link size
544        was not 2, because the output contained actual offsets. The recent new
545        "Z" feature of pcretest means that these can be cut out, making the tests
546        usable with all link sizes.
547    
548     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
549        stack recursion. This gives a massive performance boost under BSD, but just
550        a small improvement under Linux. However, it saves one field in the frame
551        in all cases.
552    
553     6. Added more features from the forthcoming Perl 5.10:
554    
555        (a) (?-n) (where n is a string of digits) is a relative subroutine or
556            recursion call. It refers to the nth most recently opened parentheses.
557    
558        (b) (?+n) is also a relative subroutine call; it refers to the nth next
559            to be opened parentheses.
560    
561        (c) Conditions that refer to capturing parentheses can be specified
562            relatively, for example, (?(-2)... or (?(+3)...
563    
564        (d) \K resets the start of the current match so that everything before
565            is not part of it.
566    
567        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
568    
569        (f) \g{name} is another synonym - part of Perl 5.10's unification of
570            reference syntax.
571    
572        (g) (?| introduces a group in which the numbering of parentheses in each
573            alternative starts with the same number.
574    
575        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
576    
577     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
578        PCRE_INFO_JCHANGED.
579    
580     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
581        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
582        for detecting groups that can match an empty string.
583    
584     9. A pattern with a very large number of alternatives (more than several
585        hundred) was running out of internal workspace during the pre-compile
586        phase, where pcre_compile() figures out how much memory will be needed. A
587        bit of new cunning has reduced the workspace needed for groups with
588        alternatives. The 1000-alternative test pattern now uses 12 bytes of
589        workspace instead of running out of the 4096 that are available.
590    
591    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
592    
593    11. Applied patch from Google to remove an optimization that didn't quite work.
594        The report of the bug said:
595    
596          pcrecpp::RE("a*").FullMatch("aaa") matches, while
597          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
598          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
599    
600    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
601        it matched the wrong number of bytes.
602    
603    
604    Version 7.1 24-Apr-07
605    ---------------------
606    
607     1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
608        that is more "standard", making use of automake and other Autotools. There
609      is some re-arrangement of the files and adjustment of comments consequent      is some re-arrangement of the files and adjustment of comments consequent
610      on this.      on this.
611    
612   2. Part of the patch fixed a problem with the pcregrep tests. The test of -r   2. Part of the patch fixed a problem with the pcregrep tests. The test of -r
613      for recursive directory scanning broke on some systems because the files      for recursive directory scanning broke on some systems because the files
614      are not scanned in any specific order and on different systems the order      are not scanned in any specific order and on different systems the order
615      was different. A call to "sort" has been inserted into RunGrepTest for the      was different. A call to "sort" has been inserted into RunGrepTest for the
616      approprate test as a short-term fix. In the longer term there may be an      approprate test as a short-term fix. In the longer term there may be an
617      alternative.      alternative.
618    
619   3. I had an email from Eric Raymond about problems translating some of PCRE's   3. I had an email from Eric Raymond about problems translating some of PCRE's
620      man pages to HTML (despite the fact that I distribute HTML pages, some      man pages to HTML (despite the fact that I distribute HTML pages, some
621      people do their own conversions for various reasons). The problems      people do their own conversions for various reasons). The problems
622      concerned the use of low-level troff macros .br and .in. I have therefore      concerned the use of low-level troff macros .br and .in. I have therefore
623      removed all such uses from the man pages (some were redundant, some could      removed all such uses from the man pages (some were redundant, some could
624      be replaced by .nf/.fi pairs). The maintain/132html script that I use to      be replaced by .nf/.fi pairs). The 132html script that I use to generate
625      generate HTML has been updated to handle .nf/.fi and to complain if it      HTML has been updated to handle .nf/.fi and to complain if it encounters
626      encounters .br or .in.      .br or .in.
627    
628   4. Updated comments in configure.ac that get placed in config.h.in and also   4. Updated comments in configure.ac that get placed in config.h.in and also
629      arranged for config.h to be included in the distribution, for the benefit      arranged for config.h to be included in the distribution, with the name
630      of those who have to compile without Autotools (compare pcre.h).      config.h.generic, for the benefit of those who have to compile without
631        Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
632   5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan  
633      Weber: (1) pcre_internal.h was missing some function renames; (2) updated   5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan
634      makevp.bat for the current PCRE, using the additional files !compile.txt,      Weber: (1) pcre_internal.h was missing some function renames; (2) updated
635      !linklib.txt, and pcregexp.pas.      makevp.bat for the current PCRE, using the additional files
636        makevp_c.txt, makevp_l.txt, and pcregexp.pas.
637   6. A Windows user reported a minor discrepancy with test 2, which turned out  
638      to be caused by a trailing space on an input line that had got lost in his   6. A Windows user reported a minor discrepancy with test 2, which turned out
639        to be caused by a trailing space on an input line that had got lost in his
640      copy. The trailing space was an accident, so I've just removed it.      copy. The trailing space was an accident, so I've just removed it.
641    
642   7. Add -Wl,-R... flags in pcre-config.in for *BSD* systems, as I'm told   7. Add -Wl,-R... flags in pcre-config.in for *BSD* systems, as I'm told
643      that is needed.      that is needed.
644    
645     8. Mark ucp_table (in ucptable.h) and ucp_gentype (in pcre_ucp_searchfuncs.c)
646        as "const" (a) because they are and (b) because it helps the PHP
647        maintainers who have recently made a script to detect big data structures
648        in the php code that should be moved to the .rodata section. I remembered
649        to update Builducptable as well, so it won't revert if ucptable.h is ever
650        re-created.
651    
652     9. Added some extra #ifdef SUPPORT_UTF8 conditionals into pcretest.c,
653        pcre_printint.src, pcre_compile.c, pcre_study.c, and pcre_tables.c, in
654        order to be able to cut out the UTF-8 tables in the latter when UTF-8
655        support is not required. This saves 1.5-2K of code, which is important in
656        some applications.
657    
658        Later: more #ifdefs are needed in pcre_ord2utf8.c and pcre_valid_utf8.c
659        so as not to refer to the tables, even though these functions will never be
660        called when UTF-8 support is disabled. Otherwise there are problems with a
661        shared library.
662    
663    10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:
664    
665        (a) It was defining its arguments as char * instead of void *.
666    
667        (b) It was assuming that all moves were upwards in memory; this was true
668            a long time ago when I wrote it, but is no longer the case.
669    
670        The emulated memove() is provided for those environments that have neither
671        memmove() nor bcopy(). I didn't think anyone used it these days, but that
672        is clearly not the case, as these two bugs were recently reported.
673    
674    11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
675        and Detrail to create the HTML documentation, the .txt form of the man
676        pages, and it removes trailing spaces from listed files. It also creates
677        pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter
678        case, it wraps all the #defines with #ifndefs. This script should be run
679        before "make dist".
680    
681    12. Fixed two fairly obscure bugs concerned with quantified caseless matching
682        with Unicode property support.
683    
684        (a) For a maximizing quantifier, if the two different cases of the
685            character were of different lengths in their UTF-8 codings (there are
686            some cases like this - I found 11), and the matching function had to
687            back up over a mixture of the two cases, it incorrectly assumed they
688            were both the same length.
689    
690        (b) When PCRE was configured to use the heap rather than the stack for
691            recursion during matching, it was not correctly preserving the data for
692            the other case of a UTF-8 character when checking ahead for a match
693            while processing a minimizing repeat. If the check also involved
694            matching a wide character, but failed, corruption could cause an
695            erroneous result when trying to check for a repeat of the original
696            character.
697    
698    13. Some tidying changes to the testing mechanism:
699    
700        (a) The RunTest script now detects the internal link size and whether there
701            is UTF-8 and UCP support by running ./pcretest -C instead of relying on
702            values substituted by "configure". (The RunGrepTest script already did
703            this for UTF-8.) The configure.ac script no longer substitutes the
704            relevant variables.
705    
706        (b) The debugging options /B and /D in pcretest show the compiled bytecode
707            with length and offset values. This means that the output is different
708            for different internal link sizes. Test 2 is skipped for link sizes
709            other than 2 because of this, bypassing the problem. Unfortunately,
710            there was also a test in test 3 (the locale tests) that used /B and
711            failed for link sizes other than 2. Rather than cut the whole test out,
712            I have added a new /Z option to pcretest that replaces the length and
713            offset values with spaces. This is now used to make test 3 independent
714            of link size. (Test 2 will be tidied up later.)
715    
716    14. If erroroffset was passed as NULL to pcre_compile, it provoked a
717        segmentation fault instead of returning the appropriate error message.
718    
719    15. In multiline mode when the newline sequence was set to "any", the pattern
720        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
721        This doesn't seem right; it now treats the CRLF combination as the line
722        ending, and so does not match in that case. It's only a pattern such as ^$
723        that would hit this one: something like ^ABC$ would have failed after \r
724        and then tried again after \r\n.
725    
726    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
727        in an attempt to make files that differ only in their line terminators
728        compare equal. This works on Linux.
729    
730    17. Under certain error circumstances pcregrep might try to free random memory
731        as it exited. This is now fixed, thanks to valgrind.
732    
733    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
734        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
735        was because its rules for how to advance for /g after matching an empty
736        string at the end of a line did not allow for this case. They now check for
737        it specially.
738    
739    20. pcretest is supposed to handle patterns and data of any length, by
740        extending its buffers when necessary. It was getting this wrong when the
741        buffer for a data line had to be extended.
742    
743    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
744        CRLF as a newline sequence.
745    
746    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
747        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
748        I have nevertheless tidied it up.
749    
750    23. Added some casts to kill warnings from HP-UX ia64 compiler.
751    
752    24. Added a man page for pcre-config.
753    
754    
755  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06
756  ---------------------  ---------------------

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