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revision 102 by ph10, Tue Mar 6 15:50:45 2007 UTC revision 343 by ph10, Mon Apr 21 16:30:37 2008 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 7.1 05-Mar-07  Version 7.7 05-Mar-08
5  ---------------------  ---------------------
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      is some re-arrangement of the files and adjustment of comments consequent      done by checking for the strtoq, strtoll, and _strtoi64 functions.
     on this.  
11   2. Part of the patch fixed a problem with the pcregrep tests. The test of -r  2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
12      for recursive directory scanning broke on some systems because the files      pre-7.6 versions, which defined a global no_arg variable instead of putting
13      are not scanned in any specific order and on different systems the order      it in the RE class. (See also #8 below.)
     was different. A call to "sort" has been inserted into RunGrepTest for the  
     approprate test as a short-term fix. In the longer term there may be an  
15   3. I had an email from Eric Raymond about problems translating some of PCRE's  3.  Remove a line of dead code, identified by coverity and reported by Nuno
16      man pages to HTML (despite the fact that I distribute HTML pages, some      Lopes.
     people do their own conversions for various reasons). The problems  
     concerned the use of low-level troff macros .br and .in. I have therefore  
     removed all such uses from the man pages (some were redundant, some could  
     be replaced by .nf/.fi pairs). The maintain/132html script that I use to  
     generate HTML has been updated to handle .nf/.fi and to complain if it  
     encounters .br or .in.  
18   4. Updated comments in configure.ac that get placed in config.h.in and also  4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
19      arranged for config.h to be included in the distribution, for the benefit  
20      of those who have to compile without Autotools (compare pcre.h).      (1) The include/exclude patterns were being applied to the whole pathnames
21            of files, instead of just to the final components.
23   5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan      (2) If there was more than one level of directory, the subdirectories were
24      Weber: (1) pcre_internal.h was missing some function renames; (2) updated          skipped unless they satisfied the include/exclude conditions. This is
25      makevp.bat for the current PCRE, using the additional files !compile.txt,          inconsistent with GNU grep (and could even be seen as contrary to the
26      !linklib.txt, and pcregexp.pas.          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.
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.
33   6. A Windows user reported a minor discrepancy with test 2, which turned out  6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
34      to be caused by a trailing space on an input line that had got lost in his      NUL character as backslash + 0 rather than backslash + NUL, because PCRE
35      copy. The trailing space was an accident, so I've just removed it.      doesn't support NULs in patterns.
37    7.  Added some missing "const"s to declarations of static tables in
38        pcre_compile.c and pcre_dfa_exec.c.
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.)
44    9.  Applied Craig's patch to remove the use of push_back().
46    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
47        matching function regexec().
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).
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.
61    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
62        to the way PCRE behaves:
64        (a) A lone ] character is dis-allowed (Perl treats it as data).
66        (b) A back reference to an unmatched subpattern matches an empty string
67            (Perl fails the current match path).
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.
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.)
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).
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.
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.
102    Version 7.6 28-Jan-08
103    ---------------------
105    1.  A character class containing a very large number of characters with
106        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
107        overflow.
109    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
110        HAVE_LONG_LONG is not defined.
112    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
113        bring them up to date and include new features. This patch includes:
115        - Fixed PH's badly added libz and libbz2 support.
116        - Fixed a problem with static linking.
117        - Added pcredemo. [But later removed - see 7 below.]
118        - Fixed dftables problem and added an option.
119        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
120            HAVE_LONG_LONG.
121        - Added readline support for pcretest.
122        - Added an listing of the option settings after cmake has run.
124    4.  A user submitted a patch to Makefile that makes it easy to create
125        "pcre.dll" under mingw when using Configure/Make. I added stuff to
126        Makefile.am that cause it to include this special target, without
127        affecting anything else. Note that the same mingw target plus all
128        the other distribution libraries and programs are now supported
129        when configuring with CMake (see 6 below) instead of with
130        Configure/Make.
132    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
133        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
134        exported in the Windows port". It has not yet been confirmed that the patch
135        solves the problem, but it does no harm.
137    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
138        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
139        with CMake, and also correct the comment about stack recursion.
141    7.  Remove the automatic building of pcredemo from the ./configure system and
142        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
143        of a program that users should build themselves after PCRE is installed, so
144        building it automatically is not really right. What is more, it gave
145        trouble in some build environments.
147    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
150    Version 7.5 10-Jan-08
151    ---------------------
153    1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
154        values in parens when parsing an RE using the C++ wrapper."
156    2.  Negative specials like \S did not work in character classes in UTF-8 mode.
157        Characters greater than 255 were excluded from the class instead of being
158        included.
160    3.  The same bug as (2) above applied to negated POSIX classes such as
161        [:^space:].
163    4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
164        defined or documented. It seems to have been a typo for PCRE_STATIC, so
165        I have changed it.
167    5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
168        first named subpattern) and a construct such as (?&a) would reference the
169        first named subpattern whose name started with "a" (in other words, the
170        length check was missing). Both these problems are fixed. "Subpattern name
171        expected" is now given for (?&) (a zero-length name), and this patch also
172        makes it give the same error for \k'' (previously it complained that that
173        was a reference to a non-existent subpattern).
175    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
176        this is right because (?- can be followed by option settings as well as by
177        digits. I have, however, made the messages clearer.
179    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
180        than the number used in the conditional) now cause a compile-time error.
181        This is actually not compatible with Perl, which accepts such patterns, but
182        treats the conditional as always being FALSE (as PCRE used to), but it
183        seems to me that giving a diagnostic is better.
185    8.  Change "alphameric" to the more common word "alphanumeric" in comments
186        and messages.
188    9.  Fix two occurrences of "backslash" in comments that should have been
189        "backspace".
191    10. Remove two redundant lines of code that can never be obeyed (their function
192        was moved elsewhere).
194    11. The program that makes PCRE's Unicode character property table had a bug
195        which caused it to generate incorrect table entries for sequences of
196        characters that have the same character type, but are in different scripts.
197        It amalgamated them into a single range, with the script of the first of
198        them. In other words, some characters were in the wrong script. There were
199        thirteen such cases, affecting characters in the following ranges:
201          U+002b0 - U+002c1
202          U+0060c - U+0060d
203          U+0061e - U+00612
204          U+0064b - U+0065e
205          U+0074d - U+0076d
206          U+01800 - U+01805
207          U+01d00 - U+01d77
208          U+01d9b - U+01dbf
209          U+0200b - U+0200f
210          U+030fc - U+030fe
211          U+03260 - U+0327f
212          U+0fb46 - U+0fbb1
213          U+10450 - U+1049d
215    12. The -o option (show only the matching part of a line) for pcregrep was not
216        compatible with GNU grep in that, if there was more than one match in a
217        line, it showed only the first of them. It now behaves in the same way as
218        GNU grep.
220    13. If the -o and -v options were combined for pcregrep, it printed a blank
221        line for every non-matching line. GNU grep prints nothing, and pcregrep now
222        does the same. The return code can be used to tell if there were any
223        non-matching lines.
225    14. Added --file-offsets and --line-offsets to pcregrep.
227    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
228        infinitely looping recursion. The bug was that positive lookaheads were not
229        being skipped when checking for a possible empty match (negative lookaheads
230        and both kinds of lookbehind were skipped).
232    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
233        inclusion of <windows.h> to before rather than after the definition of
234        INVALID_FILE_ATTRIBUTES (patch from David Byron).
236    17. Specifying a possessive quantifier with a specific limit for a Unicode
237        character property caused pcre_compile() to compile bad code, which led at
238        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
239        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
240        caused the error; without that there was no problem.
242    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
244    19. Added --enable-pcretest-libreadline.
246    20. In pcrecpp.cc, the variable 'count' was incremented twice in
247        RE::GlobalReplace(). As a result, the number of replacements returned was
248        double what it should be. I removed one of the increments, but Craig sent a
249        later patch that removed the other one (the right fix) and added unit tests
250        that check the return values (which was not done before).
252    21. Several CMake things:
254        (1) Arranged that, when cmake is used on Unix, the libraries end up with
255            the names libpcre and libpcreposix, not just pcre and pcreposix.
257        (2) The above change means that pcretest and pcregrep are now correctly
258            linked with the newly-built libraries, not previously installed ones.
262    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
263        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
264        UTF-8 newline character). The key issue is that the pattern starts .*;
265        this means that the match must be either at the beginning, or after a
266        newline. The bug was in the code for advancing after a failed match and
267        checking that the new position followed a newline. It was not taking
268        account of UTF-8 characters correctly.
270    23. PCRE was behaving differently from Perl in the way it recognized POSIX
271        character classes. PCRE was not treating the sequence [:...:] as a
272        character class unless the ... were all letters. Perl, however, seems to
273        allow any characters between [: and :], though of course it rejects as
274        unknown any "names" that contain non-letters, because all the known class
275        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
276        for example, whereas PCRE did not - it did not recognize a POSIX character
277        class. This seemed a bit dangerous, so the code has been changed to be
278        closer to Perl. The behaviour is not identical to Perl, because PCRE will
279        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
280        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
281        Perl does, and where it didn't before.
283    24. Rewrite so as to remove the single use of %n from pcregrep because in some
284        Windows environments %n is disabled by default.
287    Version 7.4 21-Sep-07
288    ---------------------
290    1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This
291        means that a class such as [\s] counted as "explicit reference to CR or
292        LF". That isn't really right - the whole point of the change was to try to
293        help when there was an actual mention of one of the two characters. So now
294        the change happens only if \r or \n (or a literal CR or LF) character is
295        encountered.
297    2.  The 32-bit options word was also used for 6 internal flags, but the numbers
298        of both had grown to the point where there were only 3 bits left.
299        Fortunately, there was spare space in the data structure, and so I have
300        moved the internal flags into a new 16-bit field to free up more option
301        bits.
303    3.  The appearance of (?J) at the start of a pattern set the DUPNAMES option,
304        but did not set the internal JCHANGED flag - either of these is enough to
305        control the way the "get" function works - but the PCRE_INFO_JCHANGED
306        facility is supposed to tell if (?J) was ever used, so now (?J) at the
307        start sets both bits.
309    4.  Added options (at build time, compile time, exec time) to change \R from
310        matching any Unicode line ending sequence to just matching CR, LF, or CRLF.
312    5.  doc/pcresyntax.html was missing from the distribution.
314    6.  Put back the definition of PCRE_ERROR_NULLWSLIMIT, for backward
315        compatibility, even though it is no longer used.
317    7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and
318        strtoull to pcrecpp.cc to select the available functions in WIN32 when the
319        windows.h file is present (where different names are used). [This was
320        reversed later after testing - see 16 below.]
322    8.  Changed all #include <config.h> to #include "config.h". There were also
323        some further <pcre.h> cases that I changed to "pcre.h".
325    9.  When pcregrep was used with the --colour option, it missed the line ending
326        sequence off the lines that it output.
328    10. It was pointed out to me that arrays of string pointers cause lots of
329        relocations when a shared library is dynamically loaded. A technique of
330        using a single long string with a table of offsets can drastically reduce
331        these. I have refactored PCRE in four places to do this. The result is
332        dramatic:
334          Originally:                          290
335          After changing UCP table:            187
336          After changing error message table:   43
337          After changing table of "verbs"       36
338          After changing table of Posix names   22
340        Thanks to the folks working on Gregex for glib for this insight.
342    11. --disable-stack-for-recursion caused compiling to fail unless -enable-
343        unicode-properties was also set.
345    12. Updated the tests so that they work when \R is defaulted to ANYCRLF.
347    13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously
348        checked only for CRLF.
350    14. Added casts to pcretest.c to avoid compiler warnings.
352    15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
354    16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
355        and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
356        entirely. This removes changes made in 7 above.
358    17. The CMake files have been updated, and there is now more information about
359        building with CMake in the NON-UNIX-USE document.
362    Version 7.3 28-Aug-07
363    ---------------------
365     1. In the rejigging of the build system that eventually resulted in 7.1, the
366        line "#include <pcre.h>" was included in pcre_internal.h. The use of angle
367        brackets there is not right, since it causes compilers to look for an
368        installed pcre.h, not the version that is in the source that is being
369        compiled (which of course may be different). I have changed it back to:
371          #include "pcre.h"
373        I have a vague recollection that the change was concerned with compiling in
374        different directories, but in the new build system, that is taken care of
375        by the VPATH setting the Makefile.
377     2. The pattern .*$ when run in not-DOTALL UTF-8 mode with newline=any failed
378        when the subject happened to end in the byte 0x85 (e.g. if the last
379        character was \x{1ec5}). *Character* 0x85 is one of the "any" newline
380        characters but of course it shouldn't be taken as a newline when it is part
381        of another character. The bug was that, for an unlimited repeat of . in
382        not-DOTALL UTF-8 mode, PCRE was advancing by bytes rather than by
383        characters when looking for a newline.
385     3. A small performance improvement in the DOTALL UTF-8 mode .* case.
387     4. Debugging: adjusted the names of opcodes for different kinds of parentheses
388        in debug output.
390     5. Arrange to use "%I64d" instead of "%lld" and "%I64u" instead of "%llu" for
391        long printing in the pcrecpp unittest when running under MinGW.
393     6. ESC_K was left out of the EBCDIC table.
395     7. Change 7.0/38 introduced a new limit on the number of nested non-capturing
396        parentheses; I made it 1000, which seemed large enough. Unfortunately, the
397        limit also applies to "virtual nesting" when a pattern is recursive, and in
398        this case 1000 isn't so big. I have been able to remove this limit at the
399        expense of backing off one optimization in certain circumstances. Normally,
400        when pcre_exec() would call its internal match() function recursively and
401        immediately return the result unconditionally, it uses a "tail recursion"
402        feature to save stack. However, when a subpattern that can match an empty
403        string has an unlimited repetition quantifier, it no longer makes this
404        optimization. That gives it a stack frame in which to save the data for
405        checking that an empty string has been matched. Previously this was taken
406        from the 1000-entry workspace that had been reserved. So now there is no
407        explicit limit, but more stack is used.
409     8. Applied Daniel's patches to solve problems with the import/export magic
410        syntax that is required for Windows, and which was going wrong for the
411        pcreposix and pcrecpp parts of the library. These were overlooked when this
412        problem was solved for the main library.
414     9. There were some crude static tests to avoid integer overflow when computing
415        the size of patterns that contain repeated groups with explicit upper
416        limits. As the maximum quantifier is 65535, the maximum group length was
417        set at 30,000 so that the product of these two numbers did not overflow a
418        32-bit integer. However, it turns out that people want to use groups that
419        are longer than 30,000 bytes (though not repeat them that many times).
420        Change 7.0/17 (the refactoring of the way the pattern size is computed) has
421        made it possible to implement the integer overflow checks in a much more
422        dynamic way, which I have now done. The artificial limitation on group
423        length has been removed - we now have only the limit on the total length of
424        the compiled pattern, which depends on the LINK_SIZE setting.
426    10. Fixed a bug in the documentation for get/copy named substring when
427        duplicate names are permitted. If none of the named substrings are set, the
428        functions return PCRE_ERROR_NOSUBSTRING (7); the doc said they returned an
429        empty string.
431    11. Because Perl interprets \Q...\E at a high level, and ignores orphan \E
432        instances, patterns such as [\Q\E] or [\E] or even [^\E] cause an error,
433        because the ] is interpreted as the first data character and the
434        terminating ] is not found. PCRE has been made compatible with Perl in this
435        regard. Previously, it interpreted [\Q\E] as an empty class, and [\E] could
436        cause memory overwriting.
438    10. Like Perl, PCRE automatically breaks an unlimited repeat after an empty
439        string has been matched (to stop an infinite loop). It was not recognizing
440        a conditional subpattern that could match an empty string if that
441        subpattern was within another subpattern. For example, it looped when
442        trying to match  (((?(1)X|))*)  but it was OK with  ((?(1)X|)*)  where the
443        condition was not nested. This bug has been fixed.
445    12. A pattern like \X?\d or \P{L}?\d in non-UTF-8 mode could cause a backtrack
446        past the start of the subject in the presence of bytes with the top bit
447        set, for example "\x8aBCD".
449    13. Added Perl 5.10 experimental backtracking controls (*FAIL), (*F), (*PRUNE),
450        (*SKIP), (*THEN), (*COMMIT), and (*ACCEPT).
452    14. Optimized (?!) to (*FAIL).
454    15. Updated the test for a valid UTF-8 string to conform to the later RFC 3629.
455        This restricts code points to be within the range 0 to 0x10FFFF, excluding
456        the "low surrogate" sequence 0xD800 to 0xDFFF. Previously, PCRE allowed the
457        full range 0 to 0x7FFFFFFF, as defined by RFC 2279. Internally, it still
458        does: it's just the validity check that is more restrictive.
460    16. Inserted checks for integer overflows during escape sequence (backslash)
461        processing, and also fixed erroneous offset values for syntax errors during
462        backslash processing.
464    17. Fixed another case of looking too far back in non-UTF-8 mode (cf 12 above)
465        for patterns like [\PPP\x8a]{1,}\x80 with the subject "A\x80".
467    18. An unterminated class in a pattern like (?1)\c[ with a "forward reference"
468        caused an overrun.
470    19. A pattern like (?:[\PPa*]*){8,} which had an "extended class" (one with
471        something other than just ASCII characters) inside a group that had an
472        unlimited repeat caused a loop at compile time (while checking to see
473        whether the group could match an empty string).
475    20. Debugging a pattern containing \p or \P could cause a crash. For example,
476        [\P{Any}] did so. (Error in the code for printing property names.)
478    21. An orphan \E inside a character class could cause a crash.
480    22. A repeated capturing bracket such as (A)? could cause a wild memory
481        reference during compilation.
483    23. There are several functions in pcre_compile() that scan along a compiled
484        expression for various reasons (e.g. to see if it's fixed length for look
485        behind). There were bugs in these functions when a repeated \p or \P was
486        present in the pattern. These operators have additional parameters compared
487        with \d, etc, and these were not being taken into account when moving along
488        the compiled data. Specifically:
490        (a) A item such as \p{Yi}{3} in a lookbehind was not treated as fixed
491            length.
493        (b) An item such as \pL+ within a repeated group could cause crashes or
494            loops.
496        (c) A pattern such as \p{Yi}+(\P{Yi}+)(?1) could give an incorrect
497            "reference to non-existent subpattern" error.
499        (d) A pattern like (\P{Yi}{2}\277)? could loop at compile time.
501    24. A repeated \S or \W in UTF-8 mode could give wrong answers when multibyte
502        characters were involved (for example /\S{2}/8g with "A\x{a3}BC").
504    25. Using pcregrep in multiline, inverted mode (-Mv) caused it to loop.
506    26. Patterns such as [\P{Yi}A] which include \p or \P and just one other
507        character were causing crashes (broken optimization).
509    27. Patterns such as (\P{Yi}*\277)* (group with possible zero repeat containing
510        \p or \P) caused a compile-time loop.
512    28. More problems have arisen in unanchored patterns when CRLF is a valid line
513        break. For example, the unstudied pattern [\r\n]A does not match the string
514        "\r\nA" because change 7.0/46 below moves the current point on by two
515        characters after failing to match at the start. However, the pattern \nA
516        *does* match, because it doesn't start till \n, and if [\r\n]A is studied,
517        the same is true. There doesn't seem any very clean way out of this, but
518        what I have chosen to do makes the common cases work: PCRE now takes note
519        of whether there can be an explicit match for \r or \n anywhere in the
520        pattern, and if so, 7.0/46 no longer applies. As part of this change,
521        there's a new PCRE_INFO_HASCRORLF option for finding out whether a compiled
522        pattern has explicit CR or LF references.
524    29. Added (*CR) etc for changing newline setting at start of pattern.
527    Version 7.2 19-Jun-07
528    ---------------------
530     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
531        which is apparently normally available under Windows.
533     2. Re-jig the pcregrep tests with different newline settings in an attempt
534        to make them independent of the local environment's newline setting.
536     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
538     4. Some of the "internals" tests were previously cut out when the link size
539        was not 2, because the output contained actual offsets. The recent new
540        "Z" feature of pcretest means that these can be cut out, making the tests
541        usable with all link sizes.
543     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
544        stack recursion. This gives a massive performance boost under BSD, but just
545        a small improvement under Linux. However, it saves one field in the frame
546        in all cases.
548     6. Added more features from the forthcoming Perl 5.10:
550        (a) (?-n) (where n is a string of digits) is a relative subroutine or
551            recursion call. It refers to the nth most recently opened parentheses.
553        (b) (?+n) is also a relative subroutine call; it refers to the nth next
554            to be opened parentheses.
556        (c) Conditions that refer to capturing parentheses can be specified
557            relatively, for example, (?(-2)... or (?(+3)...
559        (d) \K resets the start of the current match so that everything before
560            is not part of it.
562        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
564        (f) \g{name} is another synonym - part of Perl 5.10's unification of
565            reference syntax.
567        (g) (?| introduces a group in which the numbering of parentheses in each
568            alternative starts with the same number.
570        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
572     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
575     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
576        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
577        for detecting groups that can match an empty string.
579     9. A pattern with a very large number of alternatives (more than several
580        hundred) was running out of internal workspace during the pre-compile
581        phase, where pcre_compile() figures out how much memory will be needed. A
582        bit of new cunning has reduced the workspace needed for groups with
583        alternatives. The 1000-alternative test pattern now uses 12 bytes of
584        workspace instead of running out of the 4096 that are available.
586    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
588    11. Applied patch from Google to remove an optimization that didn't quite work.
589        The report of the bug said:
591          pcrecpp::RE("a*").FullMatch("aaa") matches, while
592          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
593          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
595    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
596        it matched the wrong number of bytes.
599    Version 7.1 24-Apr-07
600    ---------------------
602     1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
603        that is more "standard", making use of automake and other Autotools. There
604        is some re-arrangement of the files and adjustment of comments consequent
605        on this.
607     2. Part of the patch fixed a problem with the pcregrep tests. The test of -r
608        for recursive directory scanning broke on some systems because the files
609        are not scanned in any specific order and on different systems the order
610        was different. A call to "sort" has been inserted into RunGrepTest for the
611        approprate test as a short-term fix. In the longer term there may be an
612        alternative.
614     3. I had an email from Eric Raymond about problems translating some of PCRE's
615        man pages to HTML (despite the fact that I distribute HTML pages, some
616        people do their own conversions for various reasons). The problems
617        concerned the use of low-level troff macros .br and .in. I have therefore
618        removed all such uses from the man pages (some were redundant, some could
619        be replaced by .nf/.fi pairs). The 132html script that I use to generate
620        HTML has been updated to handle .nf/.fi and to complain if it encounters
621        .br or .in.
623     4. Updated comments in configure.ac that get placed in config.h.in and also
624        arranged for config.h to be included in the distribution, with the name
625        config.h.generic, for the benefit of those who have to compile without
626        Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
628     5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan
629        Weber: (1) pcre_internal.h was missing some function renames; (2) updated
630        makevp.bat for the current PCRE, using the additional files
631        makevp_c.txt, makevp_l.txt, and pcregexp.pas.
633     6. A Windows user reported a minor discrepancy with test 2, which turned out
634        to be caused by a trailing space on an input line that had got lost in his
635        copy. The trailing space was an accident, so I've just removed it.
637     7. Add -Wl,-R... flags in pcre-config.in for *BSD* systems, as I'm told
638        that is needed.
640     8. Mark ucp_table (in ucptable.h) and ucp_gentype (in pcre_ucp_searchfuncs.c)
641        as "const" (a) because they are and (b) because it helps the PHP
642        maintainers who have recently made a script to detect big data structures
643        in the php code that should be moved to the .rodata section. I remembered
644        to update Builducptable as well, so it won't revert if ucptable.h is ever
645        re-created.
647     9. Added some extra #ifdef SUPPORT_UTF8 conditionals into pcretest.c,
648        pcre_printint.src, pcre_compile.c, pcre_study.c, and pcre_tables.c, in
649        order to be able to cut out the UTF-8 tables in the latter when UTF-8
650        support is not required. This saves 1.5-2K of code, which is important in
651        some applications.
653        Later: more #ifdefs are needed in pcre_ord2utf8.c and pcre_valid_utf8.c
654        so as not to refer to the tables, even though these functions will never be
655        called when UTF-8 support is disabled. Otherwise there are problems with a
656        shared library.
658    10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:
660        (a) It was defining its arguments as char * instead of void *.
662        (b) It was assuming that all moves were upwards in memory; this was true
663            a long time ago when I wrote it, but is no longer the case.
665        The emulated memove() is provided for those environments that have neither
666        memmove() nor bcopy(). I didn't think anyone used it these days, but that
667        is clearly not the case, as these two bugs were recently reported.
669    11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
670        and Detrail to create the HTML documentation, the .txt form of the man
671        pages, and it removes trailing spaces from listed files. It also creates
672        pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter
673        case, it wraps all the #defines with #ifndefs. This script should be run
674        before "make dist".
676    12. Fixed two fairly obscure bugs concerned with quantified caseless matching
677        with Unicode property support.
679        (a) For a maximizing quantifier, if the two different cases of the
680            character were of different lengths in their UTF-8 codings (there are
681            some cases like this - I found 11), and the matching function had to
682            back up over a mixture of the two cases, it incorrectly assumed they
683            were both the same length.
685        (b) When PCRE was configured to use the heap rather than the stack for
686            recursion during matching, it was not correctly preserving the data for
687            the other case of a UTF-8 character when checking ahead for a match
688            while processing a minimizing repeat. If the check also involved
689            matching a wide character, but failed, corruption could cause an
690            erroneous result when trying to check for a repeat of the original
691            character.
693    13. Some tidying changes to the testing mechanism:
695        (a) The RunTest script now detects the internal link size and whether there
696            is UTF-8 and UCP support by running ./pcretest -C instead of relying on
697            values substituted by "configure". (The RunGrepTest script already did
698            this for UTF-8.) The configure.ac script no longer substitutes the
699            relevant variables.
701        (b) The debugging options /B and /D in pcretest show the compiled bytecode
702            with length and offset values. This means that the output is different
703            for different internal link sizes. Test 2 is skipped for link sizes
704            other than 2 because of this, bypassing the problem. Unfortunately,
705            there was also a test in test 3 (the locale tests) that used /B and
706            failed for link sizes other than 2. Rather than cut the whole test out,
707            I have added a new /Z option to pcretest that replaces the length and
708            offset values with spaces. This is now used to make test 3 independent
709            of link size. (Test 2 will be tidied up later.)
711    14. If erroroffset was passed as NULL to pcre_compile, it provoked a
712        segmentation fault instead of returning the appropriate error message.
714    15. In multiline mode when the newline sequence was set to "any", the pattern
715        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
716        This doesn't seem right; it now treats the CRLF combination as the line
717        ending, and so does not match in that case. It's only a pattern such as ^$
718        that would hit this one: something like ^ABC$ would have failed after \r
719        and then tried again after \r\n.
721    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
722        in an attempt to make files that differ only in their line terminators
723        compare equal. This works on Linux.
725    17. Under certain error circumstances pcregrep might try to free random memory
726        as it exited. This is now fixed, thanks to valgrind.
728    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
729        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
730        was because its rules for how to advance for /g after matching an empty
731        string at the end of a line did not allow for this case. They now check for
732        it specially.
734    20. pcretest is supposed to handle patterns and data of any length, by
735        extending its buffers when necessary. It was getting this wrong when the
736        buffer for a data line had to be extended.
738    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
739        CRLF as a newline sequence.
741    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
742        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
743        I have nevertheless tidied it up.
745    23. Added some casts to kill warnings from HP-UX ia64 compiler.
747    24. Added a man page for pcre-config.
750  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06
751  ---------------------  ---------------------

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