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revision 185 by ph10, Tue Jun 19 13:39:46 2007 UTC revision 344 by ph10, Tue Apr 22 09:16:15 2008 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 7.2 19-June-07  Version 7.7 05-Mar-08
5    ---------------------
7    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
8        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.
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.)
15    3.  Remove a line of dead code, identified by coverity and reported by Nuno
16        Lopes.
18    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
20        (1) The include/exclude patterns were being applied to the whole pathnames
21            of files, instead of just to the final components.
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.
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.  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.
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.
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.
107    Version 7.6 28-Jan-08
108    ---------------------
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.
114    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
115        HAVE_LONG_LONG is not defined.
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:
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.
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.
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.
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.
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.
152    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
155    Version 7.5 10-Jan-08
156    ---------------------
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."
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.
165    3.  The same bug as (2) above applied to negated POSIX classes such as
166        [:^space:].
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.
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).
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.
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.
190    8.  Change "alphameric" to the more common word "alphanumeric" in comments
191        and messages.
193    9.  Fix two occurrences of "backslash" in comments that should have been
194        "backspace".
196    10. Remove two redundant lines of code that can never be obeyed (their function
197        was moved elsewhere).
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:
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
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.
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.
230    14. Added --file-offsets and --line-offsets to pcregrep.
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).
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).
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.
247    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
249    19. Added --enable-pcretest-libreadline.
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).
257    21. Several CMake things:
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.
262        (2) The above change means that pcretest and pcregrep are now correctly
263            linked with the newly-built libraries, not previously installed ones.
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.
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.
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.
292    Version 7.4 21-Sep-07
293    ---------------------
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.
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.
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.
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.
317    5.  doc/pcresyntax.html was missing from the distribution.
319    6.  Put back the definition of PCRE_ERROR_NULLWSLIMIT, for backward
320        compatibility, even though it is no longer used.
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.]
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".
330    9.  When pcregrep was used with the --colour option, it missed the line ending
331        sequence off the lines that it output.
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:
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
345        Thanks to the folks working on Gregex for glib for this insight.
347    11. --disable-stack-for-recursion caused compiling to fail unless -enable-
348        unicode-properties was also set.
350    12. Updated the tests so that they work when \R is defaulted to ANYCRLF.
352    13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously
353        checked only for CRLF.
355    14. Added casts to pcretest.c to avoid compiler warnings.
357    15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
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.
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.
367    Version 7.3 28-Aug-07
368    ---------------------
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:
376          #include "pcre.h"
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.
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.
390     3. A small performance improvement in the DOTALL UTF-8 mode .* case.
392     4. Debugging: adjusted the names of opcodes for different kinds of parentheses
393        in debug output.
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.
398     6. ESC_K was left out of the EBCDIC table.
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.
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.
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.
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.
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.
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.
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".
454    13. Added Perl 5.10 experimental backtracking controls (*FAIL), (*F), (*PRUNE),
455        (*SKIP), (*THEN), (*COMMIT), and (*ACCEPT).
457    14. Optimized (?!) to (*FAIL).
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.
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.
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".
472    18. An unterminated class in a pattern like (?1)\c[ with a "forward reference"
473        caused an overrun.
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).
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.)
483    21. An orphan \E inside a character class could cause a crash.
485    22. A repeated capturing bracket such as (A)? could cause a wild memory
486        reference during compilation.
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:
495        (a) A item such as \p{Yi}{3} in a lookbehind was not treated as fixed
496            length.
498        (b) An item such as \pL+ within a repeated group could cause crashes or
499            loops.
501        (c) A pattern such as \p{Yi}+(\P{Yi}+)(?1) could give an incorrect
502            "reference to non-existent subpattern" error.
504        (d) A pattern like (\P{Yi}{2}\277)? could loop at compile time.
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").
509    25. Using pcregrep in multiline, inverted mode (-Mv) caused it to loop.
511    26. Patterns such as [\P{Yi}A] which include \p or \P and just one other
512        character were causing crashes (broken optimization).
514    27. Patterns such as (\P{Yi}*\277)* (group with possible zero repeat containing
515        \p or \P) caused a compile-time loop.
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.
529    29. Added (*CR) etc for changing newline setting at start of pattern.
532    Version 7.2 19-Jun-07
533  ---------------------  ---------------------
535   1. If the fr_FR locale cannot be found for test 3, try the "french" locale,   1. If the fr_FR locale cannot be found for test 3, try the "french" locale,

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