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ChangeLog
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ChangeLog
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ChangeLog for PCRE
------------------
Version 8.32 30-November-2012
-----------------------------
1. Improved JIT compiler optimizations for first character search and single
character iterators.
2. Supporting IBM XL C compilers for PPC architectures in the JIT compiler.
Patch by Daniel Richard G.
3. Single character iterator optimizations in the JIT compiler.
4. Improved JIT compiler optimizations for character ranges.
5. Rename the "leave" variable names to "quit" to improve WinCE compatibility.
Reported by Giuseppe D'Angelo.
6. The PCRE_STARTLINE bit, indicating that a match can occur only at the start
of a line, was being set incorrectly in cases where .* appeared inside
atomic brackets at the start of a pattern, or where there was a subsequent
*PRUNE or *SKIP.
7. Improved instruction cache flush for POWER/PowerPC.
Patch by Daniel Richard G.
8. Fixed a number of issues in pcregrep, making it more compatible with GNU
grep:
(a) There is now no limit to the number of patterns to be matched.
(b) An error is given if a pattern is too long.
(c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
are now supported.
(d) --exclude-from and --include-from (multiple use) have been added.
(e) Exclusions and inclusions now apply to all files and directories, not
just to those obtained from scanning a directory recursively.
(f) Multiple uses of -f and --file-list are now supported.
(g) In a Windows environment, the default for -d has been changed from
"read" (the GNU grep default) to "skip", because otherwise the presence
of a directory in the file list provokes an error.
(h) The documentation has been revised and clarified in places.
9. Improve the matching speed of capturing brackets.
10. Changed the meaning of \X so that it now matches a Unicode extended
grapheme cluster.
11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
out POSIX threads when JIT support is configured.
12. Added support for PCRE_STUDY_EXTRA_NEEDED.
13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
structure could go wrong in environments where size_t is not the same size
as int.
14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
set.
15. The EBCDIC support had decayed; later updates to the code had included
explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
general tidy up of EBCDIC-related issues, and the documentation was also
not quite right. There is now a test that can be run on ASCII systems to
check some of the EBCDIC-related things (but is it not a full test).
16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
in a small tidy to the code.
17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
18. If the --only-matching (-o) option in pcregrep is specified multiple
times, each one causes appropriate output. For example, -o1 -o2 outputs the
substrings matched by the 1st and 2nd capturing parentheses. A separating
string can be specified by --om-separator (default empty).
19. Improving the first n character searches.
20. Turn case lists for horizontal and vertical white space into macros so that
they are defined only once.
21. This set of changes together give more compatible Unicode case-folding
behaviour for characters that have more than one other case when UCP
support is available.
(a) The Unicode property table now has offsets into a new table of sets of
three or more characters that are case-equivalent. The MultiStage2.py
script that generates these tables (the pcre_ucd.c file) now scans
CaseFolding.txt instead of UnicodeData.txt for character case
information.
(b) The code for adding characters or ranges of characters to a character
class has been abstracted into a generalized function that also handles
case-independence. In UTF-mode with UCP support, this uses the new data
to handle characters with more than one other case.
(c) A bug that is fixed as a result of (b) is that codepoints less than 256
whose other case is greater than 256 are now correctly matched
caselessly. Previously, the high codepoint matched the low one, but not
vice versa.
(d) The processing of \h, \H, \v, and \ in character classes now makes use
of the new class addition function, using character lists defined as
macros alongside the case definitions of 20 above.
(e) Caseless back references now work with characters that have more than
one other case.
(f) General caseless matching of characters with more than one other case
is supported.
22. Unicode character properties were updated from Unicode 6.2.0
23. Improved CMake support under Windows. Patch by Daniel Richard G.
24. Add support for 32-bit character strings, and UTF-32
25. Major JIT compiler update (code refactoring and bugfixing).
Experimental Sparc 32 support is added.
26. Applied a modified version of Daniel Richard G's patch to create
pcre.h.generic and config.h.generic by "make" instead of in the
PrepareRelease script.
27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
pcre_compile.c when checking for a zero character.
28. Introducing a native interface for JIT. Through this interface, the compiled
machine code can be directly executed. The purpose of this interface is to
provide fast pattern matching, so several sanity checks are not performed.
However, feature tests are still performed. The new interface provides
1.4x speedup compared to the old one.
29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
greater than 0x7fffffff (which cannot be represented in UTF-8, even under
the "old" RFC 2279). Instead, it ended up passing a negative length to
pcre_exec().
31. Add support for GCC's visibility feature to hide internal functions.
32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
"unknown -C option" after outputting 0 or 1.
33. There is now support for generating a code coverage report for the test
suite in environments where gcc is the compiler and lcov is installed. This
is mainly for the benefit of the developers.
34. If PCRE is built with --enable-valgrind, certain memory regions are marked
unaddressable using valgrind annotations, allowing valgrind to detect
invalid memory accesses. This is mainly for the benefit of the developers.
25. (*UTF) can now be used to start a pattern in any of the three libraries.
26. Give configure error if --enable-cpp but no C++ compiler found.
Version 8.31 06-July-2012
-------------------------
1. Fixing a wrong JIT test case and some compiler warnings.
2. Removed a bashism from the RunTest script.
3. Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
to unsigned type, result still unsigned" that was given by an MS compiler
on encountering the code "-sizeof(xxx)".
4. Partial matching support is added to the JIT compiler.
5. Fixed several bugs concerned with partial matching of items that consist
of more than one character:
(a) /^(..)\1/ did not partially match "aba" because checking references was
done on an "all or nothing" basis. This also applied to repeated
references.
(b) \R did not give a hard partial match if \r was found at the end of the
subject.
(c) \X did not give a hard partial match after matching one or more
characters at the end of the subject.
(d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
a partial match for the string "\r".
(e) When newline was set to CRLF, the metacharacter "." did not recognize
a partial match for a CR character at the end of the subject string.
6. If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
running pcretest, the text "(JIT)" added to the output whenever JIT is
actually used to run the match.
7. Individual JIT compile options can be set in pcretest by following -s+[+]
or /S+[+] with a digit between 1 and 7.
8. OP_NOT now supports any UTF character not just single-byte ones.
9. (*MARK) control verb is now supported by the JIT compiler.
10. The command "./RunTest list" lists the available tests without actually
running any of them. (Because I keep forgetting what they all are.)
11. Add PCRE_INFO_MAXLOOKBEHIND.
12. Applied a (slightly modified) user-supplied patch that improves performance
when the heap is used for recursion (compiled with --disable-stack-for-
recursion). Instead of malloc and free for each heap frame each time a
logical recursion happens, frames are retained on a chain and re-used where
possible. This sometimes gives as much as 30% improvement.
13. As documented, (*COMMIT) is now confined to within a recursive subpattern
call.
14. As documented, (*COMMIT) is now confined to within a positive assertion.
15. It is now possible to link pcretest with libedit as an alternative to
libreadline.
16. (*COMMIT) control verb is now supported by the JIT compiler.
17. The Unicode data tables have been updated to Unicode 6.1.0.
18. Added --file-list option to pcregrep.
19. Added binary file support to pcregrep, including the -a, --binary-files,
-I, and --text options.
20. The madvise function is renamed for posix_madvise for QNX compatibility
reasons. Fixed by Giuseppe D'Angelo.
21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
22. Changed the option for creating symbolic links for 16-bit man pages from
-s to -sf so that re-installing does not cause issues.
23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
24. Fixed a very old bug in pcretest that caused errors with restarted DFA
matches in certain environments (the workspace was not being correctly
retained). Also added to pcre_dfa_exec() a simple plausibility check on
some of the workspace data at the beginning of a restart.
25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
was not doing so when it should - probably a typo introduced by SVN 528
(change 8.10/14).
26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
\w+ when the character tables indicated that \x{c4} was a word character.
There were several related cases, all because the tests for doing a table
lookup were testing for characters less than 127 instead of 255.
27. If a pattern contains capturing parentheses that are not used in a match,
their slots in the ovector are set to -1. For those that are higher than
any matched groups, this happens at the end of processing. In the case when
there were back references that the ovector was too small to contain
(causing temporary malloc'd memory to be used during matching), and the
highest capturing number was not used, memory off the end of the ovector
was incorrectly being set to -1. (It was using the size of the temporary
memory instead of the true size.)
28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
ovector size, it uses memory at the end of the block that it has got.
29. Check for an overlong MARK name and give an error at compile time. The
limit is 255 for the 8-bit library and 65535 for the 16-bit library.
30. JIT compiler update.
31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
Rill for the patch.
32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
33. Variable renamings in the PCRE-JIT compiler. No functionality change.
34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
was enabled.
35. Improve JIT code generation for greedy plus quantifier.
36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
1 to "aa" instead of to an empty string. The bug affected repeated groups
that could potentially match an empty string.
37. Optimizing single character iterators in JIT.
38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
the same checks as \x{...} characters in non-JavaScript mode. Specifically,
codepoints that are too big for the mode are faulted, and in a UTF mode,
disallowed codepoints are also faulted.
39. If PCRE was compiled with UTF support, in three places in the DFA
matcher there was code that should only have been obeyed in UTF mode, but
was being obeyed unconditionally. In 8-bit mode this could cause incorrect
processing when bytes with values greater than 127 were present. In 16-bit
mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
both cases the values are those that cannot be the first data item in a UTF
character. The three items that might have provoked this were recursions,
possessively repeated groups, and atomic groups.
40. Ensure that libpcre is explicitly listed in the link commands for pcretest
and pcregrep, because some OS require shared objects to be explicitly
passed to ld, causing the link step to fail if they are not.
41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
mode, patterns that started with \h* or \R* might be incorrectly matched.
Version 8.30 04-February-2012
-----------------------------
1. Renamed "isnumber" as "is_a_number" because in some Mac environments this
name is defined in ctype.h.
2. Fixed a bug in fixed-length calculation for lookbehinds that would show up
only in quite long subpatterns.
3. Removed the function pcre_info(), which has been obsolete and deprecated
since it was replaced by pcre_fullinfo() in February 2000.
4. For a non-anchored pattern, if (*SKIP) was given with a name that did not
match a (*MARK), and the match failed at the start of the subject, a
reference to memory before the start of the subject could occur. This bug
was introduced by fix 17 of release 8.21.
5. A reference to an unset group with zero minimum repetition was giving
totally wrong answers (in non-JavaScript-compatibility mode). For example,
/(another)?(\1?)test/ matched against "hello world test". This bug was
introduced in release 8.13.
6. Add support for 16-bit character strings (a large amount of work involving
many changes and refactorings).
7. RunGrepTest failed on msys because \r\n was replaced by whitespace when the
command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
from a file.
8. Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
rounding is not applied in this particular case).
9. The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
if they appear, or are escaped, in patterns.
10. Get rid of a number of -Wunused-but-set-variable warnings.
11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
"x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
also returns the mark "x". This bug applied to capturing parentheses,
non-capturing parentheses, and atomic parentheses. It also applied to some
assertions.
12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
information out of configure.ac instead of relying on pcre.h.generic, which
is not stored in the repository.
13. Applied Dmitry V. Levin's patch for a more portable method for linking with
-lreadline.
14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
15. Applied Graycode's patch to put the top-level frame on the stack rather
than the heap when not using the stack for recursion. This gives a
performance improvement in many cases when recursion is not deep.
16. Experimental code added to "pcretest -C" to output the stack frame size.
Version 8.21 12-Dec-2011
------------------------
1. Updating the JIT compiler.
2. JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
are added as well.
3. Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
calling _pcre_jit_exec. Some extra comments are added.
4. (*MARK) settings inside atomic groups that do not contain any capturing
parentheses, for example, (?>a(*:m)), were not being passed out. This bug
was introduced by change 18 for 8.20.
5. Supporting of \x, \U and \u in JavaScript compatibility mode based on the
ECMA-262 standard.
6. Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
This bug was probably introduced by change 9 of 8.13.
7. While fixing 6 above, I noticed that a number of other items were being
incorrectly rejected as "not fixed length". This arose partly because newer
opcodes had not been added to the fixed-length checking code. I have (a)
corrected the bug and added tests for these items, and (b) arranged for an
error to occur if an unknown opcode is encountered while checking for fixed
length instead of just assuming "not fixed length". The items that were
rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
(*THEN), \h, \H, \v, \V, and single character negative classes with fixed
repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
8. A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
being incorrectly compiled and would have given unpredicatble results.
9. A possessively repeated subpattern with minimum repeat count greater than
one behaved incorrectly. For example, (A){2,}+ behaved as if it was
(A)(A)++ which meant that, after a subsequent mismatch, backtracking into
the first (A) could occur when it should not.
10. Add a cast and remove a redundant test from the code.
11. JIT should use pcre_malloc/pcre_free for allocation.
12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
best practice nowadays, and helps with cross-compiling. (If the exec_prefix
is anything other than /usr, -L is still shown).
13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
14. Perl does not support \N without a following name in a [] class; PCRE now
also gives an error.
15. If a forward reference was repeated with an upper limit of around 2000,
it caused the error "internal error: overran compiling workspace". The
maximum number of forward references (including repeats) was limited by the
internal workspace, and dependent on the LINK_SIZE. The code has been
rewritten so that the workspace expands (via pcre_malloc) if necessary, and
the default depends on LINK_SIZE. There is a new upper limit (for safety)
of around 200,000 forward references. While doing this, I also speeded up
the filling in of repeated forward references.
16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
incorrectly expecting the subject to contain another "a" after the start.
17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
in the match, the SKIP should be ignored. This was not happening; instead
the SKIP was being treated as NOMATCH. For patterns such as
/A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
tested.
18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
now much more compatible with Perl, in particular in cases where the result
is a non-match for a non-anchored pattern. For example, if
/b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
"m", where previously it did not return a name. A side effect of this
change is that for partial matches, the last encountered mark name is
returned, as for non matches. A number of tests that were previously not
Perl-compatible have been moved into the Perl-compatible test files. The
refactoring has had the pleasing side effect of removing one argument from
the match() function, thus reducing its stack requirements.
19. If the /S+ option was used in pcretest to study a pattern using JIT,
subsequent uses of /S (without +) incorrectly behaved like /S+.
21. Retrieve executable code size support for the JIT compiler and fixing
some warnings.
22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
not work when the shorter character appeared right at the end of the
subject string.
23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
systems.
24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
output it when the /M option is used in pcretest.
25. The CheckMan script was not being included in the distribution. Also, added
an explicit "perl" to run Perl scripts from the PrepareRelease script
because this is reportedly needed in Windows.
26. If study data was being save in a file and studying had not found a set of
"starts with" bytes for the pattern, the data written to the file (though
never used) was taken from uninitialized memory and so caused valgrind to
complain.
27. Updated RunTest.bat as provided by Sheri Pierce.
28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
29. Computation of memory usage for the table of capturing group names was
giving an unnecessarily large value.
Version 8.20 21-Oct-2011
------------------------
1. Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had
a POSIX class. After further experiments with Perl, which convinced me that
Perl has bugs and confusions, a closing square bracket is no longer allowed
in a POSIX name. This bug also affected patterns with classes that started
with full stops.
2. If a pattern such as /(a)b|ac/ is matched against "ac", there is no
captured substring, but while checking the failing first alternative,
substring 1 is temporarily captured. If the output vector supplied to
pcre_exec() was not big enough for this capture, the yield of the function
was still zero ("insufficient space for captured substrings"). This cannot
be totally fixed without adding another stack variable, which seems a lot
of expense for a edge case. However, I have improved the situation in cases
such as /(a)(b)x|abc/ matched against "abc", where the return code
indicates that fewer than the maximum number of slots in the ovector have
been set.
3. Related to (2) above: when there are more back references in a pattern than
slots in the output vector, pcre_exec() uses temporary memory during
matching, and copies in the captures as far as possible afterwards. It was
using the entire output vector, but this conflicts with the specification
that only 2/3 is used for passing back captured substrings. Now it uses
only the first 2/3, for compatibility. This is, of course, another edge
case.
4. Zoltan Herczeg's just-in-time compiler support has been integrated into the
main code base, and can be used by building with --enable-jit. When this is
done, pcregrep automatically uses it unless --disable-pcregrep-jit or the
runtime --no-jit option is given.
5. When the number of matches in a pcre_dfa_exec() run exactly filled the
ovector, the return from the function was zero, implying that there were
other matches that did not fit. The correct "exactly full" value is now
returned.
6. If a subpattern that was called recursively or as a subroutine contained
(*PRUNE) or any other control that caused it to give a non-standard return,
invalid errors such as "Error -26 (nested recursion at the same subject
position)" or even infinite loops could occur.
7. If a pattern such as /a(*SKIP)c|b(*ACCEPT)|/ was studied, it stopped
computing the minimum length on reaching *ACCEPT, and so ended up with the
wrong value of 1 rather than 0. Further investigation indicates that
computing a minimum subject length in the presence of *ACCEPT is difficult
(think back references, subroutine calls), and so I have changed the code
so that no minimum is registered for a pattern that contains *ACCEPT.
8. If (*THEN) was present in the first (true) branch of a conditional group,
it was not handled as intended. [But see 16 below.]
9. Replaced RunTest.bat and CMakeLists.txt with improved versions provided by
Sheri Pierce.
10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that
the first byte in a match must be "a".
11. Change 17 for 8.13 increased the recursion depth for patterns like
/a(?:.)*?a/ drastically. I've improved things by remembering whether a
pattern contains any instances of (*THEN). If it does not, the old
optimizations are restored. It would be nice to do this on a per-group
basis, but at the moment that is not feasible.
12. In some environments, the output of pcretest -C is CRLF terminated. This
broke RunTest's code that checks for the link size. A single white space
character after the value is now allowed for.
13. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".
For "fr", it uses the Windows-specific input and output files.
14. If (*THEN) appeared in a group that was called recursively or as a
subroutine, it did not work as intended. [But see next item.]
15. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex
pattern fragments (but not containing any | characters). If A and B are
matched, but there is a failure in C so that it backtracks to (*THEN), PCRE
was behaving differently to Perl. PCRE backtracked into A, but Perl goes to
D. In other words, Perl considers parentheses that do not contain any |
characters to be part of a surrounding alternative, whereas PCRE was
treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles
differently. PCRE now behaves in the same way as Perl, except in the case
of subroutine/recursion calls such as (?1) which have in any case always
been different (but PCRE had them first :-).
16. Related to 15 above: Perl does not treat the | in a conditional group as
creating alternatives. Such a group is treated in the same way as an
ordinary group without any | characters when processing (*THEN). PCRE has
been changed to match Perl's behaviour.
17. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the
RunGrepTest script failed.
18. Change 22 for version 13 caused atomic groups to use more stack. This is
inevitable for groups that contain captures, but it can lead to a lot of
stack use in large patterns. The old behaviour has been restored for atomic
groups that do not contain any capturing parentheses.
19. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not
suppress the check for a minimum subject length at run time. (If it was
given to pcre_exec() or pcre_dfa_exec() it did work.)
20. Fixed an ASCII-dependent infelicity in pcretest that would have made it
fail to work when decoding hex characters in data strings in EBCDIC
environments.
21. It appears that in at least one Mac OS environment, the isxdigit() function
is implemented as a macro that evaluates to its argument more than once,
contravening the C 90 Standard (I haven't checked a later standard). There
was an instance in pcretest which caused it to go wrong when processing
\x{...} escapes in subject strings. The has been rewritten to avoid using
things like p++ in the argument of isxdigit().
Version 8.13 16-Aug-2011
------------------------
1. The Unicode data tables have been updated to Unicode 6.0.0.
2. Two minor typos in pcre_internal.h have been fixed.
3. Added #include <string.h> to pcre_scanner_unittest.cc, pcrecpp.cc, and
pcrecpp_unittest.cc. They are needed for strcmp(), memset(), and strchr()
in some environments (e.g. Solaris 10/SPARC using Sun Studio 12U2).
4. There were a number of related bugs in the code for matching backrefences
caselessly in UTF-8 mode when codes for the characters concerned were
different numbers of bytes. For example, U+023A and U+2C65 are an upper
and lower case pair, using 2 and 3 bytes, respectively. The main bugs were:
(a) A reference to 3 copies of a 2-byte code matched only 2 of a 3-byte
code. (b) A reference to 2 copies of a 3-byte code would not match 2 of a
2-byte code at the end of the subject (it thought there wasn't enough data
left).
5. Comprehensive information about what went wrong is now returned by
pcre_exec() and pcre_dfa_exec() when the UTF-8 string check fails, as long
as the output vector has at least 2 elements. The offset of the start of
the failing character and a reason code are placed in the vector.
6. When the UTF-8 string check fails for pcre_compile(), the offset that is
now returned is for the first byte of the failing character, instead of the
last byte inspected. This is an incompatible change, but I hope it is small
enough not to be a problem. It makes the returned offset consistent with
pcre_exec() and pcre_dfa_exec().
7. pcretest now gives a text phrase as well as the error number when
pcre_exec() or pcre_dfa_exec() fails; if the error is a UTF-8 check
failure, the offset and reason code are output.
8. When \R was used with a maximizing quantifier it failed to skip backwards
over a \r\n pair if the subsequent match failed. Instead, it just skipped
back over a single character (\n). This seems wrong (because it treated the
two characters as a single entity when going forwards), conflicts with the
documentation that \R is equivalent to (?>\r\n|\n|...etc), and makes the
behaviour of \R* different to (\R)*, which also seems wrong. The behaviour
has been changed.
9. Some internal refactoring has changed the processing so that the handling
of the PCRE_CASELESS and PCRE_MULTILINE options is done entirely at compile
time (the PCRE_DOTALL option was changed this way some time ago: version
7.7 change 16). This has made it possible to abolish the OP_OPT op code,
which was always a bit of a fudge. It also means that there is one less
argument for the match() function, which reduces its stack requirements
slightly. This change also fixes an incompatibility with Perl: the pattern
(?i:([^b]))(?1) should not match "ab", but previously PCRE gave a match.
10. More internal refactoring has drastically reduced the number of recursive
calls to match() for possessively repeated groups such as (abc)++ when
using pcre_exec().
11. While implementing 10, a number of bugs in the handling of groups were
discovered and fixed:
(?<=(a)+) was not diagnosed as invalid (non-fixed-length lookbehind).
(a|)*(?1) gave a compile-time internal error.
((a|)+)+ did not notice that the outer group could match an empty string.
(^a|^)+ was not marked as anchored.
(.*a|.*)+ was not marked as matching at start or after a newline.
12. Yet more internal refactoring has removed another argument from the match()
function. Special calls to this function are now indicated by setting a
value in a variable in the "match data" data block.
13. Be more explicit in pcre_study() instead of relying on "default" for
opcodes that mean there is no starting character; this means that when new
ones are added and accidentally left out of pcre_study(), testing should
pick them up.
14. The -s option of pcretest has been documented for ages as being an old
synonym of -m (show memory usage). I have changed it to mean "force study
for every regex", that is, assume /S for every regex. This is similar to -i
and -d etc. It's slightly incompatible, but I'm hoping nobody is still
using it. It makes it easier to run collections of tests with and without
study enabled, and thereby test pcre_study() more easily. All the standard
tests are now run with and without -s (but some patterns can be marked as
"never study" - see 20 below).
15. When (*ACCEPT) was used in a subpattern that was called recursively, the
restoration of the capturing data to the outer values was not happening
correctly.
16. If a recursively called subpattern ended with (*ACCEPT) and matched an
empty string, and PCRE_NOTEMPTY was set, pcre_exec() thought the whole
pattern had matched an empty string, and so incorrectly returned a no
match.
17. There was optimizing code for the last branch of non-capturing parentheses,
and also for the obeyed branch of a conditional subexpression, which used
tail recursion to cut down on stack usage. Unfortunately, now that there is
the possibility of (*THEN) occurring in these branches, tail recursion is
no longer possible because the return has to be checked for (*THEN). These
two optimizations have therefore been removed. [But see 8.20/11 above.]
18. If a pattern containing \R was studied, it was assumed that \R always
matched two bytes, thus causing the minimum subject length to be
incorrectly computed because \R can also match just one byte.
19. If a pattern containing (*ACCEPT) was studied, the minimum subject length
was incorrectly computed.
20. If /S is present twice on a test pattern in pcretest input, it now
*disables* studying, thereby overriding the use of -s on the command line
(see 14 above). This is necessary for one or two tests to keep the output
identical in both cases.
21. When (*ACCEPT) was used in an assertion that matched an empty string and
PCRE_NOTEMPTY was set, PCRE applied the non-empty test to the assertion.
22. When an atomic group that contained a capturing parenthesis was
successfully matched, but the branch in which it appeared failed, the
capturing was not being forgotten if a higher numbered group was later
captured. For example, /(?>(a))b|(a)c/ when matching "ac" set capturing
group 1 to "a", when in fact it should be unset. This applied to multi-
branched capturing and non-capturing groups, repeated or not, and also to
positive assertions (capturing in negative assertions does not happen
in PCRE) and also to nested atomic groups.
23. Add the ++ qualifier feature to pcretest, to show the remainder of the
subject after a captured substring, to make it easier to tell which of a
number of identical substrings has been captured.
24. The way atomic groups are processed by pcre_exec() has been changed so that
if they are repeated, backtracking one repetition now resets captured
values correctly. For example, if ((?>(a+)b)+aabab) is matched against
"aaaabaaabaabab" the value of captured group 2 is now correctly recorded as
"aaa". Previously, it would have been "a". As part of this code
refactoring, the way recursive calls are handled has also been changed.
25. If an assertion condition captured any substrings, they were not passed
back unless some other capturing happened later. For example, if
(?(?=(a))a) was matched against "a", no capturing was returned.
26. When studying a pattern that contained subroutine calls or assertions,
the code for finding the minimum length of a possible match was handling
direct recursions such as (xxx(?1)|yyy) but not mutual recursions (where
group 1 called group 2 while simultaneously a separate group 2 called group
1). A stack overflow occurred in this case. I have fixed this by limiting
the recursion depth to 10.
27. Updated RunTest.bat in the distribution to the version supplied by Tom
Fortmann. This supports explicit test numbers on the command line, and has
argument validation and error reporting.
28. An instance of \X with an unlimited repeat could fail if at any point the
first character it looked at was a mark character.
29. Some minor code refactoring concerning Unicode properties and scripts
should reduce the stack requirement of match() slightly.
30. Added the '=' option to pcretest to check the setting of unused capturing
slots at the end of the pattern, which are documented as being -1, but are
not included in the return count.
31. If \k was not followed by a braced, angle-bracketed, or quoted name, PCRE
compiled something random. Now it gives a compile-time error (as does
Perl).
32. A *MARK encountered during the processing of a positive assertion is now
recorded and passed back (compatible with Perl).
33. If --only-matching or --colour was set on a pcregrep call whose pattern
had alternative anchored branches, the search for a second match in a line
was done as if at the line start. Thus, for example, /^01|^02/ incorrectly
matched the line "0102" twice. The same bug affected patterns that started
with a backwards assertion. For example /\b01|\b02/ also matched "0102"
twice.
34. Previously, PCRE did not allow quantification of assertions. However, Perl
does, and because of capturing effects, quantifying parenthesized
assertions may at times be useful. Quantifiers are now allowed for
parenthesized assertions.
35. A minor code tidy in pcre_compile() when checking options for \R usage.
36. \g was being checked for fancy things in a character class, when it should
just be a literal "g".
37. PCRE was rejecting [:a[:digit:]] whereas Perl was not. It seems that the
appearance of a nested POSIX class supersedes an apparent external class.
For example, [:a[:digit:]b:] matches "a", "b", ":", or a digit. Also,
unescaped square brackets may also appear as part of class names. For
example, [:a[:abc]b:] gives unknown class "[:abc]b:]". PCRE now behaves
more like Perl. (But see 8.20/1 above.)
38. PCRE was giving an error for \N with a braced quantifier such as {1,} (this
was because it thought it was \N{name}, which is not supported).
39. Add minix to OS list not supporting the -S option in pcretest.
40. PCRE tries to detect cases of infinite recursion at compile time, but it
cannot analyze patterns in sufficient detail to catch mutual recursions
such as ((?1))((?2)). There is now a runtime test that gives an error if a
subgroup is called recursively as a subpattern for a second time at the
same position in the subject string. In previous releases this might have
been caught by the recursion limit, or it might have run out of stack.
41. A pattern such as /(?(R)a+|(?R)b)/ is quite safe, as the recursion can
happen only once. PCRE was, however incorrectly giving a compile time error
"recursive call could loop indefinitely" because it cannot analyze the
pattern in sufficient detail. The compile time test no longer happens when
PCRE is compiling a conditional subpattern, but actual runaway loops are
now caught at runtime (see 40 above).
42. It seems that Perl allows any characters other than a closing parenthesis
to be part of the NAME in (*MARK:NAME) and other backtracking verbs. PCRE
has been changed to be the same.
43. Updated configure.ac to put in more quoting round AC_LANG_PROGRAM etc. so
as not to get warnings when autogen.sh is called. Also changed
AC_PROG_LIBTOOL (deprecated) to LT_INIT (the current macro).
44. To help people who use pcregrep to scan files containing exceedingly long
lines, the following changes have been made:
(a) The default value of the buffer size parameter has been increased from
8K to 20K. (The actual buffer used is three times this size.)
(b) The default can be changed by ./configure --with-pcregrep-bufsize when
PCRE is built.
(c) A --buffer-size=n option has been added to pcregrep, to allow the size
to be set at run time.
(d) Numerical values in pcregrep options can be followed by K or M, for
example --buffer-size=50K.
(e) If a line being scanned overflows pcregrep's buffer, an error is now
given and the return code is set to 2.
45. Add a pointer to the latest mark to the callout data block.
46. The pattern /.(*F)/, when applied to "abc" with PCRE_PARTIAL_HARD, gave a
partial match of an empty string instead of no match. This was specific to
the use of ".".
47. The pattern /f.*/8s, when applied to "for" with PCRE_PARTIAL_HARD, gave a
complete match instead of a partial match. This bug was dependent on both
the PCRE_UTF8 and PCRE_DOTALL options being set.
48. For a pattern such as /\babc|\bdef/ pcre_study() was failing to set up the
starting byte set, because \b was not being ignored.
Version 8.12 15-Jan-2011
------------------------
1. Fixed some typos in the markup of the man pages, and wrote a script that
checks for such things as part of the documentation building process.
2. On a big-endian 64-bit system, pcregrep did not correctly process the
--match-limit and --recursion-limit options (added for 8.11). In
particular, this made one of the standard tests fail. (The integer value
went into the wrong half of a long int.)
3. If the --colour option was given to pcregrep with -v (invert match), it
did strange things, either producing crazy output, or crashing. It should,
of course, ignore a request for colour when reporting lines that do not
match.
4. Another pcregrep bug caused similar problems if --colour was specified with
-M (multiline) and the pattern match finished with a line ending.
5. In pcregrep, when a pattern that ended with a literal newline sequence was
matched in multiline mode, the following line was shown as part of the
match. This seems wrong, so I have changed it.
6. Another pcregrep bug in multiline mode, when --colour was specified, caused
the check for further matches in the same line (so they could be coloured)
to overrun the end of the current line. If another match was found, it was
incorrectly shown (and then shown again when found in the next line).
7. If pcregrep was compiled under Windows, there was a reference to the
function pcregrep_exit() before it was defined. I am assuming this was
the cause of the "error C2371: 'pcregrep_exit' : redefinition;" that was
reported by a user. I've moved the definition above the reference.
Version 8.11 10-Dec-2010
------------------------
1. (*THEN) was not working properly if there were untried alternatives prior
to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
backtracked to try for "b" instead of moving to the next alternative branch
at the same level (in this case, to look for "c"). The Perl documentation
is clear that when (*THEN) is backtracked onto, it goes to the "next
alternative in the innermost enclosing group".
2. (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
such as (A(*COMMIT)B(*THEN)C|D) any failure after matching A should
result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
(*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
(*THEN).
3. If \s appeared in a character class, it removed the VT character from
the class, even if it had been included by some previous item, for example
in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
of \s, but is part of the POSIX "space" class.)
4. A partial match never returns an empty string (because you can always
match an empty string at the end of the subject); however the checking for
an empty string was starting at the "start of match" point. This has been
changed to the "earliest inspected character" point, because the returned
data for a partial match starts at this character. This means that, for
example, /(?<=abc)def/ gives a partial match for the subject "abc"
(previously it gave "no match").
5. Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
previously a full match would be given. However, setting PCRE_PARTIAL_HARD
has an implication that the given string is incomplete (because a partial
match is preferred over a full match). For this reason, these items now
give a partial match in this situation. [Aside: previously, the one case
/t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
match rather than a full match, which was wrong by the old rules, but is
now correct.]
6. There was a bug in the handling of #-introduced comments, recognized when
PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
places in pcre_compile().
7. Related to (6) above, when pcre_compile() was skipping #-introduced
comments when looking ahead for named forward references to subpatterns,
the only newline sequence it recognized was NL. It now handles newlines
according to the set newline convention.
8. SunOS4 doesn't have strerror() or strtoul(); pcregrep dealt with the
former, but used strtoul(), whereas pcretest avoided strtoul() but did not
cater for a lack of strerror(). These oversights have been fixed.
9. Added --match-limit and --recursion-limit to pcregrep.
10. Added two casts needed to build with Visual Studio when NO_RECURSE is set.
11. When the -o option was used, pcregrep was setting a return code of 1, even
when matches were found, and --line-buffered was not being honoured.
12. Added an optional parentheses number to the -o and --only-matching options
of pcregrep.
13. Imitating Perl's /g action for multiple matches is tricky when the pattern
can match an empty string. The code to do it in pcretest and pcredemo
needed fixing:
(a) When the newline convention was "crlf", pcretest got it wrong, skipping
only one byte after an empty string match just before CRLF (this case
just got forgotten; "any" and "anycrlf" were OK).
(b) The pcretest code also had a bug, causing it to loop forever in UTF-8
mode when an empty string match preceded an ASCII character followed by
a non-ASCII character. (The code for advancing by one character rather
than one byte was nonsense.)
(c) The pcredemo.c sample program did not have any code at all to handle
the cases when CRLF is a valid newline sequence.
14. Neither pcre_exec() nor pcre_dfa_exec() was checking that the value given
as a starting offset was within the subject string. There is now a new
error, PCRE_ERROR_BADOFFSET, which is returned if the starting offset is
negative or greater than the length of the string. In order to test this,
pcretest is extended to allow the setting of negative starting offsets.
15. In both pcre_exec() and pcre_dfa_exec() the code for checking that the
starting offset points to the beginning of a UTF-8 character was
unnecessarily clumsy. I tidied it up.
16. Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
17. Nobody had reported that the --include_dir option, which was added in
release 7.7 should have been called --include-dir (hyphen, not underscore)
for compatibility with GNU grep. I have changed it to --include-dir, but
left --include_dir as an undocumented synonym, and the same for
--exclude-dir, though that is not available in GNU grep, at least as of
release 2.5.4.
18. At a user's suggestion, the macros GETCHAR and friends (which pick up UTF-8
characters from a string of bytes) have been redefined so as not to use
loops, in order to improve performance in some environments. At the same
time, I abstracted some of the common code into auxiliary macros to save