Code: Select all
ImportC ""
pcre_version(void);
EndImport
regex = CreateRegularExpression(#PB_Any, "")
pcre_version = pcre_version(0)
Debug PeekS(pcre_version)
==> http://pcre.org/changelog.txtKale wrote:What are the changes in the new version?
Maybe you are a little bit lazy?Kale wrote:What are the changes in the new version?
Code: Select all
ChangeLog for PCRE
------------------
Version 7.9 11-Apr-09
---------------------
1. When building with support for bzlib/zlib (pcregrep) and/or readline
(pcretest), all targets were linked against these libraries. This included
libpcre, libpcreposix, and libpcrecpp, even though they do not use these
libraries. This caused unwanted dependencies to be created. This problem
has been fixed, and now only pcregrep is linked with bzlib/zlib and only
pcretest is linked with readline.
2. The "typedef int BOOL" in pcre_internal.h that was included inside the
"#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
moved outside it again, because FALSE and TRUE are already defined in AIX,
but BOOL is not.
3. The pcre_config() function was treating the PCRE_MATCH_LIMIT and
PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
4. The pcregrep documentation said spaces were inserted as well as colons (or
hyphens) following file names and line numbers when outputting matching
lines. This is not true; no spaces are inserted. I have also clarified the
wording for the --colour (or --color) option.
5. In pcregrep, when --colour was used with -o, the list of matching strings
was not coloured; this is different to GNU grep, so I have changed it to be
the same.
6. When --colo(u)r was used in pcregrep, only the first matching substring in
each matching line was coloured. Now it goes on to look for further matches
of any of the test patterns, which is the same behaviour as GNU grep.
7. A pattern that could match an empty string could cause pcregrep to loop; it
doesn't make sense to accept an empty string match in pcregrep, so I have
locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
seems to be how GNU grep behaves.
8. The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
start or after a newline", because the conditional assertion was not being
correctly handled. The rule now is that both the assertion and what follows
in the first alternative must satisfy the test.
9. If auto-callout was enabled in a pattern with a conditional group whose
condition was an assertion, PCRE could crash during matching, both with
pcre_exec() and pcre_dfa_exec().
10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
used for matching.
11. Unicode property support in character classes was not working for
characters (bytes) greater than 127 when not in UTF-8 mode.
12. Added the -M command line option to pcretest.
14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
15. Added the PCRE_NO_START_OPTIMIZE match-time option.
16. Added comments and documentation about mis-use of no_arg in the C++
wrapper.
17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
from Martin Jerabek that uses macro names for all relevant character and
string constants.
18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
these, but not everybody uses configure.
19. A conditional group that had only one branch was not being correctly
recognized as an item that could match an empty string. This meant that an
enclosing group might also not be so recognized, causing infinite looping
(and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
with the subject "ab", where knowledge that the repeated group can match
nothing is needed in order to break the loop.
20. If a pattern that was compiled with callouts was matched using pcre_dfa_
exec(), but without supplying a callout function, matching went wrong.
21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
leak if the size of the offset vector was greater than 30. When the vector
is smaller, the saved offsets during recursion go onto a local stack
vector, but for larger vectors malloc() is used. It was failing to free
when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
error, in fact).
22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
heapframe that is used only when UTF-8 support is enabled. This caused no
problem, but was untidy.
23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
included within another project.
24. Steven Van Ingelgem's patches to add more options to the CMake support,
slightly modified by me:
(a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
not building pcregrep.
(b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
25. Forward references, both numeric and by name, in patterns that made use of
duplicate group numbers, could behave incorrectly or give incorrect errors,
because when scanning forward to find the reference group, PCRE was not
taking into account the duplicate group numbers. A pattern such as
^X(?3)(a)(?|(b)|(q))(Y) is an example.
26. Changed a few more instances of "const unsigned char *" to USPTR, making
the feature of a custom pointer more persuasive (as requested by a user).
27. Wrapped the definitions of fileno and isatty for Windows, which appear in
pcretest.c, inside #ifndefs, because it seems they are sometimes already
pre-defined.
28. Added support for (*UTF8) at the start of a pattern.
29. Arrange for flags added by the "release type" setting in CMake to be shown
in the configuration summary.
Version 7.8 05-Sep-08
---------------------
1. Replaced UCP searching code with optimized version as implemented for Ad
Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
stage table and inline lookup instead of a function, giving speed ups of 2
to 5 times on some simple patterns that I tested. Permission was given to
distribute the MultiStage2.py script that generates the tables (it's not in
the tarball, but is in the Subversion repository).
2. Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
scripts.
3. Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
a group with a zero qualifier. The result of the study could be incorrect,
or the function might crash, depending on the pattern.
4. Caseless matching was not working for non-ASCII characters in back
references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
It now works when Unicode Property Support is available.
5. In pcretest, an escape such as \x{de} in the data was always generating
a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
non-UTF-8 mode. If the value is greater than 255, it gives a warning about
truncation.
6. Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
7. Added two (int) casts to pcregrep when printing the difference of two
pointers, in case they are 64-bit values.
8. Added comments about Mac OS X stack usage to the pcrestack man page and to
test 2 if it fails.
9. Added PCRE_CALL_CONVENTION just before the names of all exported functions,
and a #define of that name to empty if it is not externally set. This is to
allow users of MSVC to set it if necessary.
10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
the convenience functions in the pcre_get.c source file.
11. An option change at the start of a pattern that had top-level alternatives
could cause overwriting and/or a crash. This command provoked a crash in
some environments:
printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
This potential security problem was recorded as CVE-2008-2371.
12. For a pattern where the match had to start at the beginning or immediately
after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
pcre_dfa_exec() could read past the end of the passed subject if there was
no match. To help with detecting such bugs (e.g. with valgrind), I modified
pcretest so that it places the subject at the end of its malloc-ed buffer.
13. The change to pcretest in 12 above threw up a couple more cases when pcre_
exec() might read past the end of the data buffer in UTF-8 mode.
14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
the data contained the byte 0x85 as part of a UTF-8 character within its
first line. This applied both to normal and DFA matching.
15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
/^[^d]*?$/8 failed to match "abc".
16. Added a missing copyright notice to pcrecpp_internal.h.
17. Make it more clear in the documentation that values returned from
pcre_exec() in ovector are byte offsets, not character counts.
18. Tidied a few places to stop certain compilers from issuing warnings.
19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
supplied by Stefan Weber. I made a further small update for 7.8 because
there is a change of source arrangements: the pcre_searchfuncs.c module is
replaced by pcre_ucd.c.
Version 7.7 07-May-08
---------------------
1. Applied Craig's patch to sort out a long long problem: "If we can't convert
a string to a long long, pretend we don't even have a long long." This is
done by checking for the strtoq, strtoll, and _strtoi64 functions.
2. Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
pre-7.6 versions, which defined a global no_arg variable instead of putting
it in the RE class. (See also #8 below.)
3. Remove a line of dead code, identified by coverity and reported by Nuno
Lopes.
4. Fixed two related pcregrep bugs involving -r with --include or --exclude:
(1) The include/exclude patterns were being applied to the whole pathnames
of files, instead of just to the final components.
(2) If there was more than one level of directory, the subdirectories were
skipped unless they satisfied the include/exclude conditions. This is
inconsistent with GNU grep (and could even be seen as contrary to the
pcregrep specification - which I improved to make it absolutely clear).
The action now is always to scan all levels of directory, and just
apply the include/exclude patterns to regular files.
5. Added the --include_dir and --exclude_dir patterns to pcregrep, and used
--exclude_dir in the tests to avoid scanning .svn directories.
6. Applied Craig's patch to the QuoteMeta function so that it escapes the
NUL character as backslash + 0 rather than backslash + NUL, because PCRE
doesn't support NULs in patterns.
7. Added some missing "const"s to declarations of static tables in
pcre_compile.c and pcre_dfa_exec.c.
8. Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
caused by fix #2 above. (Subsequently also a second patch to fix the
first patch. And a third patch - this was a messy problem.)
9. Applied Craig's patch to remove the use of push_back().
10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
matching function regexec().
11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
which, however, unlike Perl's \g{...}, are subroutine calls, not back
references. PCRE supports relative numbers with this syntax (I don't think
Oniguruma does).
12. Previously, a group with a zero repeat such as (...){0} was completely
omitted from the compiled regex. However, this means that if the group
was called as a subroutine from elsewhere in the pattern, things went wrong
(an internal error was given). Such groups are now left in the compiled
pattern, with a new opcode that causes them to be skipped at execution
time.
13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
to the way PCRE behaves:
(a) A lone ] character is dis-allowed (Perl treats it as data).
(b) A back reference to an unmatched subpattern matches an empty string
(Perl fails the current match path).
(c) A data ] in a character class must be notated as \] because if the
first data character in a class is ], it defines an empty class. (In
Perl it is not possible to have an empty class.) The empty class []
never matches; it forces failure and is equivalent to (*FAIL) or (?!).
The negative empty class [^] matches any one character, independently
of the DOTALL setting.
14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
non-existent subpattern following a character class starting with ']' and
containing () gave an internal compiling error instead of "reference to
non-existent subpattern". Fortunately, when the pattern did exist, the
compiled code was correct. (When scanning forwards to check for the
existencd of the subpattern, it was treating the data ']' as terminating
the class, so got the count wrong. When actually compiling, the reference
was subsequently set up correctly.)
15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
it was being rejected as not supported by pcre_dfa_exec(), even though
other assertions are supported. I have made pcre_dfa_exec() support
(*FAIL).
16. The implementation of 13c above involved the invention of a new opcode,
OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
cannot be changed at match time, I realized I could make a small
improvement to matching performance by compiling OP_ALLANY instead of
OP_ANY for "." when DOTALL was set, and then removing the runtime tests
on the OP_ANY path.
17. Compiling pcretest on Windows with readline support failed without the
following two fixes: (1) Make the unistd.h include conditional on
HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
ncurses library to be included for pcretest when ReadLine support is
requested, but also to allow for it to be overridden. This patch came from
Daniel Bergström.
19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
any errors with the current Unicode tables. Thanks to Peter Kankowski for
spotting this.
Version 7.6 28-Jan-08
---------------------
1. A character class containing a very large number of characters with
codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
overflow.
2. Patch to cut out the "long long" test in pcrecpp_unittest when
HAVE_LONG_LONG is not defined.
3. Applied Christian Ehrlicher's patch to update the CMake build files to
bring them up to date and include new features. This patch includes:
- Fixed PH's badly added libz and libbz2 support.
- Fixed a problem with static linking.
- Added pcredemo. [But later removed - see 7 below.]
- Fixed dftables problem and added an option.
- Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
HAVE_LONG_LONG.
- Added readline support for pcretest.
- Added an listing of the option settings after cmake has run.
4. A user submitted a patch to Makefile that makes it easy to create
"pcre.dll" under mingw when using Configure/Make. I added stuff to
Makefile.am that cause it to include this special target, without
affecting anything else. Note that the same mingw target plus all
the other distribution libraries and programs are now supported
when configuring with CMake (see 6 below) instead of with
Configure/Make.
5. Applied Craig's patch that moves no_arg into the RE class in the C++ code.
This is an attempt to solve the reported problem "pcrecpp::no_arg is not
exported in the Windows port". It has not yet been confirmed that the patch
solves the problem, but it does no harm.
6. Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
with CMake, and also correct the comment about stack recursion.
7. Remove the automatic building of pcredemo from the ./configure system and
from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
of a program that users should build themselves after PCRE is installed, so
building it automatically is not really right. What is more, it gave
trouble in some build environments.
8. Further tidies to CMakeLists.txt from Sheri and Christian.
Version 7.5 10-Jan-08
---------------------
1. Applied a patch from Craig: "This patch makes it possible to 'ignore'
values in parens when parsing an RE using the C++ wrapper."
2. Negative specials like \S did not work in character classes in UTF-8 mode.
Characters greater than 255 were excluded from the class instead of being
included.
3. The same bug as (2) above applied to negated POSIX classes such as
[:^space:].
4. PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
defined or documented. It seems to have been a typo for PCRE_STATIC, so
I have changed it.
5. The construct (?&) was not diagnosed as a syntax error (it referenced the
first named subpattern) and a construct such as (?&a) would reference the
first named subpattern whose name started with "a" (in other words, the
length check was missing). Both these problems are fixed. "Subpattern name
expected" is now given for (?&) (a zero-length name), and this patch also
makes it give the same error for \k'' (previously it complained that that
was a reference to a non-existent subpattern).
6. The erroneous patterns (?+-a) and (?-+a) give different error messages;
this is right because (?- can be followed by option settings as well as by
digits. I have, however, made the messages clearer.
7. Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
than the number used in the conditional) now cause a compile-time error.
This is actually not compatible with Perl, which accepts such patterns, but
treats the conditional as always being FALSE (as PCRE used to), but it
seems to me that giving a diagnostic is better.
8. Change "alphameric" to the more common word "alphanumeric" in comments
and messages.
9. Fix two occurrences of "backslash" in comments that should have been
"backspace".
10. Remove two redundant lines of code that can never be obeyed (their function
was moved elsewhere).
11. The program that makes PCRE's Unicode character property table had a bug
which caused it to generate incorrect table entries for sequences of
characters that have the same character type, but are in different scripts.
It amalgamated them into a single range, with the script of the first of
them. In other words, some characters were in the wrong script. There were
thirteen such cases, affecting characters in the following ranges:
U+002b0 - U+002c1
U+0060c - U+0060d
U+0061e - U+00612
U+0064b - U+0065e
U+0074d - U+0076d
U+01800 - U+01805
U+01d00 - U+01d77
U+01d9b - U+01dbf
U+0200b - U+0200f
U+030fc - U+030fe
U+03260 - U+0327f
U+0fb46 - U+0fbb1
U+10450 - U+1049d
12. The -o option (show only the matching part of a line) for pcregrep was not
compatible with GNU grep in that, if there was more than one match in a
line, it showed only the first of them. It now behaves in the same way as
GNU grep.
13. If the -o and -v options were combined for pcregrep, it printed a blank
line for every non-matching line. GNU grep prints nothing, and pcregrep now
does the same. The return code can be used to tell if there were any
non-matching lines.
14. Added --file-offsets and --line-offsets to pcregrep.
15. The pattern (?=something)(?R) was not being diagnosed as a potentially
infinitely looping recursion. The bug was that positive lookaheads were not
being skipped when checking for a possible empty match (negative lookaheads
and both kinds of lookbehind were skipped).
16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
inclusion of <windows.h> to before rather than after the definition of
INVALID_FILE_ATTRIBUTES (patch from David Byron).
17. Specifying a possessive quantifier with a specific limit for a Unicode
character property caused pcre_compile() to compile bad code, which led at
runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
caused the error; without that there was no problem.
18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
19. Added --enable-pcretest-libreadline.
20. In pcrecpp.cc, the variable 'count' was incremented twice in
RE::GlobalReplace(). As a result, the number of replacements returned was
double what it should be. I removed one of the increments, but Craig sent a
later patch that removed the other one (the right fix) and added unit tests
that check the return values (which was not done before).
21. Several CMake things:
(1) Arranged that, when cmake is used on Unix, the libraries end up with
the names libpcre and libpcreposix, not just pcre and pcreposix.
(2) The above change means that pcretest and pcregrep are now correctly
linked with the newly-built libraries, not previously installed ones.
(3) Added PCRE_SUPPORT_LIBREADLINE, PCRE_SUPPORT_LIBZ, PCRE_SUPPORT_LIBBZ2.
22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
UTF-8 newline character). The key issue is that the pattern starts .*;
this means that the match must be either at the beginning, or after a
newline. The bug was in the code for advancing after a failed match and
checking that the new position followed a newline. It was not taking
account of UTF-8 characters correctly.
23. PCRE was behaving differently from Perl in the way it recognized POSIX
character classes. PCRE was not treating the sequence [:...:] as a
character class unless the ... were all letters. Perl, however, seems to
allow any characters between [: and :], though of course it rejects as
unknown any "names" that contain non-letters, because all the known class
names consist only of letters. Thus, Perl gives an error for [[:1234:]],
for example, whereas PCRE did not - it did not recognize a POSIX character
class. This seemed a bit dangerous, so the code has been changed to be
closer to Perl. The behaviour is not identical to Perl, because PCRE will
diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
Perl does, and where it didn't before.
24. Rewrite so as to remove the single use of %n from pcregrep because in some
Windows environments %n is disabled by default.
Version 7.4 21-Sep-07
---------------------
1. Change 7.3/28 was implemented for classes by looking at the bitmap. This
means that a class such as [\s] counted as "explicit reference to CR or
LF". That isn't really right - the whole point of the change was to try to
help when there was an actual mention of one of the two characters. So now
the change happens only if \r or \n (or a literal CR or LF) character is
encountered.
2. The 32-bit options word was also used for 6 internal flags, but the numbers
of both had grown to the point where there were only 3 bits left.
Fortunately, there was spare space in the data structure, and so I have
moved the internal flags into a new 16-bit field to free up more option
bits.
3. The appearance of (?J) at the start of a pattern set the DUPNAMES option,
but did not set the internal JCHANGED flag - either of these is enough to
control the way the "get" function works - but the PCRE_INFO_JCHANGED
facility is supposed to tell if (?J) was ever used, so now (?J) at the
start sets both bits.
4. Added options (at build time, compile time, exec time) to change \R from
matching any Unicode line ending sequence to just matching CR, LF, or CRLF.
5. doc/pcresyntax.html was missing from the distribution.
6. Put back the definition of PCRE_ERROR_NULLWSLIMIT, for backward
compatibility, even though it is no longer used.
7. Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and
strtoull to pcrecpp.cc to select the available functions in WIN32 when the
windows.h file is present (where different names are used). [This was
reversed later after testing - see 16 below.]
8. Changed all #include <config.h> to #include "config.h". There were also
some further <pcre.h> cases that I changed to "pcre.h".
9. When pcregrep was used with the --colour option, it missed the line ending
sequence off the lines that it output.
10. It was pointed out to me that arrays of string pointers cause lots of
relocations when a shared library is dynamically loaded. A technique of
using a single long string with a table of offsets can drastically reduce
these. I have refactored PCRE in four places to do this. The result is
dramatic:
Originally: 290
After changing UCP table: 187
After changing error message table: 43
After changing table of "verbs" 36
After changing table of Posix names 22
Thanks to the folks working on Gregex for glib for this insight.
11. --disable-stack-for-recursion caused compiling to fail unless -enable-
unicode-properties was also set.
12. Updated the tests so that they work when \R is defaulted to ANYCRLF.
13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously
checked only for CRLF.
14. Added casts to pcretest.c to avoid compiler warnings.
15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
entirely. This removes changes made in 7 above.
17. The CMake files have been updated, and there is now more information about
building with CMake in the NON-UNIX-USE document.
Version 7.3 28-Aug-07
---------------------
1. In the rejigging of the build system that eventually resulted in 7.1, the
line "#include <pcre.h>" was included in pcre_internal.h. The use of angle
brackets there is not right, since it causes compilers to look for an
installed pcre.h, not the version that is in the source that is being
compiled (which of course may be different). I have changed it back to:
#include "pcre.h"
I have a vague recollection that the change was concerned with compiling in
different directories, but in the new build system, that is taken care of
by the VPATH setting the Makefile.
2. The pattern .*$ when run in not-DOTALL UTF-8 mode with newline=any failed
when the subject happened to end in the byte 0x85 (e.g. if the last
character was \x{1ec5}). *Character* 0x85 is one of the "any" newline
characters but of course it shouldn't be taken as a newline when it is part
of another character. The bug was that, for an unlimited repeat of . in
not-DOTALL UTF-8 mode, PCRE was advancing by bytes rather than by
characters when looking for a newline.
3. A small performance improvement in the DOTALL UTF-8 mode .* case.
4. Debugging: adjusted the names of opcodes for different kinds of parentheses
in debug output.
5. Arrange to use "%I64d" instead of "%lld" and "%I64u" instead of "%llu" for
long printing in the pcrecpp unittest when running under MinGW.
6. ESC_K was left out of the EBCDIC table.
7. Change 7.0/38 introduced a new limit on the number of nested non-capturing
parentheses; I made it 1000, which seemed large enough. Unfortunately, the
limit also applies to "virtual nesting" when a pattern is recursive, and in
this case 1000 isn't so big. I have been able to remove this limit at the
expense of backing off one optimization in certain circumstances. Normally,
when pcre_exec() would call its internal match() function recursively and
immediately return the result unconditionally, it uses a "tail recursion"
feature to save stack. However, when a subpattern that can match an empty
string has an unlimited repetition quantifier, it no longer makes this
optimization. That gives it a stack frame in which to save the data for
checking that an empty string has been matched. Previously this was taken
from the 1000-entry workspace that had been reserved. So now there is no
explicit limit, but more stack is used.
8. Applied Daniel's patches to solve problems with the import/export magic
syntax that is required for Windows, and which was going wrong for the
pcreposix and pcrecpp parts of the library. These were overlooked when this
problem was solved for the main library.
9. There were some crude static tests to avoid integer overflow when computing
the size of patterns that contain repeated groups with explicit upper
limits. As the maximum quantifier is 65535, the maximum group length was
set at 30,000 so that the product of these two numbers did not overflow a
32-bit integer. However, it turns out that people want to use groups that
are longer than 30,000 bytes (though not repeat them that many times).
Change 7.0/17 (the refactoring of the way the pattern size is computed) has
made it possible to implement the integer overflow checks in a much more
dynamic way, which I have now done. The artificial limitation on group
length has been removed - we now have only the limit on the total length of
the compiled pattern, which depends on the LINK_SIZE setting.
10. Fixed a bug in the documentation for get/copy named substring when
duplicate names are permitted. If none of the named substrings are set, the
functions return PCRE_ERROR_NOSUBSTRING (7); the doc said they returned an
empty string.
11. Because Perl interprets \Q...\E at a high level, and ignores orphan \E
instances, patterns such as [\Q\E] or [\E] or even [^\E] cause an error,
because the ] is interpreted as the first data character and the
terminating ] is not found. PCRE has been made compatible with Perl in this
regard. Previously, it interpreted [\Q\E] as an empty class, and [\E] could
cause memory overwriting.
10. Like Perl, PCRE automatically breaks an unlimited repeat after an empty
string has been matched (to stop an infinite loop). It was not recognizing
a conditional subpattern that could match an empty string if that
subpattern was within another subpattern. For example, it looped when
trying to match (((?(1)X|))*) but it was OK with ((?(1)X|)*) where the
condition was not nested. This bug has been fixed.
12. A pattern like \X?\d or \P{L}?\d in non-UTF-8 mode could cause a backtrack
past the start of the subject in the presence of bytes with the top bit
set, for example "\x8aBCD".
13. Added Perl 5.10 experimental backtracking controls (*FAIL), (*F), (*PRUNE),
(*SKIP), (*THEN), (*COMMIT), and (*ACCEPT).
14. Optimized (?!) to (*FAIL).
15. Updated the test for a valid UTF-8 string to conform to the later RFC 3629.
This restricts code points to be within the range 0 to 0x10FFFF, excluding
the "low surrogate" sequence 0xD800 to 0xDFFF. Previously, PCRE allowed the
full range 0 to 0x7FFFFFFF, as defined by RFC 2279. Internally, it still
does: it's just the validity check that is more restrictive.
16. Inserted checks for integer overflows during escape sequence (backslash)
processing, and also fixed erroneous offset values for syntax errors during
backslash processing.
17. Fixed another case of looking too far back in non-UTF-8 mode (cf 12 above)
for patterns like [\PPP\x8a]{1,}\x80 with the subject "A\x80".
18. An unterminated class in a pattern like (?1)\c[ with a "forward reference"
caused an overrun.
19. A pattern like (?:[\PPa*]*){8,} which had an "extended class" (one with
something other than just ASCII characters) inside a group that had an
unlimited repeat caused a loop at compile time (while checking to see
whether the group could match an empty string).
20. Debugging a pattern containing \p or \P could cause a crash. For example,
[\P{Any}] did so. (Error in the code for printing property names.)
21. An orphan \E inside a character class could cause a crash.
22. A repeated capturing bracket such as (A)? could cause a wild memory
reference during compilation.
23. There are several functions in pcre_compile() that scan along a compiled
expression for various reasons (e.g. to see if it's fixed length for look
behind). There were bugs in these functions when a repeated \p or \P was
present in the pattern. These operators have additional parameters compared
with \d, etc, and these were not being taken into account when moving along
the compiled data. Specifically:
(a) A item such as \p{Yi}{3} in a lookbehind was not treated as fixed
length.
(b) An item such as \pL+ within a repeated group could cause crashes or
loops.
(c) A pattern such as \p{Yi}+(\P{Yi}+)(?1) could give an incorrect
"reference to non-existent subpattern" error.
(d) A pattern like (\P{Yi}{2}\277)? could loop at compile time.
24. A repeated \S or \W in UTF-8 mode could give wrong answers when multibyte
characters were involved (for example /\S{2}/8g with "A\x{a3}BC").
25. Using pcregrep in multiline, inverted mode (-Mv) caused it to loop.
26. Patterns such as [\P{Yi}A] which include \p or \P and just one other
character were causing crashes (broken optimization).
27. Patterns such as (\P{Yi}*\277)* (group with possible zero repeat containing
\p or \P) caused a compile-time loop.
28. More problems have arisen in unanchored patterns when CRLF is a valid line
break. For example, the unstudied pattern [\r\n]A does not match the string
"\r\nA" because change 7.0/46 below moves the current point on by two
characters after failing to match at the start. However, the pattern \nA
*does* match, because it doesn't start till \n, and if [\r\n]A is studied,
the same is true. There doesn't seem any very clean way out of this, but
what I have chosen to do makes the common cases work: PCRE now takes note
of whether there can be an explicit match for \r or \n anywhere in the
pattern, and if so, 7.0/46 no longer applies. As part of this change,
there's a new PCRE_INFO_HASCRORLF option for finding out whether a compiled
pattern has explicit CR or LF references.
29. Added (*CR) etc for changing newline setting at start of pattern.
Version 7.2 19-Jun-07
---------------------
1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
which is apparently normally available under Windows.
2. Re-jig the pcregrep tests with different newline settings in an attempt
to make them independent of the local environment's newline setting.
3. Add code to configure.ac to remove -g from the CFLAGS default settings.
4. Some of the "internals" tests were previously cut out when the link size
was not 2, because the output contained actual offsets. The recent new
"Z" feature of pcretest means that these can be cut out, making the tests
usable with all link sizes.
5. Implemented Stan Switzer's goto replacement for longjmp() when not using
stack recursion. This gives a massive performance boost under BSD, but just
a small improvement under Linux. However, it saves one field in the frame
in all cases.
6. Added more features from the forthcoming Perl 5.10:
(a) (?-n) (where n is a string of digits) is a relative subroutine or
recursion call. It refers to the nth most recently opened parentheses.
(b) (?+n) is also a relative subroutine call; it refers to the nth next
to be opened parentheses.
(c) Conditions that refer to capturing parentheses can be specified
relatively, for example, (?(-2)... or (?(+3)...
(d) \K resets the start of the current match so that everything before
is not part of it.
(e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
(f) \g{name} is another synonym - part of Perl 5.10's unification of
reference syntax.
(g) (?| introduces a group in which the numbering of parentheses in each
alternative starts with the same number.
(h) \h, \H, \v, and \V match horizontal and vertical whitespace.
7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
PCRE_INFO_JCHANGED.
8. A pattern such as (.*(.)?)* caused pcre_exec() to fail by either not
terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
for detecting groups that can match an empty string.
9. A pattern with a very large number of alternatives (more than several
hundred) was running out of internal workspace during the pre-compile
phase, where pcre_compile() figures out how much memory will be needed. A
bit of new cunning has reduced the workspace needed for groups with
alternatives. The 1000-alternative test pattern now uses 12 bytes of
workspace instead of running out of the 4096 that are available.
10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
11. Applied patch from Google to remove an optimization that didn't quite work.
The report of the bug said:
pcrecpp::RE("a*").FullMatch("aaa") matches, while
pcrecpp::RE("a*?").FullMatch("aaa") does not, and
pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
it matched the wrong number of bytes.
Version 7.1 24-Apr-07
---------------------
* please look at web page *
Code: Select all
- Updated: OGRE to 1.6.2, sqlite 3.6.14.2
- Updated: pcre (RegEx) 7.9 2009-4-11