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ChangeLog for PCRE |
ChangeLog for PCRE |
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Version 3.0 01-Feb-00 |
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--------------------- |
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1. Add support for the /+ modifier to perltest (to output $` like it does in |
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pcretest). |
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2. Add support for the /g modifier to perltest. |
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3. Fix pcretest so that it behaves even more like Perl for /g when the pattern |
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matches null strings. |
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4. Fix perltest so that it doesn't do unwanted things when fed an empty |
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pattern. Perl treats empty patterns specially - it reuses the most recent |
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pattern, which is not what we want. Replace // by /(?#)/ in order to avoid this |
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effect. |
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5. The POSIX interface was broken in that it was just handing over the POSIX |
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captured string vector to pcre_exec(), but (since release 2.00) PCRE has |
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required a bigger vector, with some working space on the end. This means that |
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the POSIX wrapper now has to get and free some memory, and copy the results. |
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6. Added some simple autoconf support, placing the test data and the |
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documentation in separate directories, re-organizing some of the |
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information files, and making it build pcre-config (a GNU standard). Also added |
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libtool support for building PCRE as a shared library, which is now the |
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default. |
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7. Got rid of the leading zero in the definition of PCRE_MINOR because 08 and |
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09 are not valid octal constants. Single digits will be used for minor values |
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less than 10. |
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8. Defined REG_EXTENDED and REG_NOSUB as zero in the POSIX header, so that |
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existing programs that set these in the POSIX interface can use PCRE without |
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modification. |
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9. Added a new function, pcre_fullinfo() with an extensible interface. It can |
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return all that pcre_info() returns, plus additional data. The pcre_info() |
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function is retained for compatibility, but is considered to be obsolete. |
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10. Added experimental recursion feature (?R) to handle one common case that |
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Perl 5.6 will be able to do with (?p{...}). |
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11. Added support for POSIX character classes like [:alpha:], which Perl is |
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adopting. |
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Version 2.08 31-Aug-99 |
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---------------------- |
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1. When startoffset was not zero and the pattern began with ".*", PCRE was not |
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trying to match at the startoffset position, but instead was moving forward to |
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the next newline as if a previous match had failed. |
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2. pcretest was not making use of PCRE_NOTEMPTY when repeating for /g and /G, |
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and could get into a loop if a null string was matched other than at the start |
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of the subject. |
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3. Added definitions of PCRE_MAJOR and PCRE_MINOR to pcre.h so the version can |
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be distinguished at compile time, and for completeness also added PCRE_DATE. |
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5. Added Paul Sokolovsky's minor changes to make it easy to compile a Win32 DLL |
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in GnuWin32 environments. |
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Version 2.07 29-Jul-99 |
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---------------------- |
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1. The documentation is now supplied in plain text form and HTML as well as in |
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the form of man page sources. |
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2. C++ compilers don't like assigning (void *) values to other pointer types. |
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In particular this affects malloc(). Although there is no problem in Standard |
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C, I've put in casts to keep C++ compilers happy. |
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3. Typo on pcretest.c; a cast of (unsigned char *) in the POSIX regexec() call |
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should be (const char *). |
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4. If NOPOSIX is defined, pcretest.c compiles without POSIX support. This may |
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be useful for non-Unix systems who don't want to bother with the POSIX stuff. |
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However, I haven't made this a standard facility. The documentation doesn't |
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mention it, and the Makefile doesn't support it. |
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5. The Makefile now contains an "install" target, with editable destinations at |
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the top of the file. The pcretest program is not installed. |
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6. pgrep -V now gives the PCRE version number and date. |
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7. Fixed bug: a zero repetition after a literal string (e.g. /abcde{0}/) was |
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causing the entire string to be ignored, instead of just the last character. |
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8. If a pattern like /"([^\\"]+|\\.)*"/ is applied in the normal way to a |
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non-matching string, it can take a very, very long time, even for strings of |
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quite modest length, because of the nested recursion. PCRE now does better in |
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some of these cases. It does this by remembering the last required literal |
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character in the pattern, and pre-searching the subject to ensure it is present |
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before running the real match. In other words, it applies a heuristic to detect |
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some types of certain failure quickly, and in the above example, if presented |
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with a string that has no trailing " it gives "no match" very quickly. |
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9. A new runtime option PCRE_NOTEMPTY causes null string matches to be ignored; |
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other alternatives are tried instead. |
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Version 2.06 09-Jun-99 |
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---------------------- |
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1. Change pcretest's output for amount of store used to show just the code |
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space, because the remainder (the data block) varies in size between 32-bit and |
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64-bit systems. |
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2. Added an extra argument to pcre_exec() to supply an offset in the subject to |
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start matching at. This allows lookbehinds to work when searching for multiple |
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occurrences in a string. |
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3. Added additional options to pcretest for testing multiple occurrences: |
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/+ outputs the rest of the string that follows a match |
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/g loops for multiple occurrences, using the new startoffset argument |
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/G loops for multiple occurrences by passing an incremented pointer |
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4. PCRE wasn't doing the "first character" optimization for patterns starting |
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with \b or \B, though it was doing it for other lookbehind assertions. That is, |
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it wasn't noticing that a match for a pattern such as /\bxyz/ has to start with |
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the letter 'x'. On long subject strings, this gives a significant speed-up. |
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Version 2.05 21-Apr-99 |
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---------------------- |
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1. Changed the type of magic_number from int to long int so that it works |
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properly on 16-bit systems. |
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2. Fixed a bug which caused patterns starting with .* not to work correctly |
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when the subject string contained newline characters. PCRE was assuming |
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anchoring for such patterns in all cases, which is not correct because .* will |
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not pass a newline unless PCRE_DOTALL is set. It now assumes anchoring only if |
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DOTALL is set at top level; otherwise it knows that patterns starting with .* |
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must be retried after every newline in the subject. |
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Version 2.04 18-Feb-99 |
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---------------------- |
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1. For parenthesized subpatterns with repeats whose minimum was zero, the |
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computation of the store needed to hold the pattern was incorrect (too large). |
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If such patterns were nested a few deep, this could multiply and become a real |
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problem. |
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2. Added /M option to pcretest to show the memory requirement of a specific |
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pattern. Made -m a synonym of -s (which does this globally) for compatibility. |
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3. Subpatterns of the form (regex){n,m} (i.e. limited maximum) were being |
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compiled in such a way that the backtracking after subsequent failure was |
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pessimal. Something like (a){0,3} was compiled as (a)?(a)?(a)? instead of |
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((a)((a)(a)?)?)? with disastrous performance if the maximum was of any size. |
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Version 2.03 02-Feb-99 |
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---------------------- |
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1. Fixed typo and small mistake in man page. |
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2. Added 4th condition (GPL supersedes if conflict) and created separate |
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LICENCE file containing the conditions. |
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3. Updated pcretest so that patterns such as /abc\/def/ work like they do in |
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Perl, that is the internal \ allows the delimiter to be included in the |
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pattern. Locked out the use of \ as a delimiter. If \ immediately follows |
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the final delimiter, add \ to the end of the pattern (to test the error). |
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4. Added the convenience functions for extracting substrings after a successful |
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match. Updated pcretest to make it able to test these functions. |
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Version 2.02 14-Jan-99 |
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---------------------- |
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1. Initialized the working variables associated with each extraction so that |
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their saving and restoring doesn't refer to uninitialized store. |
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2. Put dummy code into study.c in order to trick the optimizer of the IBM C |
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compiler for OS/2 into generating correct code. Apparently IBM isn't going to |
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fix the problem. |
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3. Pcretest: the timing code wasn't using LOOPREPEAT for timing execution |
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calls, and wasn't printing the correct value for compiling calls. Increased the |
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default value of LOOPREPEAT, and the number of significant figures in the |
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times. |
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4. Changed "/bin/rm" in the Makefile to "-rm" so it works on Windows NT. |
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5. Renamed "deftables" as "dftables" to get it down to 8 characters, to avoid |
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a building problem on Windows NT with a FAT file system. |
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Version 2.01 21-Oct-98 |
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---------------------- |
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1. Changed the API for pcre_compile() to allow for the provision of a pointer |
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to character tables built by pcre_maketables() in the current locale. If NULL |
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is passed, the default tables are used. |
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Version 2.00 24-Sep-98 |
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---------------------- |
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1. Since the (>?) facility is in Perl 5.005, don't require PCRE_EXTRA to enable |
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it any more. |
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2. Allow quantification of (?>) groups, and make it work correctly. |
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3. The first character computation wasn't working for (?>) groups. |
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4. Correct the implementation of \Z (it is permitted to match on the \n at the |
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end of the subject) and add 5.005's \z, which really does match only at the |
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very end of the subject. |
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5. Remove the \X "cut" facility; Perl doesn't have it, and (?> is neater. |
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6. Remove the ability to specify CASELESS, MULTILINE, DOTALL, and |
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DOLLAR_END_ONLY at runtime, to make it possible to implement the Perl 5.005 |
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localized options. All options to pcre_study() were also removed. |
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7. Add other new features from 5.005: |
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$(?<= positive lookbehind |
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$(?<! negative lookbehind |
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(?imsx-imsx) added the unsetting capability |
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such a setting is global if at outer level; local otherwise |
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(?imsx-imsx:) non-capturing groups with option setting |
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(?(cond)re|re) conditional pattern matching |
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A backreference to itself in a repeated group matches the previous |
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captured string. |
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8. General tidying up of studying (both automatic and via "study") |
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consequential on the addition of new assertions. |
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9. As in 5.005, unlimited repeated groups that could match an empty substring |
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are no longer faulted at compile time. Instead, the loop is forcibly broken at |
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runtime if any iteration does actually match an empty substring. |
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10. Include the RunTest script in the distribution. |
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11. Added tests from the Perl 5.005_02 distribution. This showed up a few |
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discrepancies, some of which were old and were also with respect to 5.004. They |
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have now been fixed. |
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Version 1.09 28-Apr-98 |
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---------------------- |
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1. A negated single character class followed by a quantifier with a minimum |
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value of one (e.g. [^x]{1,6} ) was not compiled correctly. This could lead to |
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program crashes, or just wrong answers. This did not apply to negated classes |
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containing more than one character, or to minima other than one. |
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Version 1.08 27-Mar-98 |
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---------------------- |
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1. Add PCRE_UNGREEDY to invert the greediness of quantifiers. |
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2. Add (?U) and (?X) to set PCRE_UNGREEDY and PCRE_EXTRA respectively. The |
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latter must appear before anything that relies on it in the pattern. |
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Version 1.07 16-Feb-98 |
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---------------------- |
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1. A pattern such as /((a)*)*/ was not being diagnosed as in error (unlimited |
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repeat of a potentially empty string). |
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Version 1.06 23-Jan-98 |
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---------------------- |
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1. Added Markus Oberhumer's little patches for C++. |
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2. Literal strings longer than 255 characters were broken. |
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Version 1.05 23-Dec-97 |
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---------------------- |
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1. Negated character classes containing more than one character were failing if |
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PCRE_CASELESS was set at run time. |
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Version 1.04 19-Dec-97 |
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---------------------- |
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1. Corrected the man page, where some "const" qualifiers had been omitted. |
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2. Made debugging output print "{0,xxx}" instead of just "{,xxx}" to agree with |
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input syntax. |
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3. Fixed memory leak which occurred when a regex with back references was |
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matched with an offsets vector that wasn't big enough. The temporary memory |
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that is used in this case wasn't being freed if the match failed. |
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4. Tidied pcretest to ensure it frees memory that it gets. |
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5. Temporary memory was being obtained in the case where the passed offsets |
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vector was exactly big enough. |
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6. Corrected definition of offsetof() from change 5 below. |
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7. I had screwed up change 6 below and broken the rules for the use of |
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setjmp(). Now fixed. |
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Version 1.03 18-Dec-97 |
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---------------------- |
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1. A erroneous regex with a missing opening parenthesis was correctly |
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diagnosed, but PCRE attempted to access brastack[-1], which could cause crashes |
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on some systems. |
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2. Replaced offsetof(real_pcre, code) by offsetof(real_pcre, code[0]) because |
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it was reported that one broken compiler failed on the former because "code" is |
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also an independent variable. |
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3. The erroneous regex a[]b caused an array overrun reference. |
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4. A regex ending with a one-character negative class (e.g. /[^k]$/) did not |
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fail on data ending with that character. (It was going on too far, and checking |
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the next character, typically a binary zero.) This was specific to the |
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optimized code for single-character negative classes. |
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5. Added a contributed patch from the TIN world which does the following: |
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+ Add an undef for memmove, in case the the system defines a macro for it. |
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+ Add a definition of offsetof(), in case there isn't one. (I don't know |
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the reason behind this - offsetof() is part of the ANSI standard - but |
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it does no harm). |
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+ Reduce the ifdef's in pcre.c using macro DPRINTF, thereby eliminating |
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most of the places where whitespace preceded '#'. I have given up and |
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allowed the remaining 2 cases to be at the margin. |
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+ Rename some variables in pcre to eliminate shadowing. This seems very |
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pedantic, but does no harm, of course. |
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6. Moved the call to setjmp() into its own function, to get rid of warnings |
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from gcc -Wall, and avoided calling it at all unless PCRE_EXTRA is used. |
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7. Constructs such as \d{8,} were compiling into the equivalent of |
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\d{8}\d{0,65527} instead of \d{8}\d* which didn't make much difference to the |
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outcome, but in this particular case used more store than had been allocated, |
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which caused the bug to be discovered because it threw up an internal error. |
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8. The debugging code in both pcre and pcretest for outputting the compiled |
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form of a regex was going wrong in the case of back references followed by |
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curly-bracketed repeats. |
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Version 1.02 12-Dec-97 |
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---------------------- |
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1. Typos in pcre.3 and comments in the source fixed. |
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2. Applied a contributed patch to get rid of places where it used to remove |
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'const' from variables, and fixed some signed/unsigned and uninitialized |
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variable warnings. |
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3. Added the "runtest" target to Makefile. |
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4. Set default compiler flag to -O2 rather than just -O. |
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Version 1.01 19-Nov-97 |
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---------------------- |
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1. PCRE was failing to diagnose unlimited repeat of empty string for patterns |
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like /([ab]*)*/, that is, for classes with more than one character in them. |
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2. Likewise, it wasn't diagnosing patterns with "once-only" subpatterns, such |
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as /((?>a*))*/ (a PCRE_EXTRA facility). |
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Version 1.00 18-Nov-97 |
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---------------------- |
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1. Added compile-time macros to support systems such as SunOS4 which don't have |
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memmove() or strerror() but have other things that can be used instead. |
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2. Arranged that "make clean" removes the executables. |
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Version 0.99 27-Oct-97 |
Version 0.99 27-Oct-97 |
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---------------------- |
---------------------- |
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