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ChangeLog for PCRE |
ChangeLog for PCRE |
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Version 2.04 18-Feb-99 |
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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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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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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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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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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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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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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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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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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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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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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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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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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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