| 2 |
------------------ |
------------------ |
| 3 |
|
|
| 4 |
|
|
| 5 |
|
Version 3.2 12-May-00 |
| 6 |
|
--------------------- |
| 7 |
|
|
| 8 |
|
This is purely a bug fixing release. |
| 9 |
|
|
| 10 |
|
1. If the pattern /((Z)+|A)*/ was matched agained ZABCDEFG it matched Z instead |
| 11 |
|
of ZA. This was just one example of several cases that could provoke this bug, |
| 12 |
|
which was introduced by change 9 of version 2.00. The code for breaking |
| 13 |
|
infinite loops after an iteration that matches an empty string was't working |
| 14 |
|
correctly. |
| 15 |
|
|
| 16 |
|
2. The pcretest program was not imitating Perl correctly for the pattern /a*/g |
| 17 |
|
when matched against abbab (for example). After matching an empty string, it |
| 18 |
|
wasn't forcing anchoring when setting PCRE_NOTEMPTY for the next attempt; this |
| 19 |
|
caused it to match further down the string than it should. |
| 20 |
|
|
| 21 |
|
3. The code contained an inclusion of sys/types.h. It isn't clear why this |
| 22 |
|
was there because it doesn't seem to be needed, and it causes trouble on some |
| 23 |
|
systems, as it is not a Standard C header. It has been removed. |
| 24 |
|
|
| 25 |
|
4. Made 4 silly changes to the source to avoid stupid compiler warnings that |
| 26 |
|
were reported on the Macintosh. The changes were from |
| 27 |
|
|
| 28 |
|
while ((c = *(++ptr)) != 0 && c != '\n'); |
| 29 |
|
to |
| 30 |
|
while ((c = *(++ptr)) != 0 && c != '\n') ; |
| 31 |
|
|
| 32 |
|
Totally extraordinary, but if that's what it takes... |
| 33 |
|
|
| 34 |
|
5. PCRE is being used in one environment where neither memmove() nor bcopy() is |
| 35 |
|
available. Added HAVE_BCOPY and an autoconf test for it; if neither |
| 36 |
|
HAVE_MEMMOVE nor HAVE_BCOPY is set, use a built-in emulation function which |
| 37 |
|
assumes the way PCRE uses memmove() (always moving upwards). |
| 38 |
|
|
| 39 |
|
6. PCRE is being used in one environment where strchr() is not available. There |
| 40 |
|
was only one use in pcre.c, and writing it out to avoid strchr() probably gives |
| 41 |
|
faster code anyway. |
| 42 |
|
|
| 43 |
|
|
| 44 |
|
Version 3.1 09-Feb-00 |
| 45 |
|
--------------------- |
| 46 |
|
|
| 47 |
|
The only change in this release is the fixing of some bugs in Makefile.in for |
| 48 |
|
the "install" target: |
| 49 |
|
|
| 50 |
|
(1) It was failing to install pcreposix.h. |
| 51 |
|
|
| 52 |
|
(2) It was overwriting the pcre.3 man page with the pcreposix.3 man page. |
| 53 |
|
|
| 54 |
|
|
| 55 |
|
Version 3.0 01-Feb-00 |
| 56 |
|
--------------------- |
| 57 |
|
|
| 58 |
|
1. Add support for the /+ modifier to perltest (to output $` like it does in |
| 59 |
|
pcretest). |
| 60 |
|
|
| 61 |
|
2. Add support for the /g modifier to perltest. |
| 62 |
|
|
| 63 |
|
3. Fix pcretest so that it behaves even more like Perl for /g when the pattern |
| 64 |
|
matches null strings. |
| 65 |
|
|
| 66 |
|
4. Fix perltest so that it doesn't do unwanted things when fed an empty |
| 67 |
|
pattern. Perl treats empty patterns specially - it reuses the most recent |
| 68 |
|
pattern, which is not what we want. Replace // by /(?#)/ in order to avoid this |
| 69 |
|
effect. |
| 70 |
|
|
| 71 |
|
5. The POSIX interface was broken in that it was just handing over the POSIX |
| 72 |
|
captured string vector to pcre_exec(), but (since release 2.00) PCRE has |
| 73 |
|
required a bigger vector, with some working space on the end. This means that |
| 74 |
|
the POSIX wrapper now has to get and free some memory, and copy the results. |
| 75 |
|
|
| 76 |
|
6. Added some simple autoconf support, placing the test data and the |
| 77 |
|
documentation in separate directories, re-organizing some of the |
| 78 |
|
information files, and making it build pcre-config (a GNU standard). Also added |
| 79 |
|
libtool support for building PCRE as a shared library, which is now the |
| 80 |
|
default. |
| 81 |
|
|
| 82 |
|
7. Got rid of the leading zero in the definition of PCRE_MINOR because 08 and |
| 83 |
|
09 are not valid octal constants. Single digits will be used for minor values |
| 84 |
|
less than 10. |
| 85 |
|
|
| 86 |
|
8. Defined REG_EXTENDED and REG_NOSUB as zero in the POSIX header, so that |
| 87 |
|
existing programs that set these in the POSIX interface can use PCRE without |
| 88 |
|
modification. |
| 89 |
|
|
| 90 |
|
9. Added a new function, pcre_fullinfo() with an extensible interface. It can |
| 91 |
|
return all that pcre_info() returns, plus additional data. The pcre_info() |
| 92 |
|
function is retained for compatibility, but is considered to be obsolete. |
| 93 |
|
|
| 94 |
|
10. Added experimental recursion feature (?R) to handle one common case that |
| 95 |
|
Perl 5.6 will be able to do with (?p{...}). |
| 96 |
|
|
| 97 |
|
11. Added support for POSIX character classes like [:alpha:], which Perl is |
| 98 |
|
adopting. |
| 99 |
|
|
| 100 |
|
|
| 101 |
|
Version 2.08 31-Aug-99 |
| 102 |
|
---------------------- |
| 103 |
|
|
| 104 |
|
1. When startoffset was not zero and the pattern began with ".*", PCRE was not |
| 105 |
|
trying to match at the startoffset position, but instead was moving forward to |
| 106 |
|
the next newline as if a previous match had failed. |
| 107 |
|
|
| 108 |
|
2. pcretest was not making use of PCRE_NOTEMPTY when repeating for /g and /G, |
| 109 |
|
and could get into a loop if a null string was matched other than at the start |
| 110 |
|
of the subject. |
| 111 |
|
|
| 112 |
|
3. Added definitions of PCRE_MAJOR and PCRE_MINOR to pcre.h so the version can |
| 113 |
|
be distinguished at compile time, and for completeness also added PCRE_DATE. |
| 114 |
|
|
| 115 |
|
5. Added Paul Sokolovsky's minor changes to make it easy to compile a Win32 DLL |
| 116 |
|
in GnuWin32 environments. |
| 117 |
|
|
| 118 |
|
|
| 119 |
|
Version 2.07 29-Jul-99 |
| 120 |
|
---------------------- |
| 121 |
|
|
| 122 |
|
1. The documentation is now supplied in plain text form and HTML as well as in |
| 123 |
|
the form of man page sources. |
| 124 |
|
|
| 125 |
|
2. C++ compilers don't like assigning (void *) values to other pointer types. |
| 126 |
|
In particular this affects malloc(). Although there is no problem in Standard |
| 127 |
|
C, I've put in casts to keep C++ compilers happy. |
| 128 |
|
|
| 129 |
|
3. Typo on pcretest.c; a cast of (unsigned char *) in the POSIX regexec() call |
| 130 |
|
should be (const char *). |
| 131 |
|
|
| 132 |
|
4. If NOPOSIX is defined, pcretest.c compiles without POSIX support. This may |
| 133 |
|
be useful for non-Unix systems who don't want to bother with the POSIX stuff. |
| 134 |
|
However, I haven't made this a standard facility. The documentation doesn't |
| 135 |
|
mention it, and the Makefile doesn't support it. |
| 136 |
|
|
| 137 |
|
5. The Makefile now contains an "install" target, with editable destinations at |
| 138 |
|
the top of the file. The pcretest program is not installed. |
| 139 |
|
|
| 140 |
|
6. pgrep -V now gives the PCRE version number and date. |
| 141 |
|
|
| 142 |
|
7. Fixed bug: a zero repetition after a literal string (e.g. /abcde{0}/) was |
| 143 |
|
causing the entire string to be ignored, instead of just the last character. |
| 144 |
|
|
| 145 |
|
8. If a pattern like /"([^\\"]+|\\.)*"/ is applied in the normal way to a |
| 146 |
|
non-matching string, it can take a very, very long time, even for strings of |
| 147 |
|
quite modest length, because of the nested recursion. PCRE now does better in |
| 148 |
|
some of these cases. It does this by remembering the last required literal |
| 149 |
|
character in the pattern, and pre-searching the subject to ensure it is present |
| 150 |
|
before running the real match. In other words, it applies a heuristic to detect |
| 151 |
|
some types of certain failure quickly, and in the above example, if presented |
| 152 |
|
with a string that has no trailing " it gives "no match" very quickly. |
| 153 |
|
|
| 154 |
|
9. A new runtime option PCRE_NOTEMPTY causes null string matches to be ignored; |
| 155 |
|
other alternatives are tried instead. |
| 156 |
|
|
| 157 |
|
|
| 158 |
|
Version 2.06 09-Jun-99 |
| 159 |
|
---------------------- |
| 160 |
|
|
| 161 |
|
1. Change pcretest's output for amount of store used to show just the code |
| 162 |
|
space, because the remainder (the data block) varies in size between 32-bit and |
| 163 |
|
64-bit systems. |
| 164 |
|
|
| 165 |
|
2. Added an extra argument to pcre_exec() to supply an offset in the subject to |
| 166 |
|
start matching at. This allows lookbehinds to work when searching for multiple |
| 167 |
|
occurrences in a string. |
| 168 |
|
|
| 169 |
|
3. Added additional options to pcretest for testing multiple occurrences: |
| 170 |
|
|
| 171 |
|
/+ outputs the rest of the string that follows a match |
| 172 |
|
/g loops for multiple occurrences, using the new startoffset argument |
| 173 |
|
/G loops for multiple occurrences by passing an incremented pointer |
| 174 |
|
|
| 175 |
|
4. PCRE wasn't doing the "first character" optimization for patterns starting |
| 176 |
|
with \b or \B, though it was doing it for other lookbehind assertions. That is, |
| 177 |
|
it wasn't noticing that a match for a pattern such as /\bxyz/ has to start with |
| 178 |
|
the letter 'x'. On long subject strings, this gives a significant speed-up. |
| 179 |
|
|
| 180 |
|
|
| 181 |
|
Version 2.05 21-Apr-99 |
| 182 |
|
---------------------- |
| 183 |
|
|
| 184 |
|
1. Changed the type of magic_number from int to long int so that it works |
| 185 |
|
properly on 16-bit systems. |
| 186 |
|
|
| 187 |
|
2. Fixed a bug which caused patterns starting with .* not to work correctly |
| 188 |
|
when the subject string contained newline characters. PCRE was assuming |
| 189 |
|
anchoring for such patterns in all cases, which is not correct because .* will |
| 190 |
|
not pass a newline unless PCRE_DOTALL is set. It now assumes anchoring only if |
| 191 |
|
DOTALL is set at top level; otherwise it knows that patterns starting with .* |
| 192 |
|
must be retried after every newline in the subject. |
| 193 |
|
|
| 194 |
|
|
| 195 |
|
Version 2.04 18-Feb-99 |
| 196 |
|
---------------------- |
| 197 |
|
|
| 198 |
|
1. For parenthesized subpatterns with repeats whose minimum was zero, the |
| 199 |
|
computation of the store needed to hold the pattern was incorrect (too large). |
| 200 |
|
If such patterns were nested a few deep, this could multiply and become a real |
| 201 |
|
problem. |
| 202 |
|
|
| 203 |
|
2. Added /M option to pcretest to show the memory requirement of a specific |
| 204 |
|
pattern. Made -m a synonym of -s (which does this globally) for compatibility. |
| 205 |
|
|
| 206 |
|
3. Subpatterns of the form (regex){n,m} (i.e. limited maximum) were being |
| 207 |
|
compiled in such a way that the backtracking after subsequent failure was |
| 208 |
|
pessimal. Something like (a){0,3} was compiled as (a)?(a)?(a)? instead of |
| 209 |
|
((a)((a)(a)?)?)? with disastrous performance if the maximum was of any size. |
| 210 |
|
|
| 211 |
|
|
| 212 |
|
Version 2.03 02-Feb-99 |
| 213 |
|
---------------------- |
| 214 |
|
|
| 215 |
|
1. Fixed typo and small mistake in man page. |
| 216 |
|
|
| 217 |
|
2. Added 4th condition (GPL supersedes if conflict) and created separate |
| 218 |
|
LICENCE file containing the conditions. |
| 219 |
|
|
| 220 |
|
3. Updated pcretest so that patterns such as /abc\/def/ work like they do in |
| 221 |
|
Perl, that is the internal \ allows the delimiter to be included in the |
| 222 |
|
pattern. Locked out the use of \ as a delimiter. If \ immediately follows |
| 223 |
|
the final delimiter, add \ to the end of the pattern (to test the error). |
| 224 |
|
|
| 225 |
|
4. Added the convenience functions for extracting substrings after a successful |
| 226 |
|
match. Updated pcretest to make it able to test these functions. |
| 227 |
|
|
| 228 |
|
|
| 229 |
|
Version 2.02 14-Jan-99 |
| 230 |
|
---------------------- |
| 231 |
|
|
| 232 |
|
1. Initialized the working variables associated with each extraction so that |
| 233 |
|
their saving and restoring doesn't refer to uninitialized store. |
| 234 |
|
|
| 235 |
|
2. Put dummy code into study.c in order to trick the optimizer of the IBM C |
| 236 |
|
compiler for OS/2 into generating correct code. Apparently IBM isn't going to |
| 237 |
|
fix the problem. |
| 238 |
|
|
| 239 |
|
3. Pcretest: the timing code wasn't using LOOPREPEAT for timing execution |
| 240 |
|
calls, and wasn't printing the correct value for compiling calls. Increased the |
| 241 |
|
default value of LOOPREPEAT, and the number of significant figures in the |
| 242 |
|
times. |
| 243 |
|
|
| 244 |
|
4. Changed "/bin/rm" in the Makefile to "-rm" so it works on Windows NT. |
| 245 |
|
|
| 246 |
|
5. Renamed "deftables" as "dftables" to get it down to 8 characters, to avoid |
| 247 |
|
a building problem on Windows NT with a FAT file system. |
| 248 |
|
|
| 249 |
|
|
| 250 |
|
Version 2.01 21-Oct-98 |
| 251 |
|
---------------------- |
| 252 |
|
|
| 253 |
|
1. Changed the API for pcre_compile() to allow for the provision of a pointer |
| 254 |
|
to character tables built by pcre_maketables() in the current locale. If NULL |
| 255 |
|
is passed, the default tables are used. |
| 256 |
|
|
| 257 |
|
|
| 258 |
|
Version 2.00 24-Sep-98 |
| 259 |
|
---------------------- |
| 260 |
|
|
| 261 |
|
1. Since the (>?) facility is in Perl 5.005, don't require PCRE_EXTRA to enable |
| 262 |
|
it any more. |
| 263 |
|
|
| 264 |
|
2. Allow quantification of (?>) groups, and make it work correctly. |
| 265 |
|
|
| 266 |
|
3. The first character computation wasn't working for (?>) groups. |
| 267 |
|
|
| 268 |
|
4. Correct the implementation of \Z (it is permitted to match on the \n at the |
| 269 |
|
end of the subject) and add 5.005's \z, which really does match only at the |
| 270 |
|
very end of the subject. |
| 271 |
|
|
| 272 |
|
5. Remove the \X "cut" facility; Perl doesn't have it, and (?> is neater. |
| 273 |
|
|
| 274 |
|
6. Remove the ability to specify CASELESS, MULTILINE, DOTALL, and |
| 275 |
|
DOLLAR_END_ONLY at runtime, to make it possible to implement the Perl 5.005 |
| 276 |
|
localized options. All options to pcre_study() were also removed. |
| 277 |
|
|
| 278 |
|
7. Add other new features from 5.005: |
| 279 |
|
|
| 280 |
|
$(?<= positive lookbehind |
| 281 |
|
$(?<! negative lookbehind |
| 282 |
|
(?imsx-imsx) added the unsetting capability |
| 283 |
|
such a setting is global if at outer level; local otherwise |
| 284 |
|
(?imsx-imsx:) non-capturing groups with option setting |
| 285 |
|
(?(cond)re|re) conditional pattern matching |
| 286 |
|
|
| 287 |
|
A backreference to itself in a repeated group matches the previous |
| 288 |
|
captured string. |
| 289 |
|
|
| 290 |
|
8. General tidying up of studying (both automatic and via "study") |
| 291 |
|
consequential on the addition of new assertions. |
| 292 |
|
|
| 293 |
|
9. As in 5.005, unlimited repeated groups that could match an empty substring |
| 294 |
|
are no longer faulted at compile time. Instead, the loop is forcibly broken at |
| 295 |
|
runtime if any iteration does actually match an empty substring. |
| 296 |
|
|
| 297 |
|
10. Include the RunTest script in the distribution. |
| 298 |
|
|
| 299 |
|
11. Added tests from the Perl 5.005_02 distribution. This showed up a few |
| 300 |
|
discrepancies, some of which were old and were also with respect to 5.004. They |
| 301 |
|
have now been fixed. |
| 302 |
|
|
| 303 |
|
|
| 304 |
|
Version 1.09 28-Apr-98 |
| 305 |
|
---------------------- |
| 306 |
|
|
| 307 |
|
1. A negated single character class followed by a quantifier with a minimum |
| 308 |
|
value of one (e.g. [^x]{1,6} ) was not compiled correctly. This could lead to |
| 309 |
|
program crashes, or just wrong answers. This did not apply to negated classes |
| 310 |
|
containing more than one character, or to minima other than one. |
| 311 |
|
|
| 312 |
|
|
| 313 |
|
Version 1.08 27-Mar-98 |
| 314 |
|
---------------------- |
| 315 |
|
|
| 316 |
|
1. Add PCRE_UNGREEDY to invert the greediness of quantifiers. |
| 317 |
|
|
| 318 |
|
2. Add (?U) and (?X) to set PCRE_UNGREEDY and PCRE_EXTRA respectively. The |
| 319 |
|
latter must appear before anything that relies on it in the pattern. |
| 320 |
|
|
| 321 |
|
|
| 322 |
|
Version 1.07 16-Feb-98 |
| 323 |
|
---------------------- |
| 324 |
|
|
| 325 |
|
1. A pattern such as /((a)*)*/ was not being diagnosed as in error (unlimited |
| 326 |
|
repeat of a potentially empty string). |
| 327 |
|
|
| 328 |
|
|
| 329 |
|
Version 1.06 23-Jan-98 |
| 330 |
|
---------------------- |
| 331 |
|
|
| 332 |
|
1. Added Markus Oberhumer's little patches for C++. |
| 333 |
|
|
| 334 |
|
2. Literal strings longer than 255 characters were broken. |
| 335 |
|
|
| 336 |
|
|
| 337 |
|
Version 1.05 23-Dec-97 |
| 338 |
|
---------------------- |
| 339 |
|
|
| 340 |
|
1. Negated character classes containing more than one character were failing if |
| 341 |
|
PCRE_CASELESS was set at run time. |
| 342 |
|
|
| 343 |
|
|
| 344 |
|
Version 1.04 19-Dec-97 |
| 345 |
|
---------------------- |
| 346 |
|
|
| 347 |
|
1. Corrected the man page, where some "const" qualifiers had been omitted. |
| 348 |
|
|
| 349 |
|
2. Made debugging output print "{0,xxx}" instead of just "{,xxx}" to agree with |
| 350 |
|
input syntax. |
| 351 |
|
|
| 352 |
|
3. Fixed memory leak which occurred when a regex with back references was |
| 353 |
|
matched with an offsets vector that wasn't big enough. The temporary memory |
| 354 |
|
that is used in this case wasn't being freed if the match failed. |
| 355 |
|
|
| 356 |
|
4. Tidied pcretest to ensure it frees memory that it gets. |
| 357 |
|
|
| 358 |
|
5. Temporary memory was being obtained in the case where the passed offsets |
| 359 |
|
vector was exactly big enough. |
| 360 |
|
|
| 361 |
|
6. Corrected definition of offsetof() from change 5 below. |
| 362 |
|
|
| 363 |
|
7. I had screwed up change 6 below and broken the rules for the use of |
| 364 |
|
setjmp(). Now fixed. |
| 365 |
|
|
| 366 |
|
|
| 367 |
|
Version 1.03 18-Dec-97 |
| 368 |
|
---------------------- |
| 369 |
|
|
| 370 |
|
1. A erroneous regex with a missing opening parenthesis was correctly |
| 371 |
|
diagnosed, but PCRE attempted to access brastack[-1], which could cause crashes |
| 372 |
|
on some systems. |
| 373 |
|
|
| 374 |
|
2. Replaced offsetof(real_pcre, code) by offsetof(real_pcre, code[0]) because |
| 375 |
|
it was reported that one broken compiler failed on the former because "code" is |
| 376 |
|
also an independent variable. |
| 377 |
|
|
| 378 |
|
3. The erroneous regex a[]b caused an array overrun reference. |
| 379 |
|
|
| 380 |
|
4. A regex ending with a one-character negative class (e.g. /[^k]$/) did not |
| 381 |
|
fail on data ending with that character. (It was going on too far, and checking |
| 382 |
|
the next character, typically a binary zero.) This was specific to the |
| 383 |
|
optimized code for single-character negative classes. |
| 384 |
|
|
| 385 |
|
5. Added a contributed patch from the TIN world which does the following: |
| 386 |
|
|
| 387 |
|
+ Add an undef for memmove, in case the the system defines a macro for it. |
| 388 |
|
|
| 389 |
|
+ Add a definition of offsetof(), in case there isn't one. (I don't know |
| 390 |
|
the reason behind this - offsetof() is part of the ANSI standard - but |
| 391 |
|
it does no harm). |
| 392 |
|
|
| 393 |
|
+ Reduce the ifdef's in pcre.c using macro DPRINTF, thereby eliminating |
| 394 |
|
most of the places where whitespace preceded '#'. I have given up and |
| 395 |
|
allowed the remaining 2 cases to be at the margin. |
| 396 |
|
|
| 397 |
|
+ Rename some variables in pcre to eliminate shadowing. This seems very |
| 398 |
|
pedantic, but does no harm, of course. |
| 399 |
|
|
| 400 |
|
6. Moved the call to setjmp() into its own function, to get rid of warnings |
| 401 |
|
from gcc -Wall, and avoided calling it at all unless PCRE_EXTRA is used. |
| 402 |
|
|
| 403 |
|
7. Constructs such as \d{8,} were compiling into the equivalent of |
| 404 |
|
\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. |
| 407 |
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|
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8. The debugging code in both pcre and pcretest for outputting the compiled |
| 409 |
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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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|
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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 |
Version 1.01 19-Nov-97 |
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---------------------- |
---------------------- |
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| 
Revision Log
| 
Patch