Tristan Matthews | 0461646 | 2013-11-14 16:09:34 -0500 | [diff] [blame] | 1 | News about PCRE releases |
| 2 | ------------------------ |
| 3 | |
| 4 | Release 8.21 12-Dec-2011 |
| 5 | ------------------------ |
| 6 | |
| 7 | This is almost entirely a bug-fix release. The only new feature is the ability |
| 8 | to obtain the size of the memory used by the JIT compiler. |
| 9 | |
| 10 | |
| 11 | Release 8.20 21-Oct-2011 |
| 12 | ------------------------ |
| 13 | |
| 14 | The main change in this release is the inclusion of Zoltan Herczeg's |
| 15 | just-in-time compiler support, which can be accessed by building PCRE with |
| 16 | --enable-jit. Large performance benefits can be had in many situations. 8.20 |
| 17 | also fixes an unfortunate bug that was introduced in 8.13 as well as tidying up |
| 18 | a number of infelicities and differences from Perl. |
| 19 | |
| 20 | |
| 21 | Release 8.13 16-Aug-2011 |
| 22 | ------------------------ |
| 23 | |
| 24 | This is mainly a bug-fix release. There has been a lot of internal refactoring. |
| 25 | The Unicode tables have been updated. The only new feature in the library is |
| 26 | the passing of *MARK information to callouts. Some additions have been made to |
| 27 | pcretest to make testing easier and more comprehensive. There is a new option |
| 28 | for pcregrep to adjust its internal buffer size. |
| 29 | |
| 30 | |
| 31 | Release 8.12 15-Jan-2011 |
| 32 | ------------------------ |
| 33 | |
| 34 | This release fixes some bugs in pcregrep, one of which caused the tests to fail |
| 35 | on 64-bit big-endian systems. There are no changes to the code of the library. |
| 36 | |
| 37 | |
| 38 | Release 8.11 10-Dec-2010 |
| 39 | ------------------------ |
| 40 | |
| 41 | A number of bugs in the library and in pcregrep have been fixed. As always, see |
| 42 | ChangeLog for details. The following are the non-bug-fix changes: |
| 43 | |
| 44 | . Added --match-limit and --recursion-limit to pcregrep. |
| 45 | |
| 46 | . Added an optional parentheses number to the -o and --only-matching options |
| 47 | of pcregrep. |
| 48 | |
| 49 | . Changed the way PCRE_PARTIAL_HARD affects the matching of $, \z, \Z, \b, and |
| 50 | \B. |
| 51 | |
| 52 | . Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a |
| 53 | bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD. |
| 54 | |
| 55 | . Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_ |
| 56 | START_OPTIMIZE option, which is now allowed at compile time |
| 57 | |
| 58 | |
| 59 | Release 8.10 25-Jun-2010 |
| 60 | ------------------------ |
| 61 | |
| 62 | There are two major additions: support for (*MARK) and friends, and the option |
| 63 | PCRE_UCP, which changes the behaviour of \b, \d, \s, and \w (and their |
| 64 | opposites) so that they make use of Unicode properties. There are also a number |
| 65 | of lesser new features, and several bugs have been fixed. A new option, |
| 66 | --line-buffered, has been added to pcregrep, for use when it is connected to |
| 67 | pipes. |
| 68 | |
| 69 | |
| 70 | Release 8.02 19-Mar-2010 |
| 71 | ------------------------ |
| 72 | |
| 73 | Another bug-fix release. |
| 74 | |
| 75 | |
| 76 | Release 8.01 19-Jan-2010 |
| 77 | ------------------------ |
| 78 | |
| 79 | This is a bug-fix release. Several bugs in the code itself and some bugs and |
| 80 | infelicities in the build system have been fixed. |
| 81 | |
| 82 | |
| 83 | Release 8.00 19-Oct-09 |
| 84 | ---------------------- |
| 85 | |
| 86 | Bugs have been fixed in the library and in pcregrep. There are also some |
| 87 | enhancements. Restrictions on patterns used for partial matching have been |
| 88 | removed, extra information is given for partial matches, the partial matching |
| 89 | process has been improved, and an option to make a partial match override a |
| 90 | full match is available. The "study" process has been enhanced by finding a |
| 91 | lower bound matching length. Groups with duplicate numbers may now have |
| 92 | duplicated names without the use of PCRE_DUPNAMES. However, they may not have |
| 93 | different names. The documentation has been revised to reflect these changes. |
| 94 | The version number has been expanded to 3 digits as it is clear that the rate |
| 95 | of change is not slowing down. |
| 96 | |
| 97 | |
| 98 | Release 7.9 11-Apr-09 |
| 99 | --------------------- |
| 100 | |
| 101 | Mostly bugfixes and tidies with just a couple of minor functional additions. |
| 102 | |
| 103 | |
| 104 | Release 7.8 05-Sep-08 |
| 105 | --------------------- |
| 106 | |
| 107 | More bug fixes, plus a performance improvement in Unicode character property |
| 108 | lookup. |
| 109 | |
| 110 | |
| 111 | Release 7.7 07-May-08 |
| 112 | --------------------- |
| 113 | |
| 114 | This is once again mainly a bug-fix release, but there are a couple of new |
| 115 | features. |
| 116 | |
| 117 | |
| 118 | Release 7.6 28-Jan-08 |
| 119 | --------------------- |
| 120 | |
| 121 | The main reason for having this release so soon after 7.5 is because it fixes a |
| 122 | potential buffer overflow problem in pcre_compile() when run in UTF-8 mode. In |
| 123 | addition, the CMake configuration files have been brought up to date. |
| 124 | |
| 125 | |
| 126 | Release 7.5 10-Jan-08 |
| 127 | --------------------- |
| 128 | |
| 129 | This is mainly a bug-fix release. However the ability to link pcregrep with |
| 130 | libz or libbz2 and the ability to link pcretest with libreadline have been |
| 131 | added. Also the --line-offsets and --file-offsets options were added to |
| 132 | pcregrep. |
| 133 | |
| 134 | |
| 135 | Release 7.4 21-Sep-07 |
| 136 | --------------------- |
| 137 | |
| 138 | The only change of specification is the addition of options to control whether |
| 139 | \R matches any Unicode line ending (the default) or just CR, LF, and CRLF. |
| 140 | Otherwise, the changes are bug fixes and a refactoring to reduce the number of |
| 141 | relocations needed in a shared library. There have also been some documentation |
| 142 | updates, in particular, some more information about using CMake to build PCRE |
| 143 | has been added to the NON-UNIX-USE file. |
| 144 | |
| 145 | |
| 146 | Release 7.3 28-Aug-07 |
| 147 | --------------------- |
| 148 | |
| 149 | Most changes are bug fixes. Some that are not: |
| 150 | |
| 151 | 1. There is some support for Perl 5.10's experimental "backtracking control |
| 152 | verbs" such as (*PRUNE). |
| 153 | |
| 154 | 2. UTF-8 checking is now as per RFC 3629 instead of RFC 2279; this is more |
| 155 | restrictive in the strings it accepts. |
| 156 | |
| 157 | 3. Checking for potential integer overflow has been made more dynamic, and as a |
| 158 | consequence there is no longer a hard limit on the size of a subpattern that |
| 159 | has a limited repeat count. |
| 160 | |
| 161 | 4. When CRLF is a valid line-ending sequence, pcre_exec() and pcre_dfa_exec() |
| 162 | no longer advance by two characters instead of one when an unanchored match |
| 163 | fails at CRLF if there are explicit CR or LF matches within the pattern. |
| 164 | This gets rid of some anomalous effects that previously occurred. |
| 165 | |
| 166 | 5. Some PCRE-specific settings for varying the newline options at the start of |
| 167 | a pattern have been added. |
| 168 | |
| 169 | |
| 170 | Release 7.2 19-Jun-07 |
| 171 | --------------------- |
| 172 | |
| 173 | WARNING: saved patterns that were compiled by earlier versions of PCRE must be |
| 174 | recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v, |
| 175 | and \V). |
| 176 | |
| 177 | Correction to the notes for 7.1: the note about shared libraries for Windows is |
| 178 | wrong. Previously, three libraries were built, but each could function |
| 179 | independently. For example, the pcreposix library also included all the |
| 180 | functions from the basic pcre library. The change is that the three libraries |
| 181 | are no longer independent. They are like the Unix libraries. To use the |
| 182 | pcreposix functions, for example, you need to link with both the pcreposix and |
| 183 | the basic pcre library. |
| 184 | |
| 185 | Some more features from Perl 5.10 have been added: |
| 186 | |
| 187 | (?-n) and (?+n) relative references for recursion and subroutines. |
| 188 | |
| 189 | (?(-n) and (?(+n) relative references as conditions. |
| 190 | |
| 191 | \k{name} and \g{name} are synonyms for \k<name>. |
| 192 | |
| 193 | \K to reset the start of the matched string; for example, (foo)\Kbar |
| 194 | matches bar preceded by foo, but only sets bar as the matched string. |
| 195 | |
| 196 | (?| introduces a group where the capturing parentheses in each alternative |
| 197 | start from the same number; for example, (?|(abc)|(xyz)) sets capturing |
| 198 | parentheses number 1 in both cases. |
| 199 | |
| 200 | \h, \H, \v, \V match horizontal and vertical whitespace, respectively. |
| 201 | |
| 202 | |
| 203 | Release 7.1 24-Apr-07 |
| 204 | --------------------- |
| 205 | |
| 206 | There is only one new feature in this release: a linebreak setting of |
| 207 | PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which |
| 208 | recognizes only CRLF, CR, and LF as linebreaks. |
| 209 | |
| 210 | A few bugs are fixed (see ChangeLog for details), but the major change is a |
| 211 | complete re-implementation of the build system. This now has full Autotools |
| 212 | support and so is now "standard" in some sense. It should help with compiling |
| 213 | PCRE in a wide variety of environments. |
| 214 | |
| 215 | NOTE: when building shared libraries for Windows, three dlls are now built, |
| 216 | called libpcre, libpcreposix, and libpcrecpp. Previously, everything was |
| 217 | included in a single dll. |
| 218 | |
| 219 | Another important change is that the dftables auxiliary program is no longer |
| 220 | compiled and run at "make" time by default. Instead, a default set of character |
| 221 | tables (assuming ASCII coding) is used. If you want to use dftables to generate |
| 222 | the character tables as previously, add --enable-rebuild-chartables to the |
| 223 | "configure" command. You must do this if you are compiling PCRE to run on a |
| 224 | system that uses EBCDIC code. |
| 225 | |
| 226 | There is a discussion about character tables in the README file. The default is |
| 227 | not to use dftables so that that there is no problem when cross-compiling. |
| 228 | |
| 229 | |
| 230 | Release 7.0 19-Dec-06 |
| 231 | --------------------- |
| 232 | |
| 233 | This release has a new major number because there have been some internal |
| 234 | upheavals to facilitate the addition of new optimizations and other facilities, |
| 235 | and to make subsequent maintenance and extension easier. Compilation is likely |
| 236 | to be a bit slower, but there should be no major effect on runtime performance. |
| 237 | Previously compiled patterns are NOT upwards compatible with this release. If |
| 238 | you have saved compiled patterns from a previous release, you will have to |
| 239 | re-compile them. Important changes that are visible to users are: |
| 240 | |
| 241 | 1. The Unicode property tables have been updated to Unicode 5.0.0, which adds |
| 242 | some more scripts. |
| 243 | |
| 244 | 2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline |
| 245 | sequence as a newline. |
| 246 | |
| 247 | 3. The \R escape matches a single Unicode newline sequence as a single unit. |
| 248 | |
| 249 | 4. New features that will appear in Perl 5.10 are now in PCRE. These include |
| 250 | alternative Perl syntax for named parentheses, and Perl syntax for |
| 251 | recursion. |
| 252 | |
| 253 | 5. The C++ wrapper interface has been extended by the addition of a |
| 254 | QuoteMeta function and the ability to allow copy construction and |
| 255 | assignment. |
| 256 | |
| 257 | For a complete list of changes, see the ChangeLog file. |
| 258 | |
| 259 | |
| 260 | Release 6.7 04-Jul-06 |
| 261 | --------------------- |
| 262 | |
| 263 | The main additions to this release are the ability to use the same name for |
| 264 | multiple sets of parentheses, and support for CRLF line endings in both the |
| 265 | library and pcregrep (and in pcretest for testing). |
| 266 | |
| 267 | Thanks to Ian Taylor, the stack usage for many kinds of pattern has been |
| 268 | significantly reduced for certain subject strings. |
| 269 | |
| 270 | |
| 271 | Release 6.5 01-Feb-06 |
| 272 | --------------------- |
| 273 | |
| 274 | Important changes in this release: |
| 275 | |
| 276 | 1. A number of new features have been added to pcregrep. |
| 277 | |
| 278 | 2. The Unicode property tables have been updated to Unicode 4.1.0, and the |
| 279 | supported properties have been extended with script names such as "Arabic", |
| 280 | and the derived properties "Any" and "L&". This has necessitated a change to |
| 281 | the interal format of compiled patterns. Any saved compiled patterns that |
| 282 | use \p or \P must be recompiled. |
| 283 | |
| 284 | 3. The specification of recursion in patterns has been changed so that all |
| 285 | recursive subpatterns are automatically treated as atomic groups. Thus, for |
| 286 | example, (?R) is treated as if it were (?>(?R)). This is necessary because |
| 287 | otherwise there are situations where recursion does not work. |
| 288 | |
| 289 | See the ChangeLog for a complete list of changes, which include a number of bug |
| 290 | fixes and tidies. |
| 291 | |
| 292 | |
| 293 | Release 6.0 07-Jun-05 |
| 294 | --------------------- |
| 295 | |
| 296 | The release number has been increased to 6.0 because of the addition of several |
| 297 | major new pieces of functionality. |
| 298 | |
| 299 | A new function, pcre_dfa_exec(), which implements pattern matching using a DFA |
| 300 | algorithm, has been added. This has a number of advantages for certain cases, |
| 301 | though it does run more slowly, and lacks the ability to capture substrings. On |
| 302 | the other hand, it does find all matches, not just the first, and it works |
| 303 | better for partial matching. The pcrematching man page discusses the |
| 304 | differences. |
| 305 | |
| 306 | The pcretest program has been enhanced so that it can make use of the new |
| 307 | pcre_dfa_exec() matching function and the extra features it provides. |
| 308 | |
| 309 | The distribution now includes a C++ wrapper library. This is built |
| 310 | automatically if a C++ compiler is found. The pcrecpp man page discusses this |
| 311 | interface. |
| 312 | |
| 313 | The code itself has been re-organized into many more files, one for each |
| 314 | function, so it no longer requires everything to be linked in when static |
| 315 | linkage is used. As a consequence, some internal functions have had to have |
| 316 | their names exposed. These functions all have names starting with _pcre_. They |
| 317 | are undocumented, and are not intended for use by outside callers. |
| 318 | |
| 319 | The pcregrep program has been enhanced with new functionality such as |
| 320 | multiline-matching and options for output more matching context. See the |
| 321 | ChangeLog for a complete list of changes to the library and the utility |
| 322 | programs. |
| 323 | |
| 324 | |
| 325 | Release 5.0 13-Sep-04 |
| 326 | --------------------- |
| 327 | |
| 328 | The licence under which PCRE is released has been changed to the more |
| 329 | conventional "BSD" licence. |
| 330 | |
| 331 | In the code, some bugs have been fixed, and there are also some major changes |
| 332 | in this release (which is why I've increased the number to 5.0). Some changes |
| 333 | are internal rearrangements, and some provide a number of new facilities. The |
| 334 | new features are: |
| 335 | |
| 336 | 1. There's an "automatic callout" feature that inserts callouts before every |
| 337 | item in the regex, and there's a new callout field that gives the position |
| 338 | in the pattern - useful for debugging and tracing. |
| 339 | |
| 340 | 2. The extra_data structure can now be used to pass in a set of character |
| 341 | tables at exec time. This is useful if compiled regex are saved and re-used |
| 342 | at a later time when the tables may not be at the same address. If the |
| 343 | default internal tables are used, the pointer saved with the compiled |
| 344 | pattern is now set to NULL, which means that you don't need to do anything |
| 345 | special unless you are using custom tables. |
| 346 | |
| 347 | 3. It is possible, with some restrictions on the content of the regex, to |
| 348 | request "partial" matching. A special return code is given if all of the |
| 349 | subject string matched part of the regex. This could be useful for testing |
| 350 | an input field as it is being typed. |
| 351 | |
| 352 | 4. There is now some optional support for Unicode character properties, which |
| 353 | means that the patterns items such as \p{Lu} and \X can now be used. Only |
| 354 | the general category properties are supported. If PCRE is compiled with this |
| 355 | support, an additional 90K data structure is include, which increases the |
| 356 | size of the library dramatically. |
| 357 | |
| 358 | 5. There is support for saving compiled patterns and re-using them later. |
| 359 | |
| 360 | 6. There is support for running regular expressions that were compiled on a |
| 361 | different host with the opposite endianness. |
| 362 | |
| 363 | 7. The pcretest program has been extended to accommodate the new features. |
| 364 | |
| 365 | The main internal rearrangement is that sequences of literal characters are no |
| 366 | longer handled as strings. Instead, each character is handled on its own. This |
| 367 | makes some UTF-8 handling easier, and makes the support of partial matching |
| 368 | possible. Compiled patterns containing long literal strings will be larger as a |
| 369 | result of this change; I hope that performance will not be much affected. |
| 370 | |
| 371 | |
| 372 | Release 4.5 01-Dec-03 |
| 373 | --------------------- |
| 374 | |
| 375 | Again mainly a bug-fix and tidying release, with only a couple of new features: |
| 376 | |
| 377 | 1. It's possible now to compile PCRE so that it does not use recursive |
| 378 | function calls when matching. Instead it gets memory from the heap. This slows |
| 379 | things down, but may be necessary on systems with limited stacks. |
| 380 | |
| 381 | 2. UTF-8 string checking has been tightened to reject overlong sequences and to |
| 382 | check that a starting offset points to the start of a character. Failure of the |
| 383 | latter returns a new error code: PCRE_ERROR_BADUTF8_OFFSET. |
| 384 | |
| 385 | 3. PCRE can now be compiled for systems that use EBCDIC code. |
| 386 | |
| 387 | |
| 388 | Release 4.4 21-Aug-03 |
| 389 | --------------------- |
| 390 | |
| 391 | This is mainly a bug-fix and tidying release. The only new feature is that PCRE |
| 392 | checks UTF-8 strings for validity by default. There is an option to suppress |
| 393 | this, just in case anybody wants that teeny extra bit of performance. |
| 394 | |
| 395 | |
| 396 | Releases 4.1 - 4.3 |
| 397 | ------------------ |
| 398 | |
| 399 | Sorry, I forgot about updating the NEWS file for these releases. Please take a |
| 400 | look at ChangeLog. |
| 401 | |
| 402 | |
| 403 | Release 4.0 17-Feb-03 |
| 404 | --------------------- |
| 405 | |
| 406 | There have been a lot of changes for the 4.0 release, adding additional |
| 407 | functionality and mending bugs. Below is a list of the highlights of the new |
| 408 | functionality. For full details of these features, please consult the |
| 409 | documentation. For a complete list of changes, see the ChangeLog file. |
| 410 | |
| 411 | 1. Support for Perl's \Q...\E escapes. |
| 412 | |
| 413 | 2. "Possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's Java |
| 414 | package. They provide some syntactic sugar for simple cases of "atomic |
| 415 | grouping". |
| 416 | |
| 417 | 3. Support for the \G assertion. It is true when the current matching position |
| 418 | is at the start point of the match. |
| 419 | |
| 420 | 4. A new feature that provides some of the functionality that Perl provides |
| 421 | with (?{...}). The facility is termed a "callout". The way it is done in PCRE |
| 422 | is for the caller to provide an optional function, by setting pcre_callout to |
| 423 | its entry point. To get the function called, the regex must include (?C) at |
| 424 | appropriate points. |
| 425 | |
| 426 | 5. Support for recursive calls to individual subpatterns. This makes it really |
| 427 | easy to get totally confused. |
| 428 | |
| 429 | 6. Support for named subpatterns. The Python syntax (?P<name>...) is used to |
| 430 | name a group. |
| 431 | |
| 432 | 7. Several extensions to UTF-8 support; it is now fairly complete. There is an |
| 433 | option for pcregrep to make it operate in UTF-8 mode. |
| 434 | |
| 435 | 8. The single man page has been split into a number of separate man pages. |
| 436 | These also give rise to individual HTML pages which are put in a separate |
| 437 | directory. There is an index.html page that lists them all. Some hyperlinking |
| 438 | between the pages has been installed. |
| 439 | |
| 440 | |
| 441 | Release 3.5 15-Aug-01 |
| 442 | --------------------- |
| 443 | |
| 444 | 1. The configuring system has been upgraded to use later versions of autoconf |
| 445 | and libtool. By default it builds both a shared and a static library if the OS |
| 446 | supports it. You can use --disable-shared or --disable-static on the configure |
| 447 | command if you want only one of them. |
| 448 | |
| 449 | 2. The pcretest utility is now installed along with pcregrep because it is |
| 450 | useful for users (to test regexs) and by doing this, it automatically gets |
| 451 | relinked by libtool. The documentation has been turned into a man page, so |
| 452 | there are now .1, .txt, and .html versions in /doc. |
| 453 | |
| 454 | 3. Upgrades to pcregrep: |
| 455 | (i) Added long-form option names like gnu grep. |
| 456 | (ii) Added --help to list all options with an explanatory phrase. |
| 457 | (iii) Added -r, --recursive to recurse into sub-directories. |
| 458 | (iv) Added -f, --file to read patterns from a file. |
| 459 | |
| 460 | 4. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure |
| 461 | script, to force use of CR or LF instead of \n in the source. On non-Unix |
| 462 | systems, the value can be set in config.h. |
| 463 | |
| 464 | 5. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an |
| 465 | absolute limit. Changed the text of the error message to make this clear, and |
| 466 | likewise updated the man page. |
| 467 | |
| 468 | 6. The limit of 99 on the number of capturing subpatterns has been removed. |
| 469 | The new limit is 65535, which I hope will not be a "real" limit. |
| 470 | |
| 471 | |
| 472 | Release 3.3 01-Aug-00 |
| 473 | --------------------- |
| 474 | |
| 475 | There is some support for UTF-8 character strings. This is incomplete and |
| 476 | experimental. The documentation describes what is and what is not implemented. |
| 477 | Otherwise, this is just a bug-fixing release. |
| 478 | |
| 479 | |
| 480 | Release 3.0 01-Feb-00 |
| 481 | --------------------- |
| 482 | |
| 483 | 1. A "configure" script is now used to configure PCRE for Unix systems. It |
| 484 | builds a Makefile, a config.h file, and the pcre-config script. |
| 485 | |
| 486 | 2. PCRE is built as a shared library by default. |
| 487 | |
| 488 | 3. There is support for POSIX classes such as [:alpha:]. |
| 489 | |
| 490 | 5. There is an experimental recursion feature. |
| 491 | |
| 492 | ---------------------------------------------------------------------------- |
| 493 | IMPORTANT FOR THOSE UPGRADING FROM VERSIONS BEFORE 2.00 |
| 494 | |
| 495 | Please note that there has been a change in the API such that a larger |
| 496 | ovector is required at matching time, to provide some additional workspace. |
| 497 | The new man page has details. This change was necessary in order to support |
| 498 | some of the new functionality in Perl 5.005. |
| 499 | |
| 500 | IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.00 |
| 501 | |
| 502 | Another (I hope this is the last!) change has been made to the API for the |
| 503 | pcre_compile() function. An additional argument has been added to make it |
| 504 | possible to pass over a pointer to character tables built in the current |
| 505 | locale by pcre_maketables(). To use the default tables, this new arguement |
| 506 | should be passed as NULL. |
| 507 | |
| 508 | IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.05 |
| 509 | |
| 510 | Yet another (and again I hope this really is the last) change has been made |
| 511 | to the API for the pcre_exec() function. An additional argument has been |
| 512 | added to make it possible to start the match other than at the start of the |
| 513 | subject string. This is important if there are lookbehinds. The new man |
| 514 | page has the details, but you just want to convert existing programs, all |
| 515 | you need to do is to stick in a new fifth argument to pcre_exec(), with a |
| 516 | value of zero. For example, change |
| 517 | |
| 518 | pcre_exec(pattern, extra, subject, length, options, ovec, ovecsize) |
| 519 | to |
| 520 | pcre_exec(pattern, extra, subject, length, 0, options, ovec, ovecsize) |
| 521 | |
| 522 | **** |