Bug #51663 [Bgs]: PHP preg_match doesn't match string which should match

Edit report at http://bugs.php.net/bug.php?id=51663&edit=1 ID: 51663 User updated by: jordi dot salvat dot i dot alabart at gmail dot com Reported by: jordi dot salvat dot i dot alabart at gmail dot com Summary: PHP preg_match doesn't match string which should match Status: Bogus Type: Bug Package: PCRE related Operating System: Ubuntu PHP Version: 5.3.2 New Comment: Thanks a lot for diagnosing this one. Clearly I should avoid excessive backtracking by using the likes of /([^:]+)+:/ instead of /(.+)+/. I've filed a report for the incorrect return value in http://bugs.php.net/bug.php?id=51741 Previous Comments: ------------------------------------------------------------------------ [2010-04-30 00:03:36] felipe@php.net Thank you for taking the time to write to us, but this is not a bug. Please double-check the documentation available at http://www.php.net/manual/ and the instructions on how to report a bug at http://bugs.php.net/how-to-report.php Change the pcre.backtrack_limit directive value. [1] Tested on 5.3SVN: <?php printf("pcre.backtrack_limit = %d\n", ini_get('pcre.backtrack_limit')); var_dump(preg_match("/(.+)+:/", "a:bbbbbbbbbbbbb")); // 0 var_dump(preg_last_error()); // 2 (i.e. PREG_BACKTRACK_LIMIT_ERROR) ini_set('pcre.backtrack_limit', 1000000); printf("pcre.backtrack_limit = %d\n", ini_get('pcre.backtrack_limit')); var_dump(preg_match("/(.+)+:/", "a:bbbbbbbbbbbbb")); // 1 var_dump(preg_last_error()); // 0 [1] http://docs.php.net/manual/en/pcre.configuration.php ------------------------------------------------------------------------ [2010-04-28 17:48:13] jordi dot salvat dot i dot alabart at gmail dot com No, I didn't try it myself. A colleague (Diego Campoy) with more time available downloaded, compiled, and tested my first steps-to-reproduce in 5.3.2, thus confirming the bug. Diego confirms that he tested with the bundled PCRE library, version 7.8. ------------------------------------------------------------------------ [2010-04-28 11:45:56] pajoye@php.net Only to be sure: did you actually try using 5.3.2 and the bundled PCRE? You can test it without having to install PHP on your system. You only have to compile php. The same applies for php 5.2.13. ------------------------------------------------------------------------ [2010-04-28 11:31:07] adconrad at ubuntu dot com Given that Ubuntu builds PHP against the system libpcre, and pcretest (by definition, but also a quick visual check with ldd) also uses the system libpcre, it seems unlikely this is a problem with libpcre itself, since pcretest works and PHP doesn't. ------------------------------------------------------------------------ [2010-04-26 12:18:53] johannes@php.net Are you using the bundled PCRE lib or your system's one? - Default is the bundled one. currently bundled is 8.02. i assume this is a PCRE and no PHP issue. ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at http://bugs.php.net/bug.php?id=51663 -- Edit this bug report at http://bugs.php.net/bug.php?id=51663&edit=1