#38600 [NEW]: Infinite loop in preg_match

From: phillip dot berndt at googlemail dot com Operating system: Linux PHP version: 5.1.5 PHP Bug Type: PCRE related Bug description: Infinite loop in preg_match Description: ------------ When executing the code below, the function won't return but loop forever (or do something else, I don't know). Reproduce code: --------------- <?php $foo = 'bla bla bla'; preg_match('/(?<!\w)(0x[\p{N}]+[lL]?|[\p{Nd}]+(e[\p{Nd}]*)?[lLdDfF]?)(?!\w)/', $foo); ?> Expected result: ---------------- Something like that: pberndt@locutus ~ $ time perl -e '$_="bla bla bla"; /(?<!\w)(0x[\p{N}]+[lL]?|[\p{Nd}]+(e[\p{Nd}]*)?[lLdDfF]?)(?!\w)/;' real 0m0.017s user 0m0.016s sys 0m0.000s Actual result: -------------- pberndt@locutus ~ $ php <?php set_time_limit(10); $foo = 'bla bla bla'; preg_match('/(?<!\w)(0x[\p{N}]+[lL]?|[\p{Nd}]+(e[\p{Nd}]*)?[lLdDfF]?)(?!\w)/', $foo); ?> Fatal error: Maximum execution time of 10 seconds exceeded in /home/pberndt/- on line 4 -- Edit bug report at http://bugs.php.net/?id=38600&edit=1 -- Try a CVS snapshot (PHP 4.4): http://bugs.php.net/fix.php?id=38600&r=trysnapshot44 Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=38600&r=trysnapshot52 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=38600&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=38600&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=38600&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=38600&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=38600&r=needscript Try newer version: http://bugs.php.net/fix.php?id=38600&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=38600&r=support Expected behavior: http://bugs.php.net/fix.php?id=38600&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=38600&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=38600&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=38600&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=38600&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=38600&r=dst IIS Stability: http://bugs.php.net/fix.php?id=38600&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=38600&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=38600&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=38600&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=38600&r=mysqlcfg