Bug #66423 [NEW]: preg_match / preg_replace greedyness changes unpredictably with subject string

From: publi at web dot de Operating system: Debian Linux PHP version: Irrelevant Package: *Regular Expressions Bug Type: Bug Bug description:preg_match / preg_replace greedyness changes unpredictably with subject string Description: ------------ I am using a shared debian host where I cannot easily upgrade to a newer version of PHP myself, currently it is PHP Version 5.3.3-7+squeeze18 I currently experience the expected behavior at roughly 85% of the inputs: the preg_* modifiers "sU" make two ".*"s in the search string ungreedy. Otherwise, at least the 1st occurrence of ".*" is not greedy. Alterig it to ".*?" fixes the problem. Behavior reproducibly depended on the subject strings of the search in my tests. Since these are lengthy web pages, there is an archive with all source files at: http://omegawiki.purodha.net/test-M15/test-M15.tgz and the test script is also available to run at: http://omegawiki.purodha.net/test-M15/test-M15.php and more input files for additional tests ate at: http://omegawiki.purodha.net/test-M15/ If you want more information or additional tests, feel free to contact me via e-mail. Test script: --------------- See: http://omegawiki.purodha.net/test-M15/test-M15.tgz http://omegawiki.purodha.net/test-M15/test-M15.php Expected result: ---------------- file regex-1 regex-2 6028 1 1 6245 1 1 Actual result: -------------- file regex-1 regex-2 6028 1 1 6245 0 1 -- Edit bug report at https://bugs.php.net/bug.php?id=66423&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=66423&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=66423&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=66423&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=66423&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=66423&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=66423&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=66423&r=needscript Try newer version: https://bugs.php.net/fix.php?id=66423&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=66423&r=support Expected behavior: https://bugs.php.net/fix.php?id=66423&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=66423&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=66423&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=66423&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=66423&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=66423&r=dst IIS Stability: https://bugs.php.net/fix.php?id=66423&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=66423&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=66423&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=66423&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=66423&r=mysqlcfg