#33468 [NEW]: preg_match on long strings fails

From: mjsherman at chartermi dot net Operating system: Linux PHP version: 4.3.11 PHP Bug Type: PCRE related Bug description: preg_match on long strings fails Description: ------------ preg_match, if passed a long subject string, fails unexpectedly. I have read through the PCRE limitations, and can't see that this is one of them. I have tried increasing memory limit (to increase the stack) with the same results. Cutoff and examples are below: Reproduce code: --------------- $subject = str_repeat('a',100); $subject .= str_repeat('b', 4370); $subject .= str_repeat('a', 100); if (preg_match('/(.*).*?\1/',$subject)) { echo "OK\n"; } Expected result: ---------------- "OK" to be printed after matching 100 "a"s. If 4370 is changed to 4369, then "OK" is printed. Actual result: -------------- With 4370 'b's, nothing is printed (failed preg_match) With 4369 'b's, "OK" is printed (worked). -- Edit bug report at http://bugs.php.net/?id=33468&edit=1 -- Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=33468&r=trysnapshot4 Try a CVS snapshot (php5.0): http://bugs.php.net/fix.php?id=33468&r=trysnapshot50 Try a CVS snapshot (php5.1): http://bugs.php.net/fix.php?id=33468&r=trysnapshot51 Fixed in CVS: http://bugs.php.net/fix.php?id=33468&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=33468&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=33468&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=33468&r=needscript Try newer version: http://bugs.php.net/fix.php?id=33468&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=33468&r=support Expected behavior: http://bugs.php.net/fix.php?id=33468&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=33468&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=33468&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=33468&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=33468&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=33468&r=dst IIS Stability: http://bugs.php.net/fix.php?id=33468&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=33468&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=33468&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=33468&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=33468&r=mysqlcfg