Bug #67235 [NEW]: Possessive quantifier problem with preg_match()

From: david dot a dot schmitt at verizon dot com Operating system: Linux (Fedora 20) PHP version: 5.5.12 Package: PCRE related Bug Type: Bug Bug description:Possessive quantifier problem with preg_match() Description: ------------ 1. preg_match() behaviour does not match pcregrep behaviour for some patterns involving possessive quantifiers. 2. preg_match() behaviour also appears internally inconsistent when switching from greedy to possessive quantifiers in those cases (+ to ++). Below is my environment (Fedora 20): $ php -V PHP 5.5.12 (cli) (built: May 3 2014 07:10:11) Copyright (c) 1997-2014 The PHP Group Zend Engine v2.5.0, Copyright (c) 1998-2014 Zend Technologies $ pcregrep -V pcregrep version 8.33 2013-05-28 $ php -r "phpinfo();" | grep PCRE PCRE (Perl Compatible Regular Expressions) Support => enabled PCRE Library Version => 8.33 2013-05-28 Test script: --------------- #!/bin/sh export GREEDY='\A(?:[^"]++|"(?:[^"]*+|"")*+")+' export POSSESSIVE="$GREEDY+" export TEXT='NON QUOTED "QUOT""ED"' export PATTERN SCRIPT=' $t = getenv("TEXT"); $p = getenv("PATTERN"); preg_match("/$p/", $t, $m); print "$m[0]\n"; ' for PATTERN in "$GREEDY" "$POSSESSIVE" do echo "$TEXT" | pcregrep -o -e "$PATTERN" php -r "$SCRIPT" done Expected result: ---------------- NON QUOTED "QUOT""ED" NON QUOTED "QUOT""ED" NON QUOTED "QUOT""ED" NON QUOTED "QUOT""ED" Actual result: -------------- NON QUOTED "QUOT""ED" NON QUOTED "QUOT""ED" NON QUOTED "QUOT""ED" NON QUOTED -- Edit bug report at https://bugs.php.net/bug.php?id=67235&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=67235&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=67235&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=67235&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=67235&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=67235&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=67235&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=67235&r=needscript Try newer version: https://bugs.php.net/fix.php?id=67235&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=67235&r=support Expected behavior: https://bugs.php.net/fix.php?id=67235&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=67235&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=67235&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=67235&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=67235&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=67235&r=dst IIS Stability: https://bugs.php.net/fix.php?id=67235&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=67235&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=67235&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=67235&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=67235&r=mysqlcfg