Bug #74612 [NEW]: Usage of a back reference to a branch reset group

From: oleynikovny at mail dot ru Operating system: GNU/Linux PHP version: 7.1.5 Package: PCRE related Bug Type: Bug Bug description:Usage of a back reference to a branch reset group Description: ------------ A backreference to a branch reset group works as expected in PHP 5 but not in PHP 7. Test script: --------------- <?php $string = '--'; $doesNotMatchInPhp7 = '/(?|(---)|(-))\1$/'; $matchesInPhp7 = '/(?|(-)|(---))\1$/'; var_dump(preg_match($doesNotMatchInPhp7, $string)); var_dump(preg_match($matchesInPhp7, $string)); -- Edit bug report at https://bugs.php.net/bug.php?id=74612&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=74612&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=74612&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=74612&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=74612&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=74612&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=74612&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=74612&r=needscript Try newer version: https://bugs.php.net/fix.php?id=74612&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=74612&r=support Expected behavior: https://bugs.php.net/fix.php?id=74612&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=74612&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=74612&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=74612&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=74612&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=74612&r=dst IIS Stability: https://bugs.php.net/fix.php?id=74612&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=74612&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=74612&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=74612&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=74612&r=mysqlcfg