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run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = 123456789; if (preg_match($a, '/^\d{9}$/')) { echo "match"; } ?>
Output for 4.3.11 - 7.1.10
Warning: preg_match(): Delimiter must not be alphanumeric or backslash in /in/iZGSW on line 3
Output for 4.3.0 - 4.3.10
Warning: Delimiter must not be alphanumeric or backslash in /in/iZGSW on line 3