3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = 'Ukraine - Russia or Iran - Argentina'; preg_match('', $a, $m); echo $m;
Output for 5.2.0 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_match(): Empty regular expression in /in/g4CRe on line 3
Output for hhvm-3.10.0 - 3.12.0
Warning: Empty regular expression in /in/g4CRe on line 3
Output for 4.3.11 - 5.1.6
Warning: preg_match(): Empty regular expression in /in/g4CRe on line 3 Array
Output for 4.3.0 - 4.3.10
Warning: Empty regular expression in /in/g4CRe on line 3 Array