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run code in 150+ php & hhvm versions
Bugs & Features
<?php $a ='www.'; preg_match( '/[a-z0-9][a-z0-9\-]/', $a, $matches); echo $matches[1]; // 1234
Output for 5.3.0 - 7.1.0
Notice: Undefined offset: 1 in /in/cWbXh on line 4
Output for 4.3.0 - 5.0.5, 5.1.1 - 5.2.17
Notice: Undefined offset: 1 in /in/cWbXh on line 4
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/cWbXh on line 4
Process exited with code 255.