3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php preg_match( '/^\[#(\d+)\]/', '[#1234] Subject', $matches); echo count($matches); // 1234
Output for 4.3.0 - 5.0.5, 5.1.1 - 7.1.0
2
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/Jg95J on line 3
Process exited with code 255.