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run code in 200+ php & hhvm versions
Bugs & Features
<?php preg_match( '/^\[#(\d+)\]/', '[#1234] Subject', $matches); echo $matches[1]; // 1234
Output for 4.3.0 - 5.0.5, 5.1.1 - 5.6.30, hhvm-3.10.1 - 3.22.0, 7.0.0 - 7.2.2
1234
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/PWmNb on line 3
Process exited with code 255.