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run code in 200+ php & hhvm versions
Bugs & Features
<?php preg_match( '/^\[#(\d+)\]/', '[#1234567890] Subject', $matches); echo $matches[1]; // 1234
Output for 4.3.0 - 5.0.5, 5.1.1 - 7.2.0
1234567890
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/oOrrK on line 3
Process exited with code 255.