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run code in 150+ php & hhvm versions
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<?php preg_match( '/^\[#(\d+)\]/', '[#3231321] Subject', $matches); echo $matches[0]; // 1234
based on beX1b
Output for 4.3.0 - 5.0.5, 5.1.1 - 7.1.0
[#3231321]
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/Nhslu on line 3
Process exited with code 255.