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<?php preg_match( '/^\[#(\d+)\]/', '[#1234] Subject', $matches); print_r($matches); // 1234
Output for 4.3.0 - 5.0.5, 5.1.1 - 7.1.0
Array ( [0] => [#1234] [1] => 1234 )
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/ngJrf on line 3
Process exited with code 255.