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<?php preg_match( '/^\[#(\d+)\]/', '[#3231321] Subject', $matches); echo $matches[1]; // 1234
based on PWmNb
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/beX1b on line 3
Process exited with code 255.