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<?php preg_match_all( '/^\--(\d+)\/', '[--1234] Subject', $matches); print_r($matches); // 1234
Output for 5.2.0 - 5.2.17, 5.3.0 - 5.3.13, 5.3.15 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
Warning: preg_match_all(): No ending delimiter '/' found in /in/HKPMX on line 2
Output for 5.3.14

Process exited with code 137.
Output for 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.1 - 5.1.6
Warning: preg_match_all(): No ending delimiter '/' found in /in/HKPMX on line 2 Array ( )
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/HKPMX on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.10
Warning: No ending delimiter '/' found in /in/HKPMX on line 2 Array ( )
preferences:
203.96 ms | 401 KiB | 315 Q