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<?php preg_match( '/^\[#(\*)\]/', '[#1234] Subject', $matches); echo $matches[1]; // 1234
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Warning: Undefined array key 1 in /in/vNV56 on line 3
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
Notice: Undefined offset: 1 in /in/vNV56 on line 3
Output for 7.3.32 - 7.3.33
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.1 - 5.1.6, 5.2.0 - 5.2.17
Notice: Undefined offset: 1 in /in/vNV56 on line 3
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/vNV56 on line 3
Process exited with code 255.

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