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<?php $subject = "New tour subscription [ALKJ-102] [ID:12345]"; preg_match("/(?<=\[ID:)\d+/", $subject, $mat); echo $mat[0];
Output for 5.6.38, 7.1.0 - 7.1.24, 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 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
12345
preferences:
186.17 ms | 407 KiB | 5 Q