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<?php $prefix = 'Korvin!~Korvin@concrete5/79063/Korvin'; $matches = array(); if (preg_match_all('/(.+?)!(.+?)@(.+?)/', $prefix, $matches)) { var_dump($matches); }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 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 - 7.1.10, 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 - 8.2.18, 8.3.0 - 8.3.6
array(4) { [0]=> array(1) { [0]=> string(16) "Korvin!~Korvin@c" } [1]=> array(1) { [0]=> string(6) "Korvin" } [2]=> array(1) { [0]=> string(7) "~Korvin" } [3]=> array(1) { [0]=> string(1) "c" } }

preferences:
195.65 ms | 406 KiB | 311 Q