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<?php $str = "ABcDeFO!.,?:'$#12112"; preg_match_all("/[^AEIOUa-z\W\d]/", $str, $m); var_dump($m);
Output for rfc.property-hooks, git.master, git.master_jit
array(1) { [0]=> array(3) { [0]=> string(1) "B" [1]=> string(1) "D" [2]=> string(1) "F" } }

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