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<?php $str = "5391898ad96363ea4f8b45ed"; $x = preg_match("~^[0-9a-f]{24}$~", $str, $z); var_dump($x,$z);
Output for git.master, git.master_jit, rfc.property-hooks
int(1) array(1) { [0]=> string(24) "5391898ad96363ea4f8b45ed" }

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