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<?php $LinkRegex = '/(?!(\d+\/\d+)\s*(\d{7,10})\s*)(?<Link>[0-9]{1,2}\/[0-9]{1,2}:?[0-9]?[0-9]?)/'; preg_match_all($LinkRegex, "21/8 664922003 0 0 1 21/1:26,21/1:27,21/1:28", $LinkMatches); var_dump($LinkMatches);
Output for git.master, git.master_jit, rfc.property-hooks
array(5) { [0]=> array(3) { [0]=> string(7) "21/1:26" [1]=> string(7) "21/1:27" [2]=> string(7) "21/1:28" } [1]=> array(3) { [0]=> string(0) "" [1]=> string(0) "" [2]=> string(0) "" } [2]=> array(3) { [0]=> string(0) "" [1]=> string(0) "" [2]=> string(0) "" } ["Link"]=> array(3) { [0]=> string(7) "21/1:26" [1]=> string(7) "21/1:27" [2]=> string(7) "21/1:28" } [3]=> array(3) { [0]=> string(7) "21/1:26" [1]=> string(7) "21/1:27" [2]=> string(7) "21/1:28" } }

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