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<?php preg_match('#((\d+)\s+year(s)?(,\s+)?)?((\d+)\s+week(s)?(,\s+)?)?((\d+)\s+day(s)?(,\s+)?)?((\d+)\s+hour(s)?(,\s+)?)?((\d+)\s+minute(s)?(,\s+)?)?((\d+)\s+second(s)?)?#', '21 minutes, 34 seconds', $match); var_dump($match);
Output for git.master, git.master_jit, rfc.property-hooks
array(24) { [0]=> string(22) "21 minutes, 34 seconds" [1]=> string(0) "" [2]=> string(0) "" [3]=> string(0) "" [4]=> string(0) "" [5]=> string(0) "" [6]=> string(0) "" [7]=> string(0) "" [8]=> string(0) "" [9]=> string(0) "" [10]=> string(0) "" [11]=> string(0) "" [12]=> string(0) "" [13]=> string(0) "" [14]=> string(0) "" [15]=> string(0) "" [16]=> string(0) "" [17]=> string(12) "21 minutes, " [18]=> string(2) "21" [19]=> string(1) "s" [20]=> string(2) ", " [21]=> string(10) "34 seconds" [22]=> string(2) "34" [23]=> string(1) "s" }

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