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<?php preg_match_all("/(user1)(user2)(user3)(user4)(user5)/", "user1 user2 user3 user4 <> user5", $matches); echo "<pre>"; print_r($matches); echo "</pre>";
Output for 4.3.0 - 7.1.0
<pre>Array ( [0] => Array ( ) [1] => Array ( ) [2] => Array ( ) [3] => Array ( ) [4] => Array ( ) [5] => Array ( ) ) </pre>