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<?php preg_match("/([user1])[user2][user3][user4][user5]/", "user1user2user3user4user5", $matches); echo "<pre>"; print_r($matches); echo "</pre>";
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
<pre>Array ( [0] => 1user [1] => 1 ) </pre>