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run code in 200+ php & hhvm versions
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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 - 7.2.0
<pre>Array ( [0] => 1user ) </pre>