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run code in 200+ php & hhvm versions
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<?php $page='asd'; preg_match('#([A-Za-z0-9\-\_]*)#', $page, $matches); var_dump($matches);
Output for 4.3.0 - 7.2.0
array(2) { [0]=> string(3) "asd" [1]=> string(3) "asd" }