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run code in 150+ php & hhvm versions
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<?php $usernames = array('asdasd123', 'asdas_asdasd123', 'asdsad--asdsa123123', 'asdasd<><><>'); foreach($usernames as $u) { if(preg_match('([A-Za-z0-9\-\_]+)', $u)) { echo $u.' is totally valid <br />'; } else { echo $u. 'is not valid <br />'; } }
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
asdasd123 is totally valid <br />asdas_asdasd123 is totally valid <br />asdsad--asdsa123123 is totally valid <br />asdasd<><><> is totally valid <br />