Online PHP editor | refs for heidA

@ 2014-07-02T14:03:10Z

<?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 />';
   }
}