- var_dump: documentation ( source)
- preg_match: documentation ( source)
<?php
$url = '/download/b1946ac92492d2347c6235b4d2611184.mp4';
$regex = '/^\/(video|screens|download|strip)\/([\w+]{32})(\.|\/)(\w+)/';
$arrMatch = array();
if (preg_match($regex, $url, $arrMatch)) {
var_dump($arrMatch);
}else{
echo 'NOK';
}