$re = '`^[A-Za-z0-9\-]{5,30}$`m';
$str = '98b8d46a4484729c712a79d7473bdc23
98b8d46a4484729c712a79d7473bdc
5-35XES36D
20160401150146120SME099935';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php