$re = '/^(([5,6,7,8,9]{1})([0-9]{1})([0,1,2,3,5,6,7,8]{1})([0-9]{6})([v|V|x|X]))|(([1,2]{1})([0,9]{1})([0-9]{2})([0,1,2,3,5,6,7,8]{1})([0-9]{7}))/m';
$str = '880053611V
198800503611
978561353V
199785601355
920600073V
199206000073';
preg_match_all($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