$re = '/(\d{16})|(\d{4}\s\d{4}\s\d{4}\s\d{4})|(\d{4}\-?\d{4}\-?\d{4}\-?\d{4})/';
$str = '4943517653713763
4552 0518 0032 8285
4784-4511-1142-3090';
preg_match_all($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