$re = '/^(?:\((?:\+44\d{4}|\d{5})\)|\+44\d{3}|\d{5}) ?\d{6}$/m';
$str = '07384323455
(01273)277364
01677 336482
+44786655433
(+441234)123456';
preg_match_all($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