$re = '/((?:\+|00)[17](?: |\-)?|(?:\+|00)[1-9]\d{0,2}(?: |\-)?|(?:\+|00)1\-\d{3}(?: |\-)?)?(0\d|\([0-9]{3}\)|[1-9]{0,3})(?:((?: |\-)[0-9]{2}){4}|((?:[0-9]{2}){4})|((?: |\-)[0-9]{3}(?: |\-)[0-9]{4})|([0-9]{7}))/m';
$str = '(123) 456-7890
(123)456-7890
123-456-7890
123.456.7890
1234567890
+31636363634
075-63546725';
preg_match_all($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