$re = '/^\+?\(?([0-9]{2,4})[)\s.-]+([0-9]{3,4})([\s.-]+([0-9]{3,4}))?$/mi';
$str = '(94) 123 345
(94).456.7899
(94)-456-7899
94-456-7899
+94 456 7899
94 456 7899
0094 456 7899
(94) 123
122 3454';
preg_match_all($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