$re = '/^(?:[+]6)?0(([0-9]{2}((\s[0-9]{3,4}\s[0-9]{4})|(-[0-9]{3,4}\s[0-9]{4})|(-[0-9]{7,8})))|([0-9]{9,10}))$/m';
$str = '01234567890
+601234567890
012-34567890
+6012-34567890
012-3456 7890
+6012-3456 7890
012 3456 7890
+6012 3456 7890
#invalid:
0122 3456 7890
12 3456 7890
+60122 3456 7890
012345678900
';
preg_match_all($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