$re = '/(([1-9][0-9]{2}|[1-9][0-9]|[1-9])\.([1-9][0-9]|[1-9][0-9]{2}|[0-9]))\.([0-9]|[1-9][0-9]|[1-9][0-9]{2})\.([0-9]|[1-9][0-9]|[1-9][0-9]{2})\:([1-9][0-9]{4}|[1-9][0-9]{3}|[1-9][0-9]{2}|[1-9][0-9]|[1-9])/';
$str = '123.123.123.123:12345
123.0.123.2:23
123.01.123.2:23
123.10.123.2:23
0.1.2.3:1
1.0.2.3:1
12.231.21.232:80';
preg_match_all($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