$re = '/\d{3}\.\d+\.\d+\.\d+/m';
$str = 'The following is an ip address 127.0.0.1
Use the ip 192.168.33.21 to reach home.
188.25.125.105
127.0.1.1';
preg_match_all($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