$re = '/^[1-9]{1}$|^[1-3]{1}[0-9]{1}$|^4{1}[0-5]{1}$/m';
$str = '1
2
74
45
46
';
preg_match_all($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