$re = '/^([^\|]{1,20})\|([^\|]{3,50})\|(([\d]{4}){4})\|((0[1-9]|1[0-2])(0[1-9]|[1-9][0-9]))$/';
$str = 'ma cb|Moreau Marc|1234567890123456|0125';
preg_match($re, $str, $matches, PREG_OFFSET_CAPTURE, 0);
// Print the entire match result
var_dump($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