$re = '/^(\d+) <(\w+)> (\d+) (\d+) (\d+) (?:(\d+) )?</\w+>$/';
$str = '1111 <CARRE> 123 321 111 222 </CARRE>
2222 <RECTANGLE> 234 432 333 444 </RECTANGLE>
3333 <CERCLE> 345 543 555 </CERCLE>
4444 <OVALE> 456 654 666 777 </OVALE>
5555 <LIGNE> 567 765 888 999 </LIGNE>';
preg_match_all($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