$re = '/^(\+|00)?33(6|7)([0-9]{8})$/m';
$str = '0986423268
01436464654654654
0754554565
0678866556
6078866556
336845269846685
33684526985
33784526985
0033784526985
00337845269855
003378452698
+33784526845
+33584526984
';
preg_match_all($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