$re = '/(^\+?[\d\s?]{10,15})/m';
$str = '004219126559874
0908312334
+421908332314
+420987654321
+420 987 654 321
+421 223 987 828
0913987654';
preg_match_all($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