Regular Expression to Find All Mentioned Names by ‘@’

I have seen a cool example about it at Junal vai's blog. Here is a shortcut example of it..

1. function name_from_at($string)
2. {
3.     $pattern = "/@([a-zA-Z0-9]+)/i";
4.     preg_match_all($pattern,$string,$array);
5.     return $array[0];
6. }

Enjoy..... Help the people of Haiti......