Replace Links With Html

You can replace links with html tag using PHP regular expression.
Here is an example of it.

1. function replace_link_with_link($string)
2. {
3.     $pattern = "|http://(\w+)([A-Z0-9-_:./?]+)*|i";
4.     $string = preg_replace($pattern,'<a href="\0">\0</a>',$string);
5.     return $string;
6. }

Enjoy. Help Helpless.