Here’s a quick tip.  If you have text that contains urls (i.e. tweets) and want the urls in the text to appear as actual links via HTML, use the following RegEx:

[sourcecode lang=”javascript”]

var message = “Here is some tweet text. Check out: http://www.google.com";

var exp = /(b(https?|ftp|file)://[-A-Z0-9+&@#/%?=~_|!:,.;]*[-A-Z0-9+&@#/%=~_|])/ig;

message = message.replace(exp, “\$1”);

[/sourcecode]