Split up words using RegExp?

Hi, just wondering if there is a better way to split up words in a sentenc using RegExp. This class is confusing to me, and I would liek to get a better grasp of it. Are there any resources out there that go into depth about RegExp?

What I have done:

var str:String = "I would like to split up words in a sentence";
var re:RegExp = /\s/;
var results:Array = str.split(re);

Is there another more ‘concrete’ way of doing this?