@James, I think he means "words" by saying tokens, because, as he said, he wants "this" from "i want this". So I guess he wants to extract the third word.
[EDIT: Almost forgot this; dude gedas use a loop and a variable, name it as, say word_count and initialize it to 0. Loop through your string and increase word_count by 1 for every space you encounter. After the second space, you'll be on the third word. Loop through and record the String till the next space, and print to the screen.]