Parsing remote sites

Hi. I have been able to fetch content from other sites (using a PHP script called "Snoopy"), and print it, but I want to be able to recognize certain words and don't really know where to begin. For example: Let's say the site I fetch has: "Name: John Address: 456 Main Street" Is there a way to get PHP to recognize certain words (like: "Address" in this case) and be able to plug in the result (in this case: 456 Main Street)?? Any help would be appreciated. I really don't know where to begin on this one. Thanks!