Gee... this sounds surprisingly like homework. I've not heard of that particular algorithm, but from the name "trigram match" it seems like you need to search through a series of text for the occurance of a particular trigram (in other words -- three letters or three words in a row).
Thanks for reading and understanding my post when you where searching for this kind of algorithm. As I told you there are three kind of solutions : the metaphone solution, the ontology solution and the match solution. You've chosen the match solution with a trigram match. At this point you have a question about the implementation of this solution, maybe it is best to understand the trigram match before asking for an implementation. [ October 18, 2004: Message edited by: Arnold Reuser ]