Parsing a simple sql string in php

Hiya, has anyone had any experience with parsing a string of sql to break it down into its component parts? At the moment I'm using several regex's to parse a string, which works, but I'm sure there's a more elegant solution. The general idea is to produce a nice looking page giving details of updated fields and values. I'm only concerned with update statements really, and the queries are very simple, operating on one table at a time, with no sub queries or selects. Thanks in advance if anyone is able to suggest anything! Thanks Ash