"Parsing with Derivatives". http://matt.might.net/papers/might2011derivatives.pdf There's a lot of stuff about this online now

Or just use Prolog.

(I'm not joking. I've been messing with parsers and such in Prolog the past week or so and I'm just blown away. I'm happy but also I feel stupid for not learning it sooner. I've wasted so much time and effort. I've been working too hard. Just learn Prolog and then use it, the total time saved will pay for the learning curve by the end of the year.)