Natural language parsing

I'm creating a chatbot that pulls posts from BBS style forums as it's input for learning, but I can't decide which method of natural parsing I should work with.

I'd like the learning to be fairly unsupervised, and I'm using a neural net model for learning. I've got the more complicated bits worked out on paper, but I've never had to parse natural language before. So I was hoping some of my favorite code junkies could point me in the right direction! Any suggestions?
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