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This one's great as well for understanding RegEx FSM's: http://rise4fun.com/rex

Hey thanks! I fed the inverse fizzbuzz regex to Rex and it came up with an automaton with 81 states! http://www.jasq.org/uploads/1/0/5/6/10564637/6329774.png?694

My original automaton only has 8 states. ( http://www.jasq.org/uploads/1/0/5/6/10564637/977128_orig.png ) I guess that's the price you pay for cycles. ( Mine is a cyclic graph, but Rex produces a directed acyclic graph. Since they both must capture the same regex, one of them would be much larger than the other )

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