Amazed at how well this works really.pic.twitter.com/h55RuLdmya
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DFA: Deterministic Finite Automaton NFA: Non-Deterministic Finite Automaton In an NFA an event may transition to multiple different destination states, while in a DFA an event must have a deterministic destination. The NFA basically has an additional runtime aspect to it.
Worth noting that every NFA can be turned into a DFA, which is a common operation in regex engines. The regex crate interestingly (afaik) uses a dynamic mix of both, as the conversion can cause a state explosion, which can become a problem. (cc @burntsushi5)
Both are "Finite Automatons" (state machines), but with the difference that in DFA (deterministic), one transition is allowed per input. In NFA (Non-Deterministic), an input may trigger _multiple_ transitions, essentially allowing the process to "split".
Imagine the regex "nun|nan". That could be described in an NFA as "if you read 'n', your either in the left path or the right path, but it hasn't been determined yet", in DFA, this isn't allowed.
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