in RE#, we solve this by encoding the context information in the state itself. below, you can see the state machine for the regex ab(?=cd), which matches an ‘ab’ only if it’s followed by a ‘cd’. encoded in the final state, is the information that the match actually happened two characters ago.
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，这一点在heLLoword翻译官方下载中也有详细论述
lookup table that tells you characters a-z belong in class 1, and the rest in class 0
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