Lazy DFAs (2010) are a clever optimization to mitigate the O(2^m) blowup of DFA construction, by only constructing the states that you actually visit. lazy DFAs reduce the theoretical automata construction time to either O(2^m) or O(n), whichever is lower. you could argue that it’s theoretically no longer linear time, since you could have a regex that creates a new state for every character in the input, but in practice you will keep revisiting the same states. for all intents and purposes it behaves more like O(n) with some initial wind-up time. the main downside of lazy DFAs is that they are more complex to implement, and you have to ship a compiler as part of your regex algorithm. i want to highlight Rust regex and RE2 as excellent implementations of this approach, which you can also see in the benchmarks.
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你比如说在中渡桥战役中，殉国的王清将军等等，这些人都是那个时期涌现出来的好汉子、真豪杰，像这样的一些人物他们都没有能够进来。不是说在历史上这些人不重要、不精彩，而是在我们的这条表达线上，在选择的轻重缓急上，我们没有选择他，因为我们在顺着表达线走，不是去平铺五代十国的全景。人物上如此，故事上更是如此。