来乡村过大年，是今年新春消费新风尚。山东沂南县竹泉村，竹绕泉生，人绕泉居，游客在空中竹林玻璃栈道看演出，沉浸式感受竹文化。浙江宁海县河洪村，古村成了新春市集，人流如织。返乡游、奔县热，为乡村带来了浓浓的年味、旺旺的人气。
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Bidoof started as a joke. Then it became a legend.
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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