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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值得一提的是,今年的全国两会上,国家发展规划法草案也将提请全国人大会议审议。其中,国家发展规划法草案三审稿增加规定,编制国家发展规划应当“坚持顶层设计和问计于民相统一”。通过立法,把成熟做法固定为法律制度,将为保障“一张蓝图绘到底”提供有力制度支撑。
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constructor(id: string, state: [string, number, T]) {