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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If you’re looking for a mattress larger than a king or California king, you’ll need to reach out to your preferred mattress company or a mattress retailer to see what they offer. Before you purchase a custom-made or extra-large bed, however, keep in mind mattress “musts,” like your sleeping position and ideal level of support and firmness, and the fact that your choices may be more limited. You’ll also need to be more creative when finding sheets that will fit an extra-large or custom-made mattress.
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