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.
"It is well known that big, incriminating stuff has been redacted from what Pam Bondi released," says Stephen Colbert in the Late Show clip above. "And yesterday we got confirmation that the DOJ has withheld or taken down more than 50 pages of material from the Epstein files related to Donald Trump. And it's totally on brand for the DOJ — this DOJ especially — to be protecting Trump. It's the least surprising headline since 'Youngest Child Becomes Theatre Major'."
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February 27, 2026 at 12:31 PM UTC
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