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Is this post showing a bug in HN? It says it was posted 10 hours ago, but Algolia says it was posted 2 days ago
https://hn.algolia.com/?dateRange=pastWeek&page=0&prefix=tru...
And mehulashah's comment that the thread claims was posted 7 hours ago was also posted two days ago, according to Algolia
https://hn.algolia.com/?dateRange=pastWeek&page=0&prefix=tru...
https://github.com/BurntSushi/rebar
For regex, you can't really distill it down to one single fastest algorithm.
It's somewhat similar even for substring search. But certainly, the fastest algorithms are going to be the ones that make use of SIMD in some way.