before i get asked about it - i'm aware of REmatch, a regex engine published at VLDB 2023 (a top database conference) that finds all matches efficiently. REmatch is interesting work, but it operates under all-match semantics, meaning it returns every possible match, including all overlapping ones. for the .*a|b example on a haystack of n b's, there are O(n²) overlapping matches to report - so REmatch's output is itself quadratic. REmatch solves a different problem - enumerating all overlapping spans - and solves it well. but it's not the same problem as finding non-overlapping leftmost-longest matches, which is what grep, ctrl+f, and find_iter do.
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