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clarify
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@ -67,6 +67,9 @@ Summarizing, `ripgrep` is fast because:
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[Rust's regex engine](https://github.com/rust-lang-nursery/regex).
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Rust's regex engine uses finite automata, SIMD and aggressive literal
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optimizations to make searching very fast.
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* Rust's regex library maintains performance with full Unicode support by
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building UTF-8 decoding directly into its deterministic finite automaton
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engine.
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* It supports searching with either memory maps or by searching incrementally
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with an intermediate buffer. The former is better for single files and the
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latter is better for large directories. `ripgrep` chooses the best searching
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