Hyperscan November 2020

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Performance of pure literal pattern database vs regular expressions

by David Wharton

Hello, Hyperscan 5.2.0 brought with it the ability to compile pure literals, e.g. hs_compile_lit_multi(). Other than the (arguable) convenience of not having to encode some characters for PCRE, what is the advantage of using the hs_compile_lit function(s) over just the hs_compile ones? Is a pattern database of literals, compiled as such, optimized in such a way as to perform better than if they had been compiled as regular expressions? Thank you. -David Wharton

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