There are 4 C++ benchmark submissions for regex-dna. One of them does indeed use boost, but it is significantly slower than RE2: <a href="https:&#x2F;&#x2F;benchmarksgame.alioth.debian.org&#x2F;u64q&#x2F;program.php?test=regexdna&amp;lang=gpp&amp;id=3" rel="nofollow">https:&#x2F;&#x2F;benchmarksgame.alioth.debian.org&#x2F;u64q&#x2F;program.php?te...</a> --- I don&#x27;t know much about boost&#x27;s regex support, but after a quick search, it does support backreferences, so it&#x27;s likely a backtracking implementation. It&#x27;s no surprise to me that it is beaten handedly by an implementation that uses DFAs (RE2, and in this case, Rust&#x27;s regex library as well).