Ah I see. Geoff Langdale (creator of Hyperscan) has a post about this. The comments seem relevant: https://branchfree.org/2019/04/04/question-is-matching-fixed-

Ah I see. Geoff Langdale (creator of Hyperscan) has a post about this. The comments seem relevant: https://branchfree.org/2019/04/04/question-is-matching-fixed-regexes-with-back-references-in-p/ https://branchfree.org/2019/04/04/question-is-matching-fixed...