Unhelpful answer: emacs `replace-regexp` can do this. https://emacs.stackexchange.com/questions/50220/emacs-replace-regexp-reference-the-match-in-the-replace-a

Unhelpful answer: emacs `replace-regexp` can do this. https://emacs.stackexchange.com/questions/50220/emacs-replace-regexp-reference-the-match-in-the-replace-argument https://emacs.stackexchange.com/questions/50220/emacs-replac...