As is so often the case, Emacs already has a mature implementation of this built-in: https://www.gnu.org/software/emacs/manual/html_node/elisp/Rx-Notation.html

As is so often the case, Emacs already has a mature implementation of this built-in: https://www.gnu.org/software/emacs/manual/html_node/elisp/Rx-Notation.html https://www.gnu.org/software/emacs/manual/html_node/elisp/Rx...