Just for clarification: I meant S-expressions for the language in the book (by changing the proposed syntax) so I can dramatically simplify the lexer. But usin

Just for clarification: I meant S-expressions for the language in the book (by changing the proposed syntax) so I can dramatically simplify the lexer. But using s-expressions for regular expression DSL is a given, since I would do it in macros. The resources you linked seem fantastic, thank you!