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I wish it were more common or accepted to use parser combinator libraries in place of Regex. Libraries like Parsec are basically this but integrate into the target language and can be used to atomize and combine parse expressions and therefore be written in a much more readable way.
It looks like the checkr extension could greatly benefit from something like this. Very nice work! Excited to try it out when I have some free time.
That is a huge, and generally invalid, assumption: in practice, regex do not compose well under concatenation. In fact, what you’ve done is the equivalent of C macros: mixing languages across multiple levels which are unaware of each others’ syntax rules. A long time ago I wrote a proper regex concatenation function for a library, and … it’s not trivial (the code is PHP but the logic would be similar in other languages).
Heh funny, I did something like this 6-7 years ago too https://github.com/devshorts/ComposableRegex