Regexp by Unicode General Category

Question

I'm trying to implement a tokenizer for Haskell, it has a bit involved token structure that can be seen in code here:

https://github.com/ghc/ghc/blob/master/compiler/basicTypes/Lexeme.hs

In regexp-like terms it would be:

(LowercaseLetter|OtherLetter|_)(UppercaseLetter|LowercaseLetter|OtherLetter|TitlecaseLetter|DecimalNumber|OtherNumber|'|_)*ModifierLetter*#*

In human terms: a non-uppercase letter or underscore, followed by any numbers of letters, numbers, underscores, apostrophes followed by any number of modifier letters followed by any number of hashes.

How do I write a regexp in emacs lisp that uses Unicode General Categories as indicated above?

Answer 1

While a regexp based solution seems to be out of the question, you could write your own little matcher, using (get-char-code-property char 'general-category) and comparing it's result to the various Lx and Nx categories.