Variable: haskell-lexeme-id
haskell-lexeme-id is a variable defined in haskell-lexeme.el.
Value
"[[:alpha:]_][[:alnum:]'_]*"
Documentation
Regexp matching a valid Haskell identifier.
GHC accepts a string starting with any alphabetic character or underscore followed by any alphanumeric character or underscore or apostrophe.
Source Code
;; Defined in /nix/store/9lz2mhw95f9fqxr9mnq46k3f6qz3aq83-emacs-packages-deps/share/emacs/site-lisp/elpa/haskell-mode-20260904.1042/haskell-lexeme.el
(defconst haskell-lexeme-id
"[[:alpha:]_][[:alnum:]'_]*"
"Regexp matching a valid Haskell identifier.
GHC accepts a string starting with any alphabetic character or
underscore followed by any alphanumeric character or underscore
or apostrophe.")