fix case of markup inside bird tracks.
-- ^ Returns: 'Nothing' if the regex did not match the
-- string, or:
--
- -- > 'Just' (everything before match,
- -- > matched portion,
- -- > everything after match,
- -- > subexpression matches)
+ -- @
+ -- 'Just' (everything before match,
+ -- matched portion,
+ -- everything after match,
+ -- subexpression matches)
+ -- @
regexec (Regex regex_fptr) str = do
withCString str $ \cstr -> do