Show @ symbol in different color in clojure mode

Question

I want to show @ symbols (meaning dereference) in red in clojure-mode. How do I do that?

Answer 1

Based on the examples in section Customizing Search-Based Fontification of the elisp manual, I would propose this:

(add-hook 
 'clojure-mode-hook
 (lambda ()
   (font-lock-add-keywords nil
           '(("\\(@\\)" 1 '(:foreground "red") prepend)))))

This uses an anonymous face with red foreground, any face could of course be used.