Let's Run Lisp on a Microcontroller

I just read your interesting article. About thes Lisp/Scheme implementation I guess that you are aware of some JS implementations following Peter Norvig (http://norvig.com/lispy.html) and this is my own: http://epsilonwiki.free.fr/lambdaway/index.php?view=lambdali...

I wrote too an "iconoclastic" Lisp/Scheme dialect built exclusively on regexps which is extremely small and works fine in a wiki context: http://epsilonwiki.free.fr/lambdaway/

I wonder what you could think of such an approach and if regexps are efficiently implemented in a Microcontroller.

Best regards Alain Marty