[racket] a simple? regexp-match/replace

Hey noel, thank you, it works perfectly.

However, i have the following problem : i can't modify my cookie-value ...
my blog starts with
(define start request)
  ( my-home-page request))

next,
(define (my-home-page request)
  (define foo (make-cookie "id" "my-content")
  (set! foo (set-cookie "id" "another content") ;; so now the content of the
cookie has changed
...
 `(html (body (p ,(print-cookie foo))
  (a (href 'a-link to (a-post request))" "link")
))))

;;;;;
(define (a-post request)
   (set! foo (set-cookie "id" "master content")) ;; here, why can't modify
my cookie value ?
...
)))

(serve/servlet start)

I don't understand : i start my blog wich calls (my-home-page), and this one
creates a cookie. But in (a-post request) i can't i modify my cookie,
because foo is an unknown word ...
How can i retrieve the content of my cookie in my (a-post ...) function ?

thanks for your help,
-mw
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