mod_rewrite - my regex is half right... or half wrong!

Hello,

I'm trying to use mod_rewrite for friendly URLs - I've got it half working, and I've read so much documentation it's coming out of my ears :-/

So here's the deal - I want URLs in either of these forms:

http://domain/foo?querystring
http://domain/foo/?querystring

to be silently converted to

http://domain/?unique_name=foo&querystring

My current .htaccess works fine for the first of these, but fails on the second, and I can't trace the problem. I'd be really grateful if someone could point out my mistake. The file looks like this:

      1 #ErrorDocument 404 /index.php
      2 
      3 RewriteEngine  on
      4 #RewriteBase /
      5 
      6 RewriteCond    %{REQUEST_URI} ^/[^/]+/
      7 RewriteRule    ^([^/]).*$     $1 [QSA]
      8 
      9 RewriteCond    %{REQUEST_URI} !^/index\.
     10 #RewriteCond   %{REQUEST_URI} ^/[^/]+$
     11 RewriteCond    %{REQUEST_FILENAME} !-f
     12 RewriteCond    %{REQUEST_FILENAME} !-d
     13 RewriteCond    %{REQUEST_FILENAME} !-l
     14 RewriteRule    ^([^/]+) /?unique_name=$1 [L,QSA]

Code (markup):

I've tried a lot of stuff...

Thanks very very much!

Ben