nginx rewrite not working?? it simply ignores it

hi all, i have a wierd problem with nginx, it doesn't want to rewrite...

I have this configuration and i need to pass a hash (40 chars) to a php file it works with apache mod_rewrite but with nginx it isn't i even tried to do simple rewrites, it simply doesn't work

server {
.........
        location / {
            rewrite ^aa$ /downloadTORRENTZ.php break;
            root   /usr/share/nginx/html;
            index  index.html index.htm;
            rewrite  "^([A-Z0-9]{40})$" /file.php?ddl=$1 break;
        }
}

From serverfault PartySoft

• 1. request usually start with / so your regexp should look like

     rewrite "^/([A-Z0-9]{40})$" /file.php?ddl=$1 break;

  2. Is your hash ALLCAPS? Maybe you should use [a-zA-Z0-9]

  3. 40 characters... It looks like sha1 hash. May be you should simplify regexp to [0-9A-F]

  From SaveTheRbtz