Need help translating this htaccess rewrite rule to Nginx

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http://serverfault.com – Hi – I've been struggling with this for days. It seems simple but I just can't get it done. I have a site developed in CakePHP. There's a script that responds to /css/profiles/g/whatever.css ("whatever" being whatever, it is actually a parameter that gets passed to the action), it echoes a generated CSS and saves it to /css/profiles/whatever.css. I have a rule in Apache that takes requests to /css/profiles/whatever.css and, if it doesn't exist, rewrites the request to /css/profiles/g/whatever.css without redirecting, so the client never notices it was responded by a script and that the f (HowTos)