IP.Board Rewrite help for IP Content

Hi
I am looking for some help to convert this rerwite rules to nginx:

Code:

RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !.*\.(jpeg|jpg|gif|png|ico)$
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]

If anyone can help please...

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Thanks