.htaccess rewritecond [或]

Question

RewriteEngine On
RewriteCond %{REQUEST_URI} ./ext/.*
RewriteCond %{HTTP_COOKIE} !^user_id=.*$ [OR]
RewriteCond %{HTTP_COOKIE} !^customer_id=.*$
RewriteRule ^(.*)$ http://%{HTTP_HOST}/404.php

我想要在cookie上使用isset user_id OR customer_id，它会通过。但这不起作用。