Change this nginx rewrite to apache htaccess

[Milli Sami]

The following post explains about the page caching in rails with Nginx.

http://blog.hasmanythrough.com/2008/1/30/segregated-page-cache-storage

I like to implement this solution with my app but on Apache. So, the
main block/route is

  if (-f $request_filename) {
    break;
  }
    if (-f /cache$request_filename) {
    rewrite (.*) /cache$1 break;
    break;
  }

  if (-f /cache$request_filename.html) {
    rewrite (.*) /cache$1.html break;
    break;
  }
What could be the Apache equivalent for the above Nginx related code??
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