Nginx YOURLS rules

location / {
	# If the file exists as a static file serve it directly without
    	# running all the other rewite tests on it
    	if (-f $request_filename) {
      		expires max;
      		break;
    	}

    	if (!-f $request_filename){
       		set $rule_0 1$rule_0;
    	}

    	if (!-d $request_filename){
       		set $rule_0 2$rule_0;
    	}

   	if ($rule_0 = "21"){
       		rewrite ^/.* /yourls-loader.php last;
    	}
}