URL rewrite to only match on top level folder

I use windows 2008 server with IIS7 and have created the following URL rewrite rule:

<rule name="Rewrite english to /index.asp">
      <match url="english" />
      <action type="Rewrite" url="index.asp" />
 </rule>

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What this does is when the URL is written as:

www.mywebsite.com/english

It would redirect to:

www.mywebsite.com/index.asp

The only problem is that if there are any files on the website which start with the text "english" then the rule would apply to that filename. I have an image called english-rose.jpg which would not display when this rule was in place. As soon as I removed the rule it was fine.

So what I want is to change the rule so it only matches on /english and no other variation.