Mod_Rewrite / Regex to PHP URL

I am new to using mod_rewrite and am trying to rewrite a URL to pass values to my script so that:

http://www.myclient.com/everything/animals/mammals/cats

is transformed into

http://www.myclient.com/index.php?nav[0]=everything&nav[1]=animals&nav[2]=mammals@nav[3]=cats

Specifically, I am looking for an n-ary solution to this problem. I know how to do it for a discrete number, but how do I do this transformation when the number of variables to go into the nav array is unknown, and how do I generate the index number? Can any experience mod_rewrite gurus point me in the right direction. I'm sure this is a common design pattern.

Thanks.
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