Unescaping backreferences in mod_rewrite to embed email address in url?

["Ramon Felciano" <felciano@xxxxxxxxx>]

Hi --

Is it possible to have mod_rewrite unescape backreferences? I would like to allow users to access resources through a user-specific URLs, created by embedding a user-provided email address in the URL:

/docs/testuser@xxxxxxxxx

I have a form that allows users to enter their email and submits a GET to a CGI:

http://www.example.com/cgi-bin/test.cgi?email=testuser%40yahoo.com

I've created a mod_rewrite rule to trap the above pattern and rewrite it:

RewriteCond %{QUERY_STRING} email=([\w@0123456789%\.]+)$
RewriteRule ^/cgi-bin/test.cgi /docs/%1 [PT]

The above is not a very sophisticated email match, but works for this example. This gives me:

/docs/testuser%40yahoo.com

Is there a way to tell mod_rewrite to un-escape the matched backreference so I get the @ sign in the URL instead of %40?

Thank you in advance!

Ramon