About URLrewrite

<Rule
    Look="Search/(\S+)/(\d+)\.aspx"
    Send="Search.aspx?Keywords=$1&City_ID=$2"
  />
 

in IE adress: http://xxx.com/search/ashd123hash/126.aspx
but the real path is : http://xxx.com/search.aspx?Keywords=ashd123hash/126
of course:i need the path is :http://xxx.com/search.aspx?Keywords=ashd123hash&City_ID=126


I don't know why!!!!! So, how can i to change the regex expression
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