need help to get uri to work regardless of any extra characters

I confirmed "starts_with" in my irule calling a uri from a data class was working if any other characters were added, it just did not work correctly and/or broke with no redirect. Why? I really am at a loss. "Contains" also does not work, so it must be the nature of how the irule was written. Below is the key ingrediants so anyone can spot something, have at it.

 

 

when HTTP_REQUEST {

 

set my_uri [string trimright [HTTP::uri] "/" ]

 

Determine if you are trying to go to a site that has a vanity URL

 

if {[class match [string tolower [HTTP::uri]] contains www_vanity_url_redirection]}{

 

set vanity_path [class search -value www_vanity_url_redirection starts_with [string tolower [HTTP::uri]]]

 

HTTP::redirect $vanity_path

 

} else {

 

Do nothing

 

unset set my_uri

 

}

 

}