VS Redirection from uri response

I have found problems trying to route traffic from one VS to another VS and I'm not sure how to get round it.

I have 3 url's similar to below that I want to be redirected to another VS on the ltm.

https://asite.com/eu/?state=register

https:/asite.com/au/?state=register

https://asite.com/int/?state=register

I have tried various settings in an irule as shown below but can't get it to work.

Can someone help me out?

when HTTP_REQUEST {

 if { [string tolower [HTTP::uri]] contains "/register/" }{

virtual vs-abc-443 

}

}

when HTTP_REQUEST {

 if { [string tolower [HTTP::host]] eq "asite.com" and [HTTP::path] eq "/int/?state=register" } {

virtual vs-abc-443

 }

}

when HTTP_REQUEST {

 if { [HTTP::uri] ends_with "register" } {

    virtual vs-abc-443

}

}

when HTTP_REQUEST {

 if { ([HTTP::host] eq "asite.com") && ([string tolower [HTTP::uri]] starts_with "/?state=") } {

  virtual vs-abc-443

}

}