iRule path redirect doesn't work with question mark

since ?cont= is part of HTTP query instead of uri, iRule would need to look for HTTP::query. You can try below or modify if you need to use switch statment for query as well.

when HTTP_REQUEST {
if { [HTTP::query] starts_with "cont=" }{
pool WEB
return
}
switch -glob [string tolower [HTTP::path]] {
"/en/*" -
"/r/*" - 
"/kn/*" - 
"/up/*"
{ 
pool WEB
} default { 
pool PRO
    }
  }
}