Need help with multi domain url rewrite

To create the same type of functionality with classes, assuming you have at least 2 domains that you want redirected to each location, you'd likely want to use two seperate classes.

You'd create one class for each destination location. I.E.:

class redirect_to_abc {
  "host1.com"
  "host2.net"
  "host3.biz"
}
class redirect_to_xyz {
  "host10.com"
  "host9.us"
  "host8.org"
}

Then you'd create a rule to check to see if the incoming host was in either of those classes, along with a fallback action in case it doesn't land in either bucket.

Something like:

when HTTP_REQUEST {
  if { [matchclass [HTTP::host] ends_with $::redirect_to_abc ] } {
    HTTP::redirect http://www.abc.com
  } elseif { [matchclass [HTTP::host] ends_with $::redirect_to_xyz] } {
    HTTP::redirect http://www.xyz.com
  } else {
    pool fallback_pool
  }
}

As far as your other questions, the wildcard is only usable in a switch statement if you've specified glob style matching. Regarding forcing things to lowercase, it's kind of a habit, but probably wouldn't be necessary for the hostname, though it might be for the URI or many other things you may be comparing.

HTH,

Colin