Nested iR not working?

log "New request for " + http_host
if (http_host contains one of ValidDomains){
   log "Request matched class ValidDomains"
   log "substr: " + substr(http_uri, 1, '?') 
   if (substr(http_uri, 1, '?') contains one of SecurePages) {
      log "redirecting to https://" + http_host + "/" + http_uri
      redirect to "https://%h/%u"
   }
   else {
      log "Client requested non-secure page, sending to pool"
      use pool mywebfarm
   }
}
else {
   log "Client requested invalid host.  Redirecting to: http://www.mydomain.com/" + http_uri"
   redirect to "http://www.mydomain.com/%u"
}