iRule - Direct traffic to specific pools based on host and URI

Maybe something like this would help?

when HTTP_REQUEST { 
set debug 1
set client_info "[IP::client_addr]:[TCP::remote_port]: [HTTP::host][HTTP::uri]"

if { $debug } {
    log local0.  "$client_info requests [HTTP::host] and [HTTP::uri]"
}
if { [string tolower [HTTP::uri]] starts_with "/login" } {
    if { $debug } { log local0.  "$client_info - line 9 selected - pool is Pool_Admin_64" }
    pool Pool_Admin_64 
}
elseif { [string tolower [HTTP::uri]] starts_with "/lz/"  } {
    if { $debug } { log local0.  "$client_info - line 14 selected - pool is Pool_Landing_64" }
    pool Pool_Landing_64 
}
elseif { [getfield [string tolower [HTTP::host]] ":" 1] eq "www.communigator.co.uk"} {
    if { $debug } { log local0.  "$client_info - line 19 selected - pool is Pool_Website" }
    pool Pool_Website 
}
else {
    if { $debug } { log local0.  "$client_info - line 24 selected - No Match, using default" }
}}