Syntax to Map Virtual-Server's Character with Data-Group which Contains Pool Name

when HTTP_REQUEST {     
    if { [class match [IP::client_addr] equals my_whitelist_dg] } {        
        switch -glob [string tolower [HTTP::uri]] { 
            "/" {                 
                log local0. "redirecting from /"                     
                if { [class match [virtual] equals dg_confarm_pool_routing ] } {                     
                    HTTP::respond 301 Location [lindex [split [class match -value [virtual] equals dg_confarm_pool_routing] ","] 2]                         
                    pool [lindex [split [class match -value [virtual] equals dg_confarm_pool_routing ] ","] 0]                         
                    log local0. "Went to root ( / ), index 0 - WEC pool after index 2 url set with 301"                         
                } else {                     
                    log local0. "Static pool entry for xxxx[LB::server pool] not created yet"                         
                    reject                         
                }                     
                return 
            } 
            "/iss_static*" {                 
                if { [class match [virtual] equals dg_confarm_pool_routing ] } {                     
                    pool [lindex [split [class match -value [virtual] equals dg_confarm_pool_routing] ","] 1] 
                    log local0. "Went to default, index 1 - Confarm pool"                     
                } else { 
                    log local0. "Static pool entry for [virtual] not created yet"                         
                    reject                         
                }                     
                return                     
            } 
            default {                 
                if { [class match [virtual] equals dg_confarm_pool_routing ] } {                     
                    pool [lindex [split [class match -value [virtual] equals dg_confarm_pool_routing ] ","] 0] 
                    log local0. "Went to default, index 0 - WEC pool"                         
                } else { 
                    log local0. "Dynamic pool entry for [virtual] not created yet"                         
                    reject 
                }                     
                return                     
            } 
        }             
    }        
}