iRule Newbie - Limit Access to URIs based on IP Source

Thanks - I have change thins a little by creating a address-class datagroup which has the permitted IP addresses. This is used on the following iRule:

when HTTP_REQUEST { 
   if { [string tolower [HTTP::path]] contains "/web/landing_page" } { 
      if { !([matchclass [IP::client_addr] equals Test_Allowed_IPs])} { 
         discard 
      }
   }
}
 

This working with initial testing.

Rgds,

Mark