code: public static ErrorCode isAddressValid(String address){
          if (!isMustFieldValid( address, ipRegEx)) {
              return ErrorCode.SERVICE_INSTANCE_ADDRESS_FORMAT_ERROR;
          }
          return ErrorCode.OK;
      }
docs: Validate the Service Instance address.
  
  It must be the ip address of the node.
  
  @param address
  the address.
  @return
  OK if match the ip pattern.