def _check_validators(text)
      ret = true
      if @validator_objects
        @validator_objects.each do |v|
          v.validate(text)
          unless v.is_valid
            @last_error_message = v.message
            ret = false
          end
        end
      end
      ret
    end
def _check_validators(text)
      ret = true
      if @validator_objects
        @validator_objects.each do |v|
          v.validate(text)
          unless v.is_valid
            @last_error_message = v.message
            ret = false
          end
        end
      end
      ret
    end
Validates a text against the validators for this Pref
 @param [String] text The text to validate
 @return [Boolean]