class AWS::Record::FormatValidator

def message
  options[:message] || 'is invalid'
end

def setup record_class
  ensure_type(Regexp, :with, :without)
  ensure_at_least_one(:with, :without)
end

def validate_attribute record, attribute_name, value_or_values
  each_value(value_or_values) do |value|
    if options[:with]
      unless value.to_s =~ options[:with]
        record.errors.add(attribute_name, message)
      end
    end
    if options[:without]
      unless value.to_s !~ options[:without]
        record.errors.add(attribute_name, message)
      end
    end
  end
end