check_validity!() public

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# File activemodel/lib/active_model/validations/format.rb, line 16
      def check_validity!
        unless options.include?(:with) ^ options.include?(:without)  # ^ == xor, or "exclusive or"
          raise ArgumentError, "Either :with or :without must be supplied (but not both)"
        end

        check_options_validity(options, :with)
        check_options_validity(options, :without)
      end
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