check_options_validity

# File activemodel/lib/active_model/validations/format.rb, line 40
      def check_options_validity(options, name)
        option = options[name]
        if option && !option.is_a?(Regexp) && !option.respond_to?(:call)
          raise ArgumentError, "A regular expression or a proc or lambda must be supplied as :#{name}"
        elsif option && option.is_a?(Regexp) &&
              regexp_using_multiline_anchors?(option) && options[:multiline] != true
          raise ArgumentError, "The provided regular expression is using multiline anchors (^ or $), "            "which may present a security risk. Did you mean to use \\A and \\z, or forgot to add the "            ":multiline => true option?"
        end
      end