# File lib/selenium/webdriver/support/select.rb, line 272
          def self.escape(str)
            if str.include?('"') && str.include?("'")
              parts = str.split('"', -1).map { |part| %{"#{part}"} }

              quoted = parts.join(%{, '"', }).
                             gsub(/^"", |, ""$/, '')

              "concat(#{quoted})"
            elsif str.include?('"')
              # escape string with just a quote into being single quoted: f"oo -> 'f"oo'
              "'#{str}'"
            else
              # otherwise return the quoted string
              %{"#{str}"}
            end
          end