escape single quotes for xpath in ruby

escape_xpath_single_quotes.rb

  def escape_single_quotes_for_xpath(string)
    if string =~ /'/
      %[concat('] + string.gsub(/'/, %[', "'", ']) + %[')] # horribly, this is how you escape single quotes in XPath.
    else
      %['#{string}']
    end
  end