def replace_tokens(string)
      data = string.dup
      @tokens.each do |name, val|
        data.gsub!(/\:#{name}/, val.to_s)
      end
      data
    end
def replace_tokens(string)
      data = string.dup
      @tokens.each do |name, val|
        data.gsub!(/\:#{name}/, val.to_s)
      end
      data
    end
Replace any token inside string

 @param [String] string
   the string containing tokens

 @return [String]

 @api private