def find_first_match regex #:nodoc:
      @list.each_with_index do |row, ix|
        return ix if !row.match(regex).nil?
      end
      return nil
    end
def find_first_match regex #:nodoc:
      @list.each_with_index do |row, ix|
        return ix if !row.match(regex).nil?
      end
      return nil
    end
returns row of first match of given regex (or nil if not found)