# File lib/rbrainz/model/isrc.rb, line 60
      def initialize(isrc)
        unless isrc.to_s =~ ISRC_PATTERN
          raise InvalidISRCError
        end
        @country = $1.upcase
        @registrant = $2.upcase
        @year = $3.upcase
        @designation = $4.upcase
      end