code: private void parseCountries(List<String> content) throws Exception {
          for (String line : content) {
              Matcher matcher = COUNTRY_REGEX_LINE.matcher(line);
              if (matcher.matches()) {
                  String countryCode = matcher.group(1);
                  String currencyCode = matcher.group(2);
                  registerCountry(countryCode, currencyCode);
              }
          }
      }
docs: parse the countries