sS discord_regionalIndicatorFont(S s) {
  new StringBuilder buf;
  for (char c : characters(s)) {
    char u = upper(c);
    if (u >= 'A' && u <= 'Z')
      buf.append(":regional_indicator_").append(u).append(":");
    else
      buf.append(c);
  }
  ret str(buf);
}