sS discord_regionalIndicatorFont(S s) {
  new StringBuilder buf;
  for (char c : characters(s)) {
    char u = lower(c);
    if (u >= 'a' && u <= 'z')
      buf.append(" :regional_indicator_").append(u).append(": ");
    else if (u == ' ' || u == '\t')
      buf.append(" :small_blue_diamond: ");
    else
      buf.append(c);
  }
  ret simpleSpaces_noTok(str(buf));
}