static bool endsWithIgnoreCase(S a, S b) {
  int la = l(a), lb = l(b);
  ret la >= lb && regionMatchesIC(a, la-lb, b, 0, lb);
}

ifclass Matches
static bool endsWithIgnoreCase(S a, S b, Matches m) {
  if (!endsWithIgnoreCase(a, b)) false;
  if (m != null)
    m.m = new S[] { substring(a, 0, l(a)-l(b)) };
  true;
}
endif