static bool singleEllipsisMatchIC(S pat, S s, Matches m) {
  int i = indexOf(pat, "...");
  if (i < 0) ret eqic(pat, s);
  if (!regionMatchesIC(s, 0, pat, 0, i)) false;
  int lSuffix = l(pat)-(i+3);
  if (!regionMatchesIC(s, l(s)-lSuffix, pat, i+3, lSuffix)) false;
  if (m != null)
    m.m = new S[] {substring(s, i, l(s)-lSuffix)};
  true;
}

static bool singleEllipsisMatchIC(S pat, S s) {
  ret singleEllipsisMatchIC(pat, s, null);
}