// works on lists and strings and null

static int indexOfIgnoreCase(L<S> a, S b) {
  int n = l(a);
  for i to n:
    if (eqic(a.get(i), b)) ret i;
  ret -1;
}

static int indexOfIgnoreCase(S a, S b) {
  Matcher m = Pattern.compile(b, Pattern.CASE_INSENSITIVE + Pattern.LITERAL).matcher(a);
  if (m.find()) return m.start(); else ret -1;
}