code: public static IndexOfInfo indexOfLast(final String str, final String... delimiters) {
          return doIndexOfLast(false, str, delimiters);
      }
docs: Get the index of the last-found delimiter.
  <pre>
  indexOfLast("foo.bar/baz.qux", ".", "/")
  returns the index of ".qux"
  </pre>
  @param str The target string. (NotNull)
  @param delimiters The array of delimiters. (NotNull)
  @return The information of index. (NullAllowed: if delimiter not found)