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