[[[[\u005B (C99)\U00005B (C99)\x5B (encoding-dependent)\133 (encoding-dependent)??( (until C23)\u{5B} (C++23)\x{5B} (C++23, encoding-dependent)\o{133} (C++23, encoding-dependent)\U0000005B\u005B\x5B (encoding-dependent)\133 (encoding-dependent)\u005B\u{5B}\u005B\x5B\5B\00005B=5B%5B