def is_quoted_string(txt):
    """
    This does not validate chars,    basically because it allows `quoted-pair`,    meaning it allows all valid chars    (``HTAB / SP / VCHAR``)

    :param txt:
    :return:
    """
    assert isinstance(txt, str)
    if len(txt) < 2:
        return False
    if not txt.startswith('"') and not txt.endswith('"'):
        return False
    return True
