def METHOD_NAME(cls, exe):
    """Return the version of the provided executable or ``None`` if
    the version cannot be determined.
    Arguments:
        exe (str): absolute path to the executable being examined
    """
    output = Executable(exe)("-V", output=str, error=str)
    match = re.search(r"Berkeley DB\s+([\d\.]+)", output)
    return match.group(1) if match else None