def extract(string, start='(', stop=')'):
    """
    Extract the string that is contained between start and stop strings
    :param string: str, string to process
    :param start: str, start string
    :param stop: str, stop string
    :return: str, extracted string
    """

    try:
        return string[string.index(start) + 1:string.index(stop)]
    except Exception:
        return string