import re


def check_date_format(date: str):
    """Parses a string for a date. Returns true if 
    date is any of the following formats:
    MM/DD/YYYY
    MM/DD
    DD

    Arguments:
    date -- the date string
    """
    return re.match('([0-9]){1,2}((\/)([0-9]){1,2}){0,1}((\/)([0-9]){4}){0,1}', date)