import re


def parse_month_year(date_string):
    """
    >>> parse_month_year('01/10/2012')
    (10, 2012)
    """
    match = re.match('\d{2}/(?P<month>\d{2})/(?P<year>\d{4})$',
                     date_string.lower())
    if not match:
        raise ValueError("Not format 'dd/mm/yyyy': '{}'".format(date_string))
    month = int(match.group('month'))
    year = int(match.group('year'))
    return month, year