import re


def is_end_of_period(date):
    """Returns True if the given date 'mm/dd' is the end of a pay period,
       False otherwise"""
    date_list = re.split('\\W', date)
    month = int(date_list[0])
    day = int(date_list[1])
    if day == 15:
        return True
    days_per_month = [-1, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
    if day == days_per_month[month]:
        return True
    return False