@base.resource(CalendarEvent)
    def calendar_event(self, calendar_event_id):
        return CalendarEvent(self, calendar_event_id)
Helper initialiser method to create the regular-expression pattern to
dataset/ETHPy150Open ducksboard/libsaas/libsaas/services/basecamp/calendars.py/Calendar.calendar_event--crossover with--dataset/ETHPy150Open daviddrysdale/python-phonenumbers/python/phonenumbers/phonenumberutil.py/_create_extn_pattern