def _update_regex(self):
        self._regex = re.compile("|".join(map(self._wordToRegex, self.keys())))
        self._regexIsDirty = False
Calculate recommended links for new users, who never had a recommended calculation done.
dataset/ETHPy150Open encorehu/django-buddy/core/aiml/WordSub.py/WordSub._update_regex--crossover with--dataset/ETHPy150Open agiliq/django-socialnews/socialnews/news/cron.py/calculate_recommendeds_first