def _clear(self, storage, regex):
        r = re.compile(regex)
        for (key, value) in storage.items():
            if r.match(str(key)):
                del storage[key]
Auxiliary function called by `clear` to search and clear cache entries
dataset/ETHPy150Open uwdata/termite-visualizations/web2py/gluon/cache.py/CacheAbstract._clear