Check if the event_tag matches the search check.
        Uses regular expression search to check.
        Return True (matches) or False (no match)

def _match_tag_regex(self, event_tag, search_tag):
        '''
        Check if the event_tag matches the search check.
        Uses regular expression search to check.
        Return True (matches) or False (no match)
        '''
        return self.cache_regex.get(search_tag).search(event_tag) is not None