def choose_tag(self: object, tokens: List[str], index: int, history: List[str]):
        """Use regular expressions for rules-based lemmatizing based on word endings;
        tokens are matched for patterns with the base kept as a group; an word ending
        replacement is added to the (base) group.
        :rtype: str
        :type tokens: list
        :param tokens: List of tokens to be lemmatized
        :type index: int
        :param index: Int with current token
        :type history: list
        :param history: List with tokens that have already been lemmatized; NOT USED
        """
        for pattern, replace in self._regexs:
            if re.search(pattern, tokens[index]):
                if self.default:
                    return self.default
                else:
                    return replace