Check if a string is in the DB.

        :param s: str, string to check against the DB.
        :param instant_exact: bool, look up exact matches with a hash lookup.
        :return: True or False
        :rtype: bool

def check(self, s, instant_exact=True):
        """Check if a string is in the DB.

        :param s: str, string to check against the DB.
        :param instant_exact: bool, look up exact matches with a hash lookup.
        :return: True or False
        :rtype: bool

        """
        all_sets = self._get_comparison_strings(s)
        if instant_exact and s in all_sets:  # exact match
            return True

        for comparison_string in all_sets:
            if self.comparison_func(s, comparison_string) >= self.cutoff:
                return True
        return False