Removes controls chars from text
    
        :return: input except controls chars

def remove_control_chars(self):
        """Removes controls chars from text
    
        :return: input except controls chars
        """
        esc_key = Literal('\x1b')
        integer = Word(nums)
        escape_seq = Combine(
            esc_key + '[' + Optional(delimitedList(integer, ';')) +
            oneOf(list(alphas)))

        return Suppress(escape_seq).transformString(self.string)