def _handle_posix(self, i, result, end_range):
        """Handle posix classes."""

        last_posix = False
        m = i.match(RE_POSIX)
        if m:
            last_posix = True
            # Cannot do range with posix class
            # so escape last `-` if we think this
            # is the end of a range.
            if end_range and i.index - 1 >= end_range:
                result[-1] = '\\' + result[-1]
            posix_type = uniprops.POSIX_BYTES if self.is_bytes else uniprops.POSIX
            result.append(uniprops.get_posix_property(m.group(1), posix_type))
        return last_posix
Handle posix classes.