r'[\x20-\x21,\x23-\x5B,\x5D-\xFF]+

def t_string_UNESCAPED(self, t):
        r'[\x20-\x21,\x23-\x5B,\x5D-\xFF]+'
        t.value = t.value if isinstance(t.value, unicode) else unicode(t.value, encoding='utf8')
        return t