are supported. The results of using any other character, other
than an octal digit, following the backslash are unspecified.
_cccc_----_cccc Represents the range of collating elements between the range
endpoints, inclusive, as defined by the current setting of the
LC_COLLATE locale category. The starting endpoint must precede
the second endpoint in the current collation order. The
characters or collating elements in the range are placed in the
array in ascending collation sequence.
_[[[[_::::_cccc_llll_aaaa_ssss_ssss_::::_]]]]
Represents all characters belonging to the defined character
class, as defined by the current setting of the LC_CTYPE locale
category. The following character class names will be accepted
when specified in _s_t_r_i_n_g_1: _aaaa_llll_nnnn_uuuu_mmmm_,,,, _aaaa_llll_pppp_hhhh_aaaa_,,,, _bbbb_llll_aaaa_nnnn_kkkk_,,,, _cccc_nnnn_tttt_rrrr_llll_,,,, _dddd_iiii_gggg_iiii_tttt_,,,,