\1 can capture much more than a single character, so, it can't be used inside a character class because it doesn't represent a character, but a string
It's not a problem, see perlretut
/[\]c]def/; # matches ']def' or 'cdef'
$x = 'bcr';
/[$x]at/; # matches 'bat', 'cat', or 'rat'
/[\$x]at/; # matches '$at' or 'xat'
/[\\$x]at/; # matches '\at', 'bat, 'cat', or 'rat'
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