I'm not sure. I remember [a-z] depending on locale, but it was probably in bash rather than Perl...
$ (LC_ALL=en_US.UTF-8; [[ é =~ [a-z] ]] || echo no)
$ (LC_ALL=C; [[ é =~ [a-z] ]] || echo no)
no
$ perl -Mutf8 -wE 'say "é" =~ /[[:lower:]]/'
1
$ perl -Mutf8 -wE 'say "é" =~ /[a-z]/'
$
Update: Switched from <c> to <pre> and back.
map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]
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