Hi, you don't show your desired output, but as the doc for Sort::Key::Natural says:
Note, that the sorting is case sensitive. To do a case insensitive sort you have to convert the keys explicitly
Use natkeysort() instead:
use Sort::Key::Natural qw( natkeysort );
my @list = qw(P007b_Yum P007_Yum P007B_YUM P007_YUM P007b_yum P007_yum
+);
say for natkeysort { lc $_ } @list;
$ perl 1202470.pl
P007b_Yum
P007B_YUM
P007b_yum
P007_Yum
P007_YUM
P007_yum
Hope this helps!
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