Oh, and you can declare your variable in loop. No need for my $file = $_ later:
sub by_id {
# extract numbers
my ($A) = $a =~ /(\d+)/;
my ($B) = $b =~ /(\d+)/;
# return comparison
return $A <=> $B;
}
for my $f (sort by_id @files) {
say $f;
}
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