I'd rewrite the sub as:
sub files_sort {
my $re = qr/(\d+)_\d+_duration_\w+_comptage_\d+.txt$/;
my $first_number = $a =~ $re ? $1 : -1;
my $second_number = $b =~ $re ? $1 : -1;
return $first_number <=> $second_number;
}
which is slightly more compact and deals better with bad matches by avoiding comparing undefined values. Explicit returns are good too.
Perl is environmentally friendly - it saves trees
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