Break up the elements and sort on the two fragments:
#!/usr/bin/perl
use strict;
use warnings;
use Data::Dumper 'Dumper';
my @files = qw(firstcase_1 firstcase_2 firstcase_10 secondcase_4 secon
+dcase_1 secondcase_11);
my @sorted = sort { $a =~ /^(\w+)_(\d+)$/; my ($a1,$a2) = ($1,$2);
$b =~ /^(\w+)_(\d+)$/; my ($b1,$b2) = ($1,$2);
$a1 cmp $b1 || $a2 <=> $b2 }
@files;
print Dumper(\@sorted);
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