join("", @array[map {rand @array}(1..n)]);

##</code><code>##

#!/usr/bin/perl
use strict;
use warnings;

my @chars = ( "a" .. "k", "m","n", "p" .. "z");
my @upchars = ("A".."N","P..Z");
my @nona = qw(! @ $ % & ( ) + = { } [ ] < > ~);
my @nums = (0 .. 9);
my $lc = \@chars;
my $uc = \@upchars;
my $na = \@nona;
my $nu = \@nums;
my @types=($lc, $uc, $na, $nu);
my $a = join("", $types[3][ map { rand \$types[3] } ( 1 .. 4 ) ]);
$a .= join("", $types[2][ map { rand \$types[2] } ( 1 .. 4 ) ]);
$a .= join("", $types[1][ map { rand \$types[1] } ( 1 .. 4 ) ]);
$a .= join("", $types[0][ map { rand \$types[0] } ( 1 .. 4 ) ]);
print "My selection is $a \n";
exit;

##</code><code>##

my $a = join("", $types[0][ map { rand \$types[0] } ( 1 .. 4 ) ]);
$a .= join("", $types[1][ map { rand \$types[1] } ( 1 .. 4 ) ]);
$a .= join("", $types[2][ map { rand \$types[2] } ( 1 .. 4 ) ]);
$a .= join("", $types[3][ map { rand \$types[3] } ( 1 .. 4 ) ]);