use strict;
use warnings;

my @hand3 = qw/KsQs JsAs/;
my @hand4 = qw/AsKc 2s3s/;
my @hand899 = qw/As3c/;

my @theirHands = (\@hand3, \@hand4, \@hand899);
my $myHand = "AcAs";
my %myCards = map {$_ => 0} $myHand =~ /(.{2})/g;
print "My hand: ", join '', keys %myCards, "\n";

for my $hands (@theirHands) {
    # If any of my cards match an opposing hands' card, reject the opp
+osing hand
    my @retained;

    for my $hand (@$hands) {
        next if grep {exists $myCards{$_}} $hand =~ /(.{2})/g;
        push @retained, $hand;
    }

    print "@retained\n";
}