use Data::Dumper;

my %hash = (
    apple  => 'red',
    orange => 'orange',
    banana => 'yellow',
);
my $old_key = 'orange';
my $new_key = 'carrot';

$hash{$new_key} = delete $hash{$old_key};

print Dumper(\%hash);

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In reply to Re^2: Hash substitution by Narveson
in thread Hash substitution by weezer_316

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