Yet another (short) way:

my ( $str1, $str2 )  = ( 'ABCDE', 'BCDEO' );

my %count;
$count{$_}++ for split //, $str1.$str2;

print grep $count{$_} == 1, keys %count;

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In reply to Re: compare two strings and return only he unique values. by Not_a_Number
in thread compare two strings and return only he unique values. by Learnlot1

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