..I only need to print those unmatched data shown as expected result..
use negation not like so: 
...
while (<DATA1>) {
    next if /^\s*$/;
    if (/^.+?\s(.+?)\s/) {
        print $_ if not exists $hash{$1}; # note HERE
    }
}
..

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Could you please explain further about hash?
See perlintro
If you tell me, I'll forget.
If you show me, I'll remember.
if you involve me, I'll understand.
--- Author unknown to me

In reply to Re^3: Perl: How to print unmatched data after comparison of two files? by 2teez
in thread Perl: How to print unmatched data after comparison of two files? by WWq

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