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in reply to Re^2: extracting only those keys with uniq values in array list
in thread extracting only those keys with uniq values in array list

Thanks for the clarification. Build the hash exactly as you show. Process the keys with grep
use strict; use warnings; my %r_name = ( a => [ 1, 2 ], b => [ 3, 3 ], c => [ 1, 6 ], ); my @result = grep {$r_name{$_}[0] eq $r_name{$_}[1]} keys %r_name; print @result, "\n";

Result

b

Note for next time: It is considered impolite to edit your post in a way that invalidates existing replies. Leave the existing text. Add a clearly marked UPDATE section.

Bill