http://www.perlmonks.org?node_id=413152


in reply to Arrays and Hashes Mapping

If I understand you correctly, perhaps something like this: 

@list = ('one' , 'two' , 'three');
%hash = ( one => 1 , two => 2 , three => 3 );

@list = grep { !$hash{$_} } @list;

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