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  1. or download this
    my @res = grep { !/$tmp/ } @array;
  2. or download this
    use 5.020;
use Data::Dumper;
...

say Dumper \@positive; # 'rerere'
say Dumper \@negative; # 'rerere', 'foo'
  3. or download this
    use 5.020;
use Data::Dumper;
...
say Dumper \@positive; # 'rerere'
say Dumper \@negative; # 'foo'