Re: Hash/Array slice : how to exclude items?

[johngg]

Somewhat messy but you could grep a negated regex in a hash slice.

johngg@aleatico:~$ perl -Mstrict -Mwarnings -MData::Dumper -E 'say q{}
+;
my %hash = ( qw{ a 1 b 2 c 3 d 4 e 5 f 6 } );
print Data::Dumper->Dumpxs( [ \ %hash ], [ qw{ *hash } ] );

my @excl = qw{ b f };
my $rxExcl = do {
   local $" = q{|};
   qr{^@excl$};
   };

print Data::Dumper->Dumpxs(
   [ [ @hash{ @{ [ grep { ! m{$rxExcl} } keys %hash ] } } ] ],
   [ qw{ *slice } ]
   );'

%hash = (
          'd' => '4',
          'b' => '2',
          'a' => '1',
          'c' => '3',
          'e' => '5',
          'f' => '6'
        );
@slice = (
          '4',
          '1',
          '3',
          '5'
        );

I hope this is of interest.

Update: I renamed the second Data::Dumper->Dumpxs() output from @hash to @slice to better reflect what was going on.