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  1. or download this
    my %+;
my %-;
...
print Dump \%+;
print Dump \%-;
__END__
  2. or download this
    'foo' =~ /(?<w>\w+)/ && 'foofoo' =~ /\g{w}\g{w}/;
  3. or download this
    'oo' =~ /(?<w>\w+)/ && 'oo' =~ /\g{w}\g{w}/;