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---
w: bar
...
w:
  - bar
  - bar

'foo' =~ /(?<w>\w+)/ && 'foofoo' =~ /\g{w}\g{w}/;

'oo' =~ /(?<w>\w+)/ && 'oo' =~ /\g{w}\g{w}/;

%+ = ( w => 'oo');
%- = ( w => ['oo']);

'oo' =~ /(?<w>\w+)/ && 'oo' =~ /(?<w>\g{w}\g{w})/;  # Which I *think* 
+is possible!

%+ = ( w => undef);  # or not existing at all? I'm half hearted...
%- = ( w => []);