Thank you a lot. Now I finally understand it. My problem was always that I did not take the container elements (in this example "wife" and "kids") into account. So DumpTree did not recurse.

The same solution with positive logic would then be:

return('HASH', undef, grep { /^name|kids|wife$/} keys %$s) ;

And of course you are right. I should describe what exactly did not work if I use a non-standard module.

In reply to Re^4: Help to understand the Data::TreeDumper Filters by Dirk80
in thread Help to understand the Data::TreeDumper Filters by Dirk80

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