thanks for your reply. I'm a bit puzzled with the regex. 
      ((defined($_->[0]) && $_->[0] =~ m/^\d+$/) ? $_->[0] : 0)

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Am I correct if I assume that here $_ is defined as 'one single digit or maybe a few digits (d+, no spaces and stuff like that in between the digits) and then if this is not the case it should be a 0 (zero)? Never used this ternary operator and just want to make sure that's what it is.
thanks

In reply to Re^2: Data::Table - empty values - avoid warnings by GertMT
in thread Data::Table - empty values - avoid warnings by GertMT

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