my $Configure =
    {
      ...
      #  field to search in (if not 'show' whole index),
      , 'find'  => [ 'name'
                   #  regex to be compiled
                   , join '|' , qw(show any) , ${$Fields{'keep'}}
                   ]
    };

$Configure->{'find'}->[1] = qr/^ $Configure->{'find'}->[1] /xi;