Hi. Thanks for the code, but it has an awful lot of syntax errors in it. Here is the corrected version:

foreach my $input ( @inputs ) {
    my @pieces = split /\s+\/\s+/, $input;
    my $level  = scalar @pieces;

    my $new_node = { name => $pieces[-1], level => $level };

    if ( $level == $stack[-1]->{level} ) {
        pop @stack;
    }
    elsif ( $level < $stack[-1]->{level} ) {
        pop @stack while ( $level <= $stack[-1]->{level} );
    }
    # else top level must be our parent
    push @{ $stack[-1]->{children} }, $new_node;

    push @stack, $new_node;
}
[download]

Anyways ... this works like a charm. Thanks a lot. :)