problems with code in "Writing Apache Modules with Perl and C"

[Sam Carleton]

I am new to perl and am trying to figure out how to get the navbar code
to work in the book "Writing Apache Modules with Perl and C".  I have
trace it all the way down to the object that reads in the navbar config
file:

sub new {
    my ($class,$conf_file, $r) = @_;
    my (@c,%c);
    my $fh = Apache::File->new($conf_file) || return;
    while (<$fh>) {
        chomp;
        s/^\s+//; s/\s+$//;   #fold leading and trailing whitespace
        next if /^#/ || /^$/; # skip comments and empty lines
        next unless my($url, $label) = /^(\S+)\s+(.+)/;
        push @c, $url;     # keep the url in an ordered array
        $c{$url} = $label; # keep its label in a hash
        $r->log_error("url = [$url], label = [$label]");
    }
    return bless {'urls' => \@c,
                  'labels' => \%c,
                  'modified' => (stat $conf_file)[9]}, $class;
}

What I would like to do is do a $r->log_error() right after "my($url,
$label) = /^(\S+)\s+(.+)/;", but that is at the end of a "next unless" 
The bottom line is I would like to modify this code as to allow me to
see each line of the file I am reading in and to see what is being put
into the $url and $lable.  Can someone help me out?

Sam