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use URI::Escape qw(uri_escape);
sub {
...
    return show_err("Incomplete node link?");
  }
}

sub ret_link_by_id {
  my $tracking = shift; # eg "&lastnode_id=23453"
...
    }
  }
}

sub {
  my $t_ref = shift;
...
    return encode_entities($1);
  }
}

You can link by URL like this:
<pre>
  \<a href="http://www.perlmonks.org/"\><a href=http://www.perlmonks.o
+rg/>Perl Monks</a>\</a\>
</pre>