I know this is a very old post, but in case anyone arrives here via Google, I wanted to note that this tutorial is misguided. There's absolutely no reason whatsoever to use XML::Parser, and the code above is needlessly complex. There's also about three times as much code as you need for something this simple. So why not use XML::Simple? It's pretty straightforward:
use warnings;
use strict;
use XML::Simple;
# Just an example. You'd use LWP to get the actual CB.
my $xml = '<CHATTER><INFO site="http://perlmonks.org" sitename="Perl M
+onks">Rendered by the Chatterbox XML Ticker</INFO>
<message author="OeufMayo" time="20010228112952">test</message>
<message author="deprecated" time="20010228113142">pong</message>
<message author="OeufMayo" time="20010228113153">/me test again; :
+)</message>
<message author="OeufMayo" time="20010228113255"><a href="#">
+;please note the use of HTML tags</a></message></CHATTER>';
my $ref = XMLin($xml);
foreach my $msg (@{$ref->{'message'}}) {
my $h = substr($msg->{'time'}, 8, 2);
my $n = substr($msg->{'time'}, 10, 2);
my $author = $msg->{'content'} =~ s/^\/me// ? $msg->{'author'} : "<$
+msg->{'author'}>";
print "$h:$n $author: $msg->{'content'}\n";
}
Now you have a complete a simple parser. And no dodgy regexes, either.