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my $price = "100.09";

...
} elsif {
  die "'$price' dosen't look like a valid price.\n"
};

  /^([0-9]+(\.[0-9]{2})?)|(\.[0-9]{2})$/

perl -MHTTP::Daemon -MHTTP::Response -MLWP::Simple -e ' ;    # The  
$d = new HTTP::Daemon and fork and getprint $d->url and exit;#spider
($c = $d->accept())->get_request(); $c->send_response( new   #in the
HTTP::Response(200,$_,$_,qq(Just another Perl hacker\n))); ' #  web