foreach my $browser ( values %{$data->{devices}->{device}} ) {
  my $useragent = lc($browser->{user_agent});
  my $userfb = lc($browser->{fall_back});
  print Dumper(\$useragent, \$userfb, \$user);  
}

##</code><code>##

#!/usr/bin/perl -w
use strict;

print "Content-type: text/html\n\n"; 

# use module
use XML::Simple;
use Data::Dumper;
use LWP::Simple;

my $url = 'http://wurfl.sourceforge.net/web_browsers_patch.xml';
my $user = $ENV{'HTTP_USER_AGENT'};
$user = lc($user);

my $content = get($url);

# create object
my $xml = new XML::Simple;

# read XML file
my $data = $xml->XMLin($content);

# print output
my @agents;
my $check;

foreach my $browser ( values %{$data->{devices}->{device}} ) {
  my $useragent = lc($browser->{user_agent});
  my $userfb = lc($browser->{fall_back});
  $user =~ /$useragent/;
  print Dumper(\$useragent, \$userfb, \$user);  
}