Being a "Perl Best Practices" lemming, I think I'd end up with something like this:

#!/usr/bin/perl

use strict;
use warnings;
use IO::Prompt;
use Switch 'Perl6';

my $hsbnNet  = 'h|hs|hsb|hsbn';
my $adminNet = 'a|ad|adm|admi|admin';

my $prompt = "What network to listen for SNMP traps [hsbn or admin]? "
+;

my $response = 
   prompt( $prompt,
           -require => {
              "Must select either hsbn or admin.\n$prompt" =>
                 qr/^(?:$hsbnNet)$|^(?:$adminNet)$/i } );

given ( "$response" ) {
   when /$hsbnNet/  { ListenOnHsbn(); }
   when /$adminNet/ { ListenOnAdmin(); }
}

sub ListenOnHsbn {
   print "Listening on hsbn Net\n";
}

sub ListenOnAdmin {
   print "Listening on Admin Net\n";
}
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