my $valid = 0;
my $state;
my $firstAttempt = 1;
while(!$valid){
        if($firstAttempt) {
             $state = promptUser("What network to listen for SNMP traps [hsbn or admin]? ", "admin"); ;
                                $firstAttempt = 0;
                        }
                        else {
                                $state = promptUser("ERROR:$state Invalid Re-enter the network");
                        }
                        if($state =~ /hsbn|admin/) {
                                $valid = 1;
                        }
                }

                
                if ($state =~ /hsbn/i) {
                    //some action
                }