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

my @forbidden = qw (
                    master
                    model
                    dbccdb
                    sybsecurity
                    sybsystemdb
                    sybsystemprocs
                    tempdb
                    DBA
                    );

my %forbidden = map{lc $_ => 1}@forbidden; 
# or could just build the hash manually

while ( (print "Enter DB name: "), 
        (my $name = <STDIN>) !~ /^\s*q(uit)?\s*$/i  
      )
{
     $name =~ s/^\s+//;
     $name =~ s/\s+$//;  #also does chomp
     
     next if ($name =~ /^\s*$/); #simple re-prompt if blank line
     
     if ($name =~ / /)  
     {
         print "Error no spaces within name allowed!\n";
         next; 
     }
   
     if ( $forbidden{lc $name}  )
     {
        print "Error: $name is a reserved name!\n";
        next;
     }
     
     if ( $name =~ /\W/)  # only a-zA-Z0-9_ allowed
     {
        print "Error: illegal character in name!\n";
        next;     
     }
     
     #... perhaps more tests on the input name?
     
     print "Ok, $name is valid\n";
}