Dynamically wrapping multiple modules

[BigLug]

I have a module that takes a list of country codes in its constructor. Each of these codes could (should) be another module that just contains a hash (%MyModule::AU::Hash, %MyModule::FR::Hash etc). I have several questions:

1. Is there a 'best' or simple way to load all the modules? I figure an evaled require in a loop. However I don't want to eval user input. Can anyone suggest a better way to do it?

foreach my $cc (@country_code) {
   eval( "require MyModule::$cc" );
   croak("Unable to locate MyModule::$cc") if $@;
}

2. Once they're loaded, how should I access them? At several points in my code I want to use the hash. One thought was to use eval to import the hash at load time, however I'm still sending user input to eval!:

foreach my $cc (@country_code) {
   eval( "require MyModule::$cc" );
   croak("Unable to locate MyModule::$cc") if $@;
   push( @{$self->{data}}, { eval( "\%MyModule::$cc::Hash" ) } );
}

However I'd prefer not to import it all if I can. I'd prefer to store a reference to the hash in my object or even to grab the data as needed. But I don't want to fill my module with eval()s Thoughts and comments welcome.

Update: I can't validate the user input with known values. However I can validate it using a regex: croak if $cc !~ /^[a-z]{2}$/i