# Map keys to coderefs (used sort of like a switch statement)
my %ActionMap =
  (post => sub{
     $allowed{msgid} = '^(\d+|new)$';
     $allowed{data}  = '^(([^|+]*[^|]+.*\|){4}[^|+]*[^|]+.*)$';
   },
   edit => sub{
     $allowed{msgid} = '^(\d+|new)$';
   },
   delete => sub{
     $allowed{msgid} = '^(\d+)$';
   },
   long => sub{
     $allowed{sort}  = '^(author|date|subject|expire)$';
     $allowed{msgid} = '^(\d*|all)$';
   },
   short => sub{
     $allowed{sort}  = '^(author|date|subject|expire)$';
     $allowed{msgid} = '^(\d+|all)$';
   });
# "Call" the coderef matching the "switch" value
$ActionMap{$query->{action}}->();

for my $key (keys %$query){
  return 0 unless exists $allowed{$key} && $query->{$key} =~ /$allowed{$key}/;
}