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  1. or download this
     unless (($key =~ /(?:^,)|,,|[^a-zA-Z,]|(?:,$)))
  2. or download this
     if (($key =~ /^[a-zA-Z]+(?:,[a-zA-Z]+)*$))
  3. or download this
     my $field = qr([a-zA-Z]+);
 if (($key =~ /^$field(?:,$field)*$))