If I understand this correctly, you have a file with multi-line records terminated by '//\n'. Like this?

1
2
3//
foo
bar
baz//
[download]

Then when you change $/ to your record separator, the diamond operator will give you a whole record. And now you need the individual lines within each? I'd say just split on /\n/, but I have a feeling that's not exactly what you wanted. Can you clarify?