What you're seeing is a perl -e " ... code ... " Windose command line padded out with spaces to emulate the appearance of multi-line source. The code comes from the Windoze clipboard. The original intent was to quickly cut/paste, possibly modify, and test posted code snippets, so I decided to eliminate blank lines. If I want to have something that looks like a blank line, "something" has to be there, and by convention, I use ;; as that something.
By the same token, because what's after the -e switch is just a single string/line, any # comment-to-end-of-line just clobbers the entire remainder of the line, even though the remainder appears multi-line. So, no comments.
Give a man a fish: <%-{-{-{-<
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