FYI
the /s flag only matters if you have '.' in your regex.
So, /\n\n/ will work just as good as /\n\n/s
From perlre

...

s   Treat string as single line. That is, change "." to
    match any character whatsoever, even a newline, which 
    normally it would not match.

...
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--perlplexer