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c:\@Work\Perl\monks>perl -MO=Deparse,-p -i -lpe "s/^\s*$/<r><\/r>/g"
BEGIN { $^I = ""; }
...
    print($_);
}
-e syntax OK

    use constant BLANK_LINE   => qr{ \A \s* \z }xms;
    use constant EMPTY_R_PAIR => "<r></r>\n";
    ...
    $out = EMPTY_R_PAIR if $out =~ BLANK_LINE;