though in sacked's original example there was no do block.

Well, of course there wasn't a do block, because he was showing a foreach loop, and was asking how to do the equivalent using map. You don't need to do {} in the foreach.

But sacked's original example didn't contain multiple nexts. There's also another way of dealing with this problem: a bare block:

my @paragraph = map {;{
    next if /^#/;
    $_ = lc $_;
    $_ =~ tr/ -~//cd;
    next if /foobar/;
    $_ =~ s/administration/admin/g;
    next if length $_ > 60;
    $_
}} @lines;
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Abigail