Perl Regex To Condense Multiple Line Breaks

Question

I can\'t seem to figure out the right syntax but I want a Perl regular expression to find where there are two or more line breaks in a row and condense them into just 2 line

Answer 1

Show a full example. What is $string?

$ perl -E'my $s = qq{a\n\n\nb}; say "[$s]"; $s =~ s/\n\n+/\n\n/g; say "[$s]"'
[a


b]
[a

b]