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while (<>) {
next if $_ =~ m/\n{1}/;
if ($_ =~ m/\n{2}){s/\n{2}/\n/gs}
elsif ($_ =~ m/\n{3,}){s/\n{3,}/\n\s/gs}
}

while (<>) {
     if ($_ =~ m/\n{1}/) {
...
          print;
     }
}

while (<>) {
     if ($_ =~ m/\S\n{2}\S/){
...
          print;
     }
}