How to combine lines within range of pattern

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# 8  
Old 09-07-2009
local $/="";
my $str=<DATA>;
$str=~s/\n(?=([^\(\n]*\n*)*\))/ /g;
print $str;
line 1
line 2
line 3
line 4
line 5)
line 6
line 7
line 8
line 9

# 9  
Old 09-07-2009
If you have your heart set on doing it in sed:

sed '
/(NP/ {
s/\n/ /
/)$/ !b loop
' file

I've always had problems using "\n" on the left side of "s" commands, but if it's embedded in the pattern space it seems to work. Go figure.
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