Why not just do it this way? 
open OUTFILE, "<$outfile";
my @OUT = <OUTFILE>;
open FINAL, ">$final";
my $line;
 foreach $line(@OUT) {
    if ($line=~/(my first line)<br>/) {print FINAL "$1\n"}
    if ($line=~/(my second line)<br>/) {print FINAL "$1\n\n"}
    if ($line=~/(my third line)<br>/) {print FINAL "$1\n"}
}

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Blessings,

~Polyglot~

In reply to Re: simple question on next line parameter by Polyglot
in thread simple question on next line parameter by yskmonk

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