I would do it on line basis (using the .. flip flop operator): 
.
.
.
my $firsttime = 1;
while(<IN>){
  if(/Final graph set matrix/ .. /PLUTO4 finished/){
    if($firstime--){
      print "\nnew data set\n";
    }
    my @gset_match = ($string =~ ([A-Z]\s\d+,\s\d+\(\s*\d+\))/g);
    foreach $_(@gset_match) { print TEXT "$_\n"; }
  }
}
.
.
.

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I feel there should be some more elegant way to print the delimiters, but can't figure it out.

In reply to Re: pattern matching between two specific strings by zby
in thread pattern matching between two specific strings by harry34

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