Perhaps something as simple as this: 
my $name = "file000";
open STDOUT, ">>file000" or die "cannot append to file000: $!";
while (<>) {
  if (/Experiment/) {
    open STDOUT, ">>".(++$name) or die "Cannot append to $name: $!";
  }
  print;
  if (/Reagent Lot/) {
    open STDOUT, ">>file000" or die "Cannot re-append to file000: $!";
  }
}

[download]
This puts each new section into file001, file002, file003, and so on, and anything outside those sections into file000.

Will that do, or are there other secret requirements? {grin}

-- Randal L. Schwartz, Perl hacker

Update: oops, I had an off-by-one error, and it's fixed now. Maybe I need to read up on pre-increment vs post-increment again. {grin}

In reply to Re: matching and writing multiple line blocks by merlyn
in thread matching and writing multiple line blocks by MadraghRua

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