#!/usr/bin/perl

# http://perlmonks.org/?node_id=1137428

use strict;
use warnings;

open (my $rangeFixed, '<', "rangeFile.txt") or die "Cannot Open File: 
+rangeFile.txt $!";
$_ = join '', <$rangeFixed>;

s/^(IMB,\d+,V1\s,)(\d+),\K
  (?:.*\n)+
  \1\d+,(\d+).*/$3/gmx;

open (my $rangeOutput, '>', "test.txt") or die "Cannot Open File: test
+.txt: $!";
print $rangeOutput $_;
close $rangeOutput;
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It didn't work. The output was all the lines, it didn't combine them?