I also told you that the string '0.00' is only FOUR characters, and you were taking a substring of FIVE characters.

Your code is written in a rather confusing manner. You've got code in loops that shouldn't be there. What you want to do is keep all the lines until you find one that matches your criteria, and then print the lines you've kept and all the lines following it. Here is a sample solution:

# print all lines from 'START' to 'STOP'
# if a line in between them has 'foobar' at position 10
my $target = 'foobar';
my $pos = 10;
my (@buffer, $found);

while (<FILE>) {
  if (/START/ .. /STOP/) {

    # if we have already found our target string, print this line
    if ($found) { print }

    # otherwise...
    else {
      # store this line in our buffer
      push @buffer, $_;

      # and if we find the target string at the right location
      # set $found to 1, and print the buffer
      if (substr($_, $pos, length($target)) eq $target) {
        $found = 1;
        print @buffer;
      }
    }
  }
}
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