my @arr;
while (<FILE>) {
  push @arr, $1 if /^\$FILES(.*?)\$$/;
}
[download]

Check juo's example, there will be more data after the $ so you'll need to leave of the second $ (as davorg did) or it won't match.

open DATA, "junk.txt" or die $!;
my @arr;
while (<DATA>) {
  # add the extra $ and it won't print anything
  push @arr, $1 if /\$FILES(.*?)\$/;
}
close DATA;

print $_, "\n" for @arr;
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Try it out.

Update: I think I misinterpreted Chief of Chaos's post. If you want to ensure there's no data before the $FILE or after the $ then he is correct.

Update: If you want each CSV as an individual array element, substitute the push line above with:

push @arr, split(/, /, $1) if /\$FILES(.*?)\$/;

Otherwise they'll all read into one element.

The problem is that it assumes that everything is on one line while the text is on multiple lines so it has to keep putting it in the array unless the line contains the $. I have tried to use while in the while loop but it gets out of memory. Is their an easy way when a line is found to keep adding the lines in the array untill something else is found in a next line.