I did get a warning when trying to run your script, but replacing
my @fields = split(/\Q|\E/gm, $line); with
my @fields = split(/\Q|\E/, $line); took care of that. I don't see where that change would be the cause of the problem you describe.
Otherwise, as far as I can tell, you're script works as you think it should. However I was running it off the command line, which leads me to think that the problem lies somewhere in your html, or in the data that you're sending to the script. You might not only try chomping that data, but also using a regex to filter out anything except letters, numbers, and whitespace.
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