This is line is causing it: substr($FirstLine, -1, 1) = $DataLine. As someone already mentioned, you should really just use the regex on the returned value from substr() (Perl is magic like that). Or, you could do $FirstLine .= $DataLine to append one string to the end of another.
Jeff japhy Pinyan, P.L., P.M., P.O.D, X.S.: Perl, regex, and perl hacker
How can we ever be the sold short or the cheated, we who for every service have long ago been overpaid? ~~ Meister Eckhart

In reply to Re: Lost Column by japhy
in thread Lost Column by wrml

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