Hello again!

I have taken a look at the files and suggestions posted to my previous thread and here is what I made. However it returns a syntax error at line 14 and I can not see why. Does anyone have a suggestion as to why it is returning a syntax error?

#!/usr/bin/perl -w
use strict;
use diagnostics;
my $file = "$ARGV[0]";
open (DAT, $file) || die("Can not open file!");
while (<DAT>) {
        my $seq = $_;
    if($seq =~m/^[ATCG]+$/){
        my $DNA = '';
        $DNA = $seq;
        my $revcom = reverse($DNA);
        $revcom =~ tr/ACGTacgt/TGCAtgca/;
        print $revcom;
        };

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In reply to Isolating DNA cont. by undergradguy

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