Unrelated to your question, dots are literal on the right side of s///; no need to escape them: 

#$outfile =~ s/\.txt/\.tag\.txt/gi;
 $outfile =~ s/\.txt/.tag.txt/gi;

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In reply to Re: Printing ten characters succeeding a matching string by hbm
in thread Printing ten characters succeeding a matching string by bluray

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