Make sure you get the length of the array element before you modify it and accumulate the byte count afterwards.

$ perl -Mstrict -Mwarnings -E '
my @array = (
   q{Hello, my name is John},
   q{How are you?},
   q{blah (blah)},
   );
my $byteCt = 0;
do {
   my $len = length;
   s{^}{ sprintf q{%08d }, $byteCt }e;
   $byteCt += $len;
   } for @array;
say for @array;'
00000000 Hello, my name is John
00000022 How are you?
00000034 blah (blah)
$

[download]

I hope this is helpful.

Cheers,

JohnGG

In reply to Re: Calculating/adding byte counts of array elements by johngg
in thread Calculating/adding byte counts of array elements by Dr Manhattan

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