Or, using pos() and \G

$ perl -le'
$_ = q/atcgcgtacatcgatac/;
print;
pos = 8;
s/\G(.)/\u$1/;
print;
'
atcgcgtacatcgatac
atcgcgtaCatcgatac

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In reply to Re^2: String character replacement based on position by deibyz
in thread String character replacement based on position by shu_uemura

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