how to change every 3rd character

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# 1  
Old 12-15-2007
how to change every 3rd character

hey champs,

i have a files, whose contents are as follows,


i want to replace every other 3rd character to some specified character.
let here in this file i want to replace each 3rd character to z.


so can anybody let me know how to achieve it ????
# 2  
Old 12-15-2007
sed 's/\(..\)\(.\)\(.*\)/\1z\3/g' pattern
I think there exist simpler method
# 3  
Old 12-15-2007
I think the OP wants this:

sed 's/\(..\)\(.\)/\1z/g' data

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