Does: 
perl -lne 'next if /.{188}00000000.{16}/; $d='20020101'; s/(.{188})\d{
+8}(.{16})/$1$d$2/; print' original.txt > new.txt

[download]
do what you need?

In reply to Re: search and replace on a line by line basis by gsiems
in thread search and replace on a line by line basis by Anonymous Monk

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