How to replace multiple strings in a txt file and keep the original format

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Ferial Assmani
Ferial Assmani 2013-3-24
Hi all, my problem is how to replace multiple strings in a txt file and keep its original format; the original file is
Section = 1
*Lookhere
10
Dont Lookhere
Section = 2
*Lookhere
20
Dont Lookhere
the post changed file is
Section = 1
*Lookhere
1000
Dont Lookhere
Section = 2
*Lookhere
2000
Dont Lookhere
So i must localize the n (* Lookhere) argument and i read the n numbers just after this argument and i store them in a vector to change them via a function (*100 for example) and i re write the file with the same original format
Tanks at advance

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