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Find and replace txt between two strings in flat file

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# 1  
Old 07-15-2011
Find and replace txt between two strings in flat file
Hi There...
I need to serach and replace strngs in a text file.
My file has;
books.amazon='Let me read'
news.bestseller='xyz'

expected output is
books.amazon=NONFOUND
news.bestseller=NONFOUND

Can I first find the text between string1= books.amazon=' and string2= ' (locate the text beween the cotes)

and then replace by NOTFOUND.!! this way i can replace multiple strings. I have tried this code but no luck..



Code:
sed -i 's/\(books.amazon='\)[^<]*\('\)/NOTFOUND/g' abc.txt

pls guide
# 2  
Old 07-15-2011
Code:
$ cat replace.txt 
books.amazon='Let me read'
news.bestseller='xyz'

$ sed -i 's/=.*/=NONFOUND/' replace.txt 

$ cat replace.txt 
books.amazon=NONFOUND
news.bestseller=NONFOUND

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