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sed replace nth characters with string

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# 1  
Old 03-22-2015
sed replace nth characters with string
Hi,

I hope you can help me out please?

I need to replace from character 8-16 with AAAAAAAA and the rest should stay the same after character 16

Code:
gtwrhtrd11111111rjytwyejtyjejetjyetgeaEHT
wrehrhw22222222hytekutkyukrylryilruilrGEQTH
hrwjyety33333333gtrhwrjrgkreglqeriugn;RUGNEURGU

Code:
gtwrhtrdAAAAAAAArjytwyejtyjejetjyetgeaEHT
wrehrhwAAAAAAAAhytekutkyukrylryilruilrGEQTH
hrwjyetyAAAAAAAAgtrhwrjrgkreglqeriugn;RUGNEURGU

Thank you very much
Last edited by Don Cragun; 03-22-2015 at 04:58 PM.. Reason: Add CODE and ICODE tags.
# 2  
Old 03-22-2015
Any attempts from your side?
# 3  
Old 03-22-2015
Yes but adds the the string infront

Code:
sed -r 's/^(........)./\1AAAAAAAA/' test

result

gtwrhtrdAAAAAAAA1111111rjytwyejtyjejetjyetgeaEHT
# 4  
Old 03-22-2015
You need to give the search pattern something to replace. With BREs:
Code:
sed 's/\(.\{8\}\).\{8\}/\1AAAAAAAA/' file
gtwrhtrdAAAAAAAArjytwyejtyjejetjyetgeaEHT
wrehrhw2AAAAAAAAytekutkyukrylryilruilrGEQTH
hrwjyetyAAAAAAAAgtrhwrjrgkreglqeriugn;RUGNEURGU

If your sed handles EREs, try:
Code:
sed -E 's/(.{8}).{8}/\1AAAAAAAA/' file
gtwrhtrdAAAAAAAArjytwyejtyjejetjyetgeaEHT
wrehrhw2AAAAAAAAytekutkyukrylryilruilrGEQTH
hrwjyetyAAAAAAAAgtrhwrjrgkreglqeriugn;RUGNEURGU

These 2 Users Gave Thanks to RudiC For This Post:
Kibou stinkefisch
# 5  
Old 03-22-2015
superb thanks
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