sed: Replace part of a line

Question

How can one replace a part of a line with sed?

The line

DBSERVERNAME     xxx

should be replaced to:

DBSERVERNAME           


        

Answer 1

Try this

sed -re 's/DBSERVERNAME[ \t]*([^\S]+)/\yyy/ig' temp.txt

or this

awk '{if($1=="DBSERVERNAME") $2 ="YYY"} {print $0;}' temp.txt