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

You're escaping your ( and ). I'm pretty sure you don't need to do that. Try:

sed -rne 's/(dbservername)[[:blank:]]+\([[:alpha:]]+\)/\1 yyy/gip'