Sed substitute recursively

Question

echo ddayaynightday | sed \'s/day//g\'

It ends up daynight

Is there anyway to make it substitute until no more match ?

Answer 1

The g flag deliberately doesn't re-match against the substituted portion of the string. What you'll need to do is a bit different. Try this:

echo ddayaynightday | sed $':begin\n/day/{ s///; bbegin\n}'

Due to BSD Sed's quirkiness the embedded newlines are required. If you're using GNU Sed you may be able to get away with

sed ':begin;/day/{ s///; bbegin }'