How much of the power of sed does it bring? I feel like other sed expressions might be even more useful in this format. For example: 200i #TODO optimize t

How much of the power of sed does it bring? I feel like other sed expressions might be even more useful in this format. For example: 200i #TODO optimize this will insert a comment before line 200 and: s/.*goto.*/cowsay \0/e T s%^%//% s%\n%\0//%g will take every line that contains a goto and replace it with a commented out cowsay version of itself.