[CentOS] awk global replacement only after keyword

>Can you use a regexp like:
>s/\(known_part\)\(.*\)\(change_part\)/\1\2replace_part/

Unless I misunderstand that, I'd say no.

The actual file might look this:

/begin file

foo bar{
	biz	service-one
	baz	service-two
}

--many more of that--

# comment

fiz bir{
	aaa	service-one
	bbb	service-two
}

/end file

So only after the "# comment", I want to then start replacing.
I am just trying to replace a very ugly long set of commands piped into
each other that I am using now.

Thanks!
jlc