A sed question

[Unga]

Hi all

I want to translate following GNU sed lines to FreeBSD sed:

1. sed -e '/\*address:/{n;s at .*@replaceText @}'

2. sed -e '/\*address:/{n;s@$@ replaceText@}'

Appreciate if someone could help with it.

Is there a good documentation about FreeBSD sed other than man page?

Kind regards
Unga