:%s/foo/bar/g
in vim before.
I joined #sed on freenode for some advice, and being a good internet citizen I followed their links in the /topic before I asked. Wow, was I in for a surprise finally a sed introduction that is easy to follow and clear. Thank you so much!
My first proper regex, of which I am inordinately proud (put together with no interactive help or direct advice).
sed 's:\(VERSION \=\).*:\1 foo:'Thank you Grymoire!
--> This blog now has syntax highlighting!