Well done Dave.  This is a knockout episode.  Contains a lot of the more obscure stuff in sed that is really useful and hard to find examples of online.

I personally like you reading out the command-line examples as I can make a mental note of what strings to search for in your show notes to refer back later.

I've used sed for years but it is an inexhaustible subject.

Looking forward to the awk series, never having really got my head round awk :-p