[Feature] sed edit last message.

[Techognito]

It would be nice to edit the last sent message using sed formatting, similar to how Discord and some IRC clients allows today.

by typing s/old/new/ you change the "old" with "new"

I would also be fine if I have to do :s/old/new/ with the colon, similar to vim

ℹ️ This is low priority for me, but wanted to create the request.