isearch is probably one of the most widely known Emacs commands. Every Emacs user knows that they can run it using C-s (to search forward) and C-r to search backwards. Everyone also knows they can keep pressing C-s and C-r to go over the list of matches in the current buffer. Even at this point that’s a very useful command. But that doesn’t even scratch the surface of what isearch can do! After you’ve started isearch you can actually do a lot more than pressing C-s and C-r: Type DEL to ...
