Vim itself is very "sequency" in how ex commands can be entered. For example all of the following ex commands quit: q, qu, qui, quit. You could imagine vim using a regex like \vq% [uit] to check them.

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I'm one program away from using Linux full-time on my laptop - I need a replacement for Home Site (a web page editor). I can fumble around in both vim and emacs well enough to do everything I want ...