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From: Alex Schroeder <alex@emacswiki.org>
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Subject: Re: [LISP] completion of partial buffer name
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Cliff Heller <fnord@panix.com> writes:

> say for example: output1, output2, output3
> but only one such buffer would exist at any time.
>
> How can I do a non interactive completion on substring "output" to get
> the full buffer name and switch to it? 

(let ((completions (mapcar (lambda (buf)
			     (list (buffer-name buf)))
			   (buffer-list))))
  (try-completion "output" completions))
 
For me, for example:

(let ((completions (mapcar (lambda (buf)
			     (list (buffer-name buf)))
			   (buffer-list))))
  (try-completion "*scra" completions))

=> "*scratch*"

See the doc of try-completion for what happens if your prefix is
non-unique, or matches exactly, or not at all.  :)

Alex.