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From: Jesper Harder <harder@myrealbox.com>
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Subject: Re: looping over characters in a string in elisp?
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Roy Smith <roy@panix.com> writes:

> I can't figure out how to loop over each character in a string in
> elisp (I'm using emacs 20.5.1).  I know I can use mapchar to map a
> function to each character, but I'm looking for something that lets me
> do (essentially):
>
> (while char in string
>    (do stuff))

Here's two different ways:

(require 'cl)
(setq str "Test!")

(dolist (char (append str nil))
  (print char))

(dotimes (i (length str))
  (print (aref str i)))