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From: Roy Smith <roy@panix.com>
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Subject: looping over characters in a string in elisp?
Date: Wed, 25 Dec 2002 18:53:54 -0500
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I'm probably being dense, but 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)
)