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From: "Eli Zaretskii" <eliz@elta.co.il>
Newsgroups: gmane.emacs.help
Subject: Re: string func to use in .emacs
Date: Sun, 25 Jan 2004 19:59:42 +0200
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> From: Peter Wu <peterwu@hotmail.com>
> Newsgroups: gnu.emacs.help
> Date: Sun, 25 Jan 2004 09:21:07 -0500
> 
> What I am looking for is like this:
> 
> input    := "Emacs "
> output   := "Emacs"    
> 
> The trailing blank space is trimmed.

Try this:

  (let ((i (string-match " +\\'" input)))
    (when i
         (setq output (substring input 0 i))))

(You may wish to replace `output' with `input', so that it is
destructively trimmed.)