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From: Richard Stallman <rms@gnu.org>
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Subject: Re: string-strip
Date: Mon, 19 Jun 2006 03:42:16 -0400
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Xref: news.gmane.org gmane.emacs.devel:55993
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    What about to introduce a simplified version of `comment-string-strip' 
    into subr.el - if it's not already somewhere?

    (defun my-string-strip (str)
      "Strip STR of any leading (if BEFOREP) and/or trailing (if AFTERP) space."
      (string-match "\\`\\s-*\\(.*?\\)\\s-*\n?\\'" str)
      (match-string 1 str))

    (string-strip "asdf ")"asdf"
    (string-strip " asdf")"asdf"
    (string-strip " asdf ")"asdf"

It is a useful function and a simple one, and it won't delay the
release much.  If you write the manual and NEWS changes for it first,
I will say yes.