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From: Andreas Roehler <andreas.roehler@easy-emacs.de>
Newsgroups: gmane.emacs.devel
Subject: string-strip
Date: Tue, 20 Jun 2006 12:26:11 +0200
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Cc: Richard Stallman <rms@gnu.org>
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Looks great. Thanks.

Here with this example included:

(defun string-strip (str)
  "Return a copy of STR with leading and trailing white space removed.

\(string-strip \" foo \")      => \"foo\"
\(string-strip \" \\nfoo\\n \")  => \"foo\"
\(string-strip \" foo\\nbar \") => \"foo\\nbar\"
\(string-strip \" \")          => \"\"
\(string-strip \" \\n \")       => \"\"
"
  (save-match-data
    (string-match
"\\`[[:space:]\n]*\\(\\(?:.\\|\n\\)*?\\)[[:space:]\n]*\\'" str)
    (match-string 1 str)))