sed bug report

[Josh McFarlane]

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I believe I have found a potential bug in sed extended regular
expressions. Using the following command:
$sed -n -r '/^\s*[^\s]+\s*$/p' test.txt

Where test.txt conatins:
a
         b
a b

Produces the following output:
 a
         b
a b

In my opinion this is an unexpected behavior as this regular
expression should only print lines where there is zero or more
whitespace characters, followed by one or more non whitespace
characters, followed by zero or more whitespace characters, followed
by the end of the line.

I hope that this was of help.
Regards,
Josh McFarlane.

$ sed --version
GNU sed version 4.2.1
Copyright (C) 2009 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE,
to the extent permitted by law.

GNU sed home page: <http://www.gnu.org/software/sed/>.
General help using GNU software: <http://www.gnu.org/gethelp/>.
E-mail bug reports to: <address@hidden>.
Be sure to include the word ``sed'' somewhere in the ``Subject:'' field.
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