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Quoth Maxime Chupin <mc@melusine.eu.org>, on 2010-10-16 09:43:22 +0100:
> Why does not it  work as I want ? %s is not only for the space ?

A newline is also a whitespace character.  You're probably thinking of
only horizontal space.  There's no builtin class for that (that I know
of); use [ \t] instead or similar.

   ---> Drake Wilson