The bug is due to Perl 5.18: http://search.cpan.org/~rjbs/perl-5.18.1/pod/perlrecharclass.pod#Whitespace
the vertical tab \cK (0x0b) is matched by \s. 2013/12/5 Debian Bug Tracking System <ow...@bugs.debian.org> > Thank you for the additional information you have supplied regarding > this Bug report. > > This is an automatically generated reply to let you know your message > has been received. > > Your message is being forwarded to the package maintainers and other > interested parties for their attention; they will reply in due course. > > Your message has been sent to the package maintainer(s): > Stefano Rivera <stefa...@debian.org> > > If you wish to submit further information on this problem, please > send it to 731...@bugs.debian.org. > > Please do not send mail to ow...@bugs.debian.org unless you wish > to report a problem with the Bug-tracking system. > > -- > 731461: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=731461 > Debian Bug Tracking System > Contact ow...@bugs.debian.org with problems >