bug#3996: Perl highlighting in perl-mode and cperl-mode

[jeffrey . ratcliffe]

In GNU Emacs 21.3.1 (x86_64-redhat-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2006-05-02 on hs20-bc1-4.build.redhat.com
configured using `configure  --build=x86_64-redhat-linux --host=x86_64-redhat-linux --target=x86_64-redhat-linux-gnu --program-prefix= --prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib64 --libexecdir=/usr/libexec --localstatedir=/var --sharedstatedir=/usr/com --mandir=/usr/share/man --infodir=/usr/share/info --with-pop --with-sound'
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8
  default-enable-multibyte-characters: t

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

In code such as:

$output =~ /default device is `(.*)'/

everything after the "`" (to the end of the buffer) is incorrectly coloured as string.