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

[jeffrey.ratcliffe@gmail.com]

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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.

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