From mboxrd@z Thu Jan  1 00:00:00 1970
From: Joe Perches <joe@perches.com>
Subject: Re: [PATCH] git-send-email.perl: Deduplicate "to:" and "cc:"
 entries with names
Date: Sat, 20 Nov 2010 13:01:17 -0800
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To: Andreas Schwab <schwab@linux-m68k.org>
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On Sat, 2010-11-20 at 21:15 +0100, Andreas Schwab wrote:
> Joe Perches <joe@perches.com> writes:
> > diff --git a/git-send-email.perl b/git-send-email.perl
> > index f68ed5a..1ae5fbf 100755
> > --- a/git-send-email.perl
> > +++ b/git-send-email.perl
> > @@ -960,7 +960,7 @@ sub maildomain {
> >  sub send_message {
> >  	my @recipients = unique_email_list(@to);
> >  	@cc = (grep { my $cc = extract_valid_address($_);
> > -		      not grep { $cc eq $_ } @recipients
> > +		      not grep { $cc eq $_ || $_ =~ /<${cc}>$/ } @recipients
>                                                     /<\Q${cc}\E>$/

Why are \Q and \E useful here?
extract_valid_address provides an unadorned email address.
I've now tested with and without, both seem to work properly.