send-email: extract_valid_address use qr// regexes

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: avar

git-send-email.perl

@@ -777,8 +777,8 @@ sub expand_one_alias {
 
 sub extract_valid_address {
 	my $address = shift;
-	my $local_part_regexp = '[^<>"\s@]+';
-	my $domain_regexp = '[^.<>"\s@]+(?:\.[^.<>"\s@]+)+';
+	my $local_part_regexp = qr/[^<>"\s@]+/;
+	my $domain_regexp = qr/[^.<>"\s@]+(?:\.[^.<>"\s@]+)+/;
 
 	# check for a local address:
 	return $address if ($address =~ /^($local_part_regexp)$/);