From 4082180ba8ea2a177d04c424966c4cba442a02a0 Mon Sep 17 00:00:00 2001
From: Charles Ulrich <culrich@bityard.net>
Date: Tue, 11 Sep 2018 21:04:10 -0400
Subject: [PATCH] Allow '+' in DDNS username

Email addresses are often used as logins and the '+' character is a valid
character in email addresses. These are commonly found in gmail.com addresses,
for instance.
---
 dns/dyndns/src/www/services_dyndns_edit.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dns/dyndns/src/www/services_dyndns_edit.php b/dns/dyndns/src/www/services_dyndns_edit.php
index 5baf4c6fc..14675eff7 100644
--- a/dns/dyndns/src/www/services_dyndns_edit.php
+++ b/dns/dyndns/src/www/services_dyndns_edit.php
@@ -38,7 +38,7 @@ function is_dyndns_username($uname)
 {
     if (!is_string($uname)) {
         return false;
-    } elseif (preg_match("/[^a-z0-9\-.@_:]/i", $uname)) {
+    } elseif (preg_match("/[^a-z0-9\-.@_:+]/i", $uname)) {
         return false;
     } else {
         return true;