From 1bb61efd328c2dbc2e8b84f756a960d507d8382d Mon Sep 17 00:00:00 2001
From: Daniel Stutz <daniel.stutz@sophos.com>
Date: Wed, 25 Sep 2019 17:39:26 +0200
Subject: [PATCH] simplify email regex; allow + in user part

---
 proxy/proxy.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/proxy/proxy.php b/proxy/proxy.php
index 65382bd..5b05219 100644
--- a/proxy/proxy.php
+++ b/proxy/proxy.php
@@ -221,7 +221,7 @@ function civiproxy_sanitise($value, $type) {
     }
   } elseif ($type == 'email') {
     // valid email
-    if (!preg_match("#^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$#i", $value)) {
+    if (!preg_match("#^[_a-z0-9-]+[._a-z0-9-+]*@[a-z0-9-]+[.a-z0-9-]*\.[a-z]{2,3}$#i", $value)) {
       error_log("CiviProxy: removed invalid email parameter: " . $value);
       $value = '';
     }