From 4131e9c2494aac463cf4be491f34a8877514b9bb Mon Sep 17 00:00:00 2001
From: NicoHood <git@nicohood.de>
Date: Wed, 6 Jan 2021 13:52:06 +0100
Subject: [PATCH] Fix page extension validation

---
 system/src/Grav/Common/Uri.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/system/src/Grav/Common/Uri.php b/system/src/Grav/Common/Uri.php
index 32c6e4157b..89f1518f83 100644
--- a/system/src/Grav/Common/Uri.php
+++ b/system/src/Grav/Common/Uri.php
@@ -1353,7 +1353,7 @@ public function isValidExtension($extension)
         $valid_page_types = implode('|', Utils::getSupportPageTypes());
 
         // Strip the file extension for valid page types
-        if (preg_match('/(' . $valid_page_types . ')/', $extension)) {
+        if (preg_match('/^(' . $valid_page_types . ')$/', $extension)) {
             return true;
         }
         return false;