diff --git a/src/Parser/UriParser.php b/src/Parser/UriParser.php
index e968466..560e5b6 100644
--- a/src/Parser/UriParser.php
+++ b/src/Parser/UriParser.php
@@ -41,7 +41,7 @@ public function parseUri($path)
     {
         $container = $this->options['container'];
         if (!preg_match(
-            '/^\/' . preg_quote($container, '/') . '(?:\/(?<transformers>[a-zA-Z0-9_\-,\/]+))\/f_key(?<file_path>\/.+)$/',
+            '/^\/'.preg_quote($container, '/').'(?:\/(?<transformers>[a-zA-Z0-9_\-,\/]+))\/f_key(?<file_path>\/.+)$/',
             $path,
             $matches
         )) {