Update Cart.php

Regex were already case sensitive.
diff --git a/system/libraries/Cart.php b/system/libraries/Cart.php
index 86c11d6..84be7fa 100644
--- a/system/libraries/Cart.php
+++ b/system/libraries/Cart.php
@@ -51,7 +51,7 @@
 	 *
 	 * @var string
 	 */
-	public $product_name_rules	= '\.\:\-_ a-zA-ZÀ-ÿ0-9';
+	public $product_name_rules	= '\.\:\-_ a-z�-�0-9';
 
 	/**
 	 * only allow safe product names