From 4d79191e6cf75dfde33a6b38a12d9d06c1e1748c Mon Sep 17 00:00:00 2001
From: Ben Tideswell <ben@fishpig.co.uk>
Date: Thu, 26 Oct 2017 11:09:43 +0100
Subject: [PATCH] Allows modules with underscores in name to add blocks to
 layout via XML Amended to allow underscore in Vendor name as well as module
 name

---
 lib/internal/Magento/Framework/View/Layout/etc/elements.xsd | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/internal/Magento/Framework/View/Layout/etc/elements.xsd b/lib/internal/Magento/Framework/View/Layout/etc/elements.xsd
index ea80380865e6a..39cdec05a65ea 100755
--- a/lib/internal/Magento/Framework/View/Layout/etc/elements.xsd
+++ b/lib/internal/Magento/Framework/View/Layout/etc/elements.xsd
@@ -138,7 +138,7 @@
 
     <xs:simpleType name="blockClassType">
         <xs:restriction base="xs:string">
-            <xs:pattern value="[A-Z][a-zA-Z\d]*(\\[A-Z][a-zA-Z\d]*)*"/>
+            <xs:pattern value="[A-Z][_a-zA-Z\d]*(\\[A-Z][_a-zA-Z\d]*)*"/>
         </xs:restriction>
     </xs:simpleType>