MAGETWO-85770: #5035 Cannot subscribe to events with a number in name #12758

Author: Oleksii Korshenko

lib/internal/Magento/Framework/Event/Test/Unit/Config/_files/valid_events.xml

@@ -12,4 +12,7 @@
     <event name="authorization_roles_save_before">
         <observer name="second_name" instance="Some_Test_Value_Two" />
     </event>
+    <event name="authorization_roles_save_before123">
+        <observer name="second_name" instance="Some_Test_Value_Two" />
+    </event>
 </config>

lib/internal/Magento/Framework/Event/etc/events.xsd

@@ -60,11 +60,11 @@
     <xs:simpleType name="eventName">
         <xs:annotation>
             <xs:documentation>
-                Event name can contain only [a-zA-Z_].
+                Event name can contain only [a-zA-Z0-9_].
             </xs:documentation>
         </xs:annotation>
         <xs:restriction base="xs:string">
-            <xs:pattern value="[a-zA-Z_]+" />
+            <xs:pattern value="[a-zA-Z0-9_]+" />
         </xs:restriction>
     </xs:simpleType>
 </xs:schema>