Fix regex for validate action in admin menu

Author: diegocpires

app/code/Magento/Backend/Model/Menu/Item/Validator.php

@@ -49,7 +49,7 @@ public function __construct()
 
         $attributeValidator = new \Zend_Validate();
         $attributeValidator->addValidator(new \Zend_Validate_StringLength(['min' => 3]));
-        $attributeValidator->addValidator(new \Zend_Validate_Regex('/^[A-Za-z0-9\/_]+$/'));
+        $attributeValidator->addValidator(new \Zend_Validate_Regex('/^[A-Za-z0-9\/_\-]+$/'));
 
         $textValidator = new \Zend_Validate_StringLength(['min' => 3, 'max' => 50]);
 

app/code/Magento/Backend/etc/menu.xsd

@@ -100,7 +100,7 @@
             </xs:documentation>
         </xs:annotation>
         <xs:restriction base="xs:string">
-            <xs:pattern value="[a-zA-Z0-9/_]{3,}" />
+            <xs:pattern value="[a-zA-Z0-9/_\-]{3,}" />
         </xs:restriction>
     </xs:simpleType>