Github user brosander commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/1356#discussion_r93952654
  
    --- Diff: 
nifi-nar-bundles/nifi-update-attribute-bundle/nifi-update-attribute-processor/src/main/java/org/apache/nifi/processors/attributes/UpdateAttribute.java
 ---
    @@ -143,9 +144,10 @@ public ValidationResult validate(String subject, 
String input, ValidationContext
             }
         };
     
    +    public static final String DELETE_ATTRIBUTES_EXPRESSION_NAME = "Delete 
Attributes Expression";
         // static properties
         public static final PropertyDescriptor DELETE_ATTRIBUTES = new 
PropertyDescriptor.Builder()
    -            .name("Delete Attributes Expression")
    +            .name(DELETE_ATTRIBUTES_EXPRESSION_NAME)
                 .description("Regular expression for attributes to be deleted 
from FlowFiles.")
    --- End diff --
    
    @JPercivall my goal was to preserve existing behavior, I was looking at 
what the code does, not the documentation.  I'll try to clarify both here and 
in the doc.


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