Github user JPercivall commented on the issue: https://github.com/apache/nifi/pull/1356 Sorry @brosander but I was a bit wrong when talking about the ordering of the Delete; I should have tested first. It appears that instead of deleting both attributes that were initially there and new attributes, it only deletes already present attributes. That is because, although it does the delete after the addAttribute, the regex is only run on the attributes that already existed[1]. So again it does keep the same ordering as before but it's contrary to what we though. Everything else looks good though. If you could change the documentation (and maybe throw in a unit test) for the delete ordering I will +1 and merge. [1] https://github.com/apache/nifi/blob/b519204602a5bd40f219f77ac556563010eca4c1/nifi-nar-bundles/nifi-update-attribute-bundle/nifi-update-attribute-processor/src/main/java/org/apache/nifi/processors/attributes/UpdateAttribute.java#L601-L601
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