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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