Github user trixpan commented on the issue:
https://github.com/apache/nifi/pull/858
@pvillard31
The error is expected as the regex does not contain a capture group named
KEY. It is a bug as I should detect KEY or whatever value was chosen.
But your feedback highlights that instead of having named captures on regex
vs numbered captures on split, we rather have a single approach (i.e. numbered
captures) across both parsing strategies.
I will fix it and also provide some better insight via validation messages
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