Github user apiri commented on the pull request:
https://github.com/apache/nifi/pull/116#issuecomment-157450706
Was combing through the actual PR. Not sure I am onboard with the
additional property and misunderstood what the intent was. There was a similar
effort with the Character Set Validator where we validated that the specified
charset was valid if specified, otherwise just that a string was returned via
EL should it be an expression.
Regex Validator, by default evaluates the EL and then applies validation to
the resulting "regex". Would it be reasonable to have a separate validator
that matches the semantics of what you are looking for (akin to that of how
ConvertCharacterSet functions)? Should be okay from the standpoint of
compatibility and non-breaking changes.
Additionally, playing with this a bit, I did a blanket delete (.*) which
leads to some bad effects in terms of the framework as the UUID is removed and
puts us in a bad state.
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