Thx to you both for the tips.
Using ${literal('\r')} works great. Clean and simple.
Joe Percivall wrote
> This question actually gets back to a discussion on the user entering
> literal vs. escaped text. In the NiFi UI the user inputs the text into the
> box and then it is converted into a Java String which gets automatically
> escaped in order to pass along the string as the user wrote it (so a
> processor would see the literal characters "\" and "n" when the user wrote
> "\n"). Though sometimes (as evidenced by this case) the user wants the
> control character instead of the literal values entered and Koji's
> suggestion of using EL as a work-around is great. That said, I do believe
> that "${literal('\r')}" can be used instead so that a replace isn't
> needed.
>
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