How to rename a field with regex

I have a log like this:


and I want to change the field name to something like this: A-requestedParameters , B-requestedParameters, ...
I checked the mutate filter plugin but it doesn't work with regex.
How can I do it?

You have only rename to change fieldname1 to fieldname2.
If you want to use regex, then you need ruby. Check sample.

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