How to rename a field with regex

Elastic Stack Logstash
1

I have a log like this:

{"A.amazon.aws.requestedParameters":{"testlabel1":"testvalue1"}}
{"B.amazon.aws.requestedParameters":{"testlabel1":"testvalue1"}}
...

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?

2

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