Remove character Before , After & in between the String and add _ in between the string

[AKPWZ]

I have a string field that looks like this "0.HTTP.2.WebText"  (a JSON_Name field).

And I want to remove the unwanted character using regex or any other formula in my workflow to achieve the output.

The output should look like this - "HTTP_WebText".

Any idea how to solve this, please? Thanks.

[Jean-Balteryx]

Same as @atcodedog05! 😊