What should Regex be: remove all "\n" between [ and ]?

Question

Java

It is necessary to compose a regex for the replaceAll method:
In the line ": [\nDefault,\nElse,\n] you need to remove all inclusions "\n" (replace with ""), provided that they are within the limits exactly between the square brackets.
Is it real it?I understand how to find those characters between brackets, but how to do replace without deleting text between brackets?
Thanks