Escape arbitrary strings for the rest processor

The Flexible REST API processor throws a parsing Exception when i insert data from a column to the body.

Is there a regex to escape all signs which would through a JSON parse Error?
Is there a list of signs i do have to escape ?

I am using a column to determine the body of the Flexible REST API processor like so:

    "Bodyfield": "##columnValueFrom##mycolumnWithAllSortsOfStrings##"

There will be all sorts of strings in the column “mycolumnWithAllSortsOfStrings”.