Converting an array to string

Sorry for the title but I was not sure on how to make it... I built a dynamic variable by adding quotes and square brackets to extracted email from a webrequest. Each email is separated with coma. I use this as a part of another webrequest but in a new post request, I need to use the same list but without the quotes and I m just not able to extract anything since its not considered as arry so arrayItem() not working on it and I can only extract the full variable, even a string() , text() or replace() is not working (return empty).

I want to pass from :




or simply extract each email like this: ""

actually I could get each email with quotes but no brackets... I could add quotes in my expression but just cannot extract anything from the variable.