I have this String.
String
var String a = \'[\"one\", \"two\", \"three\", \"four\"]\'; var ab = (a.split(\',\')); print(ab[0]); // return [\"one\
Your string looks like a valid JSON, so this should work for you:
import 'dart:convert'; ... var a = '["one", "two", "three", "four"]'; var ab = json.decode(a); print(ab[0]); // returns "one"