AT
String value = "{\"id\":{FF847500-65F7-4893-A620-D2476A9B66D4},\"Annotation\":\" \",\"name\":\"Тельмановский р-н\",\"dateCreated\":Tue Aug 04 13:26:44 ALMT 2015,\"code\":245,\"sprid\":\"245\"}";
System.outout.println(value.replaceFirst("\"id\"\\s*:\\s*\\{[^}]*}\\s*,", ""));