String.Split node using the “\” character as the splitter. This will pull the N apart from the E values giving you sublists.
String.Split again using the : character as the splitter. This will give you sublists in your sublists for the prefix and the value.
List.LastItem at Level2 keeping the levels (so @@L2) will give you the numbers, but they’ll still be strings. Convert them to numbers and you’ll just have to pull the indexes to create points.
Note that if your prefix has meaning (ie: the N changes to an S) you’ll have to add a few more steps.