Need help pulling string from a website to use in rules

[switch (Joseph Rogers)]

I did a little home work and found a solution based on this post:

[SOLVED] How to split a string in a rule

Hi. I’m new to openhab. I have configured an MQTT feed from my emonpi to openhab and got it working OK. What my item is returned, is a string of values like “2307,28,0,2253,241.22,300,300,300,300,300,300,1”. I want to be able to pick out one of the values and display just that value (eg. 2253). I was trying to do that in a rule with a string array and toString.split(",") - that seems to work OK but when I reference one of the array variables (array[0]) it says it is NULL. Can anyone tell me …

Items file

String AirbnbGuest_Name "Airbnb guest names" 	(gSkur) { http="<[HTTP://mywebsite.com:300000:JS(getSFBayAirbnbGuestName.js)]"}

getSFBayAirbnbGuestName.js

(function(csv) { 
  var arr = csv.split("Greetings ");
  var arr2 = arr[1].split(",</B>");
  return arr2[0];
})(input);