JSFiddle - React, Tailwind, and code Playground
by mhouser_nowmediagroup
HTML
<div id="output"></div>
JavaScript
var strarr = ["Chicago, IL 60611", "Oak Brook Professional Building", "120 Oakbrook Center", "Suite 318", "Oak Brook, IL 60523", "John Viviano DDS", "5045 Orbitor Drive", "Unit 10-300", "Mississauga, On L4W 4Y4", "CANADA"]
var return_val
var runlength = strarr.length
var regex = RegExp("(?<!^)([A-Z]|[a-z])[0-9]([A-Z]|[a-z]) [0-9]([A-Z]|[a-z])[0-9]$", "gm")
while(runlength--){
if(regex.test(strarr[runlength]))
$("#output").append(runlength + "<br>")
}
var arr = []
arr[4] = 6
arr[2] = 6
$("#output").append(arr[2] + "<br>")