How to get the nth occurrence in a string?

Question

I would like to get the starting position of the 2nd occurrence of ABC with something like this:

var string = "XYZ 123 ABC 456 ABC 789 ABC";
getPosition(string, 'ABC', 2) // --> 16

How would you do it?

Answer 1

const string = "XYZ 123 ABC 456 ABC 789 ABC";

function getPosition(string, subString, index) {
  return string.split(subString, index).join(subString).length;
}

console.log(
  getPosition(string, 'ABC', 2) // --> 16
)