Separate thousands while typing in Farsi (Persian)

Question

I'm using this snippet to separate thousands inside input field while user is typing. It works correctly with English (Latin) letters but doesn't respond to Farsi (Persian) ones. Is there any way to make it compatible?

$('input.number').keyup(function(event) {

  // skip for arrow keys
  if (event.which >= 37 && event.which <= 40) return;

  // format number
  $(this).val(function(index, value) {
    return value
      .replace(/\D/g, "")
      .replace(/\B(?=(\d{3})+(?!\d))/g, ",");
  });
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input class="form-control number" type="text" value="0" name="subjectvalue" id="txt_subjectvalue">

Answer 1

This code is for Iranians. This code inserts the thousands separator after converting the number to Persian.

function insertRialComma(n) {
    let m = "";
    for (let i = 0; i < n.length; i++) {
        let c = n.substring(n.length - i - 1, n.length - i);
        if (i % 3 === 0 && i > 0) {
            m = c + "٬" + m; // Persian/Arabic thousands separator
        } else {
            m = c + m;
        }
    }
    return m;
}

function toFarsiNumber(n) {
    n = n.toString();
    let o = "";
    const farsiDigits = ["۰", "۱", "۲", "۳", "۴", "۵", "۶", "۷", "۸", "۹"];
    const englishDigits = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9"];
    for (let i = 0; i < n.length; i++) {
        for (let j = 0; j < englishDigits.length; j++) {
            if (n.substring(i, i + 1) === englishDigits[j]) {
                o = o + farsiDigits[j];
            }
        }
    }
    return o;
}

let n = insertRialComma(toFarsiNumber("1222345"));
alert(n);