Error in match when using jQuery RegExp in whole string match

Question

It seems to me that jQuery RegExp can't handle matching in whole string.

Here is regex pattern and function for test string:

var billMonthYearRg = new RegExp("^\D*([0-9]+)\s?(-|\/)\s?([0-9]{4})\D*$", "gi");
$('#Description').on('change', function () {
  var matches = billMonthYearRg.exec($('#Description').val());
  if (matches != null && matches.length > 3) {
    $('#BillMonth').val(matches[1]);
    $('#BillYear').val(matches[3]);
  }
});

I try to match month-year from text, but only if it occurs one time and if there is no more numeric values, Eg. 'Something non digit text 11-2222 Something non digit text'.

Pattern is OK, when we move ^ at the begging and $ at the end of pattern, but then we get match if there mm-yyyy occurs more the ones.

As input for 'Description' for, we use:

    <textarea id="Description" name=""></textarea>
    <input id="BillMonth" type="number" name="BillMonth" />
    <input id="BillYear" type="number"  name="BillYear"/>

We were test regext on https://regex101.com/ and it work fine, but on site it is not working.

We use jQuery JavaScript Library v2.1.4

`var billMonthYearRg = /^\D*([0-9]+)\s?([-\/])\s?([0-9]{4})\D*$/gi;`. — Wiktor Stribiżew, Feb 09 '16 at 14:46
Note that you can write too: `var billMonthYearRg = new RegExp(/^\D*([0-9]+)\s?([-\/])\s?([0-9]{4})\D*$/, "gi");` or `var billMonthYearRg = new RegExp("^\\D*([0-9]+)\\s?([-/])\\s?([0-9]{4})\\D*$", "gi");` — Casimir et Hippolyte, Feb 09 '16 at 14:49

Error in match when using jQuery RegExp in whole string match

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