Javascript - Regex to replace last 4 digit

Question

I have a number variable at JavaScript and i want it replaced in last 4 character. Example:

I have a number 123456789 and i want it to be replaced like this 12345****

Is there any regex to do that in JavaScript?

Answer 1

Use replace() with regex /\d{4}$/

var res = '123456789'.replace(/\d{4}$/, '****');
document.write(res);

Regex explanation

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Or using substring() or substr()

var str = '123456789',
  res = str.substr(0, str.length - 4) + '****';
document.write(res);

Answer 2

You could use substring as well:

var s = '123456789';
var ns = s.substring(0, s.length - 4) + '****';
document.write(ns);