Question

I am trying to write a Regular Expression that replaces all the digits of a number with *’s after first 4 digits.

For example

var number = 123456789  

it should be replaced with 1234*****

Answer 1

In Javascript:

var maskedNumber = String(number).substr(0,4) + Array(String(number).length - 3).join('*');

In PHP:

$maskedNumber = str_pad(substr($number, 0, 4), strlen($number), "*");