RegEx in JavaScript to mask only digit and special character(/, space, -) in a string

Question

I have to write a regex where it will mask all the digit in a string.

Eg:

Input: 1234567890 expiry date is 1211    
Output: ********* expiry date is ****

or

Input: 1211 and number is 1234567890</p>    
Output: **** and number is *********

I am using:

var myregexp = /^(?:\D*\d){3,30}\D*$/g;<br/><br/>

whole string is getting masked using the above regex.

Answer 1

The Regex you are actually using doesn't give the expected result because it matches the whole string, that's why whole string is getting masked.

Here's what you need:

var myregexp = /\d/g;

You just need to match \d each time and replace it with *, you can see it in this working Demo.

Demo:

var str = "1234567890 expiry date is 1211";

var myregexp = /\d/g;

console.log(str.replace(/\d/g, "*"));

Edit:

If you want to match white spaces and special characters such as _ and . too, you can use the following Regex:

var myregexp = /[\d\._\s]/g;