# How to replace some preceding characters with a constant 4 asterisks and display the last 3 as well - JavaScript?

JavascriptWeb DevelopmentFront End TechnologyObject Oriented Programming

Let’s say the following are our values −

'6778922'
'76633 56 1443'
'8888 4532 3232 9999'

We want the preceding characters to be replaced with 4 asterisks and the display rest of the last 3 characters. The output should be −

**** 922
**** 443
**** 999

For such conditions, use the replace() and set regex in it.

## Example

Following is the code −

const hideDataWithDot = value => value.replace(/.+(.{3})$/, "****$1");
console.log(hideDataWithDot('6778922'))
console.log(hideDataWithDot('76633 56 1443'))
console.log(hideDataWithDot('8888 4532 3232 9999')) 

To run the above program, use the following command −

node fileName.js.


Here, my file name is demo236.js.

## Output

The output is as follows −

PS C:\Users\Amit\javascript-code> node demo236.js
**** 922
**** 443
**** 999
Published on 03-Oct-2020 15:11:14