Question

How to add spaces to a number every 4 digits in Node.js

Answer 1

const cardNumber = "7003124531456789";

const cardNumberWithSpaces = cardNumber.replace(/(.{4})/g, "$1 ");

console.log(cardNumberWithSpaces);

 
 
/*
run:
 
7003 1245 3145 6789
 
*/

 

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Answer 2

const cardNumber = "7003124531456789";

const cardNumberWithSpaces = cardNumber.match(/.{1,4}/g);
  
console.log(cardNumberWithSpaces);
console.log(cardNumberWithSpaces.join(' '));
 
   
   
/*
run:
   
[ '7003', '1245', '3145', '6789' ]
7003 1245 3145 6789
   
*/

 

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