How to Use Regular Expressions in Lightning Web Component?

Sample Code:

CardValidation.html

======================

<template>

    <lightning-input label="Enter the card number" class="Card">

    </lightning-input>

    <lightning-button label="Submit" onclick={handleValidation}>

    </lightning-button>

</template>

CardValidation.js

====================

import { LightningElement } from 'lwc';

export default class CardValidation extends LightningElement {

    handleValidation(){

        const CardRegex="[A-Z]{5}[0-9]{4}[A-Z]{1}";

        let Card=this.template.querySelector(".Card");

        let CardVal=Card.value;

        if(CardVal.match(CardRegex)){

            Card.setCustomValidity("");

        }else{

            Card.setCustomValidity("Please Enter a Valid Card Number");

        }

        Card.reportValidity();

    }

}