JSFiddle - React, Tailwind, and code Playground

JavaScript

var reg1 = new RegExp('^http:\/\/abc\.com\/\d+$');
var reg2 = /^http:\/\/abc\.com\/\d+$/;

var url = 'http://abc.com/1657706754';

// expected: true, actual: false
document.write(reg1.test(url));
document.write('<br/>');
// expected: true, actual: true
document.write(reg2.test(url));