JSFiddle - React, Tailwind, and code Playground

by jfriend00

JavaScript

var url = "http://mywebsite.com/1.html";

function nextImage() {
    return(url.replace(/(\d+)(\.html)$/, function(str, p1, p2) {
        return((Number(p1) + 1) + p2);
    }));
}

alert(nextImage());