Extracting URL Parameters in JavaScript

The getParameterByName function retrieves the value of a specified query parameter from a given URL, ensuring special characters are properly escaped and decoded. This helps developers easily access and manipulate URL parameters in web applications, improving dynamic content handling.

function getParameterByName(name, url) {
            if (!url)
                url = window.location.href;
            name = name.replace(/[[]]/g, "$&");
            var regex = new RegExp("[?&]" + name + "(=([^&#]*)|&|#|$)"),
                results = regex
                    .exec(url);
            if (!results)
                return null;
            if (!results[2])
                return ' ';
            return decodeURIComponent(results[2].replace(/+/g, " "));
        }