How can unicode (%u2014) be handled in JavaScript or C#/.NET?

While browsing through the vast expanse of the internet (specifically on a review site like Rotten Tomatoes), I stumbled upon %u2014. This particular string reminded me of something I once encountered in JavaScript. Although I can't quite recall if it was within a string or not, I suspect it might be some sort of escape or URI escape.

Curious to unravel this mystery, I attempted to execute decodeURIComponent('%u2014') in my console only to receive a disheartening URIError: malformed URI sequence. Is there anyone out there who knows how to decode this elusive character? The thought of using \x keeps hovering at the back of my mind, even though I am uncertain of its relevance.

The question remains - how can one successfully decode this unicode character?

javascript.netunicodeescaping

Answer №1

The %uNNNN format originates from the escape function in JavaScript - resembling URL-encoding, yet serving as a distinct and somewhat unnecessary encoding type specific to JS.

To counteract this within your JavaScript code, simply make use of the unescape() method.

Answer №2

To tackle this issue, utilizing RegExp to identify the pattern and decode characters would be an effective approach. It's worth noting that using the %uXXXX format may not be considered a good practice in general.

var decodeUE = (function () {
    var reg = /%u([\dA-F]{4})|%([\dA-F]{2})/ig,
        helper = function (m, a, b) {
            if (a) return String.fromCharCode(parseInt(a, 16));
            if (b) return String.fromCharCode(parseInt(b, 16));
        };
    return function decodeUE(s) {
        return s.replace(reg, helper);
    };
}());

var enc = '%u2014 %33 %AF %u1A2B';

decodeUE(enc); // "— 3 ¯ ᨫ"

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