How to find whether a particular string has unicode characters (esp. Double Byte characters)

I used mikesamuel answer on this one. However I noticed perhaps because of this form that there should only be one escape slash before the u, e.g. \u and not \\u to make this work correctly.

function containsNonLatinCodepoints(s) {
    return /[^\u0000-\u00ff]/.test(s);
}

Works for me 🙂