#!/usr/bin/env node

let str1 = "window.screen.orientation \\x26\\x26 /^landscape/.tes";
str1 = str1
    .replace(
        /[^\\]((\\x[\da-f]{2}|\\u[\da-f]{4})){1,}/gi,
        function ($0, $1, $2) {
            console.log($0, eval('"' + $0 + '"'));
            return eval('"' + $0 + '"');
        }
    )
    .replace(/\\[\s\S]{1}/gi, function ($0, $1, $2) {
        // console.log($0, $1)
        const c = $0 === "\\n" ? "\n" : $0[1];
        return c;
    });
console.log(str1);