Function funescape

2.0.3/Sizzle.js:140–152

(_, escaped, escapedWhitespace)

            // CSS escapes http://www.w3.org/TR/CSS21/syndata.html#escaped-characters
            runescape = new RegExp("\\\\([\\da-f]{1,6}" + whitespace + "?|(" + whitespace + ")|.)", "ig"),
            funescape = function(_, escaped, escapedWhitespace) {
                var high = "0x" + escaped - 0x10000;
                // NaN means non-codepoint
                // Support: Firefox
                // Workaround erroneous numeric interpretation of +"0x"
                return high !== high || escapedWhitespace ?
                    escaped :
                // BMP codepoint
                high < 0 ?
                    String.fromCharCode(high + 0x10000) :
                // Supplemental Plane codepoint (surrogate pair)
                String.fromCharCode(high >> 10 | 0xD800, high & 0x3FF | 0xDC00);
            };

        // Optimize for push.apply( _, NodeList )
        try {