けんき => YSITD: ES5 "𠮷".match(/(?:[\0-\t\x0B\f\x0E-\u2027\u202A-\uD7FF\uE000-\uFFFF][\uD800-\uDBFF][\uDC00-\uDFFF][\uD800-\uDBFF](?![\uDC00-\uDFFF])(?:[^\uD800-\uDBFF]^)[\uDC00-\uDFFF])/)[0].length === 2; ES6 "𠮷".match(/./u)[0].length === 2 #57cffcf4b7b56c216e574bbc

けんき says to YSITD

ES5 "𠮷".match(/(?:[\0-\t\x0B\f\x0E-\u2027\u202A-\uD7FF\uE000-\uFFFF][\uD800-\uDBFF][\uDC00-\uDFFF][\uD800-\uDBFF](?![\uDC00-\uDFFF])(?:[^\uD800-\uDBFF]^)[\uDC00-\uDFFF])/)[0].length === 2; ES6 "𠮷".match(/./u)[0].length === 2

at Wed, Sep 7, 2016 7:41 PM