解法：

const str = "I am an 20-years out--standing @ * -stu- dent";function solution(str) {const arr = str.split(" ");const newArr = arr.map((str) => {if (/[a-zA-Z0-9-]/.test(str)) {if (/-{2}/g.test(str)) {return str.replace(/--/g, " ");} else if (str.startsWith("-") || str.endsWith("-")) {return str.replace(/-/g, "");} else {return str;}} else return "";});console.log("new", newArr);return newArr.reverse().filter((item) => item !== "").join(" ");
}console.log(solution(str));
/* I am an 20-years out--standing @ * -stu- dent =>  dent stu standing out 20-years an am I*/