一般来说，要从"www.example.com"中取出"www.example.com"，需要使用new URL()： https://youtu.be/G7KNmW9a75Y " out of " https://youtu.be/G7KNmW9a75Y?list=PL08MW4hWrm0I5BMN-Z_r8dqRdNTyuyRaD " you need to use new URL() :
let u = new URL('https://youtu.be/G7KNmW9a75Y?list=PL08MW4hWrm0I5BMN-Z_r8dqRdNTyuyRaD')${u.origin}${u.pathname}//" www.example.com "〈--您的答案https://youtu.be/G7KNmW9a75Y" <-- your answer
完整代码：

const myStr =
        "test test test https://youtu.be/G7KNmW9a75Y?list=PL08MW4hWrm0I5BMN-Z_r8dqRdNTyuyRaD https://www.youtube.com/watch?v=JlOZR5OwS-8&list=PL08MW4hWrm0I5BMN-Z_r8dqRdNTyuyRaD&index=4 test test test";

      const result = myStr
        .split(" ")
        .map((str) => {
          if (str.match(/\bhttps?:\/\/\S+/gi)) {
            let u = new URL(
              "https://youtu.be/G7KNmW9a75Y?list=PL08MW4hWrm0I5BMN-Z_r8dqRdNTyuyRaD"
            );
            return `${u.origin}${u.pathname}`;
          }

          return str;
        })
        .join("\r\n");

      console.log("result", result); // I noticed that the result of the `map()` fn should be stored in variable otherwise strings won't be placed in new lines