WEBサイトのソースから正規表現で値を取得する方法

const query = document.location.search;
const params = new URLSearchParams(query)
console.log(params.get("UserID"))

const urlsWithQuery = Array.from(document.querySelectorAll("script")).filter((script) => script.src.includes("?")).map((script) => script.src);
const targetUrl = urlsWithQuery.find((url) => url.includes("id="));
const params = new URLSearchParams(targetUrl.split("?")[1]);
console.log(params.get("id"));