解析字符串:提取单词和短语[JavaScript]

const str = "Hello, world!";
const words = str.split(" ");
console.log(words); // ["Hello,", "world!"]

const str = "Hello, world!";
const regex = /\w+/g;
const words = str.match(regex);
console.log(words); // ["Hello", "world"]

const str = "Hello, world!";
const regex = /world/g;
const newStr = str.replace(regex, "JavaScript");
console.log(newStr); // "Hello, JavaScript!"

const str = "Hello, world!";
const regex = /world/g;
const index = str.search(regex);
console.log(index); // 7