js字符串比对解析

let str1 = "Hello";
let str2 = "Hello";
console.log(str1 === str2); // true

let text = "The rain in SPAIN stays mainly in the plain";
let regex = /ain/gi; // 查找所有包含"ain"的单词，忽略大小写
let matches = text.match(regex);
console.log(matches); // ["ain", "ain", "ain"]

let sentence = "Hello World! How are you?";
let words = sentence.split(" "); // 使用空格分割字符串
console.log(words); // ["Hello", "World!", "How", "are", "you?"]

console.log("1" === 1); // false

let str = "Hello World";
console.log(str.includes("World")); // true

let regex = /World/;
console.log(regex.test(str)); // true

let url = "https://www.example.com/path?query=string";
let regex = /^(?:https?:\/\/)?([^\/]+)/;
let match = url.match(regex);
console.log(match[1]); // www.example.com

// 或者使用URL API
let urlObj = new URL(url);
console.log(urlObj.hostname); // www.example.com