js regexp match

// 基本匹配
let str = "Hello, world!";
let result = str.match(/world/);
console.log(result); // 输出: ["world", index: 7, input: "Hello, world!", groups: undefined]

// 分组捕获
str = "The quick brown fox jumps over the lazy dog";
result = str.match(/(quick) (brown)/);
console.log(result); // 输出: ["quick brown", "quick", "brown", index: 4, input: "The quick brown fox jumps over the lazy dog", groups: undefined]

// 使用量词
str = "aaabbbccc";
result = str.match(/a+/);
console.log(result); // 输出: ["aaa", index: 0, input: "aaabbbccc", groups: undefined]

// 边界匹配
str = "Only at the start and end";
result = str.match(/^Only.*end$/);
console.log(result); // 输出: ["Only at the start and end", index: 0, input: "Only at the start and end", groups: undefined]

// 字符类
str = "123-456-7890";
result = str.match(/^\d{3}-\d{3}-\d{4}$/);
console.log(result); // 输出: ["123-456-7890", index: 0, input: "123-456-7890", groups: undefined]

let str = "apple orange banana apple";
let result = str.match(/apple/g);
console.log(result); // 输出: ["apple", "apple"]