実際の事例と高度なテクニックを共有する: JavaScript 正規表現の高度なアプリケーション

// 忽略大小写匹配
let regex = /hello/i;
console.log(regex.test("Hello")); // true

// 全局匹配
let regex2 = /hello/g;
console.log("hello world".replace(regex2, "hi")); // hi world

// 多行匹配
let regex3 = /^hello/m;
console.log(regex3.test("hello
world")); // true

// 匹配换行符
let regex4 = /hello.world/s;
console.log(regex4.test("hello
world")); // true

// 匹配数字
let regex = /[0-9]/;
console.log(regex.test("123")); // true

// 匹配括号内的内容
let regex2 = /((.*?))/;
let match = "Hello (world)".match(regex2);
console.log(match[1]); // world

// 匹配单词边界
let regex3 = /hello/;
console.log(regex3.test("say hello")); // true

// 捕获分组
let regex = /(d+)s+s(d+)s=/;
let match = "1 + 2 =".match(regex);
console.log(match[1]); // 1
console.log(match[2]); // 2

// 非捕获分组
let regex2 = /(?:d+)s+s(?:d+)s=/;
let match2 = "1 + 2 =".match(regex2);
console.log(match2); // null

// 前查找
let regex = /hello(?= world)/;
console.log(regex.test("hello")); // false
console.log(regex.test("hello world")); // true

// 后查找
let regex2 = /(?<=hello) world/;
console.log(regex2.test("world")); // false
console.log(regex2.test("hello world")); // true

function validateEmail(email) {
  let regex = /w+@w+.w+/;
  return regex.test(email);
}

console.log(validateEmail("example@mail.com")); // true
console.log(validateEmail("invalid.email")); // false

function extractUrls(text) {
  let regex = /https?://[^s]+/g;
  return text.match(regex);
}

let text = "Visit my website at https://example.com or https://google.com";
console.log(extractUrls(text)); // ["https://example.com", "https://google.com"]

function filterSensitiveWords(text, wordList) {
  let regex = new RegExp(wordList.join('|'), 'gi');
  return text.replace(regex, '***');
}

let text = "This is a sensitive word: bad";
let wordList = ["bad"];
console.log(filterSensitiveWords(text, wordList)); // "This is a sensitive word: ***"