js：邮箱校验正则

// validator.js
export function isEmail(email) {
  let emailRegExp = /^[a-zA-Z0-9_-]+@[a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)+$/
  return emailRegExp.test(email)
}

// validator.test.js
import { isEmail } from './validator.js'
test('test isEmail', () => {
  expect(isEmail('')).toBe(false)
  expect(isEmail('1234@')).toBe(false)
  expect(isEmail('@')).toBe(false)
  expect(isEmail('123@qq.com')).toBe(true)
  expect(isEmail('tom@163.com')).toBe(true)
})