正则表达式

1.具名组

 

let reg = /(?<year>\d{4})\/(?<month>\d{1,2})\/(?<date>\d{1,2})/
const res = reg.exec('2020/3/23')
console.log(res)

 

2.引用

let str = '10/10/10'
let r = /(?<year>\d{2})\/(\k<year>)/
console.log(r.exec(str))

3.正则方法

match() 、replace()、search()、split()

matchAll() 取出所有匹配，iterator遍历

 const reg1 = /ickt\d/g
 const str1 = 'ickt1ickt2ickt3ickt4'
 console.log(reg1.exec(str1))
 console.log(reg1.exec(str1))
 console.log(reg1.exec(str1))
 console.log(reg1.exec(str1))
 console.log(str1.match(reg1))
 console.log([...str1.matchAll(reg1)])

4.demo

1.匹配 "id":1223 的形式

const str ='[{"createUser":1435892060572876800,"id":1584453765346361344,"value":""}]'
const arr = str .match(/"id":\d+/g)

2.手机号格式验证，现在除 12 开头的，其他的应该都有了

/^1[3456789]\d{9}$/