正则表达式

//========================ig以及replace的使用
str1 = '我们是程序员,程序员是个奇怪的存在';
var newStr1 = str1.replace(/程序员/g, '[黑客]');
str2 = 'abAcedA'
var newStr2 = str2.replace(/a/ig, 'P')

console.log("newStr1", newStr1);
console.log("newStr2", newStr2);


//======================\D与[^0-9]的效果相同
str3 = "123456"
str4 = "123456w"
var regexp1 = /\D/
var regexp2 = /[^0-9]/

console.log(regexp1.test(str3))
console.log(regexp2.test(str4))

//======================或的使用与使用[]的效果是一样的
str5 = "abcde"
var regexp3 = str5.replace(/a|c/g, '[replace]')
var regexp4 = str5.replace(/[ac]/g, '[replace]')

console.log("regexp3", regexp3)
console.log("regexp4", regexp4)

//=======================匹配任意字符
str6 = "abc 12.3"
var regexp5 = str6.replace(/[\d\D]/g, '*|')
console.log("regexp5", regexp5)

//======================在字符串替换中使用分组
var str7 = '15013795539';
var regexp7 = str7.replace(/(\d{3})(\d{4})(\d{4})/, '$1****$3');
console.log("regexp7", regexp7);

//=======================惰性匹配
var str8 = '我们是web前端开发工程师';
var regexp8 = /web.*/
console.log(str8.match(regexp8))

//===================
var regexp9 = /^(^[1-9]\d{7}((0\d)|(1[0-2]))(([0|1|2]\d)|3[0-1])\d{3}$)|(^[1-9]\d{5}[1-9]\d{3}((0\d)|(1[0-2]))(([0|1|2]\d)|3[0-1])((\d{4})|\d{3}[Xx])$)$/

//==========日期
var str11 = "2019-12-29"
    //错误的实例，使用或运算的时候，需要使用()括起来，否则出错
    // var regexp10 = /^[1-2][1-9]{3}-(0[1-9]|1[0-2])-(0[1-9]|1\d|2\d|2[1-8]|3[0-1])$/     
    // 正确的实例
var regexp10 = /^[1-2]\d{3}-(0[1-9]|1[0-2])-(0[1-9]|1\d|2\d|2[0-8]|3[0-1])$/
console.log("str11====", regexp10.test(str11))

//============获取数据,懒加载

let obj = { "status": 0, "data": { "desc": "\u003cp\u003e\u003cimg style=\"width: 750px; height: 390px;\" src=\"https://mall.s.maizuo.com/ccc5c52f2650eb1e53baf050b8f8474c.jpg\"\u003e\u003cimg style=\"width: 750px; height: 390px;\" src=\"https://mall.s.maizuo.com/0913e57225efe1c83094014d0114fe43.jpg\"\u003e\u003cimg style=\"width: 750px; height: 390px;\" src=\"https://mall.s.maizuo.com/332623886192f46875972f38ae602480.jpg\"\u003e\u003cimg style=\"width: 750px; height: 390px;\" src=\"https://mall.s.maizuo.com/d0cbaabb52ee43bb3f2d3bcdd4f7eaf4.jpg\"\u003e\u003cimg style=\"width: 750px; height: 390px;\" src=\"https://mall.s.maizuo.com/aaa99ec25aa3c900063f12bf0459aa70.jpg\"\u003e\u003cimg style=\"width: 750px; height: 390px;\" src=\"https://mall.s.maizuo.com/b2553a8b3d5ef3af23d91c0a2bf76f5c.jpg\"\u003e\u003cimg style=\"width: 750px; height: 390px;\" src=\"https://mall.s.maizuo.com/36bf84a2f561f3617a0a82693152180a.jpg\"\u003e\u003cimg style=\"width: 750px; height: 390px;\" src=\"https://mall.s.maizuo.com/4c0e7a27040aadfd1191635e65397e87.jpg\"\u003e\u003cimg style=\"width: 750px; height: 390px;\" src=\"https://mall.s.maizuo.com/dc83a25e0d8c4572d45ef9d051b021f9.jpg\"\u003e\u003cimg style=\"width: 750px; height: 390px;\" src=\"https://mall.s.maizuo.com/5a5077995c9952f83f6a5b0a683cd716.jpg\"\u003e\u003cimg style=\"width: 750px; height: 390px;\" src=\"https://mall.s.maizuo.com/806c26ccb96cf77cd69d59154c40072b.jpg\"\u003e\u003cimg style=\"width: 750px; height: 390px;\" src=\"https://mall.s.maizuo.com/ab6153817e569acc5d9a14482221c2eb.jpg\"\u003e\u003cimg style=\"width: 750px; height: 390px;\" src=\"https://mall.s.maizuo.com/1fc89caf7e8b5335a82b88ec8761a19b.jpg\"\u003e\u003cimg style=\"width: 750px; height: 390px;\" src=\"https://mall.s.maizuo.com/484864728cd700e630db9a4a44924b58.jpg\"\u003e\u003cimg style=\"width: 750px; height: 390px;\" src=\"https://mall.s.maizuo.com/e0a6d61dad787c7050c2fda20714204c.jpg\"\u003e\u003cimg style=\"width: 750px; height: 390px;\" src=\"https://mall.s.maizuo.com/6715edf1f2f31587c99ef04e72a1dd59.jpg\"\u003e\u003cimg style=\"width: 750px; height: 390px;\" src=\"https://mall.s.maizuo.com/ddc94532e8d0b9d3870ee84769f6ca70.jpg\"\u003e\u003cimg style=\"width: 750px; height: 580px;\" src=\"https://mall.s.maizuo.com/4f5637e0114c538bd9c24f27fd63072d.jpg\"\u003e\u003cimg style=\"width: 750px; height: 503px;\" src=\"https://mall.s.maizuo.com/e7d6258b2df56c0a2f2d099dd5b1f981.jpg\"\u003e\u003cimg style=\"width: 750px; height: 310px;\" src=\"https://mall.s.maizuo.com/12f7dde166e2576e8ce5667dd37633ab.jpg\"\u003e\u003cbr\u003e\u003c/p\u003e" }, "msg": "success" }
let str12 = obj.data.desc
    // 错误的实例，不能加^和$,因为这样会限制它，会出现错误
    // let regexp12 = /^https.*?(jpg|png)$/g
    //正确的实例
let regexp12 = /https?:\/\/.*?\.(jpg|png)/g
    // let regexp12 = /https.*?(jpg|png)/g
let arr = str12.match(regexp12)
let imgArr = []
arr.forEach(item => {
        let i = "![](" + item + ")"
        imgArr.push(i)
    })
    // console.log("imgArr", imgArr)

//===============数组
let arr1 = [1, 2, 3]
console.log("数组", imgArr.join(""))