练习

var str = "上海，上天，上哪"
var reg = /上[海天哪]/g
console.log(str.replace(reg,"*"));    //**,**,**
var s = "你sb，它sx，他sd"
var r = /[A-z]/g
console.log(s.replace(r,"*"));    //你**，它**，他**

var str = "it4545e12m3456"
// 4545123456
var reg = /[A-z]/g
console.log(str.replace(reg,""));
去掉字母

var str = "http://www.baidu.com/sunject/1233/WQW"
var reg = /[A-z0-9]/g
console.log(str.replace(reg,"*"));//****://***.*****.***/*******/****/***

var str = "https://www.baidu.com/123456"
// https://www.baidu.com/
var reg = /[0-9]/g
console.log(str.replace(reg,""));//https://www.baidu.com/
var arr = [
{id:1001,name:"你好3455ffd"},
{id:1001,name:"他家理发店34adasfafd"},
{id:1001,name:"附加费3455asdfd"},
]
/*
[
{id:1001,name:'你好...'}
]
*/
var r = /[A-z0-9]/g
var res = arr.map(item=>{
var test = item.name.replace(r,"")+"..."
var list = {
[item.id]:test
}
return list
})
console.log(res);
将原数组处理成[{id:1001,name:'你好...'}]

var phone = "02788667777"
/*
027?
8
\d{7}
*/
//    var reg = /^...$/ 严格匹配 整个字符串必须满足正则
var reg = /^(027)?8\d{7}$/
console.log(reg.test(phone));
手机号实例

    在输入框输入电话号码，如果格式不正确就弹出输入有误
    <input type="text" id="app">
    <p style="display: none;">输入有误</p>
    <script>
        /*
        (086)?1[3456789]\d{9}
        */
       var reg = /^(086)?1[^0-2]\d{9}$/
       $('#app').keyup(function(event){
           if(event.keyCode === 13){
               var value = $(this).val()
               console.log(reg.test(value));
               if(!reg.test(value)){
                   $("p").css("display","block")
               }
           }
       })

    <input type="text" id="app" placeholder="请输入密码">
    <script>
        /*
        420983200007136010
        42\d{15}[\dx]
        42\d{15}(\dx)
        */
       var str = '420983200007136010'
       var reg = /^42\d{15}[\dx]$/
       console.log(reg.test(str));
       /*
       密码
       包含大写小写至少6位
       */
    //   var r = /^[A-z]+\d{6,}$/
      var r = /^[A-z+\d]{6,}$/
      $('#app').keyup(function(event){
          if(event.keyCode === 13){
              var value = $(this).val()
            console.log(r.test(value));
          }
      })
    </script>
    身份证号实例

var str = "<span>2395人参观</span>-<span>46人评价</span>"
// var arr = [2395,45]
var reg = /[^\d-]/g
var arr = []
arr.push(str.replace(reg,"").split("-"))
console.log(arr);//var arr = [2395,45]
筛选旧数组获取新的数组

        <p class="app">
        导演: 陈凯歌 Kaige Chen&nbsp;&nbsp;&nbsp;主演: 张国荣 Leslie Cheung / 张丰毅 Fengyi Zha...<br>
        1993&nbsp;/&nbsp;中国大陆 中国香港&nbsp;/&nbsp;剧情 爱情 同性
    </p>
    <script>
        var value = $('.app').html().trim().split("<br>")[1].trim()
        // [1993,中国大陆,剧情,爱情,同性]
        var reg = /&nbsp;|中国香港/g
        console.log(value.replace(reg,""));
        var res = value.replace(reg,"").split("/")
        var list = res[res.length-1].split(" ")
        var sum = []
        for(var i=0;i<res.length;i++){
            if(i<res.length-1){
                sum.push(res[i])
            }
        }
        sum.push(...list)
        console.log(sum);
    </script>
    获取一个这样的[1993,中国大陆,剧情,爱情,同性]数组

    <input type="text" id="app" placeholder="请输入你的邮箱">
    <script>
        /*
        邮箱验证
        2820163916@qq.com
        cheng_dong@sina.com
        */
       var reg = /^\w+@[a-z]+\.com$/
       $('#app').keyup(function(event){
           if(event.keyCode === 13){
               var value = $(this).val()
               console.log(reg.test(value));
           }
       })
    </script>
    邮箱验证

var str = "<p>冯大大发</p><br><span>666</span>"
var reg = /<[^<>]+>/g
console.log(str.replace(reg,""));
获取标签内的文本

var url = "https://movie.douban.com/subject/129205/"
// [[1,2],[9,2],[0,5]]
var reg = /[^\d]/g
var res = url.replace(reg,"")
var arr = res.split("")
var test = []
for(var i=0;i<arr.length;i+=2){
        test.push(arr.slice(i,i+2))
}
console.log(test);
获取url字符串里的数字，并将其拆分成二维数组