6.3、正则事例

6.3.1、只获取数字

var str = "fdsfds12121dsf";
var reg = /[^0-9]/g;
console.log(str.replace(reg,""));  //12121

6.3.2、替换敏感词

var str = "我去，我草，我这游戏打的太牛逼了";
var reg = /我[去草]|牛逼/g;
console.log(str.replace(reg,"*"));

6.3.3、把所有数字替换为 *

var str = "jsdlfsdj651616516";
var reg = /[0-9]/g;
console.log(str.replace(reg,"*"));

6.3.4、电话号码 /^1[3-9]\d{9}$/

var reg = /^1[3-9]\d{9}$/;
var str = "15671010157";
console.log(reg.test(str));

6.3.5、百度网址 /(https|http):\/\/[w]{3}.baidu.com/

var str = "https://www.baidu.com"
var s = "http://www.baidu.com"
var reg = /(https|http):\/\/[w]{3}\.baidu\.com/;
console.log(reg.test(s))

6.3.6、邮箱验证

 <input type="text" placeholder="请输入邮箱" id="email">
    <script>
        var email = document.getElementById("email");
        email.onkeyup = function(event){
            if(event.keyCode = 13){
                var value = this.value.trim();
                var reg = /^[\w]+@[0-9a-z]+\.[a-z]+$/;
                console.log(reg.test(value));
            }
        }
    </script>

6.3.7、密码验证

请输入六位数密码 /^\d {6} $/
账户密码 以字母开头，至少包含五位数字 /^[a-zA-Z]+\d {5,} $/

 <input type="text" placeholder="密码" id="email">
    <script>
        var email = document.getElementById("email");
        email.onkeyup = function(event){
            if(event.keyCode = 13){
                var value = this.value.trim();
               var reg = /^\d{6}$/;
               console.log(reg.test(value));
            }
        }
    </script>

6.3.8、用户名验证

用户名中只能是字母，大小写不限，不能超过八个字符 /^[a-zA-Z] {1,8} $/

<input type="text" placeholder="请输入用户名" id="email"> 
    <script>
        var email = document.getElementById("email");
        email.onkeyup = function(event){
            if(event.keyCode = 13){
                var value = this.value.trim();
                var reg =  /^[a-zA-Z]{1,8}$/
                console.log(reg.test(value));
            }
        }
</script>