jQuery利用正则表达式验证url地址

 var Expression = '^((https|http|ftp|rtsp|mms)?://)?'
            +'(([0-9a-z_!~*().&=+$%-]+: )?[0-9a-z_!~*().&=+$%-]+@)?' //ftp的user@
            +'(([0-9]{1,3}.){3}[0-9]{1,3}|'// IP形式的URL- 199.194.52.184
            +'([0-9a-z_!~*()-]+.)*'// 域名- www.
            +'[a-z]{2,6})'//域名的扩展名
            +'(:[0-9]{1,4})?'// 端口- :80
            +'((/?)|(/[0-9a-z_!~*().;?:@&=+$,%#-]+)+/?)$'; 
        
        var objExp=new RegExp(Expression);

        if(objExp.test(str) != true){
            alert("网址格式不正确！请重新输入");
        } else {
            alert("网址正确！");
        }

测试用例

参考网址：https://www.cnblogs.com/diantao/p/5191412.html

2简单形式的验证

var reg =/[a-zA-z]+:\/\/[^\s]*/;