使用regex从字符串中提取ip地址

Question

 var r = "\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b"; //http://www.regular-expressions.info/examples.html

var a = "http://www.example.com/landing.aspx?referrer=10.11.12.13";

var t = a.match(r); //Expecting the ip address as a result but gets null

以上是我从字符串中提取ip地址的代码.但它没有这样做.请告知失败的地方.

Answer 1

您已将其定义r为字符串,将其初始化为正则表达式.

var r = /\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b/;

var r = /\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b/; //http://www.regular-expressions.info/examples.html

var a = "http://www.example.com/landing.aspx?referrer=10.11.12.13";

var t = a.match(r);
alert(t[0])