使用正则表达式从字符串中提取IP地址 [英] Extract ip address from a string using regex

问题描述

 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

上面是我的代码，用于从字符串中提取IP地址. 但是它没有这样做. 请告知失败的地方.

The above is my code to extract ip address from a string. But it fails to do so. Kindly advice where it fails.

推荐答案

您已将r定义为字符串，并将其初始化为正则表达式.

You have defined r as string, initialize it as regular expression.

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])

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