正则表达式中的反向预搜索(下)

//程序目的，去掉图片路径中的域名
var str = '<img src="//www.VeVB.COm/images/logo.gif">';
var reg1 = /(/<img)(.*(?=(http|https)/:////))((http|https)/:////[^//]*)/gim;
str.match(reg1);
alert(str.replace(RegExp.$4,'');

var str = '<img src="//www.VeVB.COm/images/logo.gif">武林网首页的<a href="//www.VeVB.COm">链接</a>';

//与贪婪匹配的差别就是多了一个问号“?”，贪婪".*",非贪婪".*?"
var reg1 = /(/<img)(.*?(?=(http|https)/:////))((http|https)/:////[^//]*)/gim;