js正则表达式获取字符串中的URL链接

function httpString(s) {
        var reg = /(http:\/\/|https:\/\/)((\w|=|\?|\.|\/|&|-)+)/g;
        //var reg = /^(https?:\/\/)?([\da-z\.-]+)\.([a-z\.]{2,6})([\/\w \.-]*)*\/?$/;
        //var reg=/(http(s)?\:\/\/)?(www\.)?(\w+\:\d+)?(\/\w+)+\.(swf|gif|jpg|bmp|jpeg)/gi;
        //var reg=/(http(s)?\:\/\/)?(www\.)?(\w+\:\d+)?(\/\w+)+\.(swf|gif|jpg|bmp|jpeg)/gi;
        var reg= /(https?|http|ftp|file):\/\/[-A-Za-z0-9+&@#/%?=~_|!:,.;]+[-A-Za-z0-9+&@#/%=~_|]/g;
        //var reg= /^((ht|f)tps?):\/\/[\w\-]+(\.[\w\-]+)+([\w\-\.,@?^=%&:\/~\+#]*[\w\-\@?^=%&\/~\+#])?$/;
        //v = v.replace(reg, "<a href='$1$2'>$1$2</a>"); //这里的reg就是上面的正则表达式
        //s = s.replace(reg, "$1$2"); //这里的reg就是上面的正则表达式
        s = s.match(reg);
        console.log(s)
        return(s)
    }
 
httpString('https://bbs.csdn.net/topics/390385404')