如何在javascript中使用正则表达式获取基本URL

Question

My app is going to work in multiple env, in which i need to get the common value (base url for my app) to work across..

from my window location how to i get certain part from the start..

example :

    http://xxxxx.yyyy.xxxxx.com:14567/yx/someother/foldername/index.html

how can i get only:

http://xxxxx.yyyy.xxxxx.com:14567/yx/

my try :

var base = \w([yx]/)

the base only select yx/ how to get the value in front of this?

this part..

thanks in advance..

Answer 1

If 'someother' is known to be the root of your site, then replace

    \w([yx]/)

with

    (.*\/)someother\/

(note that the / characters are escaped here) which gives a first match of:

   http://xxxxx.yyyy.xxxxx.com:14567/yx/

However, a regular expression may not be the best way of doing this; see if there's any way you can pass the base URL in by another manner, for example from the code running behind the page.

Answer 2

If you don't mind disregarding the trailing slash, you can do it without a regex:

var url = 'http://xxxxx.yyyy.xxxxx.com:14567/yx/someother/foldername/index.html';

url.split('/', 4).join('/');
//-> "http://xxxxx.yyyy.xxxxx.com:14567/yx"

If you want the trailing slash, it's easy to append with + '/' .

Answer 3

请尝试以下正则表达式：

http\:\/\/[\w\.]+\:\d+\/\w+\/

Answer 4

这个应该做得很好

http:\/\/[\w\.]+\:\d+\/\w+\/

Answer 5

Perhaps something like this?

Javascript

function myBase(url, baseString) {
    if (url && baseString) {
        var array = url.split(new RegExp("\\b" + baseString + "\\b"));

        if (array.length === 2) {
            return array[0] + baseString + "/";
        }
    }

    return null;
}

var testUrl = "http://xxxxx.yyyy.xxxxx.com:14567/yx/someother/foldername/index.html",
    testBase = "yx";

console.log(myBase(testUrl, testBase))

;

Output

http://xxxxx.yyyy.xxxxx.com:14567/yx/ 

On jsfiddle