Jscript regular expression for base href

Posted on 2007-11-13
Last Modified: 2012-06-27
Hi X-perts,

I need to fix the following code to return only a base href as "" or "" WITHOUT any dirs

<script type="text/javascript">
      //var base = document.baseURI;
      var base = document.location.href;
      if (base && base.match(/(.*)\/([^\/]+)/)) {
            base = RegExp.$1 + "/";

it works fine, if href is something like, but returns all the subdirs in case href:// etc.

How should i change the reg expression to cut off the subdirs?

Thank you

Question by:andy7789
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LVL 54

Expert Comment

ID: 20275907

Use ...


Let me know if you have any questions or need more information.

LVL 63

Accepted Solution

Zvonko earned 250 total points
ID: 20275945
Check this:

<script type="text/javascript">
      var base = "http://";



Author Comment

ID: 20275968
no it does not work... it returns

 if (base && base.match(/http:\/\/[^\/]+\/?/)) {
base = RegExp.$1 + "/";

it returns base as a simple /
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LVL 54

Assisted Solution

b0lsc0tt earned 250 total points
ID: 20276018
Zvonko's solution is probably better anyways, if you don't mind giving up the expression.   To make my solution work you would either add parentheses (to create the capturing group) or just get the match itself.  I did not see that you needed a group so I left it out (sorry).  I suggest not using the group at all.

var base = document.location.href;
base = base.match(/http:\/\/[^\/]+\/?/);

You don't need the if or to use the group.  Let me know if you have a question or need more info.  That expression will work (and you did want one) but Zvonko's solution is good too. :)


Author Comment

ID: 20276195
Thanks guys!. Both the solutions work perfectly.. just tested on the major browsers. Probably, zvonko's code is simpler (I always hate reg expressions, because I do not know them well :)..)
LVL 54

Expert Comment

ID: 20276274
Your welcome!  I'm glad I could help.  I love regex so when I see it asked for in a question I often overlook other options.  I'm glad Zvonko posted about host so you at least have the option and know about it.

Thanks for the grade, the points and the fun question.


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