Open Local links in same window, External in new window

[admin]

I did search for a easy solution to simply open a local link in the same window, and external links in a new window.

Did not find it, so I did make this. My first PHP script.

In the file:
includes/class_bbcode.php

Search for: standard URL hyperlink
Replace:

return "<a href=\"$rightlink\" target=\"_top\"" . ($is_external ? ' rel="nofollow"' : '') . ">$text</a>";

With:

    if( is_int(  strpos(  strtolower( $text ), "InsertYourDomainHere") ) )

    {
    $insert = false;
        return "<a href=\"$rightlink\" target=\"_top\"" . ($is_external ? ' rel="nofollow"' : '') . ">$text</a>";
    } else {
        return "<a href=\"$rightlink\" target=\"_blank\"" . ($is_external ? ' rel="nofollow"' : '') . ">$text</a>";
    }

InsertYourDomainHere = Should be replaced with your domain eg: vbulletin (exclude the last part of your domain eg .com / .org)
It didn´t work for me anyway.
Maybe because of vbulletin cutting down long texts? I dont really now.

And then update the CMS Cache.
AdminCP - vBulletin CMS - Clean CMS-Cache

However this works perfect for me.