I would recommend:
This way all the others are matched as well.

Did you test this in a new post, or in an existing post?

I have set settings to vbulletin.com - format. It's not working at new posts. I even had rebuild posts cache. I have vbulletin 3.6.4. What should I do?

Solved problem. I deinstalled another product "Amazon Affiliate URL" which interferes with this product.

Interesting.

Glad you figured it out.

I'll take a look at that product, to see the source of the conflict.

Thanks.

there is alot of speculation whether linking to penalized sites could hurt you

I dont know why you think linking to bad sites being a bad thing is a myth, what do we really know about googles algorythms?

If I understand it correctly, he was only referring to Google's Page Rank, not to linking in general.

Doesn't seem to work with my board on 3.6.7.

It's working just fine on 3.6.7..

Well, looking at it it adds the rel="nofollow".

With the external urls it's opening it in the same window when I have it set to open in a new window. Internal urls seem to be working as I have it set to open in the same page, and it's opening in the same window.

So, everything of this hack works for me with the excetion of opening the external urls in a new window.

Actually, scratch that. One of my FireFox plug-ins is conflicting with it. It works in IE, and when I have Tab Mix Plus disabled in FireFox. So, it works, thanks.