Managing Old URLs

I recently change subdomains on a site and a member brought up an issue with some very old URLs not working. These are from when the site was running vBulletin v2.x and had it's own rewrite software. Following are more details

Some old links are not working and we need to see if we can determine a way to rewrite them to work. Here is a link to a page that has an old style link:
U2 Feedback - View Single Post - *Frequently Posted U2 Stuff - LOOK HERE Before Starting a New Thread*

It seems there was some SEO software in place in the past that had URLs that looked like this:
http://u2.interference.com/t166966.html

Now the new URL should be:
http://u2.interference.com/f189/merg...ptions-u2-com-166966.html

In the above example the only item that vBSEO is really looking for is the dash thread ID (ex. -166966.html). All the rest of the URL is just there for optimization. Do you know how if it's possible to extract this thread ID from the old URLs, com/t166966.html then create a replacement variable or some other thing so the old URLs will be changed to point to the new URLs?

Thanks in advance for your help and suggestions.

Hello,

you can put this in .htaccess file right after "RewriteEngine on" line:

Code:

RewriteRule ^t([0-9]+)\.html vbseo.php?vbseourl=showthread.php&t=$1 [L]

nvrmnd