url rewrite from xf

[Afrika]

I try to change back from xenforo to vb.
Now I have to rewrite the urls like:
domain.com/threads/text-text-text.11705/ to forum.php?threadid=11705
domain.com/threads/text-bla-text.11707/ to forum.php?threadid=11707
How to generate the rule in the .htaccess?

[AusPhotography]

I'd do an edit in the database, using REPLACE

[Black Snow]

I'd do an edit in the database, using REPLACE

Same. I'd do a database backup then attempt a REPLACE function but i'd assume it would require a few lines to grab the url, strip our the thread ID number, then replace threads/text-text-text. with forum.php?threadid=. You can always restore your backup if it doesn't work.

[cellarius]

That won't help you for external incoming links.