Automatic links to tickets and changesets

[Cube]

It would be nice if the forum software could automatically link to changesets and tickets, like Trac already does. So if I simply write #837 the forum makes #837 out of it. And the same for rXXX.
I do not know if there is already a suitable plugin for MyBB, but it should be also easy to make one for somebody who knows how MyBB works. It would simplify writing posts very much.