Problem with the BBCode

[patrixon78]

Hiya.
Just Installed vB and converted database from MyBB 1.6.4a to vB 4.1.6 Publishing Suite.
Now I am struggling with the bbcode in my posts. On my previous forum (MyBB) I've used a hack with [hide] tags to hide links for unregistered users. After conversion is obvious that without hack they don't work but they're still there in over 23000 threads. Is there any way to manage these using some hack from here to make them work again rather than editing every single one and changing the code manually?

Another problem with tags, that in MyBB was for example [align=center] and how to change these to [center] again without editing posts and threads.

Any help will be appreciated.