Permalinks with capital letters

Nice idea, thanks.

I converted my links in permalinks to something like this:

forum-1

Now i need to convert something like this with permalink normalizations:

forum-Aba-dasda-1

I’m trying with this but it doesn’t work.

/forum-[A-Za-z-]+([0-9]+)./forum-\1

Edit: Working version

/forum[A-Za-z-]+([0-9]+).*/forum\-\1

Now I have problem with polish letters like: ĄąĆćĘęŚśŹźŻżÓó

When I tried this version:

/forum[A-Za-z\Ą\ą\Ć\ć\Ę\ę\Ś\ś\Ź\ź\Ż\ż\Ó\ó-]+([0-9]+).*/forum\-\1

it couse error on site: