试试 bb-ruby 。它的网页上的文档似乎是非常清晰和直接。

So I'm putting together a simple forum. I'd like to allow my users limited formatting options and BBCode would be plenty for my users. Knowing that I'm assuredly not the first one to want to use BBCode with RoR I googled but couldn't find a straight forward tutorial on how to create a editor which accepts BBCode nor a way to parse and display BBCode formatted input.

Any help or guides would be appreciated!

You should give bb-ruby a try. Its documentation on the web page seems to be very clear and straightforward.