I think this is likely a common problem across the network unless I'm doing things wrong... I do remember a Jeff Atwood blog post discussing the regexes used for the editor but it seems to be that you can't make a single letter in a word bold if you want to.
I was trying to write "SalesForce StackExchange" with the capitals in bold, but it seems you end up with single asterisks surrounding the letter in question, for example:
However, as you can see the italic kicks in instead, leaving the other two asterisks pointing. Is this regarded as a bug, or was it a nice way of handling double pointers in C/C++? ;)