bayes ignore {spam} tag in subject line

[Bingham, Ryan]

I apologize if this is a dumb question but I haven't been able to find
the answer anywhere.  Is there a way to get Bayes to ignore the {spam}
tag in the Subject line (without ignoring the entire Subject line)?
Alternatively, is there an easy way to remove/replace a text string i.e.
{spam} from all the messages in an mbox file?

I'd like to have Bayes learn messages in my low scoring spam mailbox
after I've cleaned out the false positives.

Thanks,

Ryan