RedCarpet or alternative that can parse just *- and \s{4}

[Jordon Bedwell]

I was wondering if anybody had any idea if Redcarpet can be convinced easily to only parse code, paragraphs bold and italic or if there was an alternate gem that is just as fast that can be controlled to only allow selective parsing.  I've been reading the docs all night and cannot find any hint of easily filtering what Redcarpet will parse.