This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
Regular expressions are a bad tool for parsing like this. You need a proper parser, and that involves writing a grammar that specifies what is and what isn't allowed. JavaCC or ANTLR can be used for creating this parser.