As shown by the screenshot below, the text box that holds the description of books gets cut off and stops me from reading it.
Thanks for letting us know about this problem. This is a problem with the markup of this specific description; we'll fix it.
Also, if you're interested in Mastering Regular Expressions, you may want to check out the 3rd edition at http://shop.oreilly.com/product/97805... This is the most current edition.