Actually, there is some method to this madness. As part of the process of updating the Ruby book, I realized I needed to spin off some of the larger, non-Ruby related topics. So, at some point, there will be mini-books about HTML and SQL. Regular expressions, as I keep telling people who want to deal with data, are incredibly important, even if you think you never want to learn programming. Hopefully this mini-book will make a strong case for learning regexes.
The second motive is I’ve been looking for a html/text-to-pdf workflow. So this is my experiment with Leanpub, which promises to turn a set of Markdown files into PDF/mobi/etc, while handling the selling process. I don’t expect to sell any copies of the BBoRegexes, but I hope to get a lot of insight about the mechanics behind Leanpub and if it presents a viable way for me to publish my other projects.