[perlgeek]

> My later books were much better books but sold fewer and fewer copies.

This resonates with me. I've written and published a few books, and the one I'm most proud of has sold the last.

https://www.amazon.com/dp/1484232275/ has a 5.0 star rating on Amazon (at 20 ratings), and I've gotten lots of positive feedback about it via email, chat and in person. The topic is just so niche that virtually nobody cares :-)

[bornfreddy]

(I apologize in advance for offering unsolicited advice)

As someone who is interested in the topic of regexes and parsing, Perl in the subject made me... uninterested. I know this is a sample of size 1, but maybe splitting the principles / theory from the language would make sense?