My pet peeve with technical books is unintentional filler - things you can learn within minutes by googling it and easily amount to 50%+ of most books. Show me the obscure API workarounds and tricks that will take me weeks to find out instead.
Excellent. Worked for me. The output can modified but this provide a great start. I do regex so seldom I can't remember notation for lookahead for example which this provides.