IMO, learning RegEx is no more difficult that learning most programming languages, like JavaScript. In fact, I'd argue that you can develop solutions to common problems with a modest amount of effort. And, a real productivity benefit, is that the KM Actions for "Search" and "Replace" allow you to easily use RegEx with KM Variables.
Whether or not you want a physical book most likely depends on each person's learning style and preferences. And, I don't find learning on the Internet to be necessarily "haphazard". There are a number of excellent RegEx tutorials that are very methodic -- as good as most books. There are even some online training courses that are much better than just a book. I have used a number of StackStills.com courses, and find them excellent. I have not used this course, but here are some examples: The Complete Regular Expressions Course with Exercises Go from Zero to Expert in Building Regular Expressions
BTW, I have NEVER paid the full advertised price for StackSkills courses. If you do some searching you should find some major discounts, like 80-90% discount.
Actually, I find most books to be good as references, but not necessarily for learning, unless the book is specifically designed as a text book.
If you don't like the approach of the RegEx tutorial I suggested, Regular Expressions Quick Start, then do a search on "regular expression tutorial" and you will find a number of choices.
A Google search on "regular expression training" found these web sites, and many more.
If none of the below appeal to you, then do the search to find one that does.
Hi @ronald, you’ve clicked on the wrong link. @JMichaelTX was directing you to a udemy course but somehow you’ve pursued the path to purchase the RegexBuddy software. (It is indeed Windows-only.)
BTW, when I used Windows (a while ago now) I bought copies of both RegexBuddy and RegexMagic and found them really useful. On the Mac I use RegExRX all the time in preference to web-based sites. It’s not so great for learning regex but it works for me... YMMV.
