For me, the best Regex ressource is still http://regexr.com
It explains what each character does just by hovering over a regex. Best tool to learn or to fine tune your regular expression (with testing included).
It explains what each character does just by hovering over a regex. Best tool to learn or to fine tune your regular expression (with testing included).
You can even step through the matching process and see how your matches are made
It will also do things like warn you if you use named groups if your selected language doesn't support them, and the "Use" dropdown won't provide that option.
I really wish it wasn't Windows only.
I generally use https://regex101.com for its display of matched groups (when I'm dealing with complex groups and/or replacement backreferences), and http://regexstorm.net/tester when I specifically need to check a regex that will be running in .NET or Powershell.
The book is worth it's price if only for chapter 1, definitely seconding this recommendation.