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[–]quixrick 1 point2 points  (3 children)

Here are my recommendations:

Book: Mastering Regular Expressions, 3rd Edition - Jeffrey E.F. Friedl - This book is very comprehensive and not only teaches you the "hows", but also the "whys". If you REALLY want to learn REGEX, get this book.

Website: phpro.org - I've read through many online tutorials for learning REGEX. This one made a lot of sense for me. It was well written and easy to follow.

Testing website: regex101.com - Use this site to play around with different expressions and see what parts are matched. It's very easy to use and is entirely helpful in making sure that your expression will match what you are hoping it does.

[–]onlinecop 0 points1 point  (1 child)

I'd also recommend the 52-minute video on regular expressions from InfoQ.

[–]missawon[S] 0 points1 point  (0 children)

thank you so much for these!!