http://rubular.com/ is by far my favorite tool for learning regex. Easy to play around in and you start to pick up patterns as you write your regexes in it.
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That's still my M.O. Stackoverflow plus https://regex101.com plus a few basic tricks are all I've ever needed. Advanced regexes e.g. to validate an email are sophesticated algorithms that I just reach for a library wrapping them
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That's how most people feel about sex
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Using regex on English dictionary helped me internalize some of the rules. The quest to find 9-letter words ending in -ing was incentive enough to learn difference between $ and ^ which always got me. Also domain name shenanigans.. https://visca.com/regexdict/examples/ …
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You and me both
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That way lies madness (Alternatively, "with great power...")
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