- Study up on Regular Expressions with the resource of your choice. The Ruby documentation especially. I like the RegExp chapters of Learning Perl
- Test your knowledge with this game: http://teabait.github.io/learn-regex/
- Interactively develop your regular expressions with https://regex101.com/ and http://rubular.com/
- Try these regular expression crossword problems: http://regexcrossword.com/
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