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![4. Alternation, Groups, and Backreferences - Introducing Regular Expressions [Book]](https://www.oreilly.com/api/v2/epubs/9781449338879/files/httpatomoreillycomsourceoreillyimages1252448.png "4. Alternation, Groups, and Backreferences - Introducing Regular Expressions [Book]")
4. Alternation, Groups, and Backreferences - Introducing Regular Expressions [Book]
