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Regex: Alternation (|)
MediumRegular Expressions5-10 minThe brief
Extract lines mentioning either 'cat' or 'dog' from /root/work/pets.txt into /root/work/out.txt.
A line counts if it contains either word.
What you'll do
- out.txt holds exactly the lines containing 'cat' or 'dog'
Hands-on lab: you work on a real Linux box in your browser, graded on the machine's actual state.