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- r0 = /\d+/
- r1 = /^\d+$/
- p r0.match("123")
- # => #<MatchData "123">
- p r1.match("123")
- # => #<MatchData "123">
- p r0.match("s1m0n3")
- # => #<MatchData "1">
- p r1.match("s1m0n3")
- # => nil
- # for fun
- p "123".to_i
- # => 123
- p "s1m0n3".to_i
- # => 0
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