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更新时间：2023-02-17 22:08:25
irb(main):001:0> s = 'This is a long sentence that IS written.'
=> "This is a long sentence that IS written."
irb(main):002:0> s.gsub(/\bis\b/i, '(\0)')
=> "This (is) a long sentence that (IS) written"
irb(main):003:0> s
=> "This is a long sentence that IS written"
irb(main):004:0> s.gsub!(/\bis\b/i, '(\0)')
=> "This (is) a long sentence that (IS) written"
irb(main):005:0> s
=> "This (is) a long sentence that (IS) written"