我一直试图用括号将通过正则表达式找到的一些文本括起来。例如替换全部is with (is) :
Input is : This is a long sentence that IS written.
Desired output: This (is) a long sentence that (IS) written.
我怎样才能做到这一点？ （同时仍然保持找到的字符串的原始大小写）
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"
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