ruby - 如何使用正则表达式用方括号括起文本？

Question

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，将所有 is 替换为 (is) :

Input is      : This is a long sentence that IS written.
Desired output: This (is) a long sentence that (IS) written.

我该怎么做？ (同时仍然保持找到的字符串的原始大小写)

Answer 1

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"