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      Question

      What does re.sub(r'(\w+)', r'_\1_', 'hello world')

      return?
      A _hello_ _world_ Correct Answer Incorrect Answer
      B _hello_world_ Correct Answer Incorrect Answer
      C hello world Correct Answer Incorrect Answer
      D _hello_ _world Correct Answer Incorrect Answer

      Solution

      The re.sub() function replaces occurrences of a pattern. Here, (\w+) captures each word. In the replacement string r'_\1_', \1 refers to the content of the first (and only) capturing group. Thus, each word is wrapped with underscores.

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