Computer scienceProgramming languagesPythonPython librariesRegular expressions

Groups and alternations

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For instance, you have the following pattern r'([Dd]ogs?)|([Cc]ats])'and the following string 'Dogs are the best!'. As you can see the string matches only the first group of the regexp pattern. What happens if you pass the groups()method on the result?

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It will return a tuple with the first group equal to None

It raises an error

It returns None

It returns an empty string

It will return a tuple with the second group equal to None

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