Analyze Python's re operation method

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1: re.search():search returns the object of the search result, you can use group() or groups () method to get the successfully matched string.

①group() The entire string that matches successfully is returned by default (ignoring the brackets in pattern). You can also specify which character in the brackets to return that matches successfully. String (counting from 1);

②groups() Returns the content in the brackets of the successfully matched pattern in the form of a tuple, if there are no brackets in the pattern , then an empty tuple is returned.

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