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The "\2" in r'((.)\2+)' is backreferences, match the same chrarcter as "(.)", which is the second capturing group by count the opening parentheses in regular expression from left to right.
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The "\2" in r'((.)\2+)' is backreferences, match the same chrarcter as "(.)", which is the second capturing group by count the opening parentheses in regular expression from left to right.