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what are the implementation details and guarantees of Python regular expressions?

April 26, 2017expressions guarantees Implementation Python regular

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what are the implementation details and guarantees of Python regular expressions?

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It would also be nice if someone could give some sort of explanation (in light of the implementation) as to why the regular expressions “cat|catdog” and “catdog|cat” lead to different search results in the string “catdog”, as mentioned in the question that I referenced before.