[docs] [issue12162] Documentation about re \number

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

Read the description of strings and raw strings at the top of the re documentation for the answer to your question about \\.  It would probably be better if the example regular expression was written r'(.+) \1' instead of as a bare expression as it is now.

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nosy: +r.david.murray

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