[issue12162] Documentation about re \number

[R. David Murray]

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

The fact that you have carefully think about which are escapes and which aren't tells you that you should not be depending on the non-escapes not being escapes.  What if we added one?  The doc says preserving the \s is a debugging aid, and that is all it should be used for, IMO.

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<http://bugs.python.org/issue12162>
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