[issue5337] Scanner class in re module undocumented

[Michael Foord]

Michael Foord <michael at voidspace.org.uk> added the comment:

Whether it was intended to be exposed or not it is known and used - and
therefore we can't change the API without going through the usual
deprecation process. As it is used and useful it should be documented.

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<http://bugs.python.org/issue5337>
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