[issue2650] re.escape should not escape underscore

[Ezio Melotti]

Ezio Melotti <ezio.melotti at gmail.com> added the comment:

re.escape and its tests can be refactored in 2.7/3.1, the '_' can be added to the list of chars that are not escaped in 3.3.

I'll put together a patch and fix this unless someone thinks that the '_' should be escaped in 3.3 too.

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assignee:  -> ezio.melotti

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