[issue2650] re.escape should not escape underscore

[Roundup Robot]

Roundup Robot <devnull at devnull> added the comment:

New changeset dda33191f7f5 by Ezio Melotti in branch 'default':
#2650: re.escape() no longer escapes the "_".
http://hg.python.org/cpython/rev/dda33191f7f5

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<http://bugs.python.org/issue2650>
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