[issue2650] re.escape should not escape underscore

[Roundup Robot]

Roundup Robot <devnull at devnull> added the comment:

New changeset 1402c719b7cf by Ezio Melotti in branch '3.1':
#2650: Refactor the tests for re.escape.
http://hg.python.org/cpython/rev/1402c719b7cf

New changeset 9147f7ed75b3 by Ezio Melotti in branch '3.1':
#2650: Add tests with non-ascii chars for re.escape.
http://hg.python.org/cpython/rev/9147f7ed75b3

New changeset ed02db9921ac by Ezio Melotti in branch '3.1':
#2650: Refactor re.escape to use enumerate().
http://hg.python.org/cpython/rev/ed02db9921ac

New changeset 42ab3ebb8c2c by Ezio Melotti in branch '3.2':
#2650: Merge with 3.1.
http://hg.python.org/cpython/rev/42ab3ebb8c2c

New changeset 9da300ad8255 by Ezio Melotti in branch 'default':
#2650: Merge with 3.2.
http://hg.python.org/cpython/rev/9da300ad8255

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nosy: +python-dev

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