[issue2650] re.escape should not escape underscore

[Benjamin Peterson]

Benjamin Peterson <musiccomposition at gmail.com> added the comment:

Thanks.

The loop in escape should really use enumerate instead of "for i in
range(len(pattern))".

Instead of using a loop, can't the test just use
"self.assertEqual(re.esacpe(same), same)?" Also, please add tests for
what re.escape should escape.

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