[issue2650] re.escape should not escape underscore

[Russ Cox]

New submission from Russ Cox <rsc at swtch.com>:

import re
print re.escape("_")

Prints \_ but should be _.

This behavior differs from Perl and other systems: _ is an identifier
character and as such does not need to be escaped.

----------
messages: 65585
nosy: rsc
severity: normal
status: open
title: re.escape should not escape underscore
type: behavior
versions: Python 2.5

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