[issue26302] cookies module allows commas in keys

[Anish Shah]

Anish Shah added the comment:

@serhiy.storchaka OK, I have used re.escape instead of '\'. And I have added a test too.

Also, may I know why '\' can not be in _LegalChars, so that I can remember this for future purpose?

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Added file: http://bugs.python.org/file41837/issue26302_20160206-2.patch

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