[issue37858] CookieLib: MozillaCookieJar.py uses case-sensitive regex to validate cookies file

[Ashley Harvey]

Change by Ashley Harvey <machone at gmail.com>:


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versions: +Python 3.5, Python 3.6, Python 3.7, Python 3.8, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37858>
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