[issue31677] email.header uses re.IGNORECASE without re.ASCII

[Barry A. Warsaw]

Barry A. Warsaw <barry at python.org> added the comment:

On Oct 3, 2017, at 23:51, INADA Naoki <report at bugs.python.org> wrote:
>> It's better to keep the re.IGNORECASE since the RFC also says:
>> 
>>  Both 'encoding' and 'charset' names are case-independent.  Thus the
>>  charset name "ISO-8859-1" is equivalent to "iso-8859-1", and the
>>  encoding named "Q" may be spelled either "Q" or "q".
> 
> I'm sorry, I've committed before reading this.
> But I think it's not problem, because re.IGNORECASE doesn't affect to
> "(?P<charset>[^?]*?)" pattern.

I think you’re change is fine, no need to revert or modify it.

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<https://bugs.python.org/issue31677>
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