Matthew Barnett added the comment:
There are 4 patterns. They try to determine the delimiter and quote by looking
for matches. Each pattern supposedly covers one of 4 cases:
1. Delimiter, quote, value, quote, delimiter.
2. Start of line/text, quote, value, quote, delimiter.
3. Delimiter, quote, value, quote, end of line/text.
4. Start of line/text, quote, value, quote, end of line/text.
On that basis, case 3 looks wrong because the pattern for delimiter is:
>[^\w\n"\']
instead of the expected:
[^\w\n"\']
Looks like a bug to me.
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nosy: +mrabarnett
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<http://bugs.python.org/issue30157>
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