[issue7940] re.finditer and re.findall should support negative end positions

[Ezio Melotti]

Ezio Melotti <ezio.melotti at gmail.com> added the comment:

> Are there any real world examples which show the benefit of supporting 
> negative indices?

A common case is ignoring parentheses at the beginning/end, e.g.
>>> re.compile('[^,]+').findall('(foo,123,(),bar)')
['(foo', '123', '()', 'bar)']
>>> # ignore the surrounding ()
>>> re.compile('[^,]+').findall('(foo,123,(),bar)', 1, 15)
['foo', '123', '()', 'bar']
>>>
>>> # extract attributes from a tag (poc, doesn't handle all cases)
>>> re.compile('[^ ]+').findall('<input type="checkbox" id="foo" checked>', 7, 39)
['type="checkbox"', 'id="foo"', 'checked']

In both cases using -1 as endpos is simpler.

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versions: +Python 3.9 -Python 3.5

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<https://bugs.python.org/issue7940>
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