[issue36714] Tweak doctest 'example' regex to allow a leading ellipsis in 'want' line

[Brian Skinn]

Brian Skinn <bskinn at alum.mit.edu> added the comment:

On reflection, it would probably be better to limit the ELLIPSIS to 3 or 4 periods ('[.]{3,4}'); otherwise, it would be impossible to express an ellipsis followed by a period in a 'want'.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36714>
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