py.user added the comment:
Tim Peters wrote:
> Should that raise an exception?
>i += 0
>(?=a)b
>(?=a)a
These are another cases. The first is very special. The second and third are
special too, but with different contents of assertion they can do useful work.
While "(?=any contents){N}a" never uses the "{N}" part in any useful manner.
> So I think this report should be closed
I looked into Perl behaviour today, it works like Python. It's not an error
there.
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<http://bugs.python.org/issue14460>
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