Regex teaser

[Matt Lawrence]

On 04/12/13 10:15, Smylers wrote:
> I agree the behaviour isn't immediately obvious. But it does make sense
> when thinking about what each component means separately.
>
> So what does seem bug-like to me is the Python behaviour — can anybody
> explain that?
>
It looks like Python has decided that a zero-width match cannot 
immediately follow a non-zero-width match. It seems to make zero-width 
matches in other circumstances as expected.

e.g.

$ python -c "import re; print re.sub(r'$', '.', '')"
.

Matt