[issue17426] \0 in re.sub substitutes to space

[anatoly techtonik]

anatoly techtonik added the comment:

FWIW, I reimplemented substitution logic in my wikify [1] engine some time ago. I was kind of disappointed that I have to reinvent the bicycle, but now I see that this was for good. Thanks to people in this report I now understand the whole stuff much better and this will definitely make wikify more useful and easier to use.

1. https://bitbucket.org/techtonik/wikify

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<http://bugs.python.org/issue17426>
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