Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

Python's regular expressions are not actually regular. Lookarounds and groups 
make things more complex. Even it it is possible to build an ambiguous graph, 
its size and the time of building can be too large for practical use. Dealing 
with unicode is only minor part of the problem.

I suggest you first to implement this feature as a third-party module on PyPI. 
After this we can consider including it in the stdlib.

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<https://bugs.python.org/issue38660>
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