Karthikeyan Singaravelan <tir.kar...@gmail.com> added the comment:

> There were ideas for exotic matchers such as IsInstance(), InRange(), 
> RegexMatchingGroup() and so on.

https://www.python.org/dev/peps/pep-0622/#custom-matching-protocol

The PEP has some mention about a similar use case in custom match protocol 
section.

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nosy: +xtreak

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