STINNER Victor <victor.stin...@gmail.com> added the comment:

> There is good opportunity for optimizing the regular expression. All cases 
> have the literal 'test.test_asyncio.' prefix, and even longer literal 
> prefixes are common for tens cases.

I implemented such code long time ago :-)

https://github.com/haypo/hachoir3/blob/master/hachoir/regex/regex.py

I'm not sure that this code works on Python 3, it was written for Python 2 but 
not only ported to Python 3 partially.

It only supports a subset of regular expressions.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue31324>
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