Matthew Barnett <pyt...@mrabarnett.plus.com> added the comment:

The expression is a repeated alternative where the first alternative is a 
repeat. Repeated repeats can result in a lot of attempts and backtracking and 
should be avoided.

Try this instead:

    (0|1(01*0)*1)+

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46825>
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