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

@Tim: the regex module includes some extra checks to reduce the chance of 
excessive backtracking. In the case of the OP's example, they seem to be 
working. However, it's difficult to know when adding such checks will help, and 
your example is one case where they are being done but aren't helping, with the 
result that it's slower.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue31759>
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