Gareth Rees added the comment:
This is the usual exponential backtracking behaviour of Python's regex engine.
The problem is that the regex
(?:[^*]+|\*[^/])*
can match against a string in exponentially many ways, and Python's regex
engine tries all of them before giving up.
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nosy: +g...@garethrees.org
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30973>
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