Ralf Schmitt added the comment:
here is an example (from http://swtch.com/~rsc/regexp/regexp1.html)
python -c 'import re; num=25; r=re.compile("a?"*num+"a"*num);
r.match("a"*num)'
At work I have seen a real world case of a regular expression which ran
for minutes rendering the application unresponsive. We would have been
glad to be able to interrupt the regular expression engine and getting a
traceback.
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nosy: +schmir
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<http://bugs.python.org/issue846388>
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