Serhiy Storchaka added the comment:

This is not only 3.3 regression, this is also 3.2 regression. 3.1, 3.2 and 3.3 
have different caching implementation.

Mikrobenchmark:
$ ./python -m timeit -s "import re"  "re.match('', '')"

Results:
3.1: 2.61 usec per loop
3.2: 5.77 usec per loop
3.3: 11.8 usec per loop

----------
keywords: +3.2regression
nosy: +serhiy.storchaka

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue16389>
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