Serhiy Storchaka added the comment:
Here is a patch which reverts 3.1 implementation (and adds some optimization).
Microbenchmark:
$ ./python -m timeit -s "import re" "re._compile('', 0)"
Results:
3.1: 1.45 usec per loop
3.2: 4.45 usec per loop
3.3: 9.91 usec per loop
3.4patched: 0.89 usec per loop
----------
keywords: +patch
Added file: http://bugs.python.org/file27877/re_compile_cache.patch
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<http://bugs.python.org/issue16389>
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