[issue18685] Restore re performance to pre-PEP393 level

[Matthew Barnett]

Matthew Barnett added the comment:

With the patch the results are:

C:\Python34\python.exe -m timeit -s "import re; f = re.compile(b'abc').search; x = b'x'*100000" "f(x)" 
10000 loops, best of 3: 113 usec per loop

C:\Python34\python.exe -m timeit -s "import re; f = re.compile('abc').search; x = 'x'*100000" "f(x)" 
10000 loops, best of 3: 113 usec per loop

C:\Python34\python.exe -m timeit -s "import re; f = re.compile('abc').search; x = '\u20ac'*100000" "f(x)" 
10000 loops, best of 3: 113 usec per loop

I'm most impressed! :-)

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<http://bugs.python.org/issue18685>
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