Serhiy Storchaka added the comment:

I'm surprised, but perhaps performance benefit actually exists (check this on 
other computers).

### regex_effbot ###
Min: 0.333525 -> 0.325349: 1.03x faster
Avg: 0.342451 -> 0.331665: 1.03x faster
Significant (t=12.13)
Stddev: 0.00606 -> 0.00651: 1.0738x larger

However the main benefit is that non-cached constructor (re.compile is a 
constructor of regular expression object) is expected to be non-cached, while 
other module level functions can be cached. See for example struct.Struct. We 
can cache non-cached constructor explicitly (as in fnmatch), but when a 
constructor already cached, adding new cache can only add overhead.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue17441>
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