[issue18685] Restore re performance to pre-PEP393 level

[Roundup Robot]

Roundup Robot added the comment:

New changeset 66e2dfbb1d70 by Serhiy Storchaka in branch 'default':
Issue #18685: Restore re performance to pre-PEP 393 levels.
http://hg.python.org/cpython/rev/66e2dfbb1d70

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nosy: +python-dev

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