Terry J. Reedy <tjre...@udel.edu> added the comment:

To me, it is plausible but not slam-dunk obvious that preloading ascii to 'x' 
mappings will make ascii lookup faster.

On #21765, where the pyparse special translation was a side-issue, Tal Einat 
claimed that the unpublished regex he tried was 100x slower.

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<https://bugs.python.org/issue32940>
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