Raymond Hettinger added the comment:

Yes, I saw that.  If a function could raise a NoCache exception,  re._compile() 
could take advantage of it.  But I don't feel good about going down that path 
(adding coupling between the caching decorator and the cached function).  It 
would be better to keep the lru_cache API simple.  I already made the mistake 
of expanding the API for typed=True just to accommodate a single use case 


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