Hi,
while reviewing urllib.parse i noticed a pretty ugly pattern
many functions had an attached global and in their own code they would compile an regex on first use and assign it to that global
its clear that compiling a regex is expensive, so having them be compiled later at first use would be of some benefit
but instead of all that reptetive code there should be an alternative to re.compile that waits with compilation for the first use
-- Ronny
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