gh-91524: Speed up the regular expression substitution (#91525)
Functions re.sub() and re.subn() and corresponding re.Pattern methods
are now 2-3 times faster for replacement strings containing group references.
Closes #91524
Primarily authored by serhiy-storchaka Serhiy Storchaka
Minor-cleanups-by:
Gregory P. Smith [Google] <greg@krypto.org>
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