[issue33585] re.sub calls repl function one time too many for catch-all regex

[Ville Skyttä]

Change by Ville Skyttä <ville.skytta at iki.fi>:


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components: +Regular Expressions
nosy: +ezio.melotti, mrabarnett

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33585>
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