[issue34982] re.sub() different behavior in 3.7

[Stephan Bergmann]

Stephan Bergmann <stephan.bergmann.secondary at googlemail.com> added the comment:

So, just to make sure, that also means that

  re.sub('a*$', 'b', 'a')

returning 'bb' instead of 'b' is intended behavior?

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nosy: +Stephan Bergmann

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<https://bugs.python.org/issue34982>
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