Amaury Forgeot d'Arc added the comment:
Anatoly, your last question about re.sub is covered by the documentation:
re.sub will process the replacement string, and interpret the sequence \ 0 as
the NUL character. So you get the NUL character in the returned string.
This is unrelated to raw literal strings.
And yes, sometimes you need 4 backslashes to get one in the output:
>>> print(re.sub("b", "\\\\", "abc"))
a\c
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nosy: +amaury.forgeotdarc
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