Steven D'Aprano <steve+pyt...@pearwood.info> added the comment:
Remember that backslash escapes are only a Python syntactic feature. If you
read data from a file, or from the input() builtin, that contains a backslash,
it remains a backslash:
>>> s = input()
a\b
>>> print(len(s), s == r'a\b')
3 True
Backslashes are only special in two cases: as source code, and when displaying
a string (or bytes) using `repr`.
So if you get a regex from the user, say by reading it from a file, or from
stdin, or from a text field in a GUI, etc. and that regex contains a backslash,
your string will contain a backslash and you don't need anything special.
Does this solve your problem?
----------
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue44308>
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