According to the Python document[1], any invalid escape sequences in
string literals now generate a DeprecationWarning (SyntaxWarning as of
3.12) and in the future this will become a SyntaxError.
This Change uses Python’s raw string notation for regular expression
patterns to avoid it.
[1]: https://docs.python.org/3.10/library/re.html
Signed-off-by: haoqixu <hq.xu0o0@gmail.com>
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