Changes

fix "SyntaxWarning: invalid escape sequence '\('"

This is a new warning introduced in Python 3.12:

https://docs.python.org/dev/whatsnew/3.12.html#other-language-changes

Python 3 interprets string literals as Unicode strings, and so '\('
is treated as an escaped Unicode character.  Fix this by prefixing
the regexp strings with 'r' and thus converting them to raw strings.

Change-Id: I7a9f546dc7cdf9bc250516a58f35b50b46017dc3