fix(python): fix invalid escape sequences

[e-kwsm]

Description

Regex such as '\d' is invalid, which must be r'\d' or '\\d'.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.98%. Comparing base (416b075) to head (d20901b).
Report is 2 commits behind head on devel.

Additional details and impacted files

@@           Coverage Diff           @@
##            devel    #2987   +/-   ##
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  Coverage   90.98%   90.98%           
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  Files         198      198           
  Lines        8599     8599           
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  Hits         7823     7823           
  Misses        776      776           

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[ChrisThrasher]

Could you please explain what makes these sequences invalid?

[e-kwsm]

See https://docs.python.org/3.13/library/re.html.

The solution is to use Python’s raw string notation for regular expression
patterns; backslashes are not handled in any special way in a string literal
prefixed with 'r'. So r"\n" is a two-character string containing
'' and 'n', while "\n" is a one-character string containing a
newline. Usually patterns will be expressed in Python code using this raw
string notation.

Python 3.13.3 (main, Apr  9 2025, 07:44:25) [GCC 14.2.1 20250207] on linux
>>> s = "\d"   # wrong
<python-input-0>:1: SyntaxWarning: invalid escape sequence '\d'
>>> s = r"\d"  # correct

[horenmar]

@ChrisThrasher The changes are correct.

Honestly it is kinda fascinating that the scripts work, I am surprised that after Python sees the escape is not valid, it just leaves the literal backslash and letter in there.