Invalid escape sequence error on AUR install

[rcorre]

Describe the Bug:
I tried to install pacback via yay -S pacback, and got the following error:

(1/1) installing pacback                                                          [###############################################] 100%
/usr/share/pacback/core/paf/linux.py:117: SyntaxWarning: invalid escape sequence '\$'
  return re.sub("(!| |\$|#|&|\"|\'|\(|\)|\||<|>|`|\\\|;)", r"\\\1", astr)
/usr/share/pacback/core/utils.py:84: SyntaxWarning: invalid escape sequence '\d'
  r = re.split("\d+-\d+|\d+(?:\.\d+)+|\d:\d+(?:\.\d+)+", p)[0]
Critical Error! Pacback Already Has An Active Session Running.
Optional dependencies for pacback
    pigz: Multithreaded de/compression of custom user files
:: Running post-transaction hooks...

It seemed to install. Note that I've never run or installed pacback before

Output of Command

• Output sent to the user in terminal
• Log output in /var/log/pacback.log
• Config file in /etc/pacback/config

Machine (please fill in the following information):

• Kernel Version: (uname -r): 6.13.2-arch1-1
• Python Version: (python3 --version): Python 3.13.1
• Python Rich Version (pacman -Q | grep python-rich): python-rich 13.9.4-3
• Python Requests Version (pacman -Q | grep python-requests): python-requests 2.32.3-4
• Pacback Version: (sudo pacback -v): Pacback Version: 2.1.0 PAF Version: 412fd69
• Install Type: (pacback vs pacback-git): pacback

To Reproduce Steps to reproduce the behavior:

1. yay -S pacback

Expected behavior No errors on install.

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Additional context Add any other context about the problem here.