regex warnings in MsftLinuxPatchCore.py?

Bắt đầu trong MsftLinuxPatchCore.py tại các dòng 7451, 7468 và 7476, sau đó tái hiện sự cố trên một Azure VM chạy Ubuntu 24.04 trong khi theo dõi nhật ký của extension. Xác minh rằng việc xử lý regex bị ảnh hưởng không còn phát cảnh báo về chuỗi escape không hợp lệ trong quá trình khởi động LinuxPatchExtension.

Describe the bug
I see the following in my journalctl logs:

Aug 22 00:36:41 sr-monitor systemd[1]: Starting MsftLinuxPatchAutoAssess.service - Microsoft Azure Linux Patch Extension - Auto Assessment...
Aug 22 00:36:41 sr-monitor bash[143561]: /var/lib/waagent/Microsoft.CPlat.Core.LinuxPatchExtension-1.6.62/MsftLinuxPatchCore.py:7451: SyntaxWarning: invalid escape sequence '\_'
Aug 22 00:36:41 sr-monitor bash[143561]:   """ Fetches pid from the error message by searching for the text 'pid' and returns the process tree with all details.
Aug 22 00:36:41 sr-monitor bash[143561]: /var/lib/waagent/Microsoft.CPlat.Core.LinuxPatchExtension-1.6.62/MsftLinuxPatchCore.py:7468: SyntaxWarning: invalid escape sequence '\d'
Aug 22 00:36:41 sr-monitor bash[143561]:   regex = re.compile(' pid \d+')
Aug 22 00:36:41 sr-monitor bash[143561]: /var/lib/waagent/Microsoft.CPlat.Core.LinuxPatchExtension-1.6.62/MsftLinuxPatchCore.py:7476: SyntaxWarning: invalid escape sequence '\d'
Aug 22 00:36:41 sr-monitor bash[143561]:   regex = re.compile('\d+')

Is this a bug?

To Reproduce
Steps to reproduce the behavior:

1. Create Azure Ubuntu VM
2. Enable LinuxPatchExtension
3. Watch the logs

Expected behavior
No regex warnings

Screenshots
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Desktop (please complete the following information):

• OS: ubuntu
• Browser N/A
• Version 24_04-lts

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
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