Yeah, it's true, you don't need to double the backslash if they are enclosed in single quotes or q(), however if the backslash happens to be the last character in the string, then it must be double. So, it's just easier to remember to always double it.
Incorrect: 'C:\Windows\'
Correct: 'C:\Windows\\'
Incorrect: q(C:\Windows\)
Correct: q(C:\Windows\\)
This is easier to rememeber: 'C:\\Windows\\' or "C:\\Windows\\"
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