Javascript error: Invalid regular expression flags

So I have an error in my code that's saying Invalid regular expression flags. The line at fault is this one: ctx.drawImage(/Users/aUser/Desktop/NightSquare.png, 200, 200);, but aUser is replaced with my actual name (changed for privacy). I'm running on a mac and I think I know what the problem is (I didn't include MacIntosh HD), but I'm not sure. How do I fix this?
Additional notes: The /Users/ part of the code is highlighted in red in my text editor (the same color as a string).