Upvoting indicates when questions and answers are useful. The first backslash in your string is being interpreted as a special character. What's reputation and how do i get it?
You'll need to complete a few actions and gain 15 reputation points before being able to upvote. In fact, because it's followed by a u, it's being interpreted as the start of a unicode code point. Instead, you can save this post to reference later.
To fix this, you need to escape the backslashes in the string.