I see, I must have miss the line at that time, while I desperately wanted to match the newline without looking. But I didn't know that this behavior is normal for CLI tools like `grep` or `sed`, since many editors like `gedit` or `vim` match newlines per default (a behavior I actually expected).
Because this post is quite old already, I even forgot this issue myself, so, since this seems to be rather a feature than an issue, I'll just close this issue for good then. But nevertheless, thank you for the insight of this option and sorry for triggering this as an issue.