title: How do I get a cursor on every line in vscode
body: <p>I'm trying to use the multi cursor functionality of vscode on a large(ish) file.
  the file is too large to select every line individually with ctrl-alt-up or down. In sublime-text I would select everything and push ctrl-shift-l. Is there a similar thing in vscode. I've tried using a regex search for ^, but that gives me an error stating "Expression matches everything". </p>