changed to RSpec's expect syntax

I decided to change clearance to expect syntax for a project I was working on.  If, you want what I did, great!  If, not, you can just close this.

Please note, I have not done a poll request before.  If I have done it incorrectly, I apologize.
please keep the parens around the regex. Without them, ruby generates a warning because it's not 100% sure to what you would like to pass the regex. It's not worth you going and correcting all the places we're currently getting this warning, but I'd like to avoid introducing more.