Clean up username and uuid matchers (#44)
Clean up username and uuid matchers (#44)

Username matcher:
Replaced [a-zA-Z0-9_] with \w, because \w represents the same thing.

UUID matcher:
Replaced (-|) with -?, which means it should be either | or nothing, 
basically the same as (-|).
Removed capturing - in groups, since we don't get it anywhere.
Plancke/hypixel-php