Grooveshark Chat Auto-hyperlinks (July 22, 2014)

URLs:
arbitrary.grooveshark.com
grooveshark.com/arbitrary
wikipedia.org
facebook.com
twitter.com
musicbrainz.org
itunes.apple.com
amazon.com
play.google.com
vimeo.com
youtube.com
pinterest.com
ustream.com
reddit.com
twitch.tv
kickstarter.com
indiegogo.com
cl.ly
ballercast.com
flattr.com
youtu.be
soundcloud.com

Regex:
(https?:\/\/)?(((?:[a-z0-9\-]+\.)*(?:urlfromabove))(/[a-z0-9_&=%#!;,\+\-\?\.\~\[\]\/]+)?)