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So, tried signing up for Debuggex. Got through the Persona verification process, which gave me a little trouble at first when it went to verify my google account. Said I needed to enable cookies or something, but hitting it again seemed to work. Then the debuggex page tried to transfer me to http://www.debuggex.com/login upon which I see:

Trying in Firefox I get:

Which says:

404 Not Found
The resource could not be found.

predicate mismatch for view login (check_csrf = True) 

The worst problem is, now every time I go back to http://debuggex.com it automatically attempts to log me in, and I get teleported back to the bad gateway. It's like a horrible episode of StarGate.

Was really wanting to give it a try for a regex I was trying to work out tonight.