attempt to combine the old format and the new username format

[heiheshang]

my devices connect to branch 0.34 with username user@example.com , now i try to update zotonic but my devices are in different country and i can't update them all at once. i tried to check username format and get hostname

[mworrell]

If I understand correctly then you decide upon the presence of the <<":">> or <<"@">> how to split the username/vhost.

I think this might go wrong on an input like myserver:user@example.com where both a : and @ is in the name, which will give a list of two characters and then crash the match routine.

I think the match routine needs to match on match([?COLON|_], Username)

[heiheshang]

would this be the correct format myserver:user@example.com ? Previously, everything after @ was the name of the server. match in this case will also work incorrectly. I use binary comprehension to get rid of the double application of match