http://www.ondotnet.com/pub/a/dotnet/2004/06/14/liberty_whidbey.html

I created a new web-site, opened IIS to set forms authentification on for the new site, created a new page and dragged a CreateUserWizard control on to it. Set the ContinueDestinationPageUrl so that the page posted back to itself. Saved it and ran it. On clicking create user I got an error message.

Password length minimum: 7. Non-alphanumeric characters required: 1.

So I stopped and set the PasswordRegularExpression: [0-9a-zA-Z]{5,10}

Still get the same error message.