The password for the anonymous Web User account can be configured to validate in one of the following ways:
No Validation
Regardless of what is entered for the password, it is not validated.
Valid Email Address
The password is validated to ensure that it follows a [name]@[domain].[extension] syntax (for example, jsmith@example.com).
Regular Expression
The Regular Expression option allows you to customize how the password is validated. Selecting this option requires that you specify a Password Regular Expression. For example, a value of .+@example.com would require a user to specify a password that ends with @example.com.