Use the CreateUserWizard.PasswordRegularExpression property to define the requirements for passwords used to validate users on your Web site. A common use is to make sure that a user has included symbols other than letters in a password to make it harder for attackers to guess a password. The regular expression is used in addition to any restrictions placed on the password by the membership provider specified in the CreateUserWizard.MembershipProvider property. If the membership provider rejects the password for any reason, the text contained in the CreateUserWizard.InvalidPasswordErrorMessage property is displayed.

If the password entered does not pass the regular expression, the error message contained in the CreateUserWizard.PasswordRegularExpressionErrorMessage property is displayed to the user.