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A Case Network ID or Case ID (also called "Case Email ID", "Case Username", "Login ID", "CWRUnet ID", and other similar names) uniquely identifies a user of the Case network. Case IDs consist of three letters, optionally followed by numeric digits. The Case ID is used to log in to protected services and also serves as a Case email address, although your firstname.lastname@case.edu e-mail address is preferred by ITS.

Tools to manage your Case Network ID are available at https://its-services.case.edu/my-case-identity/.

ITS policy recommends that Case IDs not be used as a publicly viewable identifiers on web sites. It is preferred to use a real name (obtainable from LDAP) instead. The reasoning behind this is that your Case ID is a secret, like your password. However, this fails to take into account that you can't change your Case ID, Case IDs are based on your name, and, currently, publically available in LDAP. This may be an excuse for people to use the "firstname.lastname" email addresses that no doubt took a large amount of effort to implement, yet are generally both less easy to remember and less useful than Case IDs. It may also be noted that email aliases could be created before "firstname.lastname" was "deployed", and anyone requiring a more friendly email address could create an alias.

A Case ID can be validated using the following Perl Compatible Regular Expression

/^[a-z]{3}[0-9]{0,4}$/

Note that this regular expression only tests for lower case letters. When storing Case ID's, you should always convert the letters to lower case.