isusernametaken( username )
Verifies whether a user account with the specified username is already present.
The username to check against the current list of active and deactivated users.
Returns a value of type Boolean.
false result indicates that the username is available to use when creating a new user, unless the username contains special characters that are not permitted.
Both active and deactivated user accounts are referenced.
The username parameter is case-sensitive, however you will not be able to create a username if case-insensitive matches exist.
isusernametaken() cannot be used to define a column of process report data or in a process event.
You can copy and paste these examples into the Expression Rule Designer to see how this works.
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