If you are using ticketing system integration, than a ticket pattern can be set on the Ticket System Integration tab of the configuration page. If you don't want to restrict what ticket numbers a user can enter, you can live the Ticket Number Validation Pattern (Regex) check box blank. If you do want to restrict it, than you can enter a regular expression in the text box. The ticket number entered must match the regular expression.
For more information on regular expressions, please refer to this link:
http://www.grymoire.com/Unix/Regular.html
If you are supported and need assistance setting up a validation pattern, feel free to email support@thycotic.com.
Here is an example for a ticket pattern that must be a valid number:
^[0-9]+$Article ID: 242, Created On: 2/2/2012, Modified: 3/30/2012