Can someone give me some ideas on how to validate my custom field "Phone Number"? This is a text field, and it accepts integer values, but we are running into issues where some of our external help desk members are not capturing all 10 digits of the phone number. Previously I tried to make the field required but it ended up breaking the template of the issues we receive via email (only Description and Summary can be required). Any way I can validate the field upon issue create using regex? Any other suggestions?