In the Management Portal at Entitlement Catalog, when you configure a workflow action for a service, you can optionally replace the values in various fields with functions. With the function @[REPLACE(<expression>,<find>,<replace>)], you can replace characters in an expression with other characters.
For example, if a person attribute has a value that specifies the phone number of this person, you can use the function in a service attribute to replace blanks in the phone number with another character. If the phone number of a person is 073 622 8800, use @[REPLACE(#Service[PhoneNumber], ,-)]. If you use this service attribute in a Set Person Attribute action, the phone number in the person attribute is changed to 073-622-8800.