You can easily edit an expression.

To edit an expression:

1. Right-click the parameter field that contains the expression you want to edit.
2. From the menu select Edit Expression.

   

   The Expresso Calculator appears with the expression highlighted in the text field.

   

3. Edit and reapply the expression.

To save time, you can cycle through the various expression tokens that make up the string by using Alt + slash (/) on the keyboard. This is particularly useful when you are not sure of the exact sequence or writing convention of the expression string.