A custom expression is a logical element in a condition or an action. When you configure a custom expression, you enter or select the expression logic and you select the fields that the expression will apply to.
When you add a custom expression to a condition, the custom expression applies the expression logic that you specify to the input data that you select and returns the result to the condition. The condition uses the rule statement operator to determine the next step. When you add a custom expression to an action, the action applies the expression logic to the input data that you select and returns the result as the rule statement output.
To add a custom expression to a condition, use the Custom expression option in the
Define Condition
dialog box. To add a custom expression to an action, use the Custom expression options in the
Define Action
dialog box.
Before you add the custom expression to a condition or action, you can validate the expression.
The following image shows the options for a sample custom expression in the
Define Condition
dialog box:
The dialog box includes the following options:
Built-in functions option.
Displays a library of custom expressions that you can apply to the input data.
Expression field.
Displays the expression logic.
Fields option.
Displays the input fields that you can select.
Click
Add
next to the field that you want to use.
Properties field.
Displays the details of the input field or the built-in function that you select.
Validate option.
Validates the custom expression.
You select the Built-in functions option and the Fields option from the same menu.
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