Expression editor

Expression Help

The Expression help offers a description and examples of all the functions available in the UiPath Process Mining expression language. The help contains a search field to find the functions that meet the search string you enter; both names of functions and help content are searched. See the illustration below for an example.

Note: Click on OK or double click on the name of the function in the Expression Help dialog to use the function in the Edit Expression Attribute dialog.

UiPath Process Mining Expression Language

In the Expression Language expressions can be the following types.

• Boolean
• Currency
• Date
• Duration
• Integer
• Percentage
• Time
• Double
• Text
• DateTime

Each expression evaluates to one of these types. The result of the expression must be of the same type for each record.

Autocomplete

You can autocomplete your expressions by pressing Ctrl + space when you are typing.

Converting expression ytpes

Some functions and operators in the expression language automatically convert their arguments to the same type. For example, the plus operator (‘+’) between a text value and an integer value will result in the integer being converted to a text value prior to the concatenation of the two.

Explicitly converting a value to another type can be done using the type’s corresponding cast function (boolean(), integer(), double(), currency(), percentage(), text(), date(), time(), datetime(), duration()).

Note: An Integer can be converted to a Double but converting a Text value to DateTime requires the input value to be in a specific format; it must match with the DateTime format settings for the application.

Syntax highlighting

In the expression editor the elements of an expression are highlighted according to the following syntax.

Comments

Also, comments can be added in the Edit Expression Attribute dialog.

Error feedback

When writing an expression in the Edit Expression Attribute dialog, feedback is displayed when an expression is not correct. For example, when functions are not used properly or when different types are mixed when not allowed. See the illustration below.

A square red icon indicates that the line contains an error. In the result panel a comment suggests that a closing parenthesis is expected after an opening parenthesis is displayed.

Error values

When an expression cannot be evaluated, an ERROR value is returned. For example, when you use a function which is only defined within a certain range, and the given parameter is outside of that range.