UiPath Apps

The UiPath Apps Guide

About Expressions




To better understand how Expressions work, check out the Use Expressions page in the How To section.

Expressions are comprised of several operations allowing you to transform, modify, and compute the data within an app in order to return an output result. Expressions can be used in several scenarios, such as:

  • Bind to variables, process output, and other control values from the resources panel.
  • Concatenate strings using the & symbol.
  • Perform comparative operations.
  • Create logical operators within comparative operations.
  • Set control values through the If function added to comparative operations.
  • Perform arithmetic operations with the help of expressions.
  • Declare static data such as "String", true/false, 123, etc or static lists of primitives such as a list of strings.
  • Control hidden, disabled, font/background color properties.
  • Reference a selected record or field on a record from another control.

Configuring expressions

The following operations can be used when configuring expressions:

  • Functions
  • Named Operators


The following functions are made available for Apps:

And, Or, NotThe And function returns true if all arguments are true.
The Or function returns true if any of the arguments are true.
The Not function returns true if its arguments is false, and returns false if its argument is true.
ConcatCombines multiple strings into a single string
ContainsReturns true if a string contains a text fragment.
EndsWithReturns true if a string ends with a text fragment.
IfReturns one value if a condition is true and another value if not.
IsBlankChecks for a blank value.
LengthReturns the length of a text string.
ListCreate a static list of values from one or more pieces of text in order to further use it in other lists or dropdowns
StartsWithReturns true if a string starts with a text fragment.
SumSum a specific column in a table or custom list control.
SortSort the information from a source based on its fields.
NowReturn the current date and time in your time zone.
TodayReturn the current date in your time zone.
TimeReturn the current time in your time zone.
YearReturn the year component of a Date/Time value.
MonthReturn the month component of a Date/Time value.
DayReturn the day component of a Date/Time value.
HourReturn the hour component of a Date/Time value.
MinuteReturn the minute component of a Date/Time value.
NewCreate a new in-memory entity.
LookupFind and return the first record in a table that satisfies a formula or condition.
FilterFilter a table based on its fields.


In addition to functions, Apps expressions also supports mathematical and conditional operators. For supported operators, see the table below.

Additive expression+, -
Atomic expression(), Literal, Variable, Functions
Comparison expression<, <=, >, >=, in
Concatenation expression&
Equality expression==, !=
Exponentiation expression^
Logical expression&&, and, AND, | |, or, OR
Multiplicative expression*, /, %
Unary expression!, not, NOT, unary +, unary -

Where can expressions be used

Expressions can be used for the following:

  • Controls
  • Rules


Expressions are enabled for hidden and disabled properties for the following controls and their display values:

  • Button - Text (icon not supported)
  • Checkbox - Label, Checked
  • DatePicker - Hint Text
  • Dropdown - Hint Text, Default Selected
  • Switch - Label, On
  • Text Area - Default Text, Hint Text
  • Textbox - Default Text, Hint Text
  • Label - Text
  • Header - Text
  • Image - URL



When used on control properties, expressions are re-evaluated at runtime if any of their dependent values changes.


Rules are used to enable conditional logic. You can use expressions on the following rules:

  • If - Compare, Group
  • Open URL - URL
  • Show Message - Title, Message
  • Show/hide spinner - Message
  • Start process - Input override
  • Set Value - Value



Expressions are not reevaluated continuously when used in rules, only at the time that the rule is triggered.

Updated about 21 hours ago

About Expressions

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