Question
Adqura
GB
Last activity: 24 Sep 2025 2:24 EDT
In Pega can we validate the text a user types in a text box is a valid expression (like a formula or logical expression)
Hello,
we need to capture some input information from the user in the UI, it will be combination of some text, and data fields combination, for Ex: .pyAvailability= 'always' OR 'within a defined time period'(Startdate<asoftoday && Enddate>asoftoday).
we need to validate either this is a valid expression or not. can we do it in pega?
Thanks,
Chandra Nelapati.
Cognizant Technology Solutions
SE
Yes, you can achieve this in Pega by configuring an Edit Validate rule for the property that holds the user input.
Edit Validate rule lets you write a custom Java function (inside a Rule-Utility-Function) to validate whether the string entered by the user is in the correct format (in your case, a valid formula/logical expression).
Once linked to the property, Pega will automatically invoke the validation whenever the user enters data in that text box.
If the input doesn’t match the expected expression syntax, Pega will display an error message on the UI.
But one thing is :
Pega doesn’t have an out-of-the-box expression parser for user-typed formulas. So the Edit Validate rule itself won’t magically understand logical expressions — you need to implement the parsing/validation logic (regex, token checks, or a custom parser) in the Java function you associate with the Edit Validate. Hope this link will help :) https://academy.pega.com/module/validating-data-against-pattern/v6