Custom Error Message

I have a field that uses a regex code to check if a field is valid.
In error message I enter my custom error message…
But all I get is warning “Regular Expression is Not Matched” instead of my custom warning…
How do I fix this.
Thansk

What version are you using? Have you enabled Server-side or Client-side validation?

ASNM 24.11, yes server and client side validation is active

It should work for ASP.NET Maker 2025. For ASP.NET Maker 2024, try the Form_CustomValidate client script instead.