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Customer experience | Sales, Customer Insights,...
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Custom validation rule for registration form - regex is not working

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Posted on by Microsoft Employee

I need a custom email verification rule for my event registration form in Microsoft Dynamics Customer Insights (former Marketing). So, allow registration only for emails with @kokoko.com or koko.com

But regex doesn't seem to work. ^[a-zA-Z0-9._%+-]+@(kokoko\.com|koko\.com)$

I can still register with a random email. 

Is it only me? If yes, could you please tell me why? I checked it in different services like https://regex101.com/and they don't show the issues.

Screenshot 2026-03-26 153928.png
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