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.

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