How can I use Custom Validation for the Input Email upon SignUp?

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Currently Auth0 allows emails like {{9*9}}@XYZ.com for email/password authentication, I do not want to allow some characters like {, } or * because of the further flow of my application.

Is there a way I can achieve this providing my custom regex?
OR
Can I achieve this using PreUserRegistration Flow?
Ref: Pre User Registration Flow

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Update on this

I am able to use my custom validation using PreUserRegistration Flow but the error highlights the Password Field instead of Email

image
image357×602 28 KB

Is there are way I can fix this?

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