where is email validation code in user registration?
i check RegisterApproval(),RegisterBasic(),RegisterCaptcha(),RegisterInvitation() method on class.entrycontroller.php file
here their common code
$this->UserModel->Validation->ApplyRule('Name', 'Username', $this->UsernameError);
$this->UserModel->Validation->ApplyRule('TermsOfService', 'Required', T('You must agree to the terms of service.'));
$this->UserModel->Validation->ApplyRule('Password', 'Required');
$this->UserModel->Validation->ApplyRule('Password', 'Match');
$this->UserModel->Validation->ApplyRule('DiscoveryText', 'Required', 'Tell us why you want to join!');
where is code for validate email filed?
is it validate automatically calling $this->AddRule('Email', 'function:ValidateEmail'); function 
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Comments
found it on class.usermodel.php
please close post