src/Forms/EmailField.php
public function validate($validator)
    {
        $this->value = trim($this->value);

        $pattern = '^[a-z0-9!#$%&\'*+/=?^_`{|}~-]+(?:\\.[a-z0-9!#$%&\'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?$';

        // Escape delimiter characters.
        $safePattern = str_replace('/', '\\/', $pattern);

        if ($this->value && !preg_match('/' . $safePattern . '/i', $this->value)) {
            $validator->validationError(
                $this->name,
                _t('SilverStripe\\Forms\\EmailField.VALIDATION', 'Please enter an email address'),
                'validation'
            );

            return false;
        }

        return true;
    }
public function validate($validator)
    {
        $this->value = trim($this->value);

        $pattern = '^[a-z0-9!#$%&\'*+/=?^_`{|}~-]+(?:\\.[a-z0-9!#$%&\'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?$';

        // Escape delimiter characters.
        $safePattern = str_replace('/', '\\/', $pattern);

        if ($this->value && !preg_match('/' . $safePattern . '/i', $this->value)) {
            $validator->validationError(
                $this->name,
                _t('SilverStripe\\Forms\\EmailField.VALIDATION', 'Please enter an email address'),
                'validation'
            );

            return false;
        }

        return true;
    }
public function validate ( $ validator ) { $ this -> value = trim ( $ this -> value ) ; $ pattern = '^[a-z0-9!#$%&\'*+/=?^_`{|}~-]+(?:\\.[a-z0-9!#$%&\'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?$' ; // Escape delimiter characters. $ safePattern = str_replace ( '/' , '\\/' , $ pattern ) ; if ( $ this -> value && ! preg_match ( '/' . $ safePattern . '/i' , $ this -> value ) ) { $ validator -> validationError ( $ this -> name , _t ( 'SilverStripe\\Forms\\EmailField.VALIDATION' , 'Please enter an email address' ) , 'validation' ) ; return false ; } return true ; }
Validates for RFC 2822 compliant email addresses.

@see http://www.regular-expressions.info/email.html
@see http://www.ietf.org/rfc/rfc2822.txt

@param Validator $validator

@return string
Validates for RFC 2822 compliant email addresses .