UserValidationRules.php

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<?php
namespace Magento\User\Model;

use Magento\Framework\Validator\EmailAddress;
use Magento\Framework\Validator\NotEmpty;
use Magento\Framework\Validator\Regex;
use Magento\Framework\Validator\StringLength;

class UserValidationRules
{
    const MIN_PASSWORD_LENGTH = 7;

    public function addUserInfoRules(\Magento\Framework\Validator\DataObject $validator)
    {
        $userNameNotEmpty = new NotEmpty();
        $userNameNotEmpty->setMessage(
            __('"User Name" is required. Enter and try again.'),
            \Zend_Validate_NotEmpty::IS_EMPTY
        );
        $firstNameNotEmpty = new NotEmpty();
        $firstNameNotEmpty->setMessage(
            __('"First Name" is required. Enter and try again.'),
            \Zend_Validate_NotEmpty::IS_EMPTY
        );
        $lastNameNotEmpty = new NotEmpty();
        $lastNameNotEmpty->setMessage(
            __('"Last Name" is required. Enter and try again.'),
            \Zend_Validate_NotEmpty::IS_EMPTY
        );
        $emailValidity = new EmailAddress();
        $emailValidity->setMessage(
            __('Please enter a valid email.'),
            \Zend_Validate_EmailAddress::INVALID
        );

        $validator->addRule(
            $userNameNotEmpty,
            'username'
        )->addRule(
            $firstNameNotEmpty,
            'firstname'
        )->addRule(
            $lastNameNotEmpty,
            'lastname'
        )->addRule(
            $emailValidity,
            'email'
        );

        return $validator;
    }

    public function addPasswordRules(\Magento\Framework\Validator\DataObject $validator)
    {
        $passwordNotEmpty = new NotEmpty();
        $passwordNotEmpty->setMessage(__('Password is required field.'), NotEmpty::IS_EMPTY);
        $minPassLength = self::MIN_PASSWORD_LENGTH;
        $passwordLength = new StringLength(['min' => $minPassLength, 'encoding' => 'UTF-8']);
        $passwordLength->setMessage(
            __('Your password must be at least %1 characters.', $minPassLength),
            \Zend_Validate_StringLength::TOO_SHORT
        );
        $passwordChars = new Regex('/[a-z].*\d|\d.*[a-z]/iu');
        $passwordChars->setMessage(
            __('Your password must include both numeric and alphabetic characters.'),
            \Zend_Validate_Regex::NOT_MATCH
        );
        $validator->addRule(
            $passwordNotEmpty,
            'password'
        )->addRule(
            $passwordLength,
            'password'
        )->addRule(
            $passwordChars,
            'password'
        );

        return $validator;
    }

    public function addPasswordConfirmationRule(
        \Magento\Framework\Validator\DataObject $validator,
        $passwordConfirmation
    ) {
        $passwordConfirmation = new \Zend_Validate_Identical($passwordConfirmation);
        $passwordConfirmation->setMessage(
            __('Your password confirmation must match your password.'),
            \Zend_Validate_Identical::NOT_SAME
        );
        $validator->addRule($passwordConfirmation, 'password');
        return $validator;
    }
}