[php] Laravel password validation rule

How to added password validation rule in the validator?

Validation rule:

The password contains characters from at least three of the following five categories:

• English uppercase characters (A – Z)
• English lowercase characters (a – z)
• Base 10 digits (0 – 9)
• Non-alphanumeric (For example: !, $, #, or %)
• Unicode characters

How to add above rule in the validator rule?

My Code Here

// create the validation rules ------------------------
    $rules = array(
        'name'             => 'required',                        // just a normal required validation
        'email'            => 'required|email|unique:ducks',     // required and must be unique in the ducks table
        'password'         => 'required',
        'password_confirm' => 'required|same:password'           // required and has to match the password field
    );

    // do the validation ----------------------------------
    // validate against the inputs from our form
    $validator = Validator::make(Input::all(), $rules);

    // check if the validator failed -----------------------
    if ($validator->fails()) {

        // get the error messages from the validator
        $messages = $validator->messages();

        // redirect our user back to the form with the errors from the validator
        return Redirect::to('home')
            ->withErrors($validator);

    }

This doesn't quite match the OP requirements, though hopefully it helps. With Laravel you can define your rules in an easy-to-maintain format like so:

    $inputs = [
        'email'    => 'foo',
        'password' => 'bar',
    ];

    $rules = [
        'email'    => 'required|email',
        'password' => [
            'required',
            'string',
            'min:10',             // must be at least 10 characters in length
            'regex:/[a-z]/',      // must contain at least one lowercase letter
            'regex:/[A-Z]/',      // must contain at least one uppercase letter
            'regex:/[0-9]/',      // must contain at least one digit
            'regex:/[@$!%*#?&]/', // must contain a special character
        ],
    ];

    $validation = \Validator::make( $inputs, $rules );

    if ( $validation->fails() ) {
        print_r( $validation->errors()->all() );
    }

Would output:

    [
        'The email must be a valid email address.',
        'The password must be at least 10 characters.',
        'The password format is invalid.',
    ]

(The regex rules share an error message by default—i.e. four failing regex rules result in one error message)

A Custom Laravel Validation Rule will allow developers to provide a custom message with each use case for a better UX experience.

php artisan make:rule IsValidPassword

namespace App\Rules;

use Illuminate\Support\Str;
use Illuminate\Contracts\Validation\Rule;

class isValidPassword implements Rule
{
    /**
     * Determine if the Length Validation Rule passes.
     *
     * @var boolean
     */
    public $lengthPasses = true;

    /**
     * Determine if the Uppercase Validation Rule passes.
     *
     * @var boolean
     */
    public $uppercasePasses = true;

    /**
     * Determine if the Numeric Validation Rule passes.
     *
     * @var boolean
     */
    public $numericPasses = true;

    /**
     * Determine if the Special Character Validation Rule passes.
     *
     * @var boolean
     */
    public $specialCharacterPasses = true;

    /**
     * Determine if the validation rule passes.
     *
     * @param  string  $attribute
     * @param  mixed  $value
     * @return bool
     */
    public function passes($attribute, $value)
    {
        $this->lengthPasses = (Str::length($value) >= 10);
        $this->uppercasePasses = (Str::lower($value) !== $value);
        $this->numericPasses = ((bool) preg_match('/[0-9]/', $value));
        $this->specialCharacterPasses = ((bool) preg_match('/[^A-Za-z0-9]/', $value));

        return ($this->lengthPasses && $this->uppercasePasses && $this->numericPasses && $this->specialCharacterPasses);
    }

    /**
     * Get the validation error message.
     *
     * @return string
     */
    public function message()
    {
        switch (true) {
            case ! $this->uppercasePasses
                && $this->numericPasses
                && $this->specialCharacterPasses:
                return 'The :attribute must be at least 10 characters and contain at least one uppercase character.';

            case ! $this->numericPasses
                && $this->uppercasePasses
                && $this->specialCharacterPasses:
                return 'The :attribute must be at least 10 characters and contain at least one number.';

            case ! $this->specialCharacterPasses
                && $this->uppercasePasses
                && $this->numericPasses:
                return 'The :attribute must be at least 10 characters and contain at least one special character.';

            case ! $this->uppercasePasses
                && ! $this->numericPasses
                && $this->specialCharacterPasses:
                return 'The :attribute must be at least 10 characters and contain at least one uppercase character and one number.';

            case ! $this->uppercasePasses
                && ! $this->specialCharacterPasses
                && $this->numericPasses:
                return 'The :attribute must be at least 10 characters and contain at least one uppercase character and one special character.';

            case ! $this->uppercasePasses
                && ! $this->numericPasses
                && ! $this->specialCharacterPasses:
                return 'The :attribute must be at least 10 characters and contain at least one uppercase character, one number, and one special character.';

            default:
                return 'The :attribute must be at least 10 characters.';
        }
    }
}

Then on your request validation:

$request->validate([
    'email'    => 'required|string|email:filter',
    'password' => [
        'required',
        'confirmed',
        'string',
        new isValidPassword(),
    ],
]);

Sounds like a good job for regular expressions.

Laravel validation rules support regular expressions. Both 4.X and 5.X versions are supporting it :

• 4.2 : http://laravel.com/docs/4.2/validation#rule-regex
• 5.1 : http://laravel.com/docs/5.1/validation#rule-regex

This might help too:

http://www.regular-expressions.info/unicode.html