Validate count max value with text include break line (new line)

Line Break, Space, Tabs all are counted in validation as a character. Database will also count that as a character.

And, so does JavaScript. What, validation are you using in JavaScript? Make sure that front-end validator is counting these as a character instead.

When you want to use just max 10 chars, then instead of <textarea> just use <input type="text">

That, Or create a custom rule - https://laravel.com/docs/7.x/validation#custom-validation-rules Before executing the max logic just sanitise your input with removing the new lines and empty spaces, but handling that on the front end seems to be more accurate solution.

@niush I mean I use JS ember in view by JsValidator . The first time, I input 10 character as above example, click over textarea, validator checked and pass. After that, I click submit , send request to server, can not pass and reload page.

@michaloravec Just an example that I use max 10 character, but I used max 255 and more.So I need to use <text area>

@m7vm7v Let me try to custom. This is param send to Validator:

"text" => "'"abcd\r\n
	efghi
"'"

I tried to count by strlen

return strlen("abcd\r\nefghi"); // result is 11 character

@trungtranqn91 Use custom validation rules

<?php

namespace App\Rules;

use Illuminate\Contracts\Validation\Rule;

class MaxCharacters implements Rule
{
    protected $max;

    /**
     * Create a new rule instance.
     *
     * @return void
     */
    public function __construct($max = 255)
    {
        $this->max = $max;
    }

    /**
     * Determine if the validation rule passes.
     *
     * @param  string  $attribute
     * @param  mixed  $value
     * @return bool
     */
    public function passes($attribute, $value)
    {
        return strlen(preg_replace('/\s+/', ' ', $value)) <= $this->max;
    }

    /**
     * Get the validation error message.
     *
     * @return string
     */
    public function message()
    {
        return "The :attribute may not be greater than {$this->max}.";
    }
}

use App\Rules\MaxCharacters;

$rules = [
    'text' => [new MaxCharacters(10)],
];

@michaloravec

Thank for your solution . My custom validation is this way:

class AppServiceProvider extends ServiceProvider
{
    /**
     * Bootstrap any application services.
     *
     * @return void
     */
    public function boot()
       Validator::extend('max_custom', function ($attribute, $value, $parameters) {
            return strlen(str_replace(["\r\n", "\n", "\r"], ' ', $value)) <= $parameters[0];
        });
}

$rules = [
    'text' => 'max_custom:10',
];

It's work and shorter. Do you think should I do this way ?

@trungtranqn91 It's up to you, I prefer to use Rule Objects

And for all whitespace using regex is better, because you have there tabs \t and so on.

preg_replace('/\s+/', ' ', $value)

@michaloravec I tested this but don't work,

$value = "abcd\r\nefghi";
return preg_replace('/\s+/', ' ', $value); // result: "abcd\r\nefghi" nothing happend , why?

@trungtranqn91 Check http://codepad.org/phYzggIa

So result is abcd efghi