osb/app/Rules/IPv4_CIDR.php

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<?php
namespace App\Rules;
use Illuminate\Contracts\Validation\Rule;
class IPv4_CIDR implements Rule
{
private const MAX=32;
/**
* Determine if the validation rule passes.
*
* @param string $attribute
* @param mixed $value
* @return bool
*/
public function passes($attribute, $value)
{
if (str_contains($value,'/')) {
list($value,$mask) = explode('/',$value);
$m = filter_var($mask,\FILTER_VALIDATE_INT,[
'options' => [
'min_range' => 0,
"max_range" => self::MAX,
]]
);
return $m && filter_var($value,\FILTER_VALIDATE_IP,\FILTER_FLAG_IPV4);
}
}
/**
* Get the validation error message.
*
* @return string
*/
public function message()
{
return 'The :attribute must be a valid IPv4 CIDR range.';
}
}