UK Postcode Validation Rule for Laravel

Postcode.php

<?php

namespace App\Rules;

use Closure;
use Illuminate\Contracts\Validation\ValidationRule;

/**
 * UK Postcode Validation Rule.
 *
 * The following is the UK Postcode Regular Expression and the corresponding
 * detail explaining the logic behind the UK Postcode Regular Expression.
 *
 * Logic:
 *     "GIR 0AA"
 * OR
 *     One letter followed by either one or two numbers
 * OR
 *     One letter followed by a second letter that must be one of ABCDEFGHJ
 *     KLMNOPQRSTUVWXY (i.e..not I) and then followed by either one or two
 *     numbers
 * OR
 *     One letter followed by one number and then another letter
 * OR
 *     A two part post code
 *         where the first part must be
 *         One letter followed by a second letter that must be one of ABCDEFGH
 *         JKLMNOPQRSTUVWXY (i.e..not I) and then followed by one number and
 *         optionally a further letter after that
 *     AND
 *         The second part (separated by a space from the first part) must be One
 *         number followed by two letters.
 *
 *     A combination of upper and lower case characters is allowed.
 *
 *     Note: the length is determined by the regular expression and is between 2 and 8
 *     characters.
 */
class Postcode implements ValidationRule
{
    /**
     * Run the validation rule.
     *
     * @param  \Closure(string): \Illuminate\Translation\PotentiallyTranslatedString  $fail
     */
    public function validate(string $attribute, mixed $value, Closure $fail): void
    {
        if (! preg_match('/^([Gg][Ii][Rr] 0[Aa]{2})|((([A-Za-z][0-9]{1,2})|(([A-Za-z][A-Ha-hJ-Yj-y][0-9]{1,2})|(([A-Za-z][0-9][A-Za-z])|([A-Za-z][A-Ha-hJ-Yj-y][0-9]?[A-Za-z])))) [0-9][A-Za-z]{2})$/', $value)) {
            $fail('The :attribute must be a valid UK postcode.');
        }
    }
}