preg_match(): Compilation failed in Shield and Myth/Auth

Hello guys!
If anyone knows this please help.
I am using apache 2.4.51, PHP 8.0.12 on Microsoft Windows 11 64 bit operating system and using Codeigniter 4.3.1 to test Shield and Myth/Auth.

It worked fine until everything used locale(language).
However, after applying locale, there is no problem in get, but the following error occurs in post.

Of course, the data transmitted to the database is not entered.

browser error message
==============================
ErrorException
preg_match(): Compilation failed: unmatched closing parenthesis at offset 7
SYSTEMPATH\Router\Router.php at line 418

411
412            // Are we dealing with a locale?
413            if (strpos($routeKey, '{locale}') !== false) {
414                $routeKey = str_replace('{locale}', '[^/]+', $routeKey);
415            }
416
417            // Does the RegEx match?
418            if (preg_match('#^' . $routeKey . '$#u', $uri, $matches)) {
419                // Is this route supposed to redirect to another?
420                if ($this->collection->isRedirect($routeKey)) {
421                    // replacing matched route groups with references: post/([0-9]+) -> post/$1
422                    $redirectTo = preg_replace_callback('/(\([^\(]+\))/', static function () {
423                        static $i = 1;
424
425                        return '$' . $i++;

{PHP internal code}  —  CodeIgniter\Debug\Exceptions->errorHandler ( arguments )

SYSTEMPATH\Router\Router.php : 418  —  preg_match()

SYSTEMPATH\Router\Router.php : 181  —  CodeIgniter\Router\Router->checkRoutes ( arguments )

174        $uri = urldecode($uri);
175
176        // Restart filterInfo
177        $this->filterInfo  = null;
178        $this->filtersInfo = [];
179
180        // Checks defined routes
181        if ($this->checkRoutes($uri)) {
182            if ($this->collection->isFiltered($this->matchedRoute[0])) {
183                $multipleFiltersEnabled = config('Feature')->multipleFilters ?? false;
184                if ($multipleFiltersEnabled) {
185                    $this->filtersInfo = $this->collection->getFiltersForRoute($this->matchedRoute[0]);
186                } else {
187                    // for backward compatibility
188                    $this->filterInfo = $this->collection->getFilterForRoute($this->matchedRoute[0]);
SYSTEMPATH\CodeIgniter.php : 815  —  CodeIgniter\Router\Router->handle ( arguments )

808        $path = $this->determinePath();
809
810        $this->benchmark->stop('bootstrap');
811        $this->benchmark->start('routing');
812
813        ob_start();
814
815        $this->controller = $this->router->handle($path);
816        $this->method    = $this->router->methodName();
817
818        // If a {locale} segment was matched in the final route,
819        // then we need to set the correct locale on our Request.
820        if ($this->router->hasLocale()) {
821            $this->request->setLocale($this->router->getLocale());
822        }
SYSTEMPATH\CodeIgniter.php : 449  —  CodeIgniter\CodeIgniter->tryToRouteIt ( arguments )

442      *
443      * @deprecated $returnResponse is deprecated.
444      */
445    protected function handleRequest(?RouteCollectionInterface $routes, Cache $cacheConfig, bool $returnResponse = false)
446    {
447        $this->returnResponse = $returnResponse;
448
449        $routeFilter = $this->tryToRouteIt($routes);
450
451        $uri = $this->determinePath();
452
453        if ($this->enableFilters) {
454            // Start up the filters
455            $filters = Services::filters();
456
SYSTEMPATH\CodeIgniter.php : 368  —  CodeIgniter\CodeIgniter->handleRequest ( arguments )

361            $this->response->send();
362            $this->callExit(EXIT_SUCCESS);
363
364            return;
365        }
366
367        try {
368            return $this->handleRequest($routes, $cacheConfig, $returnResponse);
369        } catch (RedirectException $e) {
370            $logger = Services::logger();
371            $logger->info('REDIRECTED ROUTE at ' . $e->getMessage());
372
373            // If the route is a 'redirect' route, it throws
374            // the exception with the $to as the message
375            $this->response->redirect(base_url($e->getMessage()), 'auto', $e->getCode());
FCPATH\index.php : 67  —  CodeIgniter\CodeIgniter->run ()

60  *---------------------------------------------------------------
61  * LAUNCH THE APPLICATION
62  *---------------------------------------------------------------
63  * Now that everything is setup, it's time to actually fire
64  * up the engines and make this app do its thang.
65  */
66
67 $app->run();
==============================

Error message in log file
==============================
CRITICAL - (Time) --> preg_match(): Compilation failed: unmatched closing parenthesis at offset 7
in SYSTEMPATH\Router\Router.php on line 418.
1 [internal function]: CodeIgniter\Debug\Exceptions->errorHandler(2, 'preg_match(): Compilation failed: unmatched closing parenthesis at offset 7', 'SYSTEMPATH\\Router\\Router.php', 418)
2 SYSTEMPATH\Router\Router.php(418): preg_match('#^Search)$#u', 'en/auth/register', null)
3 SYSTEMPATH\Router\Router.php(181): CodeIgniter\Router\Router->checkRoutes('en/auth/register')
4 SYSTEMPATH\CodeIgniter.php(815): CodeIgniter\Router\Router->handle('en/auth/register')
5 SYSTEMPATH\CodeIgniter.php(449): CodeIgniter\CodeIgniter->tryToRouteIt(Object(CodeIgniter\Router\RouteCollection))
6 SYSTEMPATH\CodeIgniter.php(368): CodeIgniter\CodeIgniter->handleRequest(null, Object(Config\Cache), false)
7 FCPATH\index.php(67): CodeIgniter\CodeIgniter->run()
==============================

It seems your route is invalid.
Check your routes.

php spark routes

ci-phpunit-test | CodeIgniter Testing Guide | CodeIgniter 3 to 4 Upgrade Helper

@dolsorina Are you trying to access routes {locale}/login as below?

eg:

http://localhost:8080/index.php/fa/auth/a/show
http://localhost:8080/index.php/ja/auth/a/show

If yes, you should know that currently Shield does not support this method.

I want to know if you really need this possibility or not.

Because in order to support this method, we have to make changes in the file  Auth class LoginController and ... Shield.

shield-oauth | CodeIgniter SMS Rocket | CodeIgniter DEA Rule

It seems your route is invalid.
Check your routes.

php spark routes

Thank you very much.

I'm still learning about CodeIgniter.
>php spark routes

There was no problem before using Shield or Myth/Auth,
but the problem occurred when using the locale as follows.

App/Configuration/Routes.php
/*=================================*/
$routes->group('{locale}', static function ($routes) {
      service('auth')->routes($routes);
});
/*=================================*/

Of course there is no problem with the routing above.
This problem was caused by my incorrect use of regular expressions in other route rules.

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@dolsorina Are you trying to access routes {locale}/login as below?

eg:

http://localhost:8080/index.php/fa/auth/a/show
http://localhost:8080/index.php/ja/auth/a/show

If yes, you should know that currently Shield does not support this method.

I want to know if you really need this possibility or not.

Because in order to support this method, we have to make changes in the file  Auth class LoginController and ... Shield.

Thank you very much for your interest and reply.

The problem was caused by using regular expressions that violate routing rules.

@datamweb could you please advise in which version of CodeIgniter 4 that this bug was fixed? 

I'm currently facing issue with a downgraded project to 4.4.7 from 4.5.5 due to hosting constraints max PHP version to be PHP 7.4.33

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