Regex for route work incorrect and return error 404 - regex

Question

I have custom regex for match correct username:
^(?=.{5,20}$)[a-zA-Z](?:[a-zA-Z0-9_]*[a-zA-Z0-9])?$
See demo
Here you can see my routes list:
Route::middleware(['userActivity'])->group(function () {
Route::group(['prefix' => '{nickname}','where' => ['nickname' => '^(?=.{5,20}$)[a-zA-Z](?:[a-zA-Z0-9_]*[a-zA-Z0-9])?$']], function ($nickname) {
Route::name('user.')->namespace('User')->group(function () {
Route::middleware(['auth', 'company'])->group(function () {
Route::namespace('Vacancy')->group( function () {
Route::prefix('vacancy')->name('vacancy.')->group( function () {
Route::get('/manage', "VacancyController#manage")->name('manage');
Route::post('/save', "VacancyController#save")->name('save');
});
});
});
});
});
});
In this case when I go to route user.vacancy.manage:
http://website.com/user_1544080981/vacancy/manage
Return error:
404 Page Not Found
When I change my regex to:
^(?=.{5,30}$)[a-zA-Z](?:[a-zA-Z0-9_]*[a-zA-Z0-9])?$
Note: Changed in regex only min and max length from {5,20} to {5,30}
Generaly when I see to part of url after domain name url length == 30
user_1544081143/vacancy/manage
But regex must work only for user nickname instead of to part url without domain name. Where I have any errors in my routes?

Answer 1

Regular expression, this is a better way then above in my opinion.
Route::any('{all}', function(){
return 'It Works';
})->where('all', '.*');
Using the Route::fallback method, you may define a route that will be executed when no other route matches the incoming request. Typically, unhandled requests will automatically render a "404" page via your application's exception handler. However, since you may define the fallback route within your routes/web.php file, all middleware in the web middleware group will apply to the route. Of course, you are free to add additional middleware to this route as needed:
Route::fallback(function () {
//
});