Regular Expression in api.php in Laravel

I am beginner in Laravel.
I need validation params in my url. I need form: dd.mm.YY (01.12.1984)

Route::get('age/{ageValue}', [HomeController::class, 'age'])->name('showByDate')->where('ageValue', '[d{1,2}.d{1,2}.d{4}/]+');

but it’s not working.

How can I repair it?