How to constrain a route parameter with a given regular expression globally in Laravel?

How would you make sure a route parameter id is always a numeric value. Most of the time an id parameter will be an integer value. So today’s tutorial we will show how to globally constrain a parameter to a regular expression.

You should define these patterns in the boot method of your App\Providers\RouteServiceProvider class.

In the boot method you will write like this

/**
 * Define your route model bindings, pattern filters, etc.
 *
 * @return void
 */
public function boot()
{
    Route::pattern('id', '[0-9]+');
}

So we are ready with the pattern in the boot method, now declare the route in web.php or api.php or whatever route file is used by your application.

Route::get('/user/{id}', function ($id) {
    // Only works if the id is numeric value
});

That’s it! For testing, you can try to input some non-numeric values and you will see how it’s working. Basically, this avoids the hassle of writing a validation for each and every id parameter individually.

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