Laravel 3 Route Contraint / Parameter Validation with Regular Expressions

routes.php

/**
*
* Below emulates Laravel 4 Regular Expression Route Constraints in Laravel 3.
*
**/

/**
 * Application Route Validation Patterns
 * Router::patterns['(:name)'] = '(regex pattern)';
 */
 \Laravel\Routing\Router::$patterns['(:yyyy)'] = '([0-9]{4})';
\Laravel\Routing\Router::$patterns['(:mm-dd)'] = '([0-9]{2}-[0-9]{2})';

/**
* Application Routes
**/
Route::get('/', 'app@index');
Route::get('/(:yyyy)', 'app@year');	// YYYY
Route::get('/(:yyyy)/(:mm-dd)', 'app@date'); // YYYY/MM-DD