gistfile1.php

// 1
Route::get('bb/(:any?)/(:num?)', function($p1 = 'zzzz', $p2 = 9999)
{
  return "$p1 $p2";
});

// 2
Route::get('(:any?)/(:num?)', function($p1 = 'zzzz', $p2 = 9999)
{
  return "$p1 $p2";
});