php - routes in codeigniter/pyrocms -


i saw route downloaded sample module @ pyrocms

$route['sample(/:num)?'] = 'sample/index$1';

i tried removed '$1' above , site runs smooth. wondering what's for, , can remove it.

$1 whatever matched (:num) group - is, really, valid numbers. whatever add passed parameter view method in pages controller. example

$route['sample(/:num)?'] = 'sample/index/$1';

now in sample controller 

function index($id){    // $id matched group (:num) }

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