Rewrite url, I can't get id by segment on this url ???

[eluser]memVN[/eluser]
Hello, I have a problem.
my url is http://localhost/ci/category/45
Now I use routes to order rewrite this url follow: http://localhost/ci/category-45
With new url http://localhost/ci/category-45 . I can't get id of category . Who can help me???

[eluser]memVN[/eluser]
Who can help me? , I needing it's to use, thanks for

[eluser]Php Coder[/eluser]
use function explode

Code:

$explode=explode('-',category-45);

$id=$explode[1];

========
category-45
=======
mean your $this->uri->segment(1);

[eluser]memVN[/eluser]
Ok, thanks for Php coder