How to pass a value with a dot to routing in slimframework?

Question

Slim Framework

you need to pass the API version, but slim says 404 in response, apparently the problem is in the dots in the address

I have
slim 2.6*

/api/v1.0.2
I do an example query like this

$app->get('/api/:ver', function ($ver) use ($app,$DB) {
  echo $ver;
})->conditions(array('ver' => '^v[0-9].[0-9].[0-9]'));