Container name having space and special characters should be disallowed, current regular expression is wrong

stack@vagrant:~$ zun create --name "Pradeep Singh" --image busybox
+---------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Property | Value |
+---------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| status | Creating |
| workdir | None |
| name | Pradeep Singh |
| links | ["{u'href': u'http://10.0.2.15:9517/v1/containers/f3bfaf5a-a3e7-48c8-9aa1-d9aa35ca753e', u'rel': u'self'}", "{u'href': u'http://10.0.2.15:9517/containers/f3bfaf5a-a3e7-48c8-9aa1-d9aa35ca753e', u'rel': u'bookmark'}"] |
| image | busybox |
| labels | {} |
| cpu | None |
| environment | {} |
| command | None |
| hostname | None |
| memory | None |
| task_state | None |
| status_reason | None |
| ports | [] |
| uuid | f3bfaf5a-a3e7-48c8-9aa1-d9aa35ca753e |
+---------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
stack@vagrant:~$ docker run --name "Pradeep Singh" busybox
Unable to find image 'busybox:latest' locally
latest: Pulling from library/busybox
56bec22e3559: Pull complete
Digest: sha256:29f5d56d12684887bdfa50dcd29fc31eea4aaf4ad3bec43daf19026a7ce69912
Status: Downloaded newer image for busybox:latest
docker: Error response from daemon: Invalid container name (Pradeep Singh), only [a-zA-Z0-9][a-zA-Z0-9_.-] are allowed.
See 'docker run --help'.
stack@vagrant:~$ zun show "Pradeep Singh"
+---------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Property | Value |
+---------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| status | Error |
| workdir | None |
| name | Pradeep Singh |
| links | ["{u'href': u'http://10.0.2.15:9517/v1/containers/f3bfaf5a-a3e7-48c8-9aa1-d9aa35ca753e', u'rel': u'self'}", "{u'href': u'http://10.0.2.15:9517/containers/f3bfaf5a-a3e7-48c8-9aa1-d9aa35ca753e', u'rel': u'bookmark'}"] |
| image | busybox |
| labels | {} |
| cpu | None |
| environment | {} |
| command | None |
| hostname | None |
| memory | None |
| task_state | None |
| status_reason | Image busybox not found |
| ports | [] |
| uuid | f3bfaf5a-a3e7-48c8-9aa1-d9aa35ca753e |
+---------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
stack@vagrant:~$