Help with pulling a new image with character '/'


I’m trying to pull a new image but I have a problem. It doesn’t works when the name contains character ‘/’.

For example, when I launch :

$ docker pull ibmcom/secure-gateway-client
repository name component must match "[a-z0-9]+(?:[._-][a-z0-9]+)*"

It works fine for names without character ‘/’

I read in some topics that is seems to be a restriction in docker engine’s regex.
Where can we change the expression ?

Thank you for your help.