can't create channels with dots in name using slash command

[d-ushakov]

Rocket.Chat Version: 0.57.0-rc.1 (reproduced for 0.56.0 too)
Running Instances: 4
DB Replicaset OpLog: Enabled
Node Version: v4.8.2

Can't create channels with dots in name using slash command. Same channel can be created via UI.

Scenario:

1. /create "#test.test.test"
2. repeat step 1 again

Expected:
Channel "test.test.test" created.

Actual:
Channel "test" created. On second attempt it fails with "The channel #test already exists."

Workaround:
change packages/rocketchat-slashcommands-create/server.js line 15 to add dot into regexp:
from
const regexp = /#?([\d-\w]+)/g;
to
const regexp = /#?([\d-.\w]+)/g;

Proper fix should re-use RocketChat.settings.get('UTF8_Names_Validation').

[Broutard]

Same issue with /invite-all-from /invite-all-to