changed regex to match /s instead /b

the default  vhost is a "/" which isn't a word and there's no word boundary to match on.

providers/user.rb

@@ -54,7 +54,7 @@ def user_has_tag?(name, tag)
 # empty perm_list means we're checking for any permissions
 def user_has_permissions?(name, vhost, perm_list = nil) # rubocop:disable all
   vhost = '/' if vhost.nil? # rubocop:enable all
-  cmd = "rabbitmqctl -q list_user_permissions #{name} | grep \"^#{vhost}\\b\""
+  cmd = "rabbitmqctl -q list_user_permissions #{name} | grep \"^#{vhost}\\s\""
   cmd = Mixlib::ShellOut.new(cmd)
   cmd.environment['HOME'] = ENV.fetch('HOME', '/root')
   cmd.run_command