diff --git a/inventory/groups.yaml b/inventory/groups.yaml
index 58c3be7fec..0edfba0b88 100644
--- a/inventory/groups.yaml
+++ b/inventory/groups.yaml
@@ -175,7 +175,7 @@ groups:
     - logstash-worker[0-9]*.open*.org
     - logstash[0-9]*.open*.org
     - mirror-update[0-9]*.open*.org
-    - mirror[0-9]*.*.*.open*.org
+    - ^mirror[0-9].*\..*\.(?!linaro|linaro-london|arm64ci).*\.open.*\.org
     - openstackid[0-9]*.openstack.org
     - openstackid-dev[0-9]*.openstack.org
     - paste[0-9]*.open*.org
diff --git a/playbooks/roles/install-ansible/files/inventory_plugins/test-fixtures/results.yaml b/playbooks/roles/install-ansible/files/inventory_plugins/test-fixtures/results.yaml
index 33add16ce5..23f8082c2c 100644
--- a/playbooks/roles/install-ansible/files/inventory_plugins/test-fixtures/results.yaml
+++ b/playbooks/roles/install-ansible/files/inventory_plugins/test-fixtures/results.yaml
@@ -39,6 +39,11 @@ results:
     - puppet
     - puppet4
 
+  mirror01.lon1.linaro-london.openstack.org:
+    - afs-client
+    - mirror
+    - puppet
+
   mirror-update01.openstack.org:
     - afsadmin
     - puppet
diff --git a/playbooks/roles/install-ansible/files/inventory_plugins/test_yamlgroup.py b/playbooks/roles/install-ansible/files/inventory_plugins/test_yamlgroup.py
index 7562ddb4fe..f6b18733fe 100644
--- a/playbooks/roles/install-ansible/files/inventory_plugins/test_yamlgroup.py
+++ b/playbooks/roles/install-ansible/files/inventory_plugins/test_yamlgroup.py
@@ -37,7 +37,7 @@ class TestInventory(testtools.TestCase):
 
         results_yaml = os.path.join(FIXTURE_DIR, 'results.yaml')
         with open(results_yaml) as f:
-            results = yaml.load(f)
+            results = yaml.load(f, Loader=yaml.FullLoader)
             results = results['results']
 
         # Build the inventory list.  This is a list of Host objects
@@ -65,7 +65,7 @@ class TestInventory(testtools.TestCase):
         # real-life, which gets the groups into the config object
         path = os.path.join(FIXTURE_DIR, 'groups.yaml')
         with open(path) as f:
-            config_groups = yaml.load(f)
+            config_groups = yaml.load(f, Loader=yaml.FullLoader)
             config_groups = config_groups['groups']
         im = InventoryModule()
         im._read_config_data = mock.MagicMock()
diff --git a/playbooks/roles/install-ansible/files/inventory_plugins/yamlgroup.py b/playbooks/roles/install-ansible/files/inventory_plugins/yamlgroup.py
index 4fb41cae83..1b47315232 100644
--- a/playbooks/roles/install-ansible/files/inventory_plugins/yamlgroup.py
+++ b/playbooks/roles/install-ansible/files/inventory_plugins/yamlgroup.py
@@ -3,6 +3,7 @@
 
 import fnmatch
 import os
+import re
 
 from ansible.parsing.yaml.objects import AnsibleMapping
 from ansible.plugins.inventory import BaseFileInventoryPlugin
@@ -28,7 +29,10 @@ DOCUMENTATION = '''
           - section: inventory_plugin_yaml
             key: yaml_valid_extensions
       groups:
-        description: dict with group name as key and list of fnmatch patterns
+        description: |
+          dict with group name as key. If the list item starts with a
+          ^ it will be considered a regex pattern (i.e. passed to
+          re.match), otherwise it is considered a fnmatch pattern.
         type: dict
         default: {}
 '''
@@ -38,6 +42,7 @@ groups:
   amazing:
     - fullhost.example.com
     - amazing*
+    - ^regex.*pattern
 '''
 
 
@@ -75,8 +80,16 @@ class InventoryModule(BaseFileInventoryPlugin):
                 # failing.
                 if isinstance(candidate, AnsibleMapping):
                     candidate = list(candidate.keys())[0]
+
+                # Starts with ^ means it is already a regex.
+                # Otherwise it's a fnmatch compatible string; use it's
+                # helper to turn that into a regex so we have a common
+                # match below.
+                if not candidate.startswith('^'):
+                    candidate = fnmatch.translate(candidate)
+
                 for existing in self.inventory.hosts.values():
-                    if fnmatch.fnmatch(existing.get_name(), candidate):
+                    if re.match(candidate, existing.get_name()):
                         found_groups.setdefault(group, [])
                         found_groups[group].append(existing)