diff --git a/roles/matrix-bridge-mautrix-facebook/defaults/main.yml b/roles/matrix-bridge-mautrix-facebook/defaults/main.yml
index fc888675..9a1214f3 100644
--- a/roles/matrix-bridge-mautrix-facebook/defaults/main.yml
+++ b/roles/matrix-bridge-mautrix-facebook/defaults/main.yml
@@ -171,7 +171,7 @@ matrix_mautrix_facebook_registration_yaml: |
   namespaces:
     users:
     - exclusive: true
-      regex: '@facebook_.+:{{ matrix_mautrix_facebook_homeserver_domain|regex_escape }}'
+      regex: '^@facebook_.+:{{ matrix_mautrix_facebook_homeserver_domain|regex_escape }}$'
   url: {{ matrix_mautrix_facebook_appservice_address }}
   sender_localpart: facebookbot
   rate_limited: false
diff --git a/roles/matrix-bridge-mautrix-telegram/defaults/main.yml b/roles/matrix-bridge-mautrix-telegram/defaults/main.yml
index af80ff31..df87de26 100644
--- a/roles/matrix-bridge-mautrix-telegram/defaults/main.yml
+++ b/roles/matrix-bridge-mautrix-telegram/defaults/main.yml
@@ -367,10 +367,10 @@ matrix_mautrix_telegram_registration_yaml: |
   namespaces:
       users:
       - exclusive: true
-        regex: '@telegram_.+:{{ matrix_mautrix_telegram_homeserver_domain|regex_escape }}'
+        regex: '^@telegram_.+:{{ matrix_mautrix_telegram_homeserver_domain|regex_escape }}$'
       aliases:
       - exclusive: true
-        regex: '#telegram_.+:{{ matrix_mautrix_telegram_homeserver_domain|regex_escape }}'
+        regex: '^#telegram_.+:{{ matrix_mautrix_telegram_homeserver_domain|regex_escape }}$'
   url: {{ matrix_mautrix_telegram_appservice_address }}
   sender_localpart: telegrambot
   rate_limited: false