diff --git a/ansible/roles/prometheus/templates/prometheus.yml.j2 b/ansible/roles/prometheus/templates/prometheus.yml.j2
index 99d1298a61..a8cf08f253 100644
--- a/ansible/roles/prometheus/templates/prometheus.yml.j2
+++ b/ansible/roles/prometheus/templates/prometheus.yml.j2
@@ -178,17 +178,17 @@ scrape_configs:
 {% endfor %}
     relabel_configs:
       - source_labels: [__address__]
-        regex: (\w+):(\w+):(.+)
+        regex: ([^:]+):([^:]+):(.+)
         target_label: service
         replacement: ${1}
       - source_labels: [__address__]
-        regex: (\w+):(\w+):(.+)
+        regex: ([^:]+):([^:]+):(.+)
         target_label: __param_module
         replacement: ${2}
       - source_labels: [__param_module]
         target_label: module
       - source_labels: [__address__]
-        regex: (\w+):(\w+):(.+)
+        regex: ([^:]+):([^:]+):(.+)
         target_label: __param_target
         replacement: ${3}
       - source_labels: [__param_target]
diff --git a/releasenotes/notes/fix-blackbox-regex-b16f3f86563de6db.yaml b/releasenotes/notes/fix-blackbox-regex-b16f3f86563de6db.yaml
new file mode 100644
index 0000000000..7488f7333c
--- /dev/null
+++ b/releasenotes/notes/fix-blackbox-regex-b16f3f86563de6db.yaml
@@ -0,0 +1,7 @@
+---
+fixes:
+  - |
+    Fixes the regex used to match blackbox exporter targets in the
+    ``prometheus.yml.j2`` template to be less strict. Previously we were using
+    ``\w`` which did not allow for names with periods or hyphens. The service
+    and module labels can now contain all characters except for a colon.