\d needs to be escaped

nuke.yml

@@ -17,7 +17,7 @@
       shell: "rm /var/run/netns/*"
       ignore_errors: true
     - name: Remove stale vxlan interfaces
-      shell: "for interface in $(ip link | grep DOWN | grep -Po 'vxlan-\d{1,2}'); do ip link del $interface ; done"
+      shell: "for interface in $(ip link | grep DOWN | grep -Po 'vxlan-\\d{1,2}'); do ip link del $interface ; done"
       ignore_errors: true