Add regex example to advanced routing

Author: ciarams87

examples/advanced-routing/regex-route.yaml

@@ -0,0 +1,17 @@
+apiVersion: gateway.networking.k8s.io/v1
+kind: HTTPRoute
+metadata:
+  name: coffee-regex
+spec:
+  parentRefs:
+  - name: cafe
+  hostnames:
+  - cafe.example.com
+  rules:
+  - matches:
+    - path:
+        type: RegularExpression
+        value: /coffee/[a-z]+
+    backendRefs:
+    - name: coffee-v1-svc
+      port: 80