Fix regex detection. Fixes micro#1663 (micro#1696)

api/router/registry/registry.go

@@ -188,7 +188,7 @@ func (r *registryRouter) store(services []*registry.Service) {
 		for _, p := range ep.Endpoint.Path {
 			var pcreok bool
 
-			if p[0] == '^' && p[len(p)-1] != '$' {
+			if p[0] == '^' && p[len(p)-1] == '$' {
 				pcrereg, err := regexp.CompilePOSIX(p)
 				if err == nil {
 					cep.pcreregs = append(cep.pcreregs, pcrereg)

api/router/registry/registry_test.go

@@ -0,0 +1,34 @@
+package registry
+
+import (
+	"testing"
+
+	"github.com/micro/go-micro/v2/registry"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestStoreRegex(t *testing.T) {
+	router := newRouter()
+	router.store([]*registry.Service{
+		{
+			Name:    "Foobar",
+			Version: "latest",
+			Endpoints: []*registry.Endpoint{
+				{
+					Name: "foo",
+					Metadata: map[string]string{
+						"endpoint":    "FooEndpoint",
+						"description": "Some description",
+						"method":      "POST",
+						"path":        "^/foo/$",
+						"handler":     "rpc",
+					},
+				},
+			},
+			Metadata: map[string]string{},
+		},
+	},
+	)
+
+	assert.Len(t, router.ceps["Foobar.foo"].pcreregs, 1)
+}