DashboardImport: Fix variable interpolation when property contains multiple variable expressions (#26574)

(cherry picked from commit 5e73a92327)

pkg/plugins/dashboard_importer.go

@@ -126,7 +126,7 @@ func (this *DashTemplateEvaluator) findInput(varName string, varType string) *Im
 func (this *DashTemplateEvaluator) Eval() (*simplejson.Json, error) {
 	this.result = simplejson.New()
 	this.variables = make(map[string]string)
-	this.varRegex, _ = regexp.Compile(`(\$\{.+\})`)
+	this.varRegex, _ = regexp.Compile(`(\$\{.+?\})`)
 
 	// check that we have all inputs we need
 	for _, inputDef := range this.template.Get("__inputs").MustArray() {

pkg/plugins/dashboard_importer_test.go

@@ -58,7 +58,7 @@ func TestDashboardImport(t *testing.T) {
 			}
 		],
 		"test": {
-			"prop": "${DS_NAME}"
+			"prop": "${DS_NAME}_${DS_NAME}"
 		}
 		}`))
 
@@ -73,7 +73,7 @@ func TestDashboardImport(t *testing.T) {
 		So(err, ShouldBeNil)
 
 		Convey("should render template", func() {
-			So(res.GetPath("test", "prop").MustString(), ShouldEqual, "my-server")
+			So(res.GetPath("test", "prop").MustString(), ShouldEqual, "my-server_my-server")
 		})
 
 		Convey("should not include inputs in output", func() {