diff --git a/tns-core-modules/utils/types.ts b/tns-core-modules/utils/types.ts
index 84e0bacde..53ccc87d8 100644
--- a/tns-core-modules/utils/types.ts
+++ b/tns-core-modules/utils/types.ts
@@ -43,7 +43,7 @@ export function verifyCallback(value: any) {
 }
 
 var classInfosMap = new Map<Function, ClassInfo>();
-var funcNameRegex = /function (.{1,})\(/;
+var funcNameRegex = /function ([_a-zA-Z0-9]{1,})\(/;
 export function getClass(object: Object): string {
     return getClassInfo(object).name;
 }
@@ -113,4 +113,4 @@ export class ClassInfo {
 
 export function toUIString(obj): string {
     return isNullOrUndefined(obj) ? "" : obj + "";
-}
\ No newline at end of file
+}