fix #244

@@ -26,9 +26,11 @@ func (mr *FilterRouter) ValidRouter(router string) bool {
 			return true
 			return true
 		}
 		}
 		matches := mr.regex.FindStringSubmatch(router)
 		matches := mr.regex.FindStringSubmatch(router)
+		if len(matches) > 0 {
 			if len(matches[0]) == len(router) {
 			if len(matches[0]) == len(router) {
 				return true
 				return true
 			}
 			}
 		}
 		}
+	}
 	return false
 	return false
 }
 }