diff --git a/src/common/Utils.ts b/src/common/Utils.ts
index 20aaa56..961313d 100644
--- a/src/common/Utils.ts
+++ b/src/common/Utils.ts
@@ -7,7 +7,7 @@ export const isObjectIdString = (str: string) => {
 // check if a string is a valid share code
 // alphabet:'3fBCM8j17XNA9xYun4wmLWep2oHFlhPcgyEJskqOz6GK0UtV5ZRaDSvrTbidQI'
 export const isValidShareCode = (str: string) => {
-  let reg = new RegExp(`^[${BASE52_ALPHABET}]{10, 11}$`)
+  let reg = new RegExp(`^[${BASE52_ALPHABET}]{10,11}$`)
   return reg.test(str)
 }