diff --git a/zh/09.2.md b/zh/09.2.md
index e3b1d55a..58f97fdb 100644
--- a/zh/09.2.md
+++ b/zh/09.2.md
@@ -59,7 +59,7 @@
 	r.ParseForm()
 	username := r.Form.Get("username")
 	CleanMap := make(map[string]interface{}, 0)
-	if ok, _ := regexp.MatchString("^[a-zA-Z0-9].$", username); ok {
+	if ok, _ := regexp.MatchString("^[a-zA-Z0-9]+$", username); ok {
 		CleanMap["username"] = username
 	}