Merge pull request #747 from sydnash/sydnash-patch-1

.只能匹配任意字符一次

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
 	}