diff --git a/server/dbdata/userauth.go b/server/dbdata/userauth.go
index 44ac09b..190e863 100644
--- a/server/dbdata/userauth.go
+++ b/server/dbdata/userauth.go
@@ -1,6 +1,9 @@
 package dbdata
 
-import "reflect"
+import (
+	"reflect"
+	"regexp"
+)
 
 var authRegistry = make(map[string]reflect.Type)
 
@@ -13,3 +16,8 @@ func makeInstance(name string) interface{} {
 	v := reflect.New(authRegistry[name]).Elem()
 	return v.Interface()
 }
+
+func ValidateIpPort(addr string) bool {
+	RegExp := regexp.MustCompile(`^(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\:([0-9]|[1-9]\d{1,3}|[1-5]\d{4}|6[0-5]{2}[0-3][0-5])$$`)
+	return RegExp.MatchString(addr)
+}
diff --git a/server/dbdata/userauth_radius.go b/server/dbdata/userauth_radius.go
index 13b627d..ef6691e 100644
--- a/server/dbdata/userauth_radius.go
+++ b/server/dbdata/userauth_radius.go
@@ -6,7 +6,6 @@ import (
 	"errors"
 	"fmt"
 	"reflect"
-	"regexp"
 	"time"
 
 	"layeh.com/radius"
@@ -71,8 +70,3 @@ func (auth AuthRadius) checkUser(name string, pwd string, authData map[string]in
 	}
 	return nil
 }
-
-func ValidateIpPort(addr string) bool {
-	RegExp := regexp.MustCompile(`^(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\:([0-9]|[1-9]\d{1,3}|[1-5]\d{4}|6[0-5]{2}[0-3][0-5])$$`)
-	return RegExp.MatchString(addr)
-}