Fixed email for key creation validating

source/ubl-settings-repomanager-key.c

@@ -16,7 +16,7 @@ void on_key_generate_accept(GtkWidget *self, key_creation_window* window){
         yon_ubl_status_highlight_incorrect(window->NameEntry);
         return;
     }
-    if (!yon_char_is_empty(email)&&!g_regex_match_simple("^(?!\\.)\\S+@\\S+.[^.]\\S+",email,0,0)){
+    if (!yon_char_is_empty(email)&&!g_regex_match_simple("^(?!.*[@.]{2})(?!^[@.])[^@.]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,}$",email,0,0)){
         yon_ubl_status_box_spawn(GTK_CONTAINER(window->StatusBox),EMAIL_INVALID_LABEL,5,BACKGROUND_IMAGE_FAIL_TYPE);
         yon_ubl_status_highlight_incorrect(window->EmailEntry);
         return;