diff --git a/source/libublsettings-config.c b/source/libublsettings-config.c
index 964fbba..f22c612 100644
--- a/source/libublsettings-config.c
+++ b/source/libublsettings-config.c
@@ -14,22 +14,17 @@ typedef struct yon_config_parameter
     char *save_command;
     char *load_command;
     int compare_ignore;
+    char *regex_mask_pattern;
 } yon_config_parameter;
 
 yon_config_parameter *yon_config_parameter_new_with_data(char *key, void *data){
     yon_config_parameter *param = yon_remalloc(NULL,sizeof(yon_config_parameter));
+    memset(param,0,sizeof(yon_config_parameter));
     param->data=yon_char_new(data);
     param->data_type=DICTIONARY_CHAR_TYPE;
     param->first=param;
     param->flag1=1;
     param->key=yon_char_new(key);
-    param->next=NULL;
-    param->prev=NULL;
-    param->section=NULL;
-    param->ignore=0;
-    param->save_command=NULL;
-    param->load_command=NULL;
-    param->compare_ignore=0;
     return param;
 }
 
@@ -128,6 +123,30 @@ int yon_config_set_ignore(char *key){
     }
 }
 
+int yon_config_set_mask_pattern(const char *key, const char *mask_pattern){
+    if (yon_char_is_empty(key)) return 0;
+    yon_config_parameter *parameter = (yon_config_parameter*)yon_dictionary_get((dictionary**)&__yon__config__strings,(char*)key);
+    if (!parameter) return 0;
+
+    if (!yon_char_is_empty(parameter->regex_mask_pattern))
+        free(parameter->regex_mask_pattern);
+
+    if (yon_char_is_empty(mask_pattern)){
+        parameter->regex_mask_pattern = NULL;
+    } else {
+        parameter->regex_mask_pattern = yon_char_new(mask_pattern);
+    }
+    return 1;
+}
+
+char *yon_config_get_mask_pattern(const char *key){
+    if (yon_char_is_empty(key)) return NULL;
+    yon_config_parameter *parameter = (yon_config_parameter*)yon_dictionary_get((dictionary**)&__yon__config__strings,(char*)key);
+    if (!parameter) return NULL;
+
+    return yon_char_new(parameter->regex_mask_pattern);
+}
+
 int yon_config_remove_ignore(char *key){
     dictionary *dict = yon_dictionary_get(&__yon_config_ignored,key);
     if (dict) {
@@ -897,11 +916,6 @@ enum YON_CONFIG_SAVED_TYPE yon_config_register(char *key,char *config_load, char
         current = __yon__config__strings;
     }
 
-    switch(current->flag1){
-        case -1: save_type = YON_CONFIG_SAVED_REMOVED; break;
-        case 1: save_type = YON_CONFIG_SAVED_CHANGED; break;
-        default: save_type = YON_CONFIG_SAVED_NEW; break;
-    }
     config_load = yon_char_new(config_load);
 
     current->data_type=DICTIONARY_CHAR_TYPE;
@@ -915,6 +929,11 @@ enum YON_CONFIG_SAVED_TYPE yon_config_register(char *key,char *config_load, char
         yon_config_set_ignore(key);
         current->flag1 = 0;
     }
+    switch(current->flag1){
+        case -1: save_type = YON_CONFIG_SAVED_REMOVED; break;
+        case 1: save_type = YON_CONFIG_SAVED_CHANGED; break;
+        default: save_type = YON_CONFIG_SAVED_NEW; break;
+    }
     return save_type;
 }
 
diff --git a/source/libublsettings.h b/source/libublsettings.h
index a0dd4a6..88cafb2 100644
--- a/source/libublsettings.h
+++ b/source/libublsettings.h
@@ -1397,6 +1397,18 @@ config_str yon_config_get_all_keys_no_ignored(int *size);
 */
 int yon_config_set(char *key, void *data);
 
+
+/// @brief Set a regex pattern as a compare mask for saving window
+/// @param key Parameter's key
+/// @param mask_pattern regex pattern;
+/// @return 1 if successful, 0 otherwise
+int yon_config_set_mask_pattern(const char *key, const char *mask_pattern);
+
+/// @brief Get a compare mask for saving window as a regex pattern
+/// @param key Parameter's key
+/// @return newly allocated string of regex pattern or NULL
+char *yon_config_get_mask_pattern(const char *key);
+
 /**yon_config_clean()
  * [EN]
  * Erase all parameters from config;