diff --git a/source/packages/oos_util_string.pkb b/source/packages/oos_util_string.pkb
index 7021897..2096f34 100644
--- a/source/packages/oos_util_string.pkb
+++ b/source/packages/oos_util_string.pkb
@@ -331,7 +331,106 @@ as
     return l_return;
 
   end sprintf;
-
+  
+  
+  /**
+   * Does string replacement of keys by values
+   *
+   * @example
+   * SELECT oos_util_string.sprintf('Hello {firstName} {lastName}!', 
+   *                                 t_tab_key_value(t_rec_key_value('firstName', 'Nuno'),
+   *                                                 t_rec_key_value('lastName', 'Alves')
+   *                                                 )
+   *                               ) demo
+   * FROM dual;
+   *
+   * DEMO
+   * ------------------------------
+   * Hello Nuno Alves!
+   *
+   * @issue #134
+   *
+   * @author Nuno Alves
+   * @created 12-Nov-2016
+   * @param p_str Messsage to format using %s and %d replacement strings
+   * @param p_key_values Nested table of key value pairs to be replaced
+   * @param p_left_pattern Left string pattern, '{' by default
+   * @param p_right_pattern Right string pattern, '}' by default
+   * @return p_msg with strings replaced
+   */
+  function sprintf(
+    p_str in varchar2,
+    p_key_values in t_tab_key_value,
+    p_left_pattern in varchar2 default '{',
+    p_right_pattern in varchar2 default '}')
+    return varchar2
+  as
+    l_return varchar2(4000);
+  begin
+    l_return := p_str;
+    if p_key_values IS NOT NULL AND p_key_values.exists(1)
+    then
+      for i in 1 .. p_key_values.count
+      loop
+        l_return := REPLACE(l_return, p_left_pattern || p_key_values(i).key || p_right_pattern, p_key_values(i).value);
+      end loop;
+    end if;
+    
+    return l_return;
+  end sprintf;
+  
+  
+  /**
+   * Does string replacement by string position
+   *
+   * @example
+   * select oos_util_string.sprintf('hello {1} {2}!', t_tab_vc2('Nuno','Alves')) demo
+   * from dual;
+   *
+   * DEMO
+   * ------------------------------
+   * Hello Nuno Alves!
+   *
+   * select oos_util_string.sprintf('hello {2} {1}!', t_tab_vc2('Nuno','Alves')) demo
+   * from dual;
+   *
+   * DEMO
+   * ------------------------------
+   * Hello Alves Nuno!
+   * @issue #134
+   *
+   * @author Nuno Alves
+   * @created 12-Nov-2016
+   * @param p_str Messsage to format using %s and %d replacement strings
+   * @param p_tab_vc2 Nested table of replacement strings
+   * @param p_left_pattern Left string pattern, '{' by default
+   * @param p_right_pattern Right string pattern, '}' by default
+   * @return p_msg with strings replaced
+   */
+  function sprintf(
+    p_str in varchar2,
+    p_tab_vc2 in t_tab_vc2,
+    p_left_pattern in varchar2 default '{',
+    p_right_pattern in varchar2 default '}')
+    return varchar2
+  as
+    l_tab_key_value t_tab_key_value := t_tab_key_value();
+    l_return varchar2(4000);
+  begin
+    l_return := p_str;
+    if p_tab_vc2 IS NOT NULL AND p_tab_vc2.exists(1)
+    then
+      for i in 1 .. p_tab_vc2.count
+      loop
+        l_tab_key_value.extend(1);
+        l_tab_key_value(i) := t_rec_key_value(i, p_tab_vc2(i));
+      end loop;
+    end if;
+    
+    l_return := sprintf(l_return, l_tab_key_value, p_left_pattern, p_right_pattern);
+    
+    return l_return;
+  end sprintf;
 
   /**
    * Converts delimited string to array
diff --git a/source/packages/oos_util_string.pks b/source/packages/oos_util_string.pks
index 8b19faf..005bf6c 100644
--- a/source/packages/oos_util_string.pks
+++ b/source/packages/oos_util_string.pks
@@ -70,6 +70,20 @@ as
     p_s9 in varchar2 default null,
     p_s10 in varchar2 default null)
     return varchar2;
+    
+  function sprintf(
+    p_str in varchar2,
+    p_key_values in t_tab_key_value,
+    p_left_pattern in varchar2 default '{',
+    p_right_pattern in varchar2 default '}')
+    return varchar2;
+    
+  function sprintf(
+    p_str in varchar2,
+    p_tab_vc2 in t_tab_vc2,
+    p_left_pattern in varchar2 default '{',
+    p_right_pattern in varchar2 default '}')
+    return varchar2;
 
   function string_to_table(
     p_string in clob,
diff --git a/source/types/T_REC_KEY_VALUE.sql b/source/types/T_REC_KEY_VALUE.sql
new file mode 100644
index 0000000..7743230
--- /dev/null
+++ b/source/types/T_REC_KEY_VALUE.sql
@@ -0,0 +1,13 @@
+--------------------------------------------------------
+--  DDL for Type T_REC_KEY_VALUE
+--------------------------------------------------------
+
+  CREATE OR REPLACE TYPE "T_REC_KEY_VALUE" 
+AS
+  OBJECT
+  (
+    KEY   VARCHAR2(4000),
+    VALUE VARCHAR2(4000)
+  );
+
+/
diff --git a/source/types/T_TAB_KEY_VALUE.sql b/source/types/T_TAB_KEY_VALUE.sql
new file mode 100644
index 0000000..542f621
--- /dev/null
+++ b/source/types/T_TAB_KEY_VALUE.sql
@@ -0,0 +1,7 @@
+--------------------------------------------------------
+--  DDL for Type T_TAB_KEY_VALUE
+--------------------------------------------------------
+
+  CREATE OR REPLACE TYPE "T_TAB_KEY_VALUE" AS TABLE OF T_REC_KEY_VALUE;
+
+/
diff --git a/source/types/T_TAB_VC2.sql b/source/types/T_TAB_VC2.sql
new file mode 100644
index 0000000..b587117
--- /dev/null
+++ b/source/types/T_TAB_VC2.sql
@@ -0,0 +1,7 @@
+--------------------------------------------------------
+--  DDL for Type T_TAB_VC2
+--------------------------------------------------------
+
+  CREATE OR REPLACE TYPE "T_TAB_VC2" as table of varchar2(4000);
+
+/