Added function lastIndexOf

Functions_and_procedures/lastindexof.sql

@@ -0,0 +1,63 @@
+SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='STRICT_TRANS_TABLES';
+
+DROP FUNCTION IF EXISTS lastIndexOf;
+
+DELIMITER //
+
+CREATE FUNCTION lastIndexOf ( stringparam VARBINARY(255), targetstr VARBINARY(255)) 
+RETURNS TINYINT UNSIGNED 
+DETERMINISTIC
+NO SQL
+SQL SECURITY DEFINER
+COMMENT 'Returns the position of the last occurrence of substring targetstr in string stringparam (v1.00)'
+
+/*****************************************************************************
+*
+* DESCRIPTION:	Returns the position of the last occurrence of substring targetstr in string stringparam (or 0 if not found or stringparam is null)
+* 
+* AUTHOR:		Benoît St-Jean <bstjean@yahoo.com>
+* URL:		 	http://www.endormitoire.wordpress.com
+* VERSION: 		1.00
+*
+* USAGE:		SELECT lastIndexOf('ab00ab00ab00', 'ab');
+* RESULT: 		9
+*
+* PARAMETERS:	stringparam 	string to be searched
+*				targetstr		string we are trying to locate in stringparam				
+*
+* RETURN:		TINYINT UNSIGNED
+*
+* NOTES:		This function is CASE SENSITIVE !!!
+*		
+******************************************************************************/
+
+BEGIN
+DECLARE foundAnother TINYINT UNSIGNED;
+DECLARE oldIndex TINYINT UNSIGNED;
+DECLARE newIndex TINYINT UNSIGNED;
+
+SET foundAnother = 1;
+SELECT LOCATE(targetstr, stringparam) INTO oldIndex;
+
+IF (oldIndex IS NULL) THEN
+	RETURN 0;
+ELSEIF (oldIndex = 0) THEN 
+	RETURN 0;
+END IF;
+
+
+WHILE foundAnother DO
+	SET newIndex = LOCATE(targetstr, stringparam, oldIndex+1);
+	IF newIndex > oldIndex THEN
+		SET oldIndex = newIndex;
+	ELSE
+		SET foundAnother = 0;
+	END IF;
+END WHILE;
+
+RETURN oldIndex;
+END //
+
+DELIMITER ;
+
+SET SQL_MODE=@OLD_SQL_MODE;

README.md

@@ -10,6 +10,7 @@ A collection of useful (I hope!) functions, stored procedures and SQL scripts to
 **initcap** : Returns a character string with the first letter of each word converted to uppercase. This function EXACTLY mimics INITCAP of Oracle.  
 **isProvince** : Returns 1 if argument is a Canadian 2-letter province code, 0 otherwise.  
 **isState** : Returns 1 if argument is an American 2-letter state code, 0 otherwise.  
+**lastindexof** : Returns the position of the last occurrence of a substring in a source string.  
 **occurrences** : Returns the number of occurrences of a search string inside a source string.    
 **rot5** : Encodes/decodes a string with the ROT5 substitution cipher.  
 **rot13** : Encodes/decodes a string with the ROT13 substitution cipher.