SQL InitCap that Uppercase some special words - mysql

Question

How can i modify this InitCap function so that it always will uppercase AB when its in the end of the string and has a space before it.
test Ab <-- should display AB
testab <-- should display ab
abtest <-- should displat ab
DELIMITER $$
DROP FUNCTION IF EXISTS `CapitializeFirstCharInEveryWord`$$
CREATE FUNCTION `CapitializeFirstCharInEveryWord`(x char(100)) RETURNS char(100) CHARSET utf8
BEGIN
SET #str='';
SET #l_str='';
WHILE x REGEXP ' ' DO
SELECT SUBSTRING_INDEX(x, ' ', 1) INTO #l_str;
SELECT SUBSTRING(x, LOCATE(' ', x)+1) INTO x;
SELECT CONCAT(#str, ' ', CONCAT(UPPER(SUBSTRING(#l_str,1,1)),LOWER(SUBSTRING(#l_str,2)))) INTO #str;
END WHILE;
RETURN LTRIM(CONCAT(#str, ' ', CONCAT(UPPER(SUBSTRING(x,1,1)),LOWER(SUBSTRING(x,2)))));
END$$

Answer 1

You want to capitalize last word in string? You can do it in simple way. Description in comments.
CREATE FUNCTION `CapitalizeLastWord`(x char(100)) RETURNS char(100) CHARSET utf8
BEGIN
-- detect has x space
SET #space_pos_reverse = LOCATE(' ', REVERSE(x));
-- if not return unchanged x
IF #space_pos_reverse = 0 THEN RETURN x;
END IF;
-- getting last space position
SET #last_space_pos = LENGTH(x)-#space_pos_reverse+1;
-- split x to 2 parts, 2nd part gettin UPPER
RETURN CONCAT(SUBSTRING(x, 1, #last_space_pos), UPPER(SUBSTRING(x, #last_space_pos+1)) );
END$$