REGEXP_REPLACE(expression, pattern, replacement[, position[, occurrence[, match_type]]])
Example 1 - remove all "-" characters
SELECT REGEXP_REPLACE( fieldname, '-', '' ) AS newfieldname FROM tablenameWITH t AS (SELECT 'aaa <b>bbb</b> ccc' AS teststring FROM dual)
SELECT
teststring,
regexp_replace(teststring, '<.+>') AS reg1,
regexp_replace(teststring, '<.*>') AS reg2,
regexp_replace(teststring, '<.*?>') AS reg3
FROM t
TESTSTRING REG1 REG2 REG3
aaa <b>bbb</b> ccc aaa ccc aaa ccc aaa bbb ccc
DELIMITER $$
CREATE FUNCTION `regex_replace`(pattern VARCHAR(1000),replacement VARCHAR(1000),original VARCHAR(1000))
RETURNS VARCHAR(1000)
DETERMINISTIC
BEGIN
DECLARE temp VARCHAR(1000);
DECLARE ch VARCHAR(1);
DECLARE i INT;
SET i = 1;
SET temp = '';
IF original REGEXP pattern THEN
loop_label: LOOP
IF i>CHAR_LENGTH(original) THEN
LEAVE loop_label;
END IF;
SET ch = SUBSTRING(original,i,1);
IF NOT ch REGEXP pattern THEN
SET temp = CONCAT(temp,ch);
ELSE
SET temp = CONCAT(temp,replacement);
END IF;
SET i=i+1;
END LOOP;
ELSE
SET temp = original;
END IF;
RETURN temp;
END$$
DELIMITER ;