Mysql search & replace with random characters - mysql

Question

I have in text some URLS src="https://example.com/public/images/someimage.jpg?itok=WDGFySy"
I need remove in every url this garbage token ?itok=WDGFySy, all tokens obviously are random :).
I try do it directly in database like this:
UPDATE wp_posts SET post_content = REPLACE(post_content, 'itok=[[:xdigit:]]{8}', '') WHERE post_content LIKE 'itok=[[:xdigit:]]{8}
';
But i cant find any of this tokens like this. LIKE this [a-fA-F0-9]{8} also wont help. Any advice? Thank you for any suggestions.

Answer 1

You can only use regex if you have MySQL 8.0.
However, if your links are in separate fields, it is possible to create and use SP to clean them up:
DELIMITER $$
CREATE FUNCTION CLEANUP(
aString VARCHAR(255)
, aName VARCHAR(15)
)
RETURNS VARCHAR(255)
BEGIN
SET #u = SUBSTRING_INDEX(aString, '?', 1);
SET #q = SUBSTRING_INDEX(aString, '?', -1);
IF #q = aString THEN
RETURN aString; -- no '?' char found
ELSE
SET #f = LOCATE(CONCAT(aName, '='), #q);
SET #query = IF(#f > 1, SUBSTR(#q, 1, #f - 1), '');
IF #f > 0 THEN
SET #t = LOCATE('&', #q, #f + LENGTH(aName) + 1);
IF #t > 0 THEN
SET #query = CONCAT(#query, SUBSTR(#q, #t + 1));
END IF;
END IF;
IF #query = '' THEN
RETURN #u;
ELSE
RETURN CONCAT(#u, '?', TRIM('&' FROM #query));
END IF;
END IF;
END
$$
DELIMITER ;
Then:
SELECT
CLEANUP('https://example.com/public/images/someimage.jpg?itok=WDGFySy&b=2', 'itok')
, CLEANUP('https://example.com/public/images/someimage.jpg?itok=WDGFySy', 'itok')
, CLEANUP('https://example.com/public/images/someimage.jpg?a=1&itok=WDGFySy', 'itok')
, CLEANUP('https://example.com/public/images/someimage.jpg?a=1&itok=WDGFySy&b=2', 'itok')
;