mysql substitua um personagem em uma string
UPDATE users SET first_name = REPLACE (first_name, 'search', 'replace_with') where id > 0;
Grepper
UPDATE users SET first_name = REPLACE (first_name, 'search', 'replace_with') where id > 0;UPDATE
table_name
SET
column_name = REPLACE(column_name, 'text to find', 'text to replace with')
WHERE
column_name LIKE '%text to find%';