main
new
SELECT * FROM `proc`
`x` VARCHAR(255), `delim` VARCHAR(12), `pos` INT
varchar(255) CHARSET utf8mb4 COLLATE utf8mb4_general_ci
BEGIN RETURN TRIM( REPLACE( SUBSTRING( SUBSTRING_INDEX(x, delim, pos), LENGTH(SUBSTRING_INDEX(x, delim, pos - 1)) + 1 ), delim, '' ) ); END