MySQL: Function to split string based on a separator and an extraction index

fn_split_string.sql

/*
Usage:
SELECT fn_split_string('20156 2018-01-25',' ',1) AS one, fn_split_string('20156 2018-01-25',' ',2) AS two;
  +-------+------------+
  | one   | two        |
  +-------+------------+
  | 20156 | 2018-01-25 |
  +-------+------------+
*/
CREATE FUNCTION `fn_split_string`(
	str VARCHAR(255) ,
	delim VARCHAR(12) ,
	pos INT
) RETURNS varchar(255) CHARSET utf8
RETURN REPLACE(
    SUBSTRING(
      SUBSTRING_INDEX(str, delim, pos),
      CHAR_LENGTH(
        SUBSTRING_INDEX(str , delim , pos - 1)
      ) + 1
    ),
    delim ,
    ''
)