In the script you can read them into a new table, with the subfield() function used on the sting to strip it out into its separate elements:
stripped_out_table:
LOAD:
original_string, // key back to host table
rowno() AS sorting_field,
subfield(original_string,'->') AS string_element
RESIDENT host_table;
This generates a table with one row for each value. Note the rowno() field needed to later sort it.
Join the multiple values stored in this seperate table back onto the host table using a concat() function with the sort field set on it. Something like:
LEFT JOIN (host_table)
LOAD
original_string, // key to the stripped out table
concat(string_element,sorting_field) AS reversed_field
RESIDENT stripped_out_table
GROUP BY original_string;
Drop the stripping table afterwards. See attached.
Jonathan
