It is being used to take an input (in a single chunk) and tokenize it (split into smaller pieces) based on a given delimiter.
I.e. tokenizing "1,2.4,3" on the comma yields an array of three values, "1", "2.4", and "3". Tokenizing the same input on the period yields an array of two values, "1,2" and "4,3".
Please note per the documentation that use of the jelly:util tag library is deprecated.
Reference: https://docops.ca.com/ca-ppm/14-3/reference/xml-open-gateway-xog-development/gel-tag-library-reference/utility-tag-libra…