Multi-Value Delimiter
When the developer chooses to use a delimiter other than the default of semicolon ( ; ) they may provide the multiValueDelimiter attribute. When providing this attribute, they must also pass this same value as the final parameter to the ${multiSelectFilter} macro. Supported delimiters are: ";", "," and "~"
If you want to use a delimiter of comma ',' be sure to use the escape character '\' before delimiter.
For example: ${multiSelectFilter:TEST_STRING, TEST_STRING like $TEST_STRING$, OR, '\,'}