to have a much more powerful extraction tool based on tagged fields from any substring with patterns limits and not positions needing to be calculated as in llGetSubString() or basical conversions as in llCSV2List()
example :
string s = "comments mixed with fields and any stuff [[ field_1, field_2, field_3 ]] blabla";
list l = llSubString2List( s, "[[", "]]", "," );
will result in list l = [ filed_1, field_2, field_3 ]
i-e easy tool to extract data from user input or notecards or any text fields in prims etc.