Creating item with dynamic SNMP indexes syntax is clear:

<base OID of data>["index","<base OID of index>","<string to search for>"]

Would be useful to have one more parameter, e.g. operator:

<base OID of data>["index","<base OID of index>","<string to search for>","<operator>"]

operators:
"eq" - The string is used for exact match with a value when doing lookup. Case sensitive. (this is current way of working)
"like" - match is less strict, like grep