I was searching for nodes(in node browser) with an attribute containing value *pks*(@xyz:attribute\:*pks*)and in result am getting the node with value pkk. Below is few test cases and results
search keyword results
*pks* node containing "pkk"
*pkq* no results found
*pkk* node containing "pkk"
The same can be replicated with cm:name field also.
For cm:name:*xls* -- > results have nodes with xls, xle, xlu
Alfresco version : 18.104.22.168