Out of the box dashboard filters provide an option to perform basic wildcard searches. They can be entered in the search box that appears in the drop down of the filter widget as shown in the below screenshot. The screen recording shows the wildcard search in action.
These searches are generally case insensitive and will search partial strings as well, which means:
“alan” will find “Alan Barnes” as well as “James Galang”
note: please hit ENTER to initiate search