Currently Administrators/Owners and Moderators have the ability to search the Members screen which is unavailable to Subscribers.
The Directory screen, available to Administrators/Owners, Moderators and Subscribers doesn't.
I request that the Directory page have Search capability also as depicted in modified screen shot below.
Search should be able to find Username and/or email using partial information without an asterisk.
A search for "Dave" would include all Daves in the directory as well as any email addresses with dave embedded George@... (fictional)
This request is based on the long running and evolving thread (9+ months, 40+ posts) "Finding posts by a member" with the goal of providing a concise suggestion.