PeoplePicker Configuration for Wildcard Search

Dear all,

My task is, to make peoplepicker able to find AD Users with a wildcard.

E.g.: the user i'm searching for is: "TestUser"

• Samaccountname = Testuser
• Displayname = Testuser
• nothing else is configured for the username (no givenname, no sirname no email....)

The situation in the moment is:

If I'm searching vor Tes --> People Picker is returning the username.
BUT If I'm searching for estuser or *estuser PeoplePicker returns no results.

What i've tried in the meantime is the following STSADM Command, but without any succsess. (without an IIS Reset)
stsadm -o setproperty -pn peoplepicker-searchadcustomquery -pv "(userPrincipalName=*{0}*)(givenName=*{0}*)(sn=*{0}*)(displayName=*{0}*)"

Is there a possibility to configure peoplepicker to return my requested result or do i have no chance to do it this way?

best regards
Thomas