In order to get AD DS group membership for specific user (with filtering by part of group name) you may use PowerShell (don’t forget import Active Directory module by issuing import-module activedirectory before running below’s example):
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Get-ADPrincipalGroupMembership USERNAME | select name | where-object {$_.name -like “*PART_OF_GROUP_NAME*”}
Substitute USERNAME and PART_OF_GROUP_NAME with appropriate values. If you issue just Get-ADPrincipalGroupMembership USERNAME you will get list of all groups in which specified user included (could be long list in large environments).
Similarly you may use Get-ADGroupMember GROUPNAME to get a list of all members for specified group or if you add condition as follows:
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Get-ADGroupMember GROUPNAME | select name | where-object {$_.name -like “*PART_OF_USER_NAME*”}
You will get this user(s) if any included in this group.
Of course you may use old-fashioned net user /domain USERNAME for the same purpose but it tends to truncate long groupnames and output formatting / manipulations possibilities by far less flexible.