Use ADSI to Check if a User is a Member of an AD Group

Other Posts in this Series:

• Use ADSI to List Nested Members of an AD Group (Updated)
• Use ADSI and FromFileTime to Convert Datetime Attributes in Active Directory
• Use ADSI to Find Logon Workstations in Active Directory
• Search Active Directory using PowerShell ADSISearcher Filters
• Use PowerShell ADSI to Search Users in Active Directory

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This post will provides an example of how we can use ADSI to check if a user is a member of an AD Group using the [ADSISearcher] type accelerator:

#remember that this is used as a regular expression (using -match), so escape any brackets etc with a back slash
$ADGroup = "Example_AD_Group"
$userName = "AlkaneUser"
    
#check if user is a member of the group
$ADGroupObj = (([ADSISearcher] "(&(objectCategory=person)(objectClass=user)(sAMAccountName=$userName))").FindOne().properties.memberof -match "CN=$ADGroup,")

if ($ADGroupObj -and $ADGroupObj.count -gt 0)
{
    #user is a member - do something!
}