Remove all Azure AD groups starting with a given prefix

rmGroups.ps1

# This script requires :
#  1. the Azure AD Powershell module: Install-Module -Name AzureADPreview
#  2. an authenticated user: Connect-AzureAD

$uid = ""
$groupPrefix = "GroupNamePrefix"

$groups = Get-AzureADMSGroup
$groups | Select-Object -Skip 3 | Where-Object {
    $_ -match '(\d+)\s+(\d+)\s+(.*?)\s+([a-z]+(?:-[a-z0-9]+){2,})\s+(.*)'
} | ForEach-Object {
    New-Object -Type PSObject -Property @{
    'Id' = $matches[0]
    'DisplayName' = $matches[1]
    'Description' = $matches[2]
  }
}

forEach($group in $groups){
  if ($group.DisplayName.StartsWith($groupPrefix)) {

    # remove group
    Remove-AzureADGroup -ObjectId $group.Id
    Write-Output "removed group: $($group.DisplayName) $($group.Id)"
  }
}