Export AD OU's Users and Groups & Import to test AD with a new domain name

Well this was a fun task, export Active Directory OU's, all users and groups and import everything into a new test active directory with a different domain name.

First export every thing I need:
-OU's:

Get-ADOrganizationalUnit -filter * | select Name,DistinguishedName | Export-csv -path C:\temp\OUexport.csv -NoTypeInformation

-Users: (per specific OU)

Get-ADUser -Filter * -SearchScope OneLevel -SearchBase "OU=Users,DC=domain,DC=lan" -Properties CanonicalName,CN,DisplayName,GivenName,Name,Surname | Export-Csv "C:\Temp\PeopleExport.csv"
Get-ADUser -Filter * -SearchScope OneLevel -SearchBase "OU=External,OU=Users,DC=domain,DC=lan" -Properties CanonicalName,CN,DisplayName,GivenName,Name,Surname | Export-Csv "C:\Temp\ExternalExport.csv"
Get-ADUser -Filter * -SearchScope OneLevel -SearchBase "OU=Regular Accounts,OU=Users,DC=domain,DC=lan" -Properties CanonicalName,CN,DisplayName,GivenName,Name,Surname | Export-Csv "C:\Temp\RegularAccountsExport.csv"
Get-ADUser -Filter * -SearchScope OneLevel -SearchBase "OU=RandomName,OU=External,OU=Users,DC=domain,DC=lan" -Properties CanonicalName,CN,DisplayName,GivenName,Name,Surname | Export-Csv "C:\Temp\RandomNameExternalExport.csv"

-Groups:

Get-ADgroup -filter * | select Name,DistinguishedName,samaccountname,groupcategory,groupscope | Export-csv -path "C:\temp\GroupsExport.csv"

Then copy the .csv's to the new domain controller in C:\Temp.
Go through the files an find and replace the domainname to the new domainname.

You have to do something extra for the Group's.
In Notepad++ search and replace the CN- value for the DistinguishedName value.
It will look like this in the csv file:
"Name","DistinguishedName","samaccountname","groupcategory","groupscope"
"HelpServicesGroup","CN=HelpServicesGroup,DC=NewDomain,DC=local","HelpServicesGroup","Security","DomainLocal"

But it needs to be:

"Name","DistinguishedName","samaccountname","groupcategory","groupscope"
"HelpServicesGroup","DC=NewDomain,DC=local","HelpServicesGroup","Security","DomainLocal"

This is because the CN does not exist yet.

To replace the "CN=*," value use this in notepad++: \CN=.*?,

Where "\CN=" searches for "CN=", "*" searches for everything between "=" and "," and "?," stops the search where the "," is found.

Then import:
-OU's:

#Import AD Module - RSAT must be installed or run from DC
Import-Module ActiveDirectory
#Varibale location for CSV file
$ous = Import-Csv -Path "C:\temp\OUexport.csv"
# For each function to create OU's 
foreach ($ou in $ous)  
{               
# Function Variables
    $ouname = $ou.name
    $oudn = $ou.DistinguishedName
# Function
    New-ADOrganizationalUnit -Name $ouname -Path $oudn  -ManagedBy 'domain admins'
}

-Users:

Import-Csv .\PeopleExport.csv | New-ADUser -Enabled $True -Path 'OU=People,DC=sapgrc,DC=local' -AccountPassword (ConvertTo-SecureString Pass123 -AsPlainText -force)            
Import-Csv .\externenExport.csv | New-ADUser -Enabled $True -Path 'OU=Externen,OU=People,DC=sapgrc,DC=local' -AccountPassword (ConvertTo-SecureString Pass123 -AsPlainText -force)            
Import-Csv .\algemeneaccountsexport.csv | New-ADUser -Enabled $True -Path 'OU=Algemene Accounts,OU=People,DC=sapgrc,DC=local' -AccountPassword (ConvertTo-SecureString Pass123 -AsPlainText -force)            
Import-Csv .\testexternenExport.csv | New-ADUser -Enabled $True -Path 'OU=TEST,OU=Externen,OU=People,DC=sapgrc,DC=local' -AccountPassword (ConvertTo-SecureString Pass123 -AsPlainText -force)

-Groups:

#Import AD Module - RSAT must be installed or run from DC            
Import-Module ActiveDirectory            
#Import CSV            
$csv = Import-Csv -Path "C:\Temp\GroupsExport.csv"            
#Loop through all items in the CSV            
ForEach ($item In $csv)            
{            
    #Create the group if it doesn't exist            
    $create = New-ADGroup -Path $item.DistinguishedName -SamAccountName $item.SamAccountName -GroupCategory $item.GroupCategory -GroupScope $item.GroupScope -Name $item.Name             
    Write-Host "Group $($item.Name) created!"            
}            

And there you have it.