Вывод определенной части строки

$Cities = Get-Content -Path c:\samefolder\cities.txt
foreach($City in $Cities)
{
    (использование города)
}

$Cities = Get-Content -Path c:\ps\cities.txt
$ou1  = "(cn=vitia,ou=07users,ou=Кемерово,dc=region,dc=domen,dc.ru"
foreach($City_notTrim in $Cities)
{
    $City = $City_notTrim.Trim()
    if($ou1.Contains($City))
    {
        Write-Host $ou1 "содержит" $City
    }
}
$ou2  = "(cn=vitia,ou=07users,ou=fignya,ou=Красноярск,dc=region,dc=domen,dc.ru"
foreach($City_notTrim in $Cities)
{
    $City = $City_notTrim.Trim()
    if($ou2.Contains($City))
    {
        Write-Host $ou2 "содержит" $City
    }
}
$ou3  = "(cn=vitia,ou=Брест,dc=region,dc=domen,dc.ru"
foreach($City_notTrim in $Cities)
{
    $City = $City_notTrim.Trim()
    if($ou3.Contains($City))
    {
        Write-Host $ou3 "содержит" $City
    }
}
read-host  "`n"

$string = '(cn=vitia,ou=07users,ou=gorod,dc=region,dc=domen,dc=ru)'
$cities = 'gorod','gorod0','gorod1'
((($string.TrimEnd(")").TrimStart("(") -split ',').Where{$_.StartsWith('ou')}).TrimStart("ou=")).Where{$cities -contains $_}

$string = '(cn=vitia,ou=07users,ou=gorod,dc=region,dc=domen,dc=ru)'
$cities = 'gorod','gorod0','gorod1'
$regex = 'ou=([^,]*),'
 
[regex]::Matches($string, $regex) | ForEach-Object {If ($_.Groups[1].Value -in $cities){$_.Groups[1].Value}}

$string = '(cn=vitia,ou=07users,ou=gorod,dc=region,dc=domen,dc=ru)'
$cities = 'gorod','gorod0','gorod1'
$regex = 'ou=([^,]*),'
 
[regex]::Matches($string, $regex) | ForEach-Object {$_.Groups[1].Value} | Where-Object {$_ -in $cities}

$string = '(cn=vitia,ou=07users,ou=gorod,dc=region,dc=domen,dc=ru)'
$cities = 'gorod','gorod0','gorod1'
$regex = 'ou=([^,]*),'
 
[regex]::Matches($string, $regex) | ForEach-Object {$_.Groups[1].Value} | Where-Object {$_ -match ($cities -join '|')}