function Select-AlkamiAppServers {
<#
.SYNOPSIS
Filters app tier App servers from a list of servers by hostname convention.
#>
    [CmdletBinding()]
    Param(
        [AllowNull()]
        [AllowEmptyCollection()]
        [Parameter(Mandatory=$true)]
        [string[]]$Servers
    )

    $result = ($Servers -match "\b(APP|ALK-PLA1-QA)")
    if ($result -eq $false) {
        return $null
    }
    return $result
}