function Get-IISSiteList {

<#
.SYNOPSIS
    Returns a list of all Alkami sites in IIS

.PARAMETER adminSitesOnly
    [switch] Opens only Admin sites on the server.  Cannot be used with the IncludeIPSTS parameter

.PARAMETER returnIPSTS
    [switch] IPSTS is excluded by default, but will be returned if this parameter is set.  Cannot be used
    with the AdminOnly parameter
#>
    [CmdletBinding(DefaultParameterSetName = 'NoParameters')]
    [CmdletBinding()]
    Param(
        [Parameter(ParameterSetName = 'AdminOnly', Mandatory = $true)]
        [Parameter(Mandatory = $false)]
        [Alias("AdminOnly")]
        [switch]$adminSitesOnly,

        [Parameter(ParameterSetName = 'IncludeIPSTS', Mandatory = $true)]
        [Parameter(Mandatory = $false)]
        [Alias("IncludeIPSTS")]
        [switch]$returnIPSTS
    )

    $mgr = New-Object Microsoft.Web.Administration.ServerManager

    [Regex]$siteMatchRegex = ".*WebClient.*"

    if ($adminSitesOnly.IsPresent) {

        [Regex]$siteMatchRegex = ".*WebClientAdmin$"

    } elseif ($returnIPSTS.IsPresent) {

        [Regex]$siteMatchRegex = "(.*WebClient.*|.*IPSTS)"
    }

    [array]$sites = $mgr.Sites | Where-Object {$_.Applications["/"].VirtualDirectories["/"].PhysicalPath -match $siteMatchRegex}

    return $sites
}