Gets a list of meetup RSVPs using the meetup API.

Get-MeetupRsvps.ps1

function Get-MeetupRsvps([string]$eventId, [string]$apiKey) {
    $nameWord = "[\w-']{2,}"
    $regex = "^(?'first'$nameWord) ((\w\.?|($nameWord )+) )?(?'last'$nameWord)|(?'last'$nameWord), ?(?'first'$nameWord)( \w\.|( $nameWord)+)?$"

    function Get-AttendeeInfo {
        process {
            $matches = $null
            $answer = $_.answers.answers_item
        
            if(-not ($_.name -match $regex)) { $answer -match $regex | Out-Null }
            
            return New-Object PSObject -Property @{
                'FirstName' = $matches.first
                'LastName' = $matches.last
                'RSVPName' = $_.name
                'RSVPAnswer' = $answer
                'RSVPGuests' = $_.guests
            }
        }
    }

    $xml = [Xml](New-Object Net.WebClient).DownloadString("https://api.meetup.com/rsvps.xml?event_id=$eventId`&key=$apiKey")
    $xml.SelectNodes('/results/items/item[response="yes"]') | Get-AttendeeInfo | select FirstName, LastName, RSVPName, RSVPAnswer, RSVPGuests
}