Script to export attendees from an Facebook Event ICS (iCalendar) file to a CSV file.

attendees2csv.groovy

#!/usr/bin/env groovy

import java.util.regex.*

def inviteFileName = args[0]
def inviteFile = new File(inviteFileName)

def pattern = Pattern.compile('^ATTENDEE;CN=(.*);PARTSTAT=ACCEPTED:(.*)')
inviteFile.eachLine { line ->
    def m = pattern.matcher(line)
    if (m.matches()) {
        println "${m.group(1)};${m.group(2)}"
    }
}