using System;

using System.Collections.Generic;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        // output would be set by earlier code

        var output = @"Profiles on interface Wi-Fi:

​

Group policy profiles (read only)

---------------------------------

<None>

​

User profiles

-------------

All User Profile     : GuestFSN

All User Profile     : CorporateWifi

All User Profile     : ATT3122";

        var regex = new Regex(@"All User Profile[\s]+: (.*)");

        var resultList = new List<string>();

        foreach (Match match in regex.Matches(output))

        {

            resultList.Add(match.Groups[1].ToString());

        }

        Console.WriteLine(string.Join(", ", resultList));

    }

}