using System;

using System.Text.RegularExpressions;

using System.Collections.Generic;

public class Program

{

    public static IEnumerable<string> FindParams(string s) {

        Regex re = new Regex(@"@[a-zA-Z0-9_]+");

        var matches = re.Matches(s);

        foreach (var match in matches)

            yield return match.ToString();

    }

    public static void Main()

    {

        var pars = FindParams("insert into contact_log(contact_id,contact,message,utc,status_code,status_message,source) values(@contact_id,@contact,@message,@utc,@status_code,@status_message,@source)");

        foreach (var p in pars)

            Console.WriteLine(p);

    }

}