using System;

using System.Linq;

using System.Text.RegularExpressions;

using System.Collections.Generic;

​

public static class Program

{

    public static void Main()

    {

        var source = new [] {"test", "test1", "test2", "otherTest"};

        var grep = Curry<Regex, IEnumerable<string>, IEnumerable<string>>(

                    (regex, list) => from s in list

                                     where regex.Match(s).Success

                                     select s);

        var grepDigit = grep(new Regex(@"\d"));

        foreach(var withDigit in grepDigit(source))

        {

            Console.WriteLine(withDigit);

        }

    }

    public static Func<A, Func<B, R>> Curry<A, B, R>(this Func<A, B, R> f)

    {

      return a => b => f(a, b);

    }

}