using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
 
public class Test
{
	private static readonly Regex rxFirst5Words = new Regex(@"^\W*\w+(?:\W+\w+){4}", RegexOptions.Compiled);
 
	public static void Main()
	{
		var s = "The quick_brown, fox1 jumps over the lazy dog";
    	var result = rxFirst5Words.Match(s);
        if (result.Success)
        	Console.WriteLine(result.Value);
	}
}

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