\s Match a white-space character. : Regex Match « Regular Expression « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. Regular Expression
3. Regex Match

using System;
using System.Text.RegularExpressions;

public class Example
{
   public static void Main()
   {
      string pattern = @"gr[ae]y\s\S+?[\s|\p{P}]";
      string input = "this is a test.";
      MatchCollection matches = Regex.Matches(input, pattern);
      foreach (Match match in matches)
         Console.WriteLine(match.Value);
   }
}