using System;

using System.Text.RegularExpressions;

​

string input = "Hello, World!";

Regex regex = new Regex("Hello");

MatchCollection matches = regex.Matches(input);

​

if (matches.Count > 0)

{

    Console.WriteLine("Pattern(s) found:");

    foreach (Match match in matches)

    {

        Console.WriteLine($"\t {match.Value}");

    }

}

else

{

    Console.WriteLine("Pattern not found.");

}