查找严格以$开头的单词,Regex C#

using System;
using System.Text.RegularExpressions;

class Program
{
    static void Main(string[] args)
    {
        string input = "$hello $world $regex";
        string pattern = @"\$\w+";

        MatchCollection matches = Regex.Matches(input, pattern);

        foreach (Match match in matches)
        {
            Console.WriteLine(match.Value);
        }
    }
}