using System;

using System.Text.RegularExpressions;

​

string multiLineText = 

    """

    This is some sample text.

    # This is a comment.

    And here's another line.

    # Another comment.

    """;

​

foreach (var comment in FindComments(multiLineText))

{

    Console.WriteLine(comment);

}

​

static string[] FindComments(string input)

{

    // Use RegexOptions.Multiline to treat ^ as the start of each line.

    Regex commentRegex = new Regex("^#.*$", RegexOptions.Multiline);

​

    var matches = commentRegex.Matches(input);

    string[] comments = new string[matches.Count];

    for (int i = 0; i < matches.Count; i++)

    {

        comments[i] = matches[i].Value;

    }

​

    return comments;

}

​