hashtags

hashtags.cs

public static List<string> ExtractHashtags(string postContent)
{
    var regex = new Regex(@"#\w+");
    return regex.Matches(postContent)
                .Cast<Match>()
                .Select(m => m.Value.TrimStart('#'))
                .Distinct()
                .ToList();
}

public string ContentWithLinks
{
    get
    {
        return Regex.Replace(Content, @"#(\w+)", 
            "<a href='/Ponds/Posts/$1'>#$1</a>");
    }
}