Convert inline <pre /> to <br />

gistfile1.cs

static string DoPre(string content)
{
    return Regex.Replace(content, @"(<pre[^>]*>)([\s\S]*?)(</pre>)", match =>
    {
        return
            match.Groups[1].Value + 
            String.Join("<br />", match.Groups[2].Value.Split('\n').Select(p => p.Replace(" ", "&nbsp;").Trim()).ToArray()) +
            match.Groups[3].Value;
    });
}