Convert HTML to plain text in C#

HtmlToPlainText.cs

private static readonly Regex[] _htmlReplaces = new[] {
    new Regex(@"<script\b[^<]*(?:(?!</script>)<[^<]*)*</script>", RegexOptions.Compiled | RegexOptions.Singleline, TimeSpan.FromSeconds(1)),
    new Regex(@"<style\b[^<]*(?:(?!</style>)<[^<]*)*</style>", RegexOptions.Compiled | RegexOptions.Singleline, TimeSpan.FromSeconds(1)),
    new Regex(@"<[^>]*>", RegexOptions.Compiled),
    new Regex(@" +", RegexOptions.Compiled)
};

public static string HtmlToPlainText(string html)
{
    foreach (var r in _htmlReplaces)
    {
        html = r.Replace(html, " ");
    }
    var lines = html
        .Split(new[] { '\r', '\n' })
        .Select(_ => WebUtility.HtmlDecode(_.Trim()))
        .Where(_ => _.Length > 0)
        .ToArray();
    return string.Join("\n", lines);
}