自动识别超链接

public string Url_Rewrite(string Text)
    {
        //用?正?则?表?达?式?识?别?URL超?链?接?
        Regex UrlRegex = new Regex(@"(http:\/\/([\w.]+\/?)\S*)", RegexOptions.IgnoreCase | RegexOptions.Compiled);
        //进?规?则?查?询?
        //Url
        MatchCollection matches = UrlRegex.Matches(Text);
        foreach (Match match in matches)
        {
            Text = Text.Replace(match.Value, string.Format("<a href=\"{0}\" target=\"_blank\">{1}</a>", match.Value, match.Value));
        }
        //用?正?则?表?达?式?识?别?Email地?址?
        Regex EmailRegex = new Regex(@"([a-zA-Z_0-9.-]+\@[a-zA-Z_0-9.-]+\.\w+)", RegexOptions.IgnoreCase | RegexOptions.Compiled);
        matches = EmailRegex.Matches(Text);
        foreach (Match match in matches)
        {
            Text = Text.Replace(match.Value, string.Format("<a href=mailto:{0}>{1}</a>", match.Value, match.Value));
        }
        return Text;
    }
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