转自http://www.cnblogs.com/dudu/archive/2007/12/19/1006119.html,收藏一下. public static string ShowUrls(string text) { //代码来自博客园 http://www.cnblogs.com Regex linkRegex = new Regex(" href\\s*=\\s*(?:(?:\\\"(?<url>[^\\\"]*)\\\")|(?<url>[^\\s]* ))", RegexOptions.IgnoreCase | RegexOptions.Compiled); MatchCollection linkMatchs = linkRegex.Matches(text); string pattern = @"(http|ftp|https):\/\/[\w]+(.[\w]+)([\w\-\.,@?^=%&:/~\+#]*[\w\-\@?^=%&/~\+#])"; MatchCollection matchs; string clearText = Regex.Replace(text, "<[^>]*>",string.Empty, RegexOptions.Compiled);//清除html标记 matchs = Regex.Matches(clearText, pattern, RegexOptions.IgnoreCase | RegexOptions.Compiled); bool flag = true; foreach (Match m in matchs) { string link = "<a href=\"" + m.ToString() + "\" target=\"_new\">" + m.ToString() + "</a>"; if (linkMatchs.Count > 0) { foreach (Match linkMatch in linkMatchs) { if (linkMatch.Value.IndexOf(m.Value) > -1) { flag = false; break; } } } if(flag) { text = text.Replace(m.ToString(), link); } } return text; } 转载于:https://www.cnblogs.com/wysky/archive/2007/12/21/1008973.html