正则

using System;

using System.Text.RegularExpressions;

namespace CommLayer

{

       /// <summary>

       /// 自动给邮件地址或email地址加上url

       /// </summary>

       public class HyperlinkUrl

       {

              private static Regex urlregex = new Regex("(http:\/\/([\w.]+\/?)\S*)",

                     RegexOptions.IgnoreCase|RegexOptions.Compiled);

              private static Regex emailregex = new Regex("([a-zA-Z_0-9.-]+\[a-zA-Z_0-9.-]+\.\w+)",

                     RegexOptions.IgnoreCase|RegexOptions.Compiled);

              public HyperlinkUrl()

              {                  

              }

              /// <summary>

              /// 生成带连接的字符串

              /// </summary>

              /// <param name="link">需要生成带连接地址的字符串</param>

              /// <returns>经过转换的字符串</returns>

              public static string GenHyperlinkUrl(string link)

              {

                     link = emailregex.Replace(link, "<a href=mailto:$1>$1</a>");

                     link = urlregex.Replace(link, "<a href=\"$1\" target=\"_blank\">$1</a>");

                     return link;

              }

       }

}