求检测网址的正则表达式

Question

问题描述：
只有如下的网址是正确的，
http://192.168.104.240/gengliang/
http://192.168.104.240:3000/ 
http://eip.sina.com.cn/eiptest/
http://eip.163.com.cn/
http://163.com.cn/如果不是以上的网址，需要做转换，如：163.com.cn 就要转换成http://163.com.cn
http://192.168.104.240/eipdemo/admin/main.aspx?autologin=Y 转换成http://192.168.104.240/eipdemo/

Answer 1

string CheckComplateUrl(string url)
{
        if (!url.StartsWith("http://", StringComparison.CurrentCultureIgnoreCase))
        {
                return "http://" + url;
        }
        else
        {
                return url;
        }
}

Answer 2

string str="http://www.163.com.cn":
if(str.IndexOf('WWW')>0)
{
  str=str.Replace(@"www.","");
  
}
string CheckComplateUrl(string url)
{
       string str=string.Empty;
       if(url.IndexOf('WWW')>0)
         {
            str=url.Replace(@"www.","");
            if (!url.StartsWith("http://", StringComparison.CurrentCultureIgnoreCase))
              {
                return "http://"+str;
              }
            else
              {
               return str;
              } 
         }
       else
        {
         if (!url.StartsWith("http://", StringComparison.CurrentCultureIgnoreCase))
              {
                return "http://"+url;
              }
            else
              {
               return url;
              } 
        }          
}按LZ的意思应该要把WWW这些字段过滤掉

Answer 3

string str="http://www.163.com.cn":
if(str.IndexOf('WWW')>0)
{
  str=str.Replace(@"www.","");
  
}
string CheckComplateUrl(string url)
{
       string str=string.Empty;
       if(url.IndexOf('WWW')>0)
         {
            str=url.Replace(@"www.","");
            if (!url.StartsWith("http://", StringComparison.CurrentCultureIgnoreCase))
              {
                return "http://"+str;
              }
            else
              {
               return str;
              } 
         }
       else
        {
         if (!url.StartsWith("http://", StringComparison.CurrentCultureIgnoreCase))
              {
                return "http://"+url;
              }
            else
              {
               return url;
              } 
        }          
}按LZ的意思应该要把WWW这些字段过滤掉

Answer 4

string str="http://www.163.com.cn":
if(str.IndexOf('WWW')>0)
{
  str=str.Replace(@"www.","");
  
}
string CheckComplateUrl(string url)
{
       string str=string.Empty;
       if(url.IndexOf('WWW')>0)
         {
            str=url.Replace(@"www.","");
            if (!url.StartsWith("http://", StringComparison.CurrentCultureIgnoreCase))
              {
                return "http://"+str;
              }
            else
              {
               return str;
              } 
         }
       else
        {
         if (!url.StartsWith("http://", StringComparison.CurrentCultureIgnoreCase))
              {
                return "http://"+url;
              }
            else
              {
               return url;
              } 
        }          
}按LZ的意思应该要把WWW这些字段过滤掉