function IsURL (str_url) { 
var strRegex = '^((https|http|ftp|rtsp|mms)"htmlcode">

function CheckUrl(str) { 
var RegUrl = new RegExp(); 
RegUrl.compile("^[A-Za-z]+://[A-Za-z0-9-_]+\\.[A-Za-z0-9-_%&\");//jihua.cnblogs.com 
if (!RegUrl.test(str)) { 
return false; 
} 
return true; 
} 



代码三：


function checkUrl(urlString){
if(urlString!=""){
var reg=/(http|ftp|https):\/\/[\w\-_]+(\.[\w\-_]+)+([\w\-\.,@"不是正确的网址吧，请注意检查一下");
						}
					}
}


下面给大家分享一个常用的验证网址的正则表达式


  
    
      正则表达式
      
      (http|ftp|https):\/\/[\w\-_]+(\.[\w\-_]+)+([\w\-\.,@"row">匹配
      http://regxlib.com/Default.aspx | http://electronics.cnet.com/electronics/0-6342366-8-8994967-1.html
    
    
      不匹配
      www.yahoo.com
    
  




  
    
      正则表达式
      
      ^\\{2}[\w-]+\\(([\w-][\w-\s]*[\w-]+[$$]"row">匹配
      \\server\service | \\server\my service | \\serv_001\service$
    
    
      不匹配
      \\my server\service | \\server\ service | \\server$\service
    
  




  
    
      正则表达式
      
      ^(http|https|ftp)\://([a-zA-Z0-9\.\-]+(\:[a-zA-Z0-9\.&%\$\-]+)*@)"row">匹配
      http://www.sysrage.net | https://64.81.85.161/site/file.php"row">不匹配
      sysrage.net
    
  




  
    
      正则表达式
      
      ^([a-zA-Z]\:|\\\\[^\/\\:*"<>|]+\\[^\/\\:*"<>|]+)(\\[^\/\\:*"<>|]+)+(\.[^\/\\:*"<>|]+)$
      
    
    
      匹配
      c:\Test.txt | \\server\shared\Test.txt | \\server\shared\Test.t
    
    
      不匹配
      c:\Test | \\server\shared | \\server\shared\Test."jbborder">
  
    
      正则表达式
      
      ^(http|https|ftp)\://([a-zA-Z0-9\.\-]+(\:[a-zA-Z0-9\.&amp;%\$\-]+)*@)*((25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9])\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[0-9])|localhost|([a-zA-Z0-9\-]+\.)*[a-zA-Z0-9\-]+\.(com|edu|gov|int|mil|net|org|biz|arpa|info|name|pro|aero|coop|museum|[a-zA-Z]{2}))(\:[0-9]+)*(/($|[a-zA-Z0-9\.\,\"row">匹配
      http://site.com/dir/file.php"row">不匹配
      site.com | http://site.com/dir//
    
  




  
    
      正则表达式
      
      ^([a-zA-Z]\:)(\\[^\\/:*"|]*("row">匹配
      C:\di___r\fi_sysle.txt | c:\dir\filename.txt
    
    
      不匹配
      c:\dir\file"jbborder">
  
    
      正则表达式
      
      ^([a-zA-Z0-9]([a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])"row">匹配
      regexlib.com | this.is.a.museum | 3com.com
    
    
      不匹配
      notadomain-.com | helloworld.c | .oops.org
    
  




  
    
      正则表达式
      
      ^(((ht|f)tp(s"row">匹配
      www.blah.com:8103 | www.blah.com/blah.asp"row">不匹配
      www.state.ga | http://www.jb51.ru
    
  




  
    
      正则表达式
      
      \b(([\w-]+://"row">匹配
      http://jb51.net/blah_blah | http://jb51.net/blah_blah/ | (Something like http://jb51.net/blah_blah) | http://jb51.net/blah_blah_(wikipedia) | (Something like http://jb51.net/blah_blah_(wikipedia)) | http://jb51.net/blah_blah. |http://jb51.net/blah_blah/. | <http://jb51.net/blah_blah> | <http://jb51.net/blah_blah/>| http://jb51.net/blah_blah, | http://www.example.com/wpstyle/"row">不匹配
      no_ws.example.com | no_proto_or_ws.com | /relative_resource.php