Use JavaScript Regular expressions to verify that the URL format is correct __ regular expressions

Using JavaScript Regular expressions to verify the URL format is correct, a lot of ways, this is only a way to achieve.
The code is as follows:

<script type= "Text/javascript" > function Isurl (str) { var regurl =/(http\:\/\/)? [\w.] +) (\/[\w-\.\/\?%&=]*)/gi; var result = Str.match (Regurl); if (result!=null) {alert ("Yes")} else {alert ("no!") }} </script> <script type= "text/javascript" > function Isurl (str) { var regurl =/(http\:\/\/)? [\w.] +) (\/[\w-\.\/\?%&=]*)/gi; var result = Str.match (Regurl); if (result!=null) {alert ("Yes")} Else{alert ("no!") }} </script>

Call Method:

<form name= "Bao" > <input type= "text" name= "TXT" > <input type=button value= "Testurl" oncli ck= "Isurl (document.bao.txt.value)" > </FORM>

Explain:
(http\:\/\/)? Represents a match http://0 or 1 times,
([\w.] +) Matching www.sian.com
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<script>
    	function Checkadd () {
    		var websitename=$ ("#websiteName"). Val () | | "";
    		var url=$ ("#url"). Val () | | ""; 
    		if (websitename== "") {
    			alert ("Please enter URL name");
    			return false;
    		}  
    		var reg=/^ ([hh][tt]{2}[pp]:\/\/|[ hh][tt]{2}[pp][ss]:\/\/) (([a-za-z0-9-~]+) \.) + ([a-za-z0-9-~\/]) +$/; 
    		if (url== "") {
    			alert ("Please enter URL");
    			return false;
    		}  
    		if (!reg.test (URL)) { 
    		 	alert ("Incorrect URL format");
    		 	return false;
    		}
    		 
    	}
    </script>

Call

<s:submit value= "Add" onclick= "return Checkadd ()" ></s:submit>

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Another one:

http://blog.csdn.net/vipxiaotian/article/details/1774686

////////////////////////////////////////////////////////////////////

function Checkurl (str) {
    var regurl = new RegExp ();
    Regurl.compile ("^[a-za-z]+://[a-za-z0-9-_]+\\.[ a-za-z0-9-_%&\?\/.=]+$ ");
    if (! Regurl.test (str)) {return
        false;
    }
    return true;
}

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More stringent testing methods

Http://www.phpernote.com/javascript-function/337.html