Use regular expression to validate url : Regular Expressions « Development « JavaScript DHTML

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JavaScript DHTML » Development » Regular Expressions 
Use regular expression to validate url
   

<HTML>
<HEAD>
<SCRIPT language="JavaScript">
function check_it()
{
 var theurl=document.f1.t1.value;
 var tomatch= /http:\/\/[A-Za-z0-9\.-]{3,}\.[A-Za-z]{3}/
 if (tomatch.test(theurl)){
     document.write("valid");
     return true;
 }else{
     document.write("invalid");
     return false
 }
}
</SCRIPT>
</HEAD>
<BODY>
<FORM name="f1" action="#" onSubmit="return check_it();">
URL:<INPUT type="text" name="t1">
    <INPUT type="submit" value="Submit">
</BODY>
</HTML>

   
    
    
  
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