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>

1.	Searching and Replacing Substrings
2.	Regular Expression Tester
3.	The Regular Expression Tester
4.	Regular Expression Match Workshop
5.	Regular Expressions: Looking for a Match
6.	Regular Expressions: Extracting Data from a Match
7.	Regular Expressions: Replacing Strings via Regular Expressions
8.	check Date format
9.	Split comma number string
10.	String match pattern: (.*)
11.	Whether a string is a valid phone number
12.	String replace with regular expression
13.	Finding a substring within a string
14.	Whether a string contains only numerical data
15.	Validate an email
16.	Using regular expressions to validate an email
17.	Using regular expression (callback function)
18.	Split a string array and get token
19.	Trim a string with regular expression from both sides
20.	The Backslash in RegExp
21.	Regular Expression Switch
22.	Try your regular expression here

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

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