<html> <head>
</head> <script language="javascript">
function isURL(s) {
var regexp = /http:\/\/[A-Za-z0-9\.-]{3,}\.[A-Za-z]{3}/;
alert(regexp.test(s));
}
</script>
<body> <form>
<input type="text" name="url" size="20" id="url"/>
<input type="button" value="Validate" onClick="javascript:isURL(document.getElementById('url').value);"/>
</form> </body></html>
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