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function.js
//check the format of IP address
//Write by Ken
function checkIP(ip)
{
var re = /^((\d)|(([1-9])\d)|(1\d\d)|(2(([0-4]\d)|5([0-5]))))\.((\d)|(([1-9])\d)|(1\d\d)|(2(([0-4]\d)|5([0-5]))))\.((\d)|(([1-9])\d)|(1\d\d)|(2(([0-4]\d)|5([0-5]))))\.((\d)|(([1-9])\d)|(1\d\d)|(2(([0-4]\d)|5([0-5]))))$/;
if(re.test(ip))
return true;
else
return false;
}
//check the format of email
//Write by Ken
//Note:
//Begining by number or leter.
function checkEmail(email)
{
var re = /^((\d|[a-z]|[A-Z])(((\d|[a-z]|[A-Z]|\_){1,19})))@((((\d|[a-z]|[A-Z]){1,10})\.){1,4})(((\d|[a-z]|[A-Z])){2,10})$/;
//var re = /^((\d|[a-z]|[A-Z])|(((\d|[a-z]|[A-Z]){1,19})))@((((\d|[a-z]|[A-Z])\.){1, 4})(((\d|[a-z]|[A-Z])){2, 10}))$/;
if(re.test(email))
return true;
else
return false;
}
function onIPClick()
{
if(checkIP(form1.ip.value))
alert('true');
else
alert('false');
}
function onEmailClick()
{
if(checkEmail(form1.email.value))
alert('true');
else
alert('false');
}
test.html
<html>
<head>
<script language='javascript' src='function.js'>
</script>
</head>
<body>
<form name='form1'>
<span>
<input type='text' id='ip' name='ip' value='127.0.0.1'></input>
<input type='button' value='IP' ></input>
</span>
</form>
</body>
</html>
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