正则表达式检查IP和EMAIL字符串的格式（Javascript实现）

2022-07-15 80酷酷网 80kuku.com

　　javascript|正则|字符串

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