用正则表达式搭配JS判断邮件/邮箱地址格式

javascript

用正则表达式判断Email的格式是否正确：

<scriptlanguage=javascript>

function checkEmail(el)//用正则表达式判断

{

varregu ="^(([0-9a-zA-Z]+)|([0-9a-zA-Z]+[_.0-9a-zA-Z-]*[0-9a-zA-Z-]+))@([a-zA-Z0-9-]+[.])+([a-zA-Z]|net|NET|asia|ASIA|com|COM|gov|GOV|mil|MIL|org|ORG|edu|EDU|int|INT|cn|CN|cc|CC)$"

varre = new RegExp(regu);

if(el.search(re) == -1)

{

returntrue; //非法

}

returnfalse;//正确

}

functionchecklogin()

{

var obj =document.getElementById(’emailid’);

if(checkEmail(obj.value))

{

alert("E-mail格式不正确，请检查!");

obj.focus();

returnfalse;

}

}

</script>

<formname="myform" action="" onSubmit="returnchecklogin();" method="post">

Email:

<inputname="email" id="emailid" type="text"size="25" />

<input name="submit"type="submit" value="登陆"/></form>

用JS判断Email格式是否符合要求：

<scriptlanguage="javascript">

function checkemail()

{

if(document.myform.email.value.charAt(0)=="." ||document.myform.email.value.charAt(0)=="@"||document.myform.email.value.indexOf(’@’, 0) == -1 ||document.myform.email.value.indexOf(’.’, 0) == -1 ||document.myform.email.value.lastIndexOf("@")==document.myform.email.value.length-1||document.myform.email.value.lastIndexOf(".")==document.myform.email.value.length-1)

{

alert("Email的格式不正确！");

document.myform.email.focus();

returnfalse;

}

return true;

}

</script>

<formname="myform" action="" onSubmit="returncheckemail();" method="post">

Email:

<inputname="email" id="emailid" type="text"size="25" />

<input name="submit"type="submit" value="登陆"/></form>

Java

publicclassCheckEmail
{

publicstaticbooleancheckEmail(String
email){

//验证邮箱的正则表达式

Stringformat = "\\p{Alpha}\\w{2,15}[@][a-z0-9]{3,}[.]\\p{Lower}{2,}";

if(email.matches(format)){

returntrue;
//邮箱名合法，返回true

}else{

returnfalse;
// 邮箱名不合法，返回false

}

}

publicstaticvoidmain(String[]
args) {

Stringemail = "cc**365@163.com"; //需要进行验证的邮箱

if(CheckEmail.checkEmail(email)){
// 验证邮箱

System.out.println(email+"\n是合法的邮箱名。");

}else{

System.out.println(email+"\n不是合法的邮箱名。");

}

}

}