js判断email合法性

//检测email合法性
function checkemail(email){
    var pattern = /^([a-zA-Z0-9]+[_|\_|\.]?)*[a-zA-Z0-9]+@([a-zA-Z0-9]+[_|\_|\.]?)*[a-zA-Z0-9]+\.[a-zA-Z]{2,3}$/;
    if(pattern.test(email)){
        return true;
    }else{
        return false;
    }
}