正则表达式

  <script type="text/javascript">
        function ok(){
            if(document.getElementById("txtName").value=="")
            {
                alert("用户名不能为空");
                return false;   
            }
            if(document.getElementById("txtEmail").value=="")
            {
                alert("邮箱不能为空");
                return false;   
            }
            var dname=document.getElementById("txtName").value;
            var demail=document.getElementById("txtEmail").value;
            var mobel=document.getElementById("txtPass").value;
            var remobel= /^((\(\d{2,3}\))|(\d{3}\-))?(\(0\d{2,3}\)|0\d{2,3}-)?[1-9]\d{6,7}(\-\d{1,4})?$/;
            var rename=/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/;
            if(dname.length<6)
            {
                alert("长度不能小于6位");
                return false;
            }if(!rename.test(demail))
            {
                alert("输入邮箱有误");
                return false;
            }
            if(!remobel.test(mobel))
            {
                alert("输入的电话有误");
                  return false;
            }
        }
    </script>