正则验证手机号码

function Checkreg()
{
//验证电话号码手机号码，包含153，159号段
     if (document.form.phone.value=="" && document.form.UserMobile.value==""){
         alert("电话号码和手机号码至少选填一个阿！");
         document.form.phone.focus();
         return false;
         }
     if (document.form.phone.value != ""){
         var phone=document.form.phone.value;
         var p1 = /^(([0\+]\d{2,3}-)?(0\d{2,3})-)?(\d{7,8})(-(\d{3,}))?$/;
         var me = false;
         if (p1.test(phone))me=true;
         if (!me){
             document.form.phone.value='';
             alert('对不起，您输入的电话号码有错误。区号和电话号码之间请用-分割');
             document.form.phone.focus();
             return false;
         }
     }
     if (document.form.UserMobile.value != ""){
         var mobile=document.form.UserMobile.value;
         var reg0 = /^13\d{5,9}$/;
         var reg1 = /^153\d{4,8}$/;
         var reg2 = /^159\d{4,8}$/;
         var reg3 = /^0\d{10,11}$/;
         var my = false;
         if (reg0.test(mobile))my=true;
         if (reg1.test(mobile))my=true;
         if (reg2.test(mobile))my=true;