jsp 正则表达式，我想把代码写成如果不为空就验证邮箱格式是否正确

function valiEmail(emailObj){
    emailObj.className='';
    var spanObj = document.getElementById('email_msg');
    spanObj.innerHTML='';
    var reg = /^[a-zA-Z0-9]{5,15}@[a-zA-Z0-9]{2,10}[.](com|net)$/;
    if(!reg.test(emailObj.value)){
     spanObj.innerHTML='email格式不正确';
     emailObj.className='s2';
     return false;
    }
    return true;
   }
	           

答案：function valiEmail(emailObj){
    emailObj.className='';
    var spanObj = document.getElementById('email_msg');
    spanObj.innerHTML='';
    var reg = /^[a-zA-Z0-9]{5,15}@[a-zA-Z0-9]{2,10}[.](com|net)$/;
    emailObj.value=emailObj.value.replace(/(^\s*)|(\s*$)/g, "");
    if(emailObj.value.length == 0)
    {
       spanObj.innerHTML='请输入email';
       emailObj.className='s2';
       return false;
    }
    if(!reg.test(emailObj.value)){
     spanObj.innerHTML='email格式不正确';
     emailObj.className='s2';
     return false;
    }
    return true;
   }

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