用Javascript正则表达式验证Email地址

 function isValidMail(sText) {
2  var reMail = /^(?:[a-z\d]+[_\-\+\.]?)*[a-z\d]+@(?:([a-z\d]+\-?)*[a-z\d]+\.)+([a-z]{2,})+$/i;
3  alert(reMail.test(sText))
4 }
5